Official Paper

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

150 questions · 120 minutes · with answers · free

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General Abilities (50 questions)

The people of ___________ were famously involved in execution of the Chipko movement.

((a))
Gujarat
((b))
Delhi
((c))
Garhwal Himalayas
((d))
Assam

Show Answer

Answer: ((a))

Gujarat

Why do covalent compounds generally have low melting and boiling points?

((a))
They contain metallic bonds.
((b))
They have strong electrostatic forces.
((c))
They have a rigid lattice structure.
((d))
They have weak intermolecular forces.

Show Answer

Answer: ((a))

They contain metallic bonds.

Which of the following elements has an atomic number of 8?

((a))
Hydrogen
((b))
Nitrogen
((c))
Carbon
((d))
Oxygen

Show Answer

Answer: ((a))

Hydrogen

In an aquatic ecosystem, the phenomenon of biomagnification can best be studied in the case of _________.

((a))
phosphates
((b))
chlorine
((c))
organochlorine
((d))
DDT

Show Answer

Answer: ((a))

phosphates

Which function key is used to move text or graphics in a document?

((a))
F2
((b))
F1
((c))
F12
((d))
F5

Show Answer

Answer: ((a))

A ball of mass 50 grams is moving with a velocity of 15 m/s. What is its kinetic energy?

((a))
3.750 J
((b))
1.875 J
((c))
5.625 J
((d))
7.500 J

Show Answer

Answer: ((a))

3.750 J

In January 2025, India launched the NVS-02 satellite to strengthen which of the following navigation systems?

((a))
Galileo
((b))
Global Positioning System (GPS)
((c))
Navigation with Indian Constellation (NavIC)
((d))
Global Navigation Satellite System (GLONASS)

Show Answer

Answer: ((a))

Galileo

Which of the following options is NOT a greenhouse gas?

((a))
Methane
((b))
Carbon tetrachloride
((c))
Nitrous oxide
((d))
Carbon dioxide

Show Answer

Answer: ((a))

Methane

The main reason for which we are dependent on air is our _____.

((a))
osmoregulation
((b))
excretion
((c))
digestion
((d))
respiration

Show Answer

Answer: ((a))

osmoregulation

Which of the following was NOT an artisan guild during the Mauryan period?

మౌర్య కాలంలో ఈ క్రింది వాటిలో ఏది కళాకారుల సంఘం (artisan guild) కాదు?

((a))
Astrologer / జ్యోతిష్యుడు
((b))
Potters / కుమ్మరులు
((c))
Carpenters / వడ్రంగులు
((d))
Bankers and Merchants / బ్యాంకర్లు మరియు వ్యాపారులు

Show Answer

Answer: ((a))

Astrologer / జ్యోతిష్యుడు

Who among the following referred to the Directive Principles as the 'life-giving provisions' of the Constitution of India?

((a))
Ivor Jennings
((b))
BR Ambedkar
((c))
HM Seervai
((d))
LM Singhvi

Show Answer

Answer: ((a))

Ivor Jennings

What is the primary function of a firewall tool in a computer network?

((a))
To speed up internet connections
((b))
To monitor and control incoming and outgoing network traffic
((c))
To store data securely
((d))
To detect and remove viruses

Show Answer

Answer: ((a))

To speed up internet connections

The President has the power to dissolve which house of Parliament?

((a))
Lok Sabha only
((b))
Legislative Assembly
((c))
Both Rajya Sabha and Lok Sabha
((d))
Rajya Sabha only

Show Answer

Answer: ((a))

Lok Sabha only

Who among the following developed the notation system for Hindustani classical music?

((a))
Pandit Ravi Shankar
((b))
Pandit Vishnu Narayan Bhatkhande
((c))
Ustad Bismillah Khan
((d))
Ustad Amjad Ali Khan

Show Answer

Answer: ((a))

Pandit Ravi Shankar

Which of the following MS Excel functions is used to convert a numeric value into a text with a specific format?

((a))
NUMBERTOTEXT()
((b))
VALUE()
((c))
FORMAT()
((d))
TEXT()

Show Answer

Answer: ((a))

NUMBERTOTEXT()

In which of the following events did Deepthi Jeevanji set a world record at the 2024 World Para Athletics Championships?

((a))
400 metres T20
((b))
200 metres T20
((c))
100 metres T20
((d))
600 metres T20

Show Answer

Answer: ((a))

400 metres T20

A solution is prepared by dissolving 40 g of NaCl in 200 g of water. What is the mass per cent of NaCl in the solution?

((a))
45%
((b))
16.67%
((c))
20%
((d))
25%

Show Answer

Answer: ((a))

45%

For the protection and improvement of the environmental quality, the Environment Protection Act came into force in the year _________.

((a))
1984
((b))
1992
((c))
1986
((d))
1972

Show Answer

Answer: ((a))

1984

Who among the following Indian female cricketers won the Best International Cricketer Award (Women) at the BCCI Naman Awards 2025?

((a))
Smriti Mandhana
((b))
Mithali Raj
((c))
Harmanpreet Kaur
((d))
Jhulan Goswami

Show Answer

Answer: ((a))

Smriti Mandhana

A concave lens has a focal length of −2 cm. What is its power?

((a))
25 D
((b))
−50 D
((c))
−0.5 D
((d))
0.5 D

Show Answer

Answer: ((a))

25 D

What does LAN stand for?

