Search Previous Year Questions

Find real questions from previous competitive exam papers with answers and solutions.

Leave the keyword blank to browse saved questions for your selected exam, newest papers first. Add a keyword, year or topic to narrow the results.

Browse complete papers
Showing 10 question(s)
Clear

Question 101

Kolkata Police SI 2021• Test

The process of cell division in Amoeba is termed as

  1. AOption (a)

    Mycosis

  2. BOption (b)

    Amitosis

  3. COption (c)

    Mitosis

  4. DOption (d)

    Meiosis

View answer & explanation

Correct answer

Answer: (b)B.

Amitosis

Why this answer is correct

The correct answer is -Amitosis.

Key Points

  • Amitosis
  • Direct cell division (also known as karyostenosis, asymmetric cell division, or binary fission), or mitosis.
  • For this kind of cell multiplication, mitosis is not required, despite popular belief.
  • The ciliate polyploid macronucleus reproduces by amitotic nuclear division.
  • The alleles from each parent are randomly distributed during amitosis, as opposed to being evenly split during regular mitosis.
  • Amoeba uses amitosis or binary fission to duplicate themselves.
  • It is the asexual method of reproduction for Amoeba.

Additional Information

  • Mitosis
  • It is the division where the daughter cells come from one parent cell.
  • The daughter and parent cells are identical to each other.
  • The division includes five steps, namely
  • Prophase
  • Metaphase
  • Anaphase
  • Telophase
  • The alleles are distributed equally after the mitotic division.
  • Meiosis
  • The division occurs in gamete-producing organs like ovaries and testicles.
  • In this division, the genetic material is segregated into four cells.
  • It has two division stages
  • Meiosis I
  • Meiosis II
  • Each meiosis Division stage has four phases, namely
  • Prophase
  • MEtaphase
  • Anaphase
  • Telophase
  • After completing meiosis I and meiosis II, four daughter cells are produced that contain the n chromosomes instead of 2n.
  • Mycosis
  • Mycosis is a fungal infection that may affect any part of the body.
  • Whether it's the skin, the subcutaneous tissue, or the organs.
  • A wide variety of fungi may cause mycosis.
  • A variety of variables, such as:
  • Hot and humid climate.
  • Wearing wet clothes or swimsuits for long durations.
  • Using a pair of closed, synthetic shoes regularly.
  • Do not remove your shoes at the door of a hotel or fitness center.
  • Rather than being a reproducing division, it is a debilitating fungal illness that may be treated.

Question 102

Kolkata Police SI 2021• Test

A sum was put at simple interest at a certain rate for 3 years. Had it been put at 1% higher rate; it would have fetched Rs. 5,100 more. The sum is

  1. AOption (a)

    Rs. 1,25,000

  2. BOption (b)

    Rs. 1,70,000

  3. COption (c)

    Rs. 1,20,000

  4. DOption (d)

    Rs. 1,50,000

View answer & explanation

Correct answer

Answer: (b)B.

Rs. 1,70,000

Why this answer is correct

Given:

Simple interest (SI) is Rs. 5100 more

N = 3 years

Rate of interest (R) is 1 % higher

Concept used:

\(SI = {PNR \over 100}\)

Calculation:

Let, P be 'x' and R be 'R + 1'

Substitute the values in the formula,

⇒ \(SI = {PNR \over 100}\)

We know that SI is Rs. 5100 more

⇒ \(SI + 5100 = {x(3)(R + 1) \over 100} \)

⇒ \({PNR \over 100} + 5100 = {x(3)(R + 1) \over 100} \)

 

⇒ \({x(3)R \over 100} + 5100 = {x(3)(R + 1) \over 100} \)

⇒ \({x(3)R \over 100} - {x(3)(R + 1) \over 100} = - 5100 \)

⇒ \(- {3x (R + 1 - R)\over 100} = - 5100 \)

⇒ \({3x (R + 1 - R)\over 100} = 5100 \)

⇒ \({3x (R + 1 - R)} = 510000\)

⇒ \({3x} = 510000 \)

⇒ \(x = {510000 \over 3} \)

⇒ \(x = 170000;\)

∴ The sum is Rs. 1,70,000.

Question 103

Kolkata Police SI 2021• Test

From the given alternative words, select the word which cannot be formed using the letters of the given word:

PHOTOSYNTHETIC

  1. AOption (a)

    PRONE

  2. BOption (b)

    THOSE

  3. COption (c)

    COTTON

  4. DOption (d)

    SCENT

View answer & explanation

Correct answer

Answer: (a)A.

PRONE

Why this answer is correct

  1. The word 'PRONE' cannot be made from the word "PHOTOSYNTHETIC" because letter 'R' is used in given word 'PRONE'.

  2. The word 'THOSE' can be made with the word "PHOTOSYNTHETIC" because all the letters of the word are present in the given word.

