Official Paper

RRB JE CBT-2 2024 (CMA) Official Paper (Held On: 22 Apr, 2025 Shift 1) (Previous Year Paper)

150 questions · 120 minutes · with answers · free

Attempt as Timed Mock Test

General Abilities (50 questions)

1

Which of the following CANNOT be considered as a measure to control global warming?

  1. ((a))

    Efficiently using energy

  2. ((b))

    Cutting down use of fossil fuel

  3. ((c))

    Reduction in emission of greenhouse gases

  4. ((d))

    Causing deforestation

Show Answer
Answer: ((a))

Efficiently using energy

2

What is the maximum number of Ministers allowed in the Council of Ministers, including the Prime Minister, as per the 91st Amendment Act?

  1. ((a))

    12% of Lok Sabha strength

  2. ((b))

    10% of Lok Sabha strength

  3. ((c))

    15% of Lok Sabha strength

  4. ((d))

    20% of Lok Sabha strength

Show Answer
Answer: ((a))

12% of Lok Sabha strength

3

What is the net force acting on an object if balanced forces are applied?

  1. ((a))

    Equal to the mass of the object

  2. ((b))

    Zero

  3. ((c))

    Equal to acceleration

  4. ((d))

    Infinite

Show Answer
Answer: ((a))

Equal to the mass of the object

4

Which of the following is NOT a source of release of smokestacks?

  1. ((a))

    Rivers

  2. ((b))

    Smelters

  3. ((c))

    Thermal power plants

  4. ((d))

    Industries

Show Answer
Answer: ((a))

Rivers

5

What is the primary purpose of using a firewall on a Personal Computer?

  1. ((a))

    To increase storage space

  2. ((b))

    To block unauthorised access and protect the computer

  3. ((c))

    To clean up temporary files

  4. ((d))

    To speed up internet connectivity

Show Answer
Answer: ((a))

To increase storage space

6

The energy that is derived from the use of radioactive isotopes is termed as _________.

  1. ((a))

    thermal energy

  2. ((b))

    solar energy

  3. ((c))

    geothermal energy

  4. ((d))

    nuclear energy

Show Answer
Answer: ((a))

thermal energy

7

The fine powder that is obtained from the modified and recycled form of plastic is called

_______.

  1. ((a))

    polyblend

  2. ((b))

    polystyrene

  3. ((c))

    polyethylene

  4. ((d))

    polythene

Show Answer
Answer: ((a))

polyblend

8

Which of the following is NOT toxic to non-target organisms in the soil?

  1. ((a))

    Organic fertilisers

  2. ((b))

    Pesticides

  3. ((c))

    Herbicides

  4. ((d))

    Fungicides

Show Answer
Answer: ((a))

Organic fertilisers

9

What does PCB stand for?

  1. ((a))

    Processing Circuit Board

  2. ((b))

    Peripheral Connection Bus

  3. ((c))

    Primary Control Board

  4. ((d))

    Printed Circuit Board

Show Answer
Answer: ((a))

Processing Circuit Board

10

Which of the following is NOT a component of a CPU?

  1. ((a))

    Arithmetic Logic Unit (ALU)

  2. ((b))

    Hard Disk

  3. ((c))

    Cache Memory

  4. ((d))

    Control Unit (CU)

Show Answer
Answer: ((a))

Arithmetic Logic Unit (ALU)

11

In which of the following regions the Himalayas has the greatest width?

  1. ((a))

    Sikkim

  2. ((b))

    Kashmir

  3. ((c))

    Himachal Pradesh

  4. ((d))

    Arunachal Pradesh

Show Answer
Answer: ((a))

Sikkim

12

Which official in the Gupta administration was responsible for peace and war matters?

  1. ((a))

    Vishayapati

  2. ((b))

    Sandhi-Vigrahika

  3. ((c))

    Mahapratihara

  4. ((d))

    Mahadandanayaka

Show Answer
Answer: ((a))

Vishayapati

13

Which of the following is a characteristic difference between colloids and true solutions?

  1. ((a))

    True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

  2. ((b))

    True solutions have a single-phase system, whereas colloids have a two phase system.

  3. ((c))

    True solutions exhibit Brownian motion, but colloids do not.

  4. ((d))

    True solutions show the Tyndall effect, but colloids do not.

Show Answer
Answer: ((a))

True solutions have visible solute particles, whereas colloids have invisible dispersed particles.

14

Which of the following cities hosted the inaugural Kho Kho World Cup in January 2025?

  1. ((a))

    Chennai

  2. ((b))

    New Delhi

  3. ((c))

    Mumbai

  4. ((d))

    Kolkata

Show Answer
Answer: ((a))

Chennai

15

The primary agent that helps in the decomposition of biodegradable matter in domestic sewage is __________.

  1. ((a))

    chloride

  2. ((b))

    nitrate

  3. ((c))

    bacterium

  4. ((d))

    phosphate

Show Answer
Answer: ((a))

chloride

16

What is the first step to securing ones smartphone or tablet?

  1. ((a))

    Setting a password/PIN-protected lock screen

  2. ((b))

    Turning off mobile data

  3. ((c))

    Using only free Wi-Fi networks

  4. ((d))

    Installing more apps

Show Answer
Answer: ((a))

Setting a password/PIN-protected lock screen

17

What is the approximate pH of a neutral salt solution?

  1. ((a))

    Less than 7

  2. ((b))

    Depends on the temperature

  3. ((c))

    More than 7

  4. ((d))

    Equal to 7

Show Answer
Answer: ((a))

Less than 7

18

Why does a bee sting cause pain and irritation?

  1. ((a))

    The sting releases carbon dioxide gas.

  2. ((b))

    The sting injects a mild sugar solution.

  3. ((c))

    The sting injects methanoic acid.

  4. ((d))

    The sting contains a strong base.

Show Answer
Answer: ((a))

The sting releases carbon dioxide gas.

19

If you want the primary recipient to see that others have received a copy of an email, you should enter their email addresses in the ______ field.