((a))
Local Area Network
((b))
Large Area Network
((c))
Limited Access Node
((d))
Linked Access Network

Show Answer

Answer: ((a))

Local Area Network

Radiations that are emitted from nuclear wastes are known to cause ________ at a high rate.

((a))
diseases
((b))
emotional defects
((c))
mutations
((d))
syndromes

Show Answer

Answer: ((a))

diseases

Which country proposed the idea of holding a United Nations conference on human interactions with the environment in 1968?

((a))
United States
((b))
Canada
((c))
France
((d))
Sweden

Show Answer

Answer: ((a))

United States

Which formula should be entered in cell C2 to multiply the values of cells A2 and B2 in Excel?

((a))
=A2+B2
((b))
=MULTIPLY(A2,B2)
((c))
=A2*B2
((d))
=A2-B2

Show Answer

Answer: ((a))

=A2+B2

An object is placed 15 cm in front of a convex lens of focal length 25 cm. The image distance will be ______.

((a))
−37.5 cm
((b))
−10.0 cm
((c))
−9.37 cm
((d))
17.5 cm

Show Answer

Answer: ((a))

−37.5 cm

Due to global warming, the temperature of the earth has increased by ________

((a))
0.8°C
((b))
0.7°C
((c))
0.6°C
((d))
0.5°C

Show Answer

Answer: ((a))

0.8°C

An alloy is considered a homogeneous mixture because:

((a))
it contains two or more phases
((b))
it exhibits uniform composition throughout
((c))
its components can be separated by filtration
((d))
its components are chemically combined in fixed proportions

Show Answer

Answer: ((a))

it contains two or more phases

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

((a))
Organic fertilisers
((b))
Fungicides
((c))
Herbicides
((d))
Pesticides

Show Answer

Answer: ((a))

Organic fertilisers

Which of the following bridges is constructed over the Brahmaputra River in India?

((a))
Dhola-Sadiya Bridge
((b))
Howrah Bridge
((c))
Mahatma Gandhi Setu
((d))
Pamban Bridge

Show Answer

Answer: ((a))

Dhola-Sadiya Bridge

Which German optical technology firm inaugurated its first Global Capability Centre in Bengaluru in November 2024, with plans to double its workforce within three years?

((a))
Jenoptik
((b))
Leica
((c))
Schneider Kreuznach
((d))
Carl Zeiss AG

Show Answer

Answer: ((a))

Jenoptik

The kinetic energy of an object is derived using which of the following equations of motion?

((a))
a = (v – u) / t
((b))
s = ut + ½ at²
((c))
v = u + at
((d))
v² – u² = 2as

Show Answer

Answer: ((a))

a = (v – u) / t

What happens to the pH of pure water when a few drops of lemon juice are added?

((a))
The pH increases
((b))
The pH remains the same
((c))
The pH becomes neutral
((d))
The pH decreases

Show Answer

Answer: ((a))

The pH increases

Which of the following correctly differentiates mixtures and compounds?

Feature	Mixture	Compound
A) Separation	Can be separated by physical methods	Requires chemical methods
B) Composition	Fixed ratio	Variable ratio
C) Properties	Always the same as constituents	Different from constituents
D) Formation	By chemical reaction	By simple mixing

((a))
Option A (Separation) is correct
((b))
Option D (Formation) is correct
((c))
Option B (Composition) is correct
((d))
Option C (Properties) is correct

Show Answer

Answer: ((a))

Option A (Separation) is correct

What is the general orientation of the Himalayan ranges in the northwestern part of India?

((a))
East-South
((b))
Northeast to Southwest
((c))
South-North
((d))
Northwest to Southeast

Show Answer

Answer: ((a))

East-South

What is the primary function of a computer firewall?

((a))
To speed up internet connectivity
((b))
To prevent unauthorised access to a private network
((c))
To detect and remove computer viruses
((d))
To store user passwords securely

Show Answer

Answer: ((a))

To speed up internet connectivity

Which operating system is known for its open-source nature and community-driven development for desktops and laptops?

((a))
iOS
((b))
macOS
((c))
Windows
((d))
Linux

Show Answer

Answer: ((a))

iOS

Which type of RAM is faster and DOES NOT require refreshing?

((a))
SRAM
((b))
Dynamic Random Access Memory
((c))
Flash Memory
((d))
ROM

Show Answer

Answer: ((a))

SRAM

A sound wave with a low frequency will have _______.

((a))
a low amplitude
((b))
a short wavelength
((c))
a high pitch
((d))
a low pitch

Show Answer

Answer: ((a))

a low amplitude

The power to issue an ordinance when Parliament is NOT in session is given to the President under which Article?

((a))
Article 72
((b))
Article 110
((c))
Article 123
((d))
Article 356

Show Answer

Answer: ((a))

Article 72

A metal wire is stretched, but it does not break easily. This property is known as:

((a))
hardness
((b))
ductility
((c))
malleability
((d))
brittleness

Show Answer

Answer: ((a))

hardness

The atomic mass of sulphur is 32 u, and sulphur exists as S₈ molecules. What is the molecular mass of sulphur?

((a))
256 u
((b))
32 u
((c))
64 u
((d))
128 u

Show Answer

Answer: ((a))

256 u

Where can one find the option to change a PowerPoint template?