  3. The word 'COTTON' can be made with the word "PHOTOSYNTHETIC" because all the letters of the word are present in the given word.

  4. The word 'SCENT' can be made with the word "PHOTOSYNTHETIC" because all the letters of the word are present in the given word.

∴ Here, the word 'PRONE' cannot be made from the given word "PHOTOSYNTHETIC".

Hence, the correct answer is "PRONE".

Question 104

Kolkata Police SI 2021• Test

In 1943, Subhas Chandra Bose formed the Provisional Government of Free India at

  1. AOption (a)

    Berlin

  2. BOption (b)

    Rangoon

  3. COption (c)

    Bangkok

  4. DOption (d)

    Singapore

View answer & explanation

Correct answer

Answer: (d)D.

Singapore

Why this answer is correct

The correct answer is Singapore.

Key Points

  • On  21 October 1943, Subhash Chandra Bose proclaimed the formation of the Provisional Government of Free India in Singapore.
  • It was also called Azad Hind or Free India.
  • It was established with financial, political and military support from Imperial Japan.
  • The Indian National Army (INA) was the army of the Azad Hind government.
  • Azad Hind had diplomatic ties with Nazi Germany, the Italian Socialist Republic, the Empire of Japan, Thailand, Burma, Croatia, Manchukuo and the Second Philippine Republic.

Additional Information 

  • Subhas Chandra Bose was born on 23rd January 1897, in Cuttack, Orissa Division, Bengal Province, to Prabhavati Dutt Bose and Janakinath Bose.
  • His Jayanti is celebrated as 'Parakram Diwas' on 23rd January.
  • At Rangoon and Singapore, Subhash Chandra Bose established two Indian National Army Headquarters.
  • The Rani Jhansi regiment was created as a women's unit. Lakshmi Sehgal was in charge of the regiment.

Question 105

Kolkata Police SI 2021• Test

In a code language 724 means 'leaf is green', 371 means 'green and blue' and 438 means 'sky is blue'. Then which numbers represent 'leaf' and 'is'?

  1. AOption (a)

    7 and 4

  2. BOption (b)

    2 and 7

  3. COption (c)

    2 and 8

  4. DOption (d)

    2 and 4

View answer & explanation

Correct answer

Answer: (d)D.

2 and 4

Why this answer is correct

The logic followed here is :-

∴ Here, 'leaf' is coded as '2' and 'is' is coded as '4'.

Hence, the correct answer is "2 and 4".

Question 106

Kolkata Police SI 2021• Test

How many two digit prime numbers are there?

  1. AOption (a)

    21

  2. BOption (b)

    25

  3. COption (c)

    Can't be determined

  4. DOption (d)

    23

View answer & explanation

Correct answer

Answer: (a)A.

21

Why this answer is correct

Concept used:

A number which can be divided exactly by itself and 1 is known as prime number.

Calculation:

The prime numbers between 1 and 10 = 2, 3, 5, 7

The prime numbers between 10 and 100 are = 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47, 53, 59, 61, 67, 71, 73, 79, 83, 89, 97

∴ The total number of two digit prime numbers are 21.

Question 107

Kolkata Police SI 2021• Test

Which one of the following is not a Dwarf Planet?

  1. AOption (a)

    Ceres

  2. BOption (b)

    Pluto

  3. COption (c)

    Eris

  4. DOption (d)

    Neptune

View answer & explanation

Correct answer

Answer: (d)D.

Neptune

Why this answer is correct

The correct answer is Neptune.

Key Points

  • A dwarf planet, as defined by the International Astronomical Union, is a celestial entity that orbits the sun.
  • It has enough mass to assume a roughly spherical shape.
  • It has not cleared the area around its orbit and is not a moon.
  • This classification of solar system bodies was established by the International Astronomical Union (IAU) in August 2006, with Pluto,
  • The even more distant object Eris, and the asteroid Ceres serve as the category's inaugural members.
  • Neptune is still regarded as a planet since its mass exceeds that of anything else that passes through its orbit (including Pluto).
  • Since Neptune is 8000 times more massive than Pluto, Pluto is a dwarf planet and Neptune is a planet.

 Additional Information

  • The dwarf planet is a body outside of a natural satellite (the moon) that orbits the Sun.
  • It is conceptually smaller than the planet Mercury but is large enough for its own gravity to have significantly rounded its shape.
  • These bodies, unlike big planets, are not massive enough to have attracted the majority of neighbouring smaller bodies by gravitational pull, preventing them from enlarging.
  • The IAU decided to set up a procedure for identifying such entities that are currently known or that would be identified as dwarf planets.