  1. ((a))

    Bcc

  2. ((b))

    Cc

  3. ((c))

    Subject

  4. ((d))

    To

Show Answer
Answer: ((a))

Bcc

20

What is the purpose of the Collation option in the Print settings?

  1. ((a))

    To print all the pages of a document as a set

  2. ((b))

    To select a custom print range

  3. ((c))

    To adjust the page orientation

  4. ((d))

    To change the printer selection

Show Answer
Answer: ((a))

To print all the pages of a document as a set

21

The Rudra Veena is predominantly associated with which genre of Hindustani music?

  1. ((a))

    Thumri

  2. ((b))

    Dhrupad

  3. ((c))

    Khayal

  4. ((d))

    Ghazal

Show Answer
Answer: ((a))

Thumri

22

Which of the following correctly represents the chemical formula of a compound formed by aluminium and sulphate ions?

  1. ((a))

    Al(SO4)3

  2. ((b))

    Al2SO4

  3. ((c))

    Al2(SO4)3

  4. ((d))

    Al3(SO4)2

Show Answer
Answer: ((a))

Al(SO4)3

23

Which of the following states is NOT covered under the Atal Bhujal Yojana?

  1. ((a))

    Maharashtra

  2. ((b))

    Rajasthan

  3. ((c))

    Jharkhand

  4. ((d))

    Uttar Pradesh

Show Answer
Answer: ((a))

Maharashtra

24

The phenomenon of multiple echoes due to repeated reflections is called ___________.

  1. ((a))

    resonance

  2. ((b))

    refraction

  3. ((c))

    diffraction

  4. ((d))

    reverberation

Show Answer
Answer: ((a))

resonance

25

If the absolute refractive index of a medium is less than 1, it means ________.

  1. ((a))

    light travels faster in that medium than in vacuum

  2. ((b))

    the medium is a perfect reflector

  3. ((c))

    the medium absorbs all light

  4. ((d))

    light travels slower in that medium than in vacuum

Show Answer
Answer: ((a))

light travels faster in that medium than in vacuum

26

The Millennium Development Goals (MDGs) aimed to reduce extreme poverty by which year?

  1. ((a))

    2008

  2. ((b))

    2015

  3. ((c))

    2005

  4. ((d))

    2014

Show Answer
Answer: ((a))

2008

27

Which defect of vision occurs due to the weakening of ciliary muscles with age?

  1. ((a))

    Astigmatism

  2. ((b))

    Hypermetropia

  3. ((c))

    Myopia

  4. ((d))

    Presbyopia

Show Answer
Answer: ((a))

Astigmatism

28

Which state of matter shows the highest expansion when temperature is increased?

  1. ((a))

    Solids

  2. ((b))

    Gases

  3. ((c))

    Liquids

  4. ((d))

    Plasma

Show Answer
Answer: ((a))

Solids

29

What is the primary function of the F4 key in MS Excel when editing a cell reference in a formula?

  1. ((a))

    Opens the Find and Replace dialog

  2. ((b))

    Toggles between absolute and relative references

  3. ((c))

    Repeats the last action

  4. ((d))

    Refreshes the worksheet

Show Answer
Answer: ((a))

Opens the Find and Replace dialog

30

The main use of chlorofluorocarbons is in __________.

  1. ((a))

    smog

  2. ((b))

    chimneys

  3. ((c))

    refrigerants

  4. ((d))

    vehicles

Show Answer
Answer: ((a))

smog

31

Which of the following is the correct way to insert a new column in a spreadsheet?

  1. ((a))

    Go to Home > Insert > Insert Sheet Columns.

  2. ((b))

    Go to File > New > Column.

  3. ((c))

    Use Ctrl + Z to insert a column.

  4. ((d))

    Press Ctrl + X and then Insert.

Show Answer
Answer: ((a))

Go to Home > Insert > Insert Sheet Columns.

32

What is the shortcut key to start a slideshow from the beginning?

  1. ((a))

    F5

  2. ((b))

    Alt + Tab

  3. ((c))

    Shift + F5

  4. ((d))

    Ctrl + P

Show Answer
Answer: ((a))

F5

33

Which of the following companies announced plans in February 2025 to construct the world's longest undersea cable, aiming to enhance internet connectivity across five continents, with landing points in India?

  1. ((a))

    Amazon

  2. ((b))

    Meta

  3. ((c))

    Microsoft

  4. ((d))

    Google

Show Answer
Answer: ((a))

Amazon

34

What is India's global military ranking in the 2025 Global Firepower (GFP) index?

  1. ((a))

    5th

  2. ((b))

    2nd

  3. ((c))

    4th

  4. ((d))

    3rd

Show Answer
Answer: ((a))

5th

35

What happens when an acid reacts with a metal oxide?

  1. ((a))

    Only salt is formed.

  2. ((b))

    A salt and hydrogen gas are formed.

  3. ((c))

    A salt and water are formed.

  4. ((d))

    Only water is formed.

Show Answer
Answer: ((a))

Only salt is formed.

36

Dr. BR Ambedkar described which part of the Indian Constitution as its ‘novel features', while Granville Austin referred to it as the ‘Conscience of the Constitution’?

  1. ((a))

    Directive Principles of State Policy

  2. ((b))

    Fundamental Rights

  3. ((c))

    Preamble

  4. ((d))

    Fundamental Duties

Show Answer
Answer: ((a))

Directive Principles of State Policy

37

If an object is dropped from rest, what will be its velocity after 15 seconds? (g = 9.8 m/s2)

  1. ((a))

    143 m/s

  2. ((b))

    149 m/s

  3. ((c))

    145 m/s

  4. ((d))

    147 m/s

Show Answer
Answer: ((a))

143 m/s

38

What happens when a computer is put into Sleep mode?

  1. ((a))

    It shuts down completely.

  2. ((b))

    It stores data on the hard drive and powers off.

  3. ((c))

    It restarts automatically after a few minutes.

  4. ((d))

    It keeps the session active in RAM while using minimal power.