((a))
View → Slide Master
((b))
Insert → Themes
((c))
Design → Themes
((d))
Home → Layout

Show Answer

Answer: ((a))

View → Slide Master

Who is known as the leader of the Green Revolution in India?

((a))
C Subramaniam
((b))
Prof. MS Swaminathan
((c))
Dr. Rajendra Prasad
((d))
Tribhuvandas Kishibhai Patel

Show Answer

Answer: ((a))

C Subramaniam

Which of the following is NOT a source of collection of municipal solid waste?

((a))
Waste from homes
((b))
Radioactive waste
((c))
Waste from hospitals
((d))
Waste from schools

Show Answer

Answer: ((a))

Waste from homes

Electricity production is categorised under which of the following economic sectors?

((a))
Primary sector
((b))
Secondary sector
((c))
Tertiary sector
((d))
Quaternary sector

Show Answer

Answer: ((a))

Primary sector

Who among the following established the Bengal Chemical Swadeshi Stores?

((a))
Dadabhai Naoroji
((b))
Surendranath Banerjee
((c))
BG Tilak
((d))
Acharya PC Ray

Show Answer

Answer: ((a))

Dadabhai Naoroji

The wavelength of ultraviolet radiations which is most powerful and causes damage to the DNA is _____.

((a))
UV-C
((b))
UV-B
((c))
UV-D
((d))
UV-A

Show Answer

Answer: ((a))

UV-C

What happens when you click on the 'Forward' button in an email?

((a))
A blank email opens.
((b))
The original message is copied into a new email draft.
((c))
The email is permanently deleted.
((d))
The email is automatically sent to all contacts.

Show Answer

Answer: ((a))

A blank email opens.

Which of the following will increase the heat produced by a heating element?

((a))
Using a material with high conductivity
((b))
Decreasing the applied voltage
((c))
Using a wire of lower resistance
((d))
Increasing the current flowing through the wire

Show Answer

Answer: ((a))

Using a material with high conductivity

A car moving at a constant speed of 123 km/hr along a straight road is an example of ________.

((a))
uniform motion
((b))
rotational motion
((c))
random motion
((d))
non-uniform motion

Show Answer

Answer: ((a))

uniform motion

Technical Abilities (100 questions)

What will be the output of the following C code?

void main()

{

int result=1;

if (++result > 1)

printf("%d", result += 3);

else

printf("%d", result += 5);

}

((a))
4
((b))
5
((c))
6
((d))
7
((e))
None

Show Answer

Answer: ((a))

Which of the following statements about a hub in a star topology is true?

((a))
It prevents collisions
((b))
It forwards data to all connected devices.
((c))
It improves network security.
((d))
It filters traffic based on MAC addresses.

Show Answer

Answer: ((a))

It prevents collisions

Which type of winding is commonly used in core-type transformers?

((a))
Disk winding
((b))
Cylindrical winding
((c))
Helical winding
((d))
Sandwich winding

Show Answer

Answer: ((a))

Disk winding

Which of the following raw materials is the chief source of sulphur in the blast furnace pig iron?

((a))
Limestone
((b))
Dolomite
((c))
Coke
((d))
Haematite

Show Answer

Answer: ((a))

Limestone

What does the %d format specifier represent in scanf()?

((a))
Floating-point input
((b))
Character input
((c))
Integer input
((d))
String input

Show Answer

Answer: ((a))

Floating-point input

Which of the following polymers are composed of extended, rod-shaped and rigid molecules and in the liquid condition the molecules can become aligned in highly ordered configurations?

((a))
Foams
((b))
Thermoplastic Elastomers
((c))
Ultrahigh Molecular Weight Polyethylene
((d))
Liquid Crystal Polymers

Show Answer

Answer: ((a))

Foams

The expression $\oint dQ = \oint dW$ is valid when_——.

((a))
the first law of thermodynamics is applied to an open system in a flow process
((b))
the first law of thermodynamics is applied to a closed system for a cyclic process
((c))
the second law of thermodynamics is applied to a closed system for a cyclic process
((d))
the second law of thermodynamics is applied to an open system in a flow process

Show Answer

Answer: ((a))

the first law of thermodynamics is applied to an open system in a flow process

Which of the following pairs is correctly matched regarding door fittings?

((a))
Hinges - Used to lock the door
((b))
Aldrop - Used for sliding doors
((c))
Door Stopper - Used to hold the door at an angle
((d))
Tower Bolt - Used to open the door automatically

Show Answer

Answer: ((a))

Hinges - Used to lock the door

Which of the following is a technique used to control gaseous pollutants by transferring them into a liquid?

((a))
Adsorption
((b))
Absorption
((c))
Incineration
((d))
Filtration

Show Answer

Answer: ((a))

Adsorption

Molybdenum is added to steel to_——.

((a))
improve ductility
((b))
reduce weight
((c))
increase corrosion resistance
((d))
improve hardness and strength

Show Answer

Answer: ((a))

improve ductility

Which of the following is a major application of liquefied natural gas (LNG)?