Question 108

Kolkata Police SI 2021• Test

If 'X $ Y' means 'X is father of Y'; 'X # Y' means 'X is mother of Y'; 'X × Y' means 'X is sister of Y', then how is D related to N in N # A $ B × D?

  1. AOption (a)

    Granddaughter

  2. BOption (b)

    Nephew

  3. COption (c)

    Can not be determined

  4. DOption (d)

    Grandson

View answer & explanation

Correct answer

Answer: (c)C.

Can not be determined

Why this answer is correct

Preparing the family tree using the following symbols:

According to the given information,

X is
Symbol$#×
Meaningfathermothersister
Of Y

The given expression is :

'N # A $ B × D' → N is mother of A, A is father of B, B is sister of D.

∴ Here, 'D' may be 'grandson' or 'granddaughter' cannot be determined.

Hence, the correct answer is "Can not be determined".

Question 109

Kolkata Police SI 2021• Test

Torr is the Unit of

  1. AOption (a)

    Momentum

  2. BOption (b)

    Pressure

  3. COption (c)

    Work

  4. DOption (d)

    Force

View answer & explanation

Correct answer

Answer: (b)B.

Pressure

Why this answer is correct

The correct option is Pressure.

Key Points

  • A unit of pressure based on an absolute scale, the torr is equal to precisely 1760 of a standard atmosphere 101325 Pascal.
  • One torr equals exactly 133.32 Pascal.
  • Pressure is the term for the force acting on a unit area of a surface.
  • It operates perpendicular to the surface being applied pressure.

Additional Information

Force:

  • The push or pull on a mass-containing item changes its velocity.
  • An external force is an agent that has the power to alter the resting or moving condition of a body.
  • It has a direction and a magnitude.
  • The newton, abbreviated N, is the SI unit of force.

Work:

  • The result of force and displacement is called work.
  • Work done when a force acts on an object is just the sum of the force's strength and the displacement the force causes in the object.
  • Joule is the SI unit of work (J).
  • The work accomplished by the force of one newton creating a displacement of one meter is known as a joule.

Momentum:

  • Momentum is characterized as the intensity of a body's motion.
  • As momentum depends on both velocity and the direction of the body's motion, it is quantified by "mass velocity".
  • The Newton-second can be used as the momentum unit (Ns).
  • In the CGS system, the unit of momentum is the gram-centimeters per second (g-cm/s), where the mass is measured in grams and the velocity in centimeters per second.

Question 110

Kolkata Police SI 2021• Test

Which of the following is not a bacteria related disease?

  1. AOption (a)

    Pneumonia

  2. BOption (b)

    Typhoid

  3. COption (c)

    Influenza

  4. DOption (d)

    Diphtheria

View answer & explanation

Correct answer

Answer: (c)C.

Influenza

Why this answer is correct

The correct answer is -Influenza.

Key Points

  • Influenza
  • The flu is a popular name for a respiratory illness caused by influenza viruses.
  • Symptoms vary from moderate to severe and commonly
  • include fever,
  • runny nose,
  • sore throat,
  • muscular discomfort,
  • headache,
  • coughing, and
  • exhaustion.
  • In youngsters, this most often manifests as diarrhea and vomiting.
  • There are four recognized strains A, B, C, and D influenza viruses
  • IAV, or influenza A virus, is present in various animals, including humans and pigs.
  • Humans are the primary hosts for Influenza A (HAV), Influenza B (IAV), and Influenza C (ICV) viruses.
  • Whereas cattle and swine are the natural hosts for Influenza D (IDV).
  • Seasonal epidemics caused by IAV and IBV circulate among people, whereas ICV infects youngsters mildly.

Additional Information

  • Pneumonia
  • It is an infection of the alveoli, the air sacs in the lungs.
  • Symptoms may include a
  • productive or dry cough,
  • chest discomfort,
  • fever, and
  • trouble breathing.
  • Both viruses and bacteria are capable of causing, it, however, Streptococcus pneumoniae is the most common bacterial culprit.
  • For those who have compromised immune systems, this condition is common.
  • Typhoid
  • Salmonella serotype Typhi is the causative agent of typhoid.
  • Depending on the severity, symptoms might appear anywhere from six hours to thirty days following exposure.
  • In many cases, a high fever develops gradually over a few days.
  • Typhoid occurs when one consumes either food or water tainted with an infected individual's stool.
  • Polluted water and a lack of proper hygiene are other potential dangers.
  • Diphtheria
  • Corynebacterium diphtheriae is the causative agent of diphtheria infection.
  • The majority of illnesses cause no symptoms and progress very slowly.
  • Typical early symptoms include a high temperature and a sore throat.
  • Transmission of diphtheria often occurs via close personal contact or by breathing contaminated air.
  • Contaminated items may potentially play a role in the disease's transmission.