Show Answer
Answer: ((a))

It shuts down completely.

39

The glass panel used in greenhouses is known to retain ________.

  1. ((a))

    humidity

  2. ((b))

    heat

  3. ((c))

    pH

  4. ((d))

    rainfall

Show Answer
Answer: ((a))

humidity

40

Inertia depends on which property of an object?

  1. ((a))

    Shape

  2. ((b))

    Acceleration

  3. ((c))

    Velocity

  4. ((d))

    Mass

Show Answer
Answer: ((a))

Shape

41

The practice of Jhum cultivation is prevalent in the __________.

  1. ((a))

    South west

  2. ((b))

    North west

  3. ((c))

    North east

  4. ((d))

    South east

Show Answer
Answer: ((a))

South west

42

Which of the following correctly explains why clothes dry faster on a windy day?

  1. ((a))

    Wind decreases the temperature of the water molecules.

  2. ((b))

    Wind removes the water vapour from the clothes’ surroundings.

  3. ((c))

    Wind increases the humidity around the clothes.

  4. ((d))

    Wind reduces the surface area of the clothes.

Show Answer
Answer: ((a))

Wind decreases the temperature of the water molecules.

43

The maximum sound is generated _________.

  1. ((a))

    from vehicular emissions

  2. ((b))

    from house chimneys

  3. ((c))

    from industrial smoke

  4. ((d))

    by the take off of a jet plane

Show Answer
Answer: ((a))

from vehicular emissions

44

Identify the correct formula for the compound formed between Mg2+ and PO43− ions.

  1. ((a))

    Mg(PO4)3

  2. ((b))

    Mg3(PO4)2

  3. ((c))

    Mg2(PO4)3

  4. ((d))

    MgPO4

Show Answer
Answer: ((a))

Mg(PO4)3

45

What was the main objective of the Extremists during the Indian National Movement?

  1. ((a))

    To attain complete independence (Swaraj)

  2. ((b))

    To promote British goods in India

  3. ((c))

    To expand the legislative councils

  4. ((d))

    To bring social reforms

Show Answer
Answer: ((a))

To attain complete independence (Swaraj)

46

According to the Tendulkar methodology, what was the estimated percentage of people below the poverty line in rural areas in 2011-12?

  1. ((a))

    27.5%

  2. ((b))

    20%

  3. ((c))

    25.7%

  4. ((d))

    15.5%

Show Answer
Answer: ((a))

27.5%

47

The Industrial Policy Resolution of 1956 categorised industries into how many groups?

  1. ((a))

    Five

  2. ((b))

    Three

  3. ((c))

    Nine

  4. ((d))

    Seven

Show Answer
Answer: ((a))

Five

48

Which Article provides Ministers the right to participate in parliamentary proceedings but without voting rights?

  1. ((a))

    Article 88

  2. ((b))

    Article 78

  3. ((c))

    Article 53

  4. ((d))

    Article 77

Show Answer
Answer: ((a))

Article 88

49

In an electric circuit, what is the correct way to connect an ammeter?

  1. ((a))

    In either series or parallel

  2. ((b))

    In parallel with the component

  3. ((c))

    In series with the component

  4. ((d))

    In parallel with the source

Show Answer
Answer: ((a))

In either series or parallel

50

Who among the following inaugurated the 38th National Games held in Dehradun in January 2025?

  1. ((a))

    Narendra Modi

  2. ((b))

    Pushkar Singh Dhami

  3. ((c))

    Anurag Thakur

  4. ((d))

    Droupadi Murmu

Show Answer
Answer: ((a))

Narendra Modi

Technical Abilities (100 questions)

51

What is a significant environmental concern associated with using non-renewable energy sources?

  1. ((a))

    Water scarcity

  2. ((b))

    Habitat destruction

  3. ((c))

    Greenhouse gas emissions

  4. ((d))

    Overpopulation

Show Answer
Answer: ((a))

Water scarcity

52

Which of the following is a common industrial method for preparing ammonium nitrate?

  1. ((a))

    Haber-Bosch process

  2. ((b))

    Electrolysis of ammonium salts

  3. ((c))

    Metathesis reaction

  4. ((d))

    Neutralisation of ammonia with nitric acid

Show Answer
Answer: ((a))

Haber-Bosch process

53

Which of the following is an INCORRECT statement about hard water?

  1. ((a))

    Hard water contains dissolved calcium and magnesium salts

  2. ((b))

     Hard water lowers the boiling point of water

  3. ((c))

    Hard water does not lather well with soap and forms white scum

  4. ((d))

    Hard water decreases the cleansing ability of soap

Show Answer
Answer: ((a))

Hard water contains dissolved calcium and magnesium salts

54

Which of the following queries will correctly retrieve the name of Professor from Professor table with ID 101, 102 or 104?

  1. ((a))

    SELECT NAME FROM Professor WHERE id CONTAINS (101, 102, 103);

  2. ((b))

    SELECT NAME FROM Professor WHERE id BETWEEN 101 AND 103;

  3. ((c))

    SELECT NAME FROM Professor WHERE id IN (101, 102, 104);

  4. ((d))

    SELECT NAME FROM Professor WHERE id = (101, 102, 103);

Show Answer
Answer: ((a))

SELECT NAME FROM Professor WHERE id CONTAINS (101, 102, 103);

55

Which of the following types of coke ovens are heated from outside and the heat required for carbonisation is transmitted through the side walls?

  1. ((a))

    Beehive ovens

  2. ((b))

    Flatter and wider ovens

  3. ((c))

    Non recovery ovens

  4. ((d))

    Slot type by-product recovery ovens

Show Answer
Answer: ((a))

Beehive ovens

56

What is the primary use of gasoline as a petroleum product?

  1. ((a))

    Manufacturing plastics

  2. ((b))

    Lubricating machinery

  3. ((c))

    Heating homes

  4. ((d))

    Powering internal combustion engines

Show Answer
Answer: ((a))

Manufacturing plastics

57

What is the primary combustible component of producer gas?