((a))
Feedstock for plastic production
((b))
Raw material for fertiliser production
((c))
Fuel for power generation
((d))
Coolant in industrial processes

Show Answer

Answer: ((a))

Feedstock for plastic production

In an energy diagram of P-N junction, when the junction is at equilibrium_——

((a))
an energy gap between the conduction and valance bands increases
((b))
an energy gradient exists across the depletion region
((c))
no energy gradient exists across the depletion region
((d))
an energy gap between the conduction and valance bands decreases

Show Answer

Answer: ((a))

an energy gap between the conduction and valance bands increases

A router determines the best path between source and destination for sending data using:

((a))
IP addresses
((b))
MAC addresses
((c))
port numbers
((d))
data packets

Show Answer

Answer: ((a))

IP addresses

Which of the following is the most fundamental principle of surveying?

((a))
Measuring distances accurately only when required
((b))
Working from whole to part
((c))
Taking measurements without reference to control points
((d))
Avoiding triangulation methods

Show Answer

Answer: ((a))

Measuring distances accurately only when required

What is the mechanism of plastic deformation in non-crystalline ceramics?

((a))
Twinning
((b))
Slip
((c))
Viscous flow
((d))
Cross-slip

Show Answer

Answer: ((a))

Twinning

The architecture of an operating system consists of:

((a))
Kernel only
((b))
CPU and Memory
((c))
Hardware only
((d))
Kernel and Shell

Show Answer

Answer: ((a))

Kernel only

Which of the following is a disadvantage of Monel?

((a))
High cost
((b))
Low strength
((c))
Poor machinability
((d))
Susceptibility to corrosion

Show Answer

Answer: ((a))

High cost

Which of the following is NOT a way that sulfur is released into the atmosphere?

((a))
Burning of fossil fuels
((b))
Decomposition of organic molecules
((c))
Photosynthesis
((d))
Volcanic activity

Show Answer

Answer: ((a))

Burning of fossil fuels

A concave lens forms an image at a distance of 20 cm from the lens when an object is placed at a distance of 30 cm from the lens.

Calculate the power of the lens.

((a))
$\frac{5}{3}D$
((b))
$-\frac{5}{3}D$
((c))
$\frac{3}{5}D$
((d))
$-\frac{3}{5}D$

Show Answer

Answer: ((a))

$\frac{5}{3}D$

Which of the following characteristics is primarily responsible for most polymeric materials being poor conductors of electricity?

((a))
Weak bonding
((b))
Low tensile strength
((c))
Unavailability of free electrons
((d))
Low melting temperature

Show Answer

Answer: ((a))

Weak bonding

What is the drawback of hot forging compared to cold forging?

((a))
Increased hardness of the final product
((b))
Reduced ductility of the material
((c))
Poor surface finish and lower dimensional accuracy
((d))
Increased residual stresses

Show Answer

Answer: ((a))

Increased hardness of the final product

Which of the following statements is NOT true?

((a))
At critical angle incident angle is 90°
((b))
Incidence angle must be greater than critical angle
((c))
In total internal reflection no transmission of light take place
((d))
For total internal reflection light ray must travel from denser medium to rarer medium

Show Answer

Answer: ((a))

At critical angle incident angle is 90°

What is the function of an oxidiser in an explosive material?

((a))
To contribute atoms of oxidising elements for the fuel to burn
((b))
To control the rate of reaction
((c))
To decrease the sensitivity of the explosive
((d))
To absorb heat and prevent explosion

Show Answer

Answer: ((a))

To contribute atoms of oxidising elements for the fuel to burn

What will be the output of the following C code?

#include <stdio.h>

void main()

{

int Array[5]={12,32,56,78};

printf("%d", Array[4]);

}

((a))
78
((b))
0
((c))
4
((d))
Error

Show Answer

Answer: ((a))

Which of the following statements is INCORRECT about ammonium nitrate?

((a))
It is highly soluble in water.
((b))
It decomposes at the temperature 210°C-260°C.
((c))
It is hygroscopic in nature.
((d))
It has pH more than 7.5.

Show Answer

Answer: ((a))

It is highly soluble in water.

Which of the following is true for a hydraulic load cell?

((a))
This technology is cheaper than all other types of load cells.
((b))
These type of load cells are not effective devices in outdoor environments.
((c))
The load cell is completely filled with oil.
((d))
The piston does actually come in contact with the load cell.

Show Answer

Answer: ((a))

This technology is cheaper than all other types of load cells.

Which material is used to insulate the commutator segments in a DC generator?

((a))
Rubber
((b))
Mica
((c))
Fiberglass
((d))
Plastic

Show Answer

Answer: ((a))

Rubber

Why has carbon tetrachloride production and use been restricted in the UK?

((a))
It causes respiratory issues
((b))
It is a highly flammable substance
((c))
It is a known carcinogen
((d))
It depletes the ozone layer

Show Answer

Answer: ((a))

It causes respiratory issues

Which liquid fuel is most commonly used in automobiles worldwide?

((a))
Ethanol
((b))
Gasoline
((c))
Natural gas
((d))
Kerosene

Show Answer

Answer: ((a))

Ethanol

Which of the following are the Miller Indices of a close packed plane in the FCC crystal?

((a))
(100)
((b))
(112)
((c))
(110)
((d))
(111)

Show Answer

Answer: ((a))

(100)

What is the typical carbon content range in high carbon steel?

((a))
1.0.1% to 0.3%
((b))
2.0% to 4.0%
((c))
0.01% to 0.1%
((d))
0.6% to 1.5%

Show Answer

Answer: ((a))

1.0.1% to 0.3%

Which of the following is an example of an abiotic factor in an ecosystem?