  1. ((a))

    Nitrogen

  2. ((b))

    Carbon monoxide

  3. ((c))

    Hydrogen

  4. ((d))

    Carbon dioxide

Show Answer
Answer: ((a))

Nitrogen

58

Arrange the following materials in descending order, as per the value of their thermal conductivity.

  1. Pure iron

  2. Liquid water

  3. Steam

  4. Pure Brass

  1. ((a))

    4-3-2-1

  2. ((b))

    4-1-2-3

  3. ((c))

    2-3-1-4

  4. ((d))

    1-2-3-4

Show Answer
Answer: ((a))

4-3-2-1

59

Which of the following factors favours high thermal stability of coke in the blast furnace?

  1. ((a))

    High chemical reactivity

  2. ((b))

    Absence of large lumps in feed coke

  3. ((c))

    Low carbonisation temperature

  4. ((d))

    Maximum inert inclusions of large sizes

Show Answer
Answer: ((a))

High chemical reactivity

60

What will be the output of the following C code?

#include <stdio.h>

void main()

{

int x = 10 v = 20

printf("%d",!(x < y) ? ++x : y);

}

  1. ((a))

    20

  2. ((b))

    10

  3. ((c))

     30

  4. ((d))

    11

Show Answer
Answer: ((a))

20

61

Which of the following ceramics has a two-layer silicate sheet structure?

  1. ((a))

    Silica glass

  2. ((b))

    Kaolinite clay

  3. ((c))

    Silica

  4. ((d))

    Fullerene

Show Answer
Answer: ((a))

Silica glass

62

Which of the following is the chemical name of natural rubber?

  1. ((a))

    Chloroprene

  2. ((b))

    Acrylonitrile-butadiene copolymer

  3. ((c))

    Styrene-butadiene copolymer

  4. ((d))

    Polyisoprene

Show Answer
Answer: ((a))

Chloroprene

63

Select the correct pair related to types of doors and their features.

  1. ((a))

    Collapsible door - Made of PVC panels

  2. ((b))

    Revolving door - Made of shutter slide on sides with help of runners and guided rails

  3. ((c))

    Battened and ledged door - Made of vertical bond and horizontal supports

  4. ((d))

    Flush door - Made of single wood plank

Show Answer
Answer: ((a))

Collapsible door - Made of PVC panels

64

The mass density of water is in the standard conditions.

  1. ((a))

    1000 kg/m³

  2. ((b))

    10 kg/m³

  3. ((c))

    1 kg/m³

  4. ((d))

    100 kg/m³

Show Answer
Answer: ((a))

1000 kg/m³

65

Which of the following options correctly identifies Data Control Language (DCL) commands in SQL Query?

  1. ((a))

    CREATE, DROP

  2. ((b))

    GRANT, REVOKE

  3. ((c))

    SELECT, INSERT

  4. ((d))

    UPDATE, DELETE

Show Answer
Answer: ((a))

CREATE, DROP

66

A surveyor is conducting a compass survey between two stations, A and B. The observed fore bearing (FB) of line AB is 124°30'. Determine the back bearing (BB) of line BA, considering there is no local attraction.

  1. ((a))

    94°30'

  2. ((b))

    234°30'

  3. ((c))

    214°30'

  4. ((d))

    304°30

Show Answer
Answer: ((a))

94°30'

67

What is the primary component of LPG (liquefied petroleum gas)?

  1. ((a))

    Methane

  2. ((b))

    Carbon dioxide

  3. ((c))

    Nitrogen

  4. ((d))

    Propane

Show Answer
Answer: ((a))

Methane

68

Which of the following is an example of a web hosting control panel?

  1. ((a))

    Apache

  2. ((b))

    cPanel

  3. ((c))

    MySQL

  4. ((d))

     PHP

Show Answer
Answer: ((a))

Apache

69

Which of the following is NOT a part of the gating system?

  1. ((a))

     Runner

  2. ((b))

    Gate

  3. ((c))

    Core

  4. ((d))

    Sprue

Show Answer
Answer: ((a))

 Runner

70

In which application(s) is/are load cells commonly used?

  1. ((a))

    Weighing scales and industrial force measurement

  2. ((b))

    Electromagnetic wave measurement

  3. ((c))

    Temperature measurement

  4. ((d))

    Sound level detection

Show Answer
Answer: ((a))

Weighing scales and industrial force measurement

71

A BJT will operate in an active region if—— 

  1. ((a))

    an emitter base junction is reverse biased and a collector base junction is forward biased

  2. ((b))

     an emitter base junction is forward biased and a collector base junction is forward biased

  3. ((c))

    an emitter base junction is reverse biased and a collector base junction is reverse biased

  4. ((d))

    an emitter base junction is forward biased and a collector base junction is reverse biased

Show Answer
Answer: ((a))

an emitter base junction is reverse biased and a collector base junction is forward biased

72

At constant pressure, volume of expansion coefficient of a substance represents the variation of—— .

  1. ((a))

    viscosity with temperature

  2. ((b))

    density with temperature

  3. ((c))

    specific heat with volume

  4. ((d))

     thermal conductivity with volume

Show Answer
Answer: ((a))

viscosity with temperature

73

Theoretically, If Eb = V in a DC motor, the motor is likely operating at——.

  1. ((a))

     a stalled condition

  2. ((b))

    no load

  3. ((c))

    overload

  4. ((d))

     full load

Show Answer
Answer: ((a))

 a stalled condition

74

Which of the following is NOT a method of ranging used in chaining?

  1. ((a))

    Optical ranging

  2. ((b))

    Reciprocal ranging

  3. ((c))

     Indirect ranging

  4. ((d))

    Direct ranging

Show Answer
Answer: ((a))

Optical ranging

75

Which of the following characteristics is the least desirable in a building stone used for foundation construction?