((a))
The amount of sunlight
((b))
A population of deer
((c))
A forest of pine trees
((d))
A community of bacteria

Show Answer

Answer: ((a))

The amount of sunlight

What makes biodiesel a sustainable alternative to traditional diesel?

((a))
It is produced from renewable sources like vegetable oils.
((b))
It is derived from crude oil.
((c))
It has a higher energy density.
((d))
It is cheaper to produce.

Show Answer

Answer: ((a))

It is produced from renewable sources like vegetable oils.

In a p-type semiconductor, the acceptor energy level is located:

((a))
slightly below the valence band
((b))
slightly above the valence band
((c))
in the middle of conduction band and valence band
((d))
slightly below the conduction band

Show Answer

Answer: ((a))

slightly below the valence band

In a cascade refrigeration system:

((a))
refrigeration effect is obtained using a single refrigerant
((b))
two different refrigerants are used, refrigerant with low NBP is placed in the evaporator and refrigerant with high NBP is placed in condenser
((c))
two different refrigerants are used, either of the refrigerants can be placed in the evaporator or condenser side
((d))
two different refrigerants are used, refrigerant with high NBP is placed in evaporator and refrigerant with low NBP is placed in condenser

Show Answer

Answer: ((a))

refrigeration effect is obtained using a single refrigerant

A grey body $(\varepsilon = 0.8),$ emits the same amount of heat as the black body at 1075 K. The required temperature of the grey body will be_——.

((a))
113.672°C
((b))
1136.72 K
((c))
113.672 K
((d))
1136.72°C

Show Answer

Answer: ((a))

113.672°C

Which of the following steps is typically NOT involved in the preparation of glycerine for injection?

((a))
Decolorisation using activated carbon
((b))
Coarse filtration
((c))
Ultra-filtration
((d))
Fermentation

Show Answer

Answer: ((a))

Decolorisation using activated carbon

A solid shaft is replaced by a hollow shaft of the same material and weight. To achieve the same strength in torsion, the outer diameter of the hollow shaft should be:

((a))
less than the diameter of the solid shaft
((b))
independent of the diameter of the solid shaft
((c))
greater than the diameter of the solid shaft
((d))
equal to the diameter of the solid shaft

Show Answer

Answer: ((a))

less than the diameter of the solid shaft

Which of the following components has the highest percentage in coal oven gas?

((a))
Methane (CH4)
((b))
Carbon dioxide (CO2)
((c))
Carbon monoxide (CO)
((d))
Hydrogen (H2)

Show Answer

Answer: ((a))

Methane (CH4)

Which of the following statements describes the relationship between rolling friction and static friction?

((a))
Rolling friction is slightly greater than static friction
((b))
Rolling friction is always equal to static friction
((c))
Rolling friction is much smaller than static friction
((d))
Rolling friction is much greater than static friction

Show Answer

Answer: ((a))

Rolling friction is slightly greater than static friction

What will be the output of the following C code?

#include <stdio.h>

int main() {

int a = 10 b = 20

if (a = b > 15)

printf("True");

else

printf("False");

return 0;

}

((a))
False
((b))
True False
((c))
True
((d))
Compile-time error

Show Answer

Answer: ((a))

False

Calculate the mass defect of the Helium nucleus which consists of 2 proton and 2 neutrons. The masses of the individual particle are:

Mass of proton - 1.007276 u

Mass of neutron - 1.008665 น

Mass of helium nucleus -4.001503 น

((a))
0.048377 u
((b))
0.040377 u
((c))
0.030379 u
((d))
0.038377 u

Show Answer

Answer: ((a))

0.048377 u

Which property of brass makes it suitable for musical instruments?

((a))
Low density
((b))
High melting point
((c))
Excellent acoustic properties
((d))
High electrical conductivity

Show Answer

Answer: ((a))

Low density

Which of the following correctly depicts the progressive metamorphism of coal and its effect on the Increase In rank?

((a))
Peat → Lignite → Bituminous coal → Anthracite → Graphite
((b))
Lignite Peat → Bituminous coal Anthracite → Graphite
((c))
Lignite → Bituminous coal → Peat → Anthracite → Graphite
((d))
Peat Lignite → Anthracite →Bituminous coal → Graphite

Show Answer

Answer: ((a))

Peat → Lignite → Bituminous coal → Anthracite → Graphite

There are two tables: Professor and Department. In order to retrieve all employees and their department names, even if some employees are not assigned to a department, which JOIN should be used?

((a))
FULL JOIN
((b))
INNER JOIN
((c))
LEFT JOIN
((d))
RIGHT JOIN

Show Answer

Answer: ((a))

FULL JOIN

What is the correct way to create a hyperlink in HTML?

((a))
<a>www.xyz.com</a>
((b))
<url>www.xyz.com</url>
((c))
<link href="www.zyx.com">Click Here</link>
((d))
<a href="www.xyz.com">Click Here</a>

Show Answer

Answer: ((a))

What is the primary advantage of using a multi-level cache hierarchy?

((a))
Decreased memory access latency
((b))
Improved disk read/write speeds
((c))
Reduced power consumption
((d))
Increased main memory capacity

Show Answer

Answer: ((a))

Decreased memory access latency

Which process is used to produce coal oven gas?

((a))
Fractional distillation
((b))
Electrolysis
((c))
Destructive distillation of coal
((d))
Steam reforming

Show Answer

Answer: ((a))

Fractional distillation

For semiconductor the energy (E_g) band gap (at room temperature) between valence band and conduction band is_——

((a))
$E_g = 7,\text{eV}$
((b))
$E_g = 0,\text{eV}$
((c))
$E_g > 3,\text{eV}$
((d))
$E_g < 3,\text{eV}$

Show Answer

Answer: ((a))

$E_g = 7,\text{eV}$

100

In a compound gear train, the 'Train Value' is:

((a))
the reciprocal of the velocity ratio
((b))
the ratio of the speed of the driving gear to the speed of the driven gear
((c))
the ratio of the number of teeth on the driven gear to the driver gear
((d))
the product of the gear ratios in all stages

Show Answer

Answer: ((a))

the reciprocal of the velocity ratio

101

Which of the following equations represents the voltage-pressure relationship in a piezoelectric transducer?

((a))
V = gPt
((b))
V = P/gt
((c))
V = g/Pt
((d))
V = gP/t

Show Answer

Answer: ((a))

V = gPt

102

What is the lowest temperature at which rubber-like behaviour persists for many of the common elastomers and below which an elastomer becomes brittle?

((a))
Critical temperature
((b))
Curie temperature
((c))
Glass transition temperature
((d))
Neel temperature

Show Answer

Answer: ((a))

Critical temperature

103

Which of the following is a consequence of climate change that threatens biodiversity?

((a))
Expansion of natural habitats
((b))
Increased agricultural yields
((c))
Decrease in human population
((d))
Melting ice caps affecting polar habitats

Show Answer

Answer: ((a))

Expansion of natural habitats

104

In a common emitter transistor, the collector current (Ic) is 10 mA and the base current (IB) is 0.1 mA. Calculate the current gain of the transistor.

((a))
1
((b))
10
((c))
0.1
((d))
100

Show Answer

Answer: ((a))

105

The emissive power of certain black bodies is P. If the temperature of the black body is tripled, the emissive power will become ______.

((a))
81P
((b))
27P
((c))
9P
((d))
3P

Show Answer

Answer: ((a))

81P

106

Which of the following ceramics exhibits piezoelectricity?

((a))
BaTiO₃
((b))
ZrO₂
((c))
Al₂O₃
((d))
MgO

Show Answer

Answer: ((a))

BaTiO₃

107

Which of the following is NOT a property of nuclear force?

((a))
It is attractive in nature.
((b))
Nuclear force is much stronger than Coulomb's force.
((c))
It has saturation property.
((d))
It depends on charge.

Show Answer

Answer: ((a))

It is attractive in nature.

108

The refringent enters in the evaporator as ______ in the ideal vapour compression cycle.

((a))
high-pressure liquid
((b))
low-pressure liquid
((c))
low-pressure liquid-vapor mixture
((d))
low-pressure vapor

Show Answer

Answer: ((a))

high-pressure liquid

109

What is the boiling point of ethyl alcohol (ethanol) at standard atmospheric pressure?

((a))
51.2 °C
((b))
100 °C
((c))
78.2 °C
((d))
120 °C

Show Answer

Answer: ((a))

51.2 °C

110

Which of the following impurities is commonly found in Coal Oven Gas (COG) and must be removed before its use?

((a))
Helium (He)
((b))
Ammonia (NH₃)
((c))
Oxygen (O₂)
((d))
Argon (Ar)

Show Answer

Answer: ((a))

Helium (He)

111

In a full mesh topology with 7 nodes, how many direct connections are required?

((a))
7
((b))
14
((c))
21
((d))
11

Show Answer

Answer: ((a))

112

For mass production of small components, which of the following is the most suitable pattern?

((a))
Loose piece pattern
((b))
Match plate pattern
((c))
Skeleton pattern
((d))
Sweep pattern

Show Answer

Answer: ((a))

Loose piece pattern

113

What is the purpose of dechlorination in tertiary wastewater treatment?

((a))
To remove the chlorine that was used to disinfect the water
((b))
To filter out large solid contaminants
((c))
To add chlorine to kill bacteria and viruses
((d))
To purify wastewater through oxidation

Show Answer

Answer: ((a))

To remove the chlorine that was used to disinfect the water

114

Why is biodiversity important for agriculture?

((a))
Because it promotes the use of monoculture farming
((b))
Because it reduces the need for pollination
((c))
Because it supports pollinators and maintains healthy soil
((d))
Because it decreases the nutritional value of crops

Show Answer

Answer: ((a))

Because it promotes the use of monoculture farming

115

A light incidence on a mirror at an angle 30°, calculate the angle of reflection.

((a))
90°
((b))
60°
((c))
45°
((d))
30°

Show Answer

Answer: ((a))

90°

116

Which of the following raw materials in blast furnace iron making acts as a fuel source to provide the heat, acts as a reducing agent, and provides an open permeable bed through which slag and metal pass down into the hearth and hot reducing gases pass upwards?

((a))
Dolomite
((b))
Coke
((c))
Limestone
((d))
Coal

Show Answer

Answer: ((a))

Dolomite

117

Which property of copper makes it ideal for electrical wiring?