  1. ((a))

    High water absorption

  2. ((b))

    Good durability

  3. ((c))

    Low porosity

  4. ((d))

    High compressive strength

Show Answer
Answer: ((a))

High water absorption

76

Which of the following is the relation between the atomic radius, r, and the lattice parameter, a, for the BCC crystal?

  1. ((a))

    r =a

  2. ((b))

     r=a22\ r = \frac{a}{2\sqrt{2}}

  3. ((c))

     r=a34\ r = \frac{a\sqrt{3}}{4}

  4. ((d))

     r=a2\ r = a\sqrt{2}

Show Answer
Answer: ((a))

r =a

77

What is a common method to reduce friction between two surfaces?

  1. ((a))

    Applying a lubricant

  2. ((b))

    Roughening the surface

  3. ((c))

    Increasing the pressure

  4. ((d))

     Increasing the surface area

Show Answer
Answer: ((a))

Applying a lubricant

78

Which of the following elements is primarily responsible for the corrosion resistance of stainless steel?

  1. ((a))

    Molybdenum

  2. ((b))

    Nickel

  3. ((c))

    Carbon

  4. ((d))

    Chromium

Show Answer
Answer: ((a))

Molybdenum

79

Which of the following types of electrical currents is commonly used in arc welding?

  1. ((a))

    Only Alternating Current (AC)

  2. ((b))

    Only static electricity

  3. ((c))

    Both AC and DC, depending on the welding process and material

  4. ((d))

    Only Direct Current (DC)

Show Answer
Answer: ((a))

Only Alternating Current (AC)

80

Which of the following operators is used to find the remainder after division?

  1. ((a))

    /

  2. ((b))
  3. ((c))
  4. ((d))

    %

Show Answer
Answer: ((a))

/

81

In a Zener diode voltage regulator circuit, what is the purpose of the series resistor (Rs) connected between the input voltage source and the Zener diode?

  1. ((a))

    To drop the excess voltage and regulate the output

  2. ((b))

     To filter out noise and ripples in the input voltage

  3. ((c))

    To limit the current through the Zener diode

  4. ((d))

    To increase the voltage rating of the Zener diode

Show Answer
Answer: ((a))

To drop the excess voltage and regulate the output

82

Which of the following is the main objective of primary wastewater treatment?

  1. ((a))

    To use biological processes to break down organic matter

  2. ((b))

    To remove all bacteria and virus from the water

  3. ((c))

    To remove floating materials and settleable solids

  4. ((d))

    To add chemicals to disinfect the water

Show Answer
Answer: ((a))

To use biological processes to break down organic matter

83

What are the two main types of junction capacitance in a PN-junction diode, based on charge storage?

  1. ((a))

    Diffusion capacitance and transition capacitance

  2. ((b))

    conduction capacitance and breakdown capacitance

  3. ((c))

    Stray capacitance and conduction capacitance

  4. ((d))

    Stay capacitance and leakage capacitance

Show Answer
Answer: ((a))

Diffusion capacitance and transition capacitance

84

The stress-strain behaviour of which of the following polymeric materials shows large recoverable strains produced at low stress levels?

  1. ((a))

    Thermosetting polymer

  2. ((b))

    Plastic polymer

  3. ((c))

    Brittle polymer

  4. ((d))

    Elastomer

Show Answer
Answer: ((a))

Thermosetting polymer

85

What will be the output of the following C code?

#include <stdio.h>

void main()

{

int x=10,result=0;

if (x > 2)

result = x + 2

printf("%d", result);

}

  1. ((a))

    1.6

  2. ((b))

    2.0

  3. ((c))

    3.13

  4. ((d))

    12

Show Answer
Answer: ((a))

1.6

86

A concave mirror is used to form an image of an object. The object distance (u) is 30 cm and the image distance (v) is 15 cm. Calculate the focal length (f) of the mirror.

  1. ((a))

    -10 cm

  2. ((b))

    -30 cm

  3. ((c))

    10 cm

  4. ((d))

    30 cm

Show Answer
Answer: ((a))

-10 cm

87

What is NOT the unit of measurement for water hardness?

  1. ((a))

    Milligrams of calcium carbonate per litre

  2. ((b))

    Parts per million

  3. ((c))

    Grams per gallon

  4. ((d))

    Grains per gallon

Show Answer
Answer: ((a))

Milligrams of calcium carbonate per litre

88

How does the limiting value of static friction depend on the area of contact?

  1. ((a))

    Independent of area

  2. ((b))

    Directly proportional to (area)2

  3. ((c))

    Inversely proportional to area

  4. ((d))

    Directly proportional to area

Show Answer
Answer: ((a))

Independent of area

89

At what temperature does ammonium sulphate become ferroelectric?

  1. ((a))

    0ºC

  2. ((b))

    100ºC

  3. ((c))

    25ºC

  4. ((d))

    -49.5ºC

Show Answer
Answer: ((a))

0ºC

90

Which of the following polymers are linear polymers with flexible chains?

  1. ((a))

    Phenolics

  2. ((b))

    Epoxies

  3. ((c))

    Network polymers

  4. ((d))

    Polyethylene

Show Answer
Answer: ((a))

Phenolics

91

An ideal refrigeration machine has a fixed lower temperature. The COP of the machine can be increased by—— 

  1. ((a))

    decreasing the operating speed of the machine

  2. ((b))

    increasing the higher temperature

  3. ((c))

    increasing the operating speed of the machine

  4. ((d))

    decreasing the higher temperature

Show Answer
Answer: ((a))

decreasing the operating speed of the machine

92

Which of the following transmission modes is most suitable for voice -over IP (VoIP)?

  1. ((a))

    Simplex

  2. ((b))

    Parallel

  3. ((c))

    Half-duplex

  4. ((d))

    Full-duplex

Show Answer
Answer: ((a))

Simplex

93

What is primary function of a rectifier?

  1. ((a))

    To regulate output signal

  2. ((b))

    To amplify the input signal

  3. ((c))

    To convert AC signal in DC signal

  4. ((d))

    To filter out unwanted frequencies

Show Answer
Answer: ((a))

To regulate output signal

94

The Control Unit receives opcode information from the:

  1. ((a))

    Data Register

  2. ((b))

    Program Counter (PC)

  3. ((c))

    Memory Address Register (MAR)

  4. ((d))

    Instruction Register (IR)

Show Answer
Answer: ((a))

Data Register

95

What is a significant impact of pollution on biodiversity?

  1. ((a))

    Extinction of sensitive species

  2. ((b))

    Improved soil fertility

  3. ((c))

    Enhanced aquatic ecosystems

  4. ((d))

     Increase in species diversity

Show Answer
Answer: ((a))

Extinction of sensitive species

96

Which property of tin makes it suitable for use in solder?

  1. ((a))

    High density

  2. ((b))

    High electrical conductivity

  3. ((c))

    Corrosion resistance

  4. ((d))

    Low melting point

Show Answer
Answer: ((a))

High density

97

Which property makes melamine foam suitable for soundproofing applications?

  1. ((a))

    Low thermal conductivity

  2. ((b))

    High porosity

  3. ((c))

    Chemical reactivity

  4. ((d))

    High density

Show Answer
Answer: ((a))

Low thermal conductivity

98

In a common emitter configuration the current amplification factor is expressed as—— 

  1. ((a))

    \((\Delta I_C / \Delta I_B){V{CE}} \)

  2. ((b))

    \((\Delta I_E / \Delta I_C){V{CE}}\)

  3. ((c))

    \((\Delta I_C \times \Delta I_B){V{CE}} \)

  4. ((d))

    \((\Delta I_B / \Delta I_C){V{CE}}\)

Show Answer
Answer: ((a))

\((\Delta I_C / \Delta I_B){V{CE}} \)

99

What is the effect of subcooling on the performance of a vapour compression refrigeration cycle?

  1. ((a))

    It decreases the refrigeration effect.

  2. ((b))

    It increases the condenser pressure.

  3. ((c))

    It increases the refrigeration effect.

  4. ((d))

    It reduces compressor work.

Show Answer
Answer: ((a))

It decreases the refrigeration effect.

100

Read the following statements regarding a piezoelectric transducer and select which is/are correct.

A. The use of piezoelectric transducer element is confined primarily to dynamic measurement.

B. Piezoelectric material, used in an underwater detection system, is known as sonar.

  1. ((a))

    Only B

  2. ((b))

    Only A

  3. ((c))

    Neither A nor B

  4. ((d))

    Both A and B

Show Answer
Answer: ((a))

Only B

101

Which of the following techniques is used in time-sharing systems to ensure fair CPU allocation?

  1. ((a))

    First-come-first-served scheduling

  2. ((b))

    Priority scheduling

  3. ((c))

    Shortest job first scheduling

  4. ((d))

    Round-robin scheduling

Show Answer
Answer: ((a))

First-come-first-served scheduling

102

Which IEEE standard defines Ethernet LAN (Local Area Network)?

  1. ((a))

    IEEE 802.3

  2. ((b))

    IEEE 802.15

  3. ((c))

    IEEE 802.5

  4. ((d))

    IEEE 802.11

Show Answer
Answer: ((a))

IEEE 802.3

103

What is the term for flowing water ecosystems like rivers and streams?

  1. ((a))

    Lentic

  2. ((b))

    Lotic

  3. ((c))

    Marine

  4. ((d))

    Wetland

Show Answer
Answer: ((a))

Lentic

104

Which of the following is NOT a typical application for high carbon steel?

  1. ((a))

    Springs

  2. ((b))

    Cutting tools

  3. ((c))

    Knives

  4. ((d))

    Structural beams

Show Answer
Answer: ((a))

Springs

105

For a simply supported beam of span L subjected to a central point load P, the shear force just to the left of the load is _______.

  1. ((a))

    P/2

  2. ((b))

    P/4

  3. ((c))

    P

  4. ((d))

    0

Show Answer
Answer: ((a))

P/2

106

A radiator, in a domestic heating system, operates at a temperature of 27°C. The heat flux at the surface of a radiator, if it behaves as a black body, will be ______.

  1. ((a))

    45.927 W/m2

  2. ((b))

    4.5927 W/m2

  3. ((c))

    4592.7 W/m2

  4. ((d))

    459.27 W/m2

Show Answer
Answer: ((a))

45.927 W/m2

107

Reynolds number can be represented as the ratio of:

  1. ((a))

    Inertia force to Viscous force

  2. ((b))

    Viscous force to Buoyancy force

  3. ((c))

    Viscous force to Inertia force

  4. ((d))

    Buoyancy force to Viscous force

Show Answer
Answer: ((a))

Inertia force to Viscous force

108

In which of the following processes does the formation of polymers occur by stepwise intermolecular chemical reactions that may involve more than one monomer species and there is usually a small molecular weight byproduct such as water?

  1. ((a))

    Crystallisation

  2. ((b))

    Condensation polymerisation

  3. ((c))

    Chain reaction polymerisation

  4. ((d))

    Addition polymerisation

Show Answer
Answer: ((a))

Crystallisation

109

Which of the following is added to natural rubber and heated to make ebonite?

  1. ((a))

    Sulphur

  2. ((b))

    Phosphorous

  3. ((c))

    Magnesium

  4. ((d))

    Calcium

Show Answer
Answer: ((a))

Sulphur

110

Which of the following polymers have the lowest coefficient of thermal expansion?

  1. ((a))

    Network polymers

  2. ((b))

    Thermoplastic polymers

  3. ((c))

    Linear polymers

  4. ((d))

    Branched polymers

Show Answer
Answer: ((a))

Network polymers

111

What is the phenomenon that occurs in some thermoplastic polymers in which very localised plastic deformation leads to the formation of small and interconnected microvoids called?

  1. ((a))

    Devitrification

  2. ((b))

    Crazing

  3. ((c))

    Crystallisation

  4. ((d))

    Annealing

Show Answer
Answer: ((a))

Devitrification

112

In which application does glycerine NOT serve as a humectant in the food industry?