((a))
High density
((b))
High electrical conductivity
((c))
Low thermal conductivity
((d))
Low ductility

Show Answer

Answer: ((a))

High density

118

Which of the following methods is commonly NOT used for the commercial preparation of ammonium chloride?

((a))
Reacting ammonium sulphate with sodium chloride, involving heating, evaporation and cooling
((b))
Reacting sodium chloride with carbon dioxide and ammonia in the Solvay process
((c))
Reacting ammonia with hydrogen chloride gas or hydrochloric acid
((d))
Electrolysis of ammonium salts

Show Answer

Answer: ((a))

Reacting ammonium sulphate with sodium chloride, involving heating, evaporation and cooling

119

What is the number of the nearest neighbour atoms in contact with any atom in the BCC crystal?

((a))
8
((b))
12
((c))
4
((d))
6

Show Answer

Answer: ((a))

120

Which of the following polymers have extensive covalent crosslinks between adjacent molecular chains?

((a))
Network polymers
((b))
Linear polymers
((c))
Thermoplastic polymers
((d))
Polyethylene

Show Answer

Answer: ((a))

Network polymers

121

Which of the following is a physical property of benzene?

((a))
It reacts vigorously with water
((b))
It is a colourless liquid with a sweet odour
((c))
It is highly reactive due to the presence of double bonds
((d))
It is denser than water

Show Answer

Answer: ((a))

It reacts vigorously with water

122

Which of the following statements removes a primary key constraint from an existing table whose name is BookStore?

((a))
ALTER TABLE BookStore REMOVE PRIMARY KEY;
((b))
DELETE PRIMARY KEY FROM BookStore;
((c))
DROP PRIMARY KEY FROM BookStore;
((d))
ALTER TABLE BookStore DROP PRIMARY KEY;

Show Answer

Answer: ((a))

ALTER TABLE BookStore REMOVE PRIMARY KEY;

123

By which of the following methods do the conducting polymers which have an electron energy band structure characteristic of that for an electrical insulator at 0 K become conductive?

((a))
Heat treatment
((b))
Annealing
((c))
Crazing
((d))
Doping

Show Answer

Answer: ((a))

Heat treatment

124

Which of the following is the deformation behaviour of glassy thermoplastics below their glass transition temperatures?

((a))
Flexible
((b))
Soft
((c))
Ductile
((d))
Brittle

Show Answer

Answer: ((a))

Flexible

125

Select the correct option based on the given statements about the soundness test of cement.

Statement 1: The soundness test ensures that cement does not undergo excessive expansion after setting.

Statement 2: Excess magnesia (MgO) and free lime (CaO) in cement cause volume expansion.

((a))
Statement 1 is true, but Statement 2 is false.
((b))
Both statements are true, and Statement 2 explains Statement 1.
((c))
Both statements are true, but Statement 2 does not explain Statement 1.
((d))
Statement 1 is false, but Statement 2 is true.

Show Answer

Answer: ((a))

Statement 1 is true, but Statement 2 is false.

126

How does hard water affect the lifespan of boiler components?

((a))
It has no effect on lifespan
((b))
It extends the lifespan due to better heat retention
((c))
It accelerates wear and tear on components
((d))
It improves the efficiency of components

Show Answer

Answer: ((a))

It has no effect on lifespan

127

In the context of space exploration, what is the primary reason for using cryogenic liquid fuels like liquid hydrogen and liquid oxygen in rocket propulsion systems?

((a))
They provide the highest specific impulse among chemical propellants.
((b))
They are easier to store and handle than other fuels.
((c))
They produce minimal greenhouse gas emissions.
((d))
They are cheaper to produce than solid fuels.

Show Answer

Answer: ((a))

They provide the highest specific impulse among chemical propellants.

128

Molybdenum is commonly used in ______.

((a))
high carbon steel
((b))
high-speed steel
((c))
low carbon steel
((d))
stainless steel

Show Answer

Answer: ((a))

high carbon steel

129

What is the primary reason platinum metal is preferred over other metals for Resistance Temperature Detector (RTD) construction?

((a))
It has a high thermal conductivity.
((b))
It is the most cost-effective metal for temperature sensing.
((c))
It has a stable and non linear relation ship between temperature and resistance.
((d))
It exhibits a perfectly linear resistance-temperature relationship.

Show Answer

Answer: ((a))

It has a high thermal conductivity.

130

The cycle on which an air refrigerator works is known as ______

((a))
Carnot cycle
((b))
Ericson cycle
((c))
Stirling cycle
((d))
Bell Coleman cycle

Show Answer

Answer: ((a))

Carnot cycle

131

What is the difference between armature torque (T_a) and shaft torque (T_s) called?

((a))
Loss torque
((b))
Rotor resistance torque
((c))
Electrical torque
((d))
Eddy current torque

Show Answer

Answer: ((a))

Loss torque

132

Which property of zinc makes it suitable for galvanising steel?

((a))
High density
((b))
Corrosion resistance
((c))
High melting point
((d))
High electrical conductivity

Show Answer

Answer: ((a))

High density

133

Select the correct option based on the given statements regarding bamboo reinforcement in concrete structures.

Statement 1: Bamboo can be used as reinforcement in concrete structures.

Statement 2: Bamboo reinforcement provides strength equal to steel in all conditions.