  1. ((a))

    To prevent the oxidation of food colour

  2. ((b))

    To control ice crystal formation in frozen desserts

  3. ((c))

    To retain moisture in processed meats

  4. ((d))

    To maintain consistency and prevent drying in dairy products

Show Answer
Answer: ((a))

To prevent the oxidation of food colour

113

Which of the following is an important chemical parameter to consider when assessing water potability?

  1. ((a))

    Acidity

  2. ((b))

    High concentration of heavy metals

  3. ((c))

    Appropriate pH levels

  4. ((d))

    High pH

Show Answer
Answer: ((a))

Acidity

114

What is the typical calorific value of producer gas?

  1. ((a))

    4,500 - 5,000 kcal/m3

  2. ((b))

    1,000 - 1,200 kcal/m3

  3. ((c))

    8,000 - 10,000 kcal/m3

  4. ((d))

    2,500 - 3,000 kcal/m3

Show Answer
Answer: ((a))

4,500 - 5,000 kcal/m3

115

Which of the following is one of the main DISADVANTAGES of using hard water in a boiler?

  1. ((a))

    Improved water flow

  2. ((b))

    Increased heating efficiency

  3. ((c))

    Reduced maintenance costs

  4. ((d))

    Scaling and limescale buildup

Show Answer
Answer: ((a))

Improved water flow

116

What is the process by which an atomic nucleus splits into two or more smaller nuclei, releasing a large amount of energy?

  1. ((a))

    Fusion

  2. ((b))

    Radioactive decay

  3. ((c))

    Fission

  4. ((d))

    Nuclear transmutation

Show Answer
Answer: ((a))

Fusion

117

As per the following options, what is the most suitable property of glycerol?

  1. ((a))

    It is insoluble in water

  2. ((b))

    It is hygroscopic

  3. ((c))

    It is a solid at room temperature

  4. ((d))

    It has a strong odor

Show Answer
Answer: ((a))

It is insoluble in water

118

The EMF induced in the secondary winding of a transformer depends on the ______.

  1. ((a))

    magnetic flux linkage

  2. ((b))

    armature reaction

  3. ((c))

    power factor

  4. ((d))

    load resistance

Show Answer
Answer: ((a))

magnetic flux linkage

119

A positron is emitted in ______.

  1. ((a))

    beta-plus decay

  2. ((b))

    beta-negative decay

  3. ((c))

    alpha decay

  4. ((d))

    gamma decay

Show Answer
Answer: ((a))

beta-plus decay

120

Which of the following is the primary ore used for the extraction of nickel?

  1. ((a))

    Pentlandite

  2. ((b))

    Bauxite

  3. ((c))

    Galena

  4. ((d))

    Hematite

Show Answer
Answer: ((a))

Pentlandite

121

Which of the following is an aerobic process used in secondary wastewater treatment?

  1. ((a))

    Anaerobic Digestion

  2. ((b))

    Upflow Anaerobic Sludge Blanket (UASB)

  3. ((c))

    Activated Sludge Process

  4. ((d))

    Anaerobic Filters

Show Answer
Answer: ((a))

Anaerobic Digestion

122

The following truth table is related to which gate?

  1. ((a))

    NOR gate

  2. ((b))

    OR gate

  3. ((c))

    NAND gate

  4. ((d))

    XOR gate

Show Answer
Answer: ((a))

NOR gate

123

Read the given statements and select which is/are correct.

<br>

A. Resistance strain gauges are very useful for measurement of tension, torque, force and stresses in structures.

B. Strain gauges are used in load cells and proving rings to measure force by the strain produced.

  1. ((a))

    Both A and B

  2. ((b))

    Only B

  3. ((c))

    Only A

  4. ((d))

    Neither A nor B

Show Answer
Answer: ((a))

Both A and B

124

Which of the following is NOT a function of lubricant oils?

  1. ((a))

    Increasing friction

  2. ((b))

    Cooling through heat dissipation

  3. ((c))

    Protecting against corrosion and rust

  4. ((d))

    Cleansing by removal of contaminants

Show Answer
Answer: ((a))

Increasing friction

125

Which of the following is NOT a type of polymer PTC (positive temperature coefficient) thermistor?

  1. ((a))

    Monoswitch

  2. ((b))

    Semifuse

  3. ((c))

    Multifuse

  4. ((d))

    Polyswitch

Show Answer
Answer: ((a))

Monoswitch

126

Which of the following pairs of lime types and their characteristics is correctly matched?

  1. ((a))

    Slaked Lime – Used in RCC Construction

  2. ((b))

    Hydraulic Lime - Gains Strength in Air Only

  3. ((c))

    Quick Lime – Highly Stable

  4. ((d))

    Fat Lime - High Plasticity

Show Answer
Answer: ((a))

Slaked Lime – Used in RCC Construction

127

Which of the following is a primary air pollutant?

  1. ((a))

    Nitrogen trioxide

  2. ((b))

    Ozone

  3. ((c))

    Sulphur trioxide

  4. ((d))

    Sulphur dioxide

Show Answer
Answer: ((a))

Nitrogen trioxide

128

What type of cooling is typically used in outdoor distribution transformers?

  1. ((a))

    Dry-type

  2. ((b))

    Air natural

  3. ((c))

    Oil-immersed

  4. ((d))

    Forced air

Show Answer
Answer: ((a))

Dry-type

129

A thermocouple works on the principle of ______.

  1. ((a))

    Peltier effect

  2. ((b))

    Raman effect

  3. ((c))

    Ohm's law

  4. ((d))

    Seebeck effect

Show Answer
Answer: ((a))

Peltier effect

130

What type of network device assigns IP addresses dynamically in a LAN?

  1. ((a))

    DHCP server

  2. ((b))

    DNS server

  3. ((c))

    Router

  4. ((d))

    Switch

Show Answer
Answer: ((a))

DHCP server

131

Which of the following is an example of point-source water pollution?

  1. ((a))

    Runoff from agricultural land

  2. ((b))

    Animal faeces from dogs and birds

  3. ((c))

    Wastewater pipe from a factory

  4. ((d))

    Pollutants from car parks

Show Answer
Answer: ((a))

Runoff from agricultural land

132

Which of the following methods is used to prepare benzene from sodium benzoate?

  1. ((a))

    Decarboxylation

  2. ((b))

    Oxidation

  3. ((c))

    Polymerisation

  4. ((d))

    Hydrolysis

Show Answer
Answer: ((a))

Decarboxylation

133

Which of the following is a major environmental concern associated with Blast Furnace Gas (BFG)?

  1. ((a))

    Release of particulate matter

  2. ((b))

    High sulphur dioxide emissions

  3. ((c))

    Generation of methane

  4. ((d))

    Emission of carbon dioxide

Show Answer
Answer: ((a))

Release of particulate matter

134

In which type of gear train are the input and output shafts collinear?

  1. ((a))

    Simple gear train

  2. ((b))

    Reverted gear train

  3. ((c))

    Epicyclic gear train

  4. ((d))

    Compound gear train

Show Answer
Answer: ((a))

Simple gear train

135

What is the most common method for producing aluminium from its ore?

  1. ((a))

    Smelting

  2. ((b))

    Leaching

  3. ((c))

    Electrolytic reduction

  4. ((d))

    Blast furnace process

Show Answer
Answer: ((a))

Smelting

136

What is the primary method for extracting copper from sulphide ores like chalcopyrite?

  1. ((a))

    Electrolytic refining

  2. ((b))

    Magnetic separation

  3. ((c))

    Leaching

  4. ((d))

    Smelting and converting

Show Answer
Answer: ((a))

Electrolytic refining

137

Which type of pattern is specifically designed to produce hollow castings by incorporating cores?

  1. ((a))

    Segmental pattern

  2. ((b))

    Shell pattern

  3. ((c))

    Loose piece pattern

  4. ((d))

    Cope and drag pattern

Show Answer
Answer: ((a))

Segmental pattern

138

In a vapour compression refrigeration system, the highest temperature in the cycle occurs ______.

  1. ((a))

    before the capillary tube

  2. ((b))

    after compression

  3. ((c))

    after the capillary tube

  4. ((d))

    after evaporation

Show Answer
Answer: ((a))

before the capillary tube

139

Select the correct statement valid only for reversible process conducted by closed system; neglect change in kinetic and potential energy.

  1. ((a))

    TdS = dU + TdV

  2. ((b))

    TdS = dU + WdS

  3. ((c))

    dQ = dU + TdS

  4. ((d))

    dQ = dU + pdV

Show Answer
Answer: ((a))

TdS = dU + TdV

140

Piezoelectric load cells work on the same principle of ______ as in strain gauge load cell to measure force.

  1. ((a))

    leaching

  2. ((b))

    deformation

  3. ((c))

    electromagnet

  4. ((d))

    titration

Show Answer
Answer: ((a))

leaching

141

If n12 is the refractive index of medium 1 with respect to medium 2 and n31 is the refractive index of medium 3 with respect to medium 1, then n32, the refractive index of medium 3 with respect to medium 2 will hold the relation ______.

  1. ((a))

    n32 = n31 × n12

  2. ((b))

    n31 = n32 x n12

  3. ((c))

    n32 = n31 - n12

  4. ((d))

    n12 = n32 × n31

Show Answer
Answer: ((a))

n32 = n31 × n12

142

Which of the following is NOT a product of petroleum refining?

  1. ((a))

    Asphalt

  2. ((b))

    Kerosene

  3. ((c))

    Natural gas

  4. ((d))

    Lubricating oil

Show Answer
Answer: ((a))

Asphalt

143

What will be the correct answer of the infix expression 20 - 5 * 2?

  1. ((a))

    10

  2. ((b))

    0

  3. ((c))

    30

  4. ((d))

    20

Show Answer
Answer: ((a))

10

144

Which of the following is a characteristic of metallurgical coke?

  1. ((a))

    Contains volatile matter

  2. ((b))

    Very fragile

  3. ((c))

    Strong and porous

  4. ((d))

    Highly dense

Show Answer
Answer: ((a))

Contains volatile matter

145

What is the value of critical angle for the diamond-air interface (refractive index of diamond is 2.42)?

  1. ((a))

    47°

  2. ((b))

    25.6°

  3. ((c))

    24.4°

  4. ((d))

    90°

Show Answer
Answer: ((a))

47°

146

Which process is used to break down heavy hydrocarbons into lighter ones?

  1. ((a))

    Alkylation

  2. ((b))

    Reforming

  3. ((c))

    Distillation

  4. ((d))

    Cracking

Show Answer
Answer: ((a))

Alkylation

147

Which of the following is a close packed plane for the HCP crystal?

  1. ((a))

    (1011)

  2. ((b))

    (1010)

  3. ((c))

    (1101)

  4. ((d))

    (0001)

Show Answer
Answer: ((a))

(1011)

148

High silicon steel is commonly used in:

  1. ((a))

    aircraft frames

  2. ((b))

    automobile engines

  3. ((c))

    cooking utensils

  4. ((d))

    electrical transformers

Show Answer
Answer: ((a))

aircraft frames

149

Which of the following is NOT a stage of the Addition Polymerisation process?

  1. ((a))

    Propagation

  2. ((b))

    Termination

  3. ((c))

    Crystallisation

  4. ((d))

    Initiation

Show Answer
Answer: ((a))

Propagation

150

What is a 'carbon sink'?

  1. ((a))

    A type of fossil fuel

  2. ((b))

    A place where carbon is stored away from the atmosphere

  3. ((c))

    A process that rapidly cycles carbon

  4. ((d))

    A place where carbon is released into the atmosphere

Show Answer
Answer: ((a))

A type of fossil fuel

Attempt this paper under real exam conditions

Timed interface, section switching, instant scoring, and question-by-question analytics — free.

Start Timed Attempt