((a))
Statement 1 is true, but Statement 2 is false.
((b))
Both Statements 1 and 2 are false.
((c))
Both Statements 1 and 2 are true.
((d))
Statement 1 is false, but Statement 2 is true.

Show Answer

Answer: ((a))

Statement 1 is true, but Statement 2 is false.

134

Which of the following materials is commonly used in piezoelectric transducers?

((a))
Silicon
((b))
Copper
((c))
Quartz
((d))
Aluminium

Show Answer

Answer: ((a))

Silicon

135

How does hard water affect energy consumption in boilers?

((a))
Decreases energy consumption
((b))
Increases energy consumption
((c))
No effect on energy consumption
((d))
Stabilises energy consumption

Show Answer

Answer: ((a))

Decreases energy consumption

136

The 'Moody's Chart' is used to determine the ______.

((a))
Reynolds number
((b))
friction factor in pipe flow
((c))
hydraulic radius
((d))
velocity of flow

Show Answer

Answer: ((a))

Reynolds number

137

A thermocouple vacuum gauge operates on the principle that at low pressures, the thermal conductivity of a gas is the function of ______.

((a))
pressure
((b))
resistivity
((c))
density
((d))
temperature

Show Answer

Answer: ((a))

pressure

138

Match the Plane Table Methods with their Characteristics.

Method	Characteristic
P) Radiation	1) Uses two known points to locate an unknown point
Q) Intersection	2) Involves connecting several stations in sequence
R) Resection	3) Used when a single point is fixed and multiple points are determined
S) Traversing	4) Determines the position of the instrument station

((a))
P-2, Q-4, R-3, S-1
((b))
P-3, Q-1, R-4, S-2
((c))
P-1, Q-3, R-2, S-4
((d))
P-4, Q-2, R-1, S-3

Show Answer

Answer: ((a))

P-2, Q-4, R-3, S-1

139

Which of the following polymers soften when heated and harden when cooled?

((a))
Network polymers
((b))
Thermoplastic polymers
((c))
Thermosetting polymers
((d))
Crosslinked polymers

Show Answer

Answer: ((a))

Network polymers

140

By reverse biasing the PN junction diode, the width of depletion layer ______.

((a))
is independent of bias
((b))
remains same as that of in forward bias PN junction
((c))
increases
((d))
decreases

Show Answer

Answer: ((a))

is independent of bias

141

Transformers work on the principle of ______.

((a))
displacement current
((b))
self induction
((c))
conservation of charge
((d))
mutual induction

Show Answer

Answer: ((a))

displacement current

142

For a certain material, the values of transmissivity and reflectivity are specified as 0.88 and 0.07, respectively. The absorptivity of that material is ______.

((a))
0.88
((b))
1
((c))
0.05
((d))
0.07

Show Answer

Answer: ((a))

0.88

143

Which of the following is an example of a solid lubricant?

((a))
Lithium grease
((b))
Silicone grease
((c))
Calcium grease
((d))
Graphite

Show Answer

Answer: ((a))

Lithium grease

144

What is the primary indicator of the biological health of a water body?

((a))
Electrical conductivity
((b))
pH
((c))
Dissolved oxygen
((d))
Turbidity

Show Answer

Answer: ((a))

Electrical conductivity

145

______ type of flame is commonly used for welding mild steel.

((a))
Neutral
((b))
Reducing
((c))
Oxidising
((d))
Carburising

Show Answer

Answer: ((a))

Neutral

146

Select the correct statement.

((a))
Stefan-Boltzmann Law is obtained by integrating Plank's Law over all frequencies
((b))
Stefan-Boltzmann Law is obtained by integrating Plank's Law over all wavelengths.
((c))
Stefan-Boltzmann Law is obtained by integrating Wien's Displacement Law over all frequencies.
((d))
Stefan-Boltzmann Law is obtained by integrating Wien's Displacement Law over all wavelengths.

Show Answer

Answer: ((a))

Stefan-Boltzmann Law is obtained by integrating Plank's Law over all frequencies

147

What is the dimension of strain?

((a))
[M⁰L⁰T⁰]
((b))
[M¹L²T^-2]
((c))
[M¹L¹T¹]
((d))
[M⁰L³T⁰]

Show Answer

Answer: ((a))

[M⁰L⁰T⁰]

148

Which of the following are the various types of load cells used to convert slowly varying forces into electrical signals?

((a))
Dynamic load cells, hydraulic load cells and pneumatic load cells
((b))
Hydraulic load cells, pneumatic load cells and strain gauge load cells
((c))
Dynamic load cells, hydraulic load cells and strain gauge load cells
((d))
Dynamic load cells, pneumatic load cells and strain gauge load cells

Show Answer

Answer: ((a))

Dynamic load cells, hydraulic load cells and pneumatic load cells

149

Which of the following is the primary source of calcium in Portland cement production?

((a))
Clay
((b))
Shale
((c))
Limestone
((d))
Iron ore

Show Answer

Answer: ((a))

Clay

150

What is the purpose of using A-weighting in noise measurement?

((a))
To measure peak sound pressure from machinery
((b))
To mirror the range of human hearing sensitivity
((c))
To measure low-frequency components of sound
((d))
To represent noise levels without any frequency weights

Show Answer

Answer: ((a))

To measure peak sound pressure from machinery

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