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 111

Kolkata Police SI 2021• Test

If '+' means '×', '÷' means '−', '×' means +' and '−' means '÷', then what is the value of (2 + 27 − 3 + 2 × 3 ÷ 2)?

  1. AOption (a)

    27

  2. BOption (b)

    35

  3. COption (c)

    39

  4. DOption (d)

    37

View answer & explanation

Correct answer

Answer: (d)D.

37

Why this answer is correct

The logic followed here is :-

By using BODMAS RULE :

Symbols+÷×-
Means×-+÷

Given expression is : (2 + 27 − 3 + 2 × 3 ÷ 2)

After replacing operators in place of alphabets the expression is as follows : 2 × 27 ÷ 3 × 2 + 3 - 2

= 2 × 27 ÷ 3 × 2 + 3 - 2

= 2 × 9 × 2 + 3 - 2

= 36 + 3 - 2

= 39 - 2

= 37

Hence, the correct answer is "37".

Question 112

Kolkata Police SI 2021• Test

Which of the following is known as Mixed gland?

  1. AOption (a)

    Liver

  2. BOption (b)

    Thyroid

  3. COption (c)

    Pancreas

  4. DOption (d)

    Pituitary

View answer & explanation

Correct answer

Answer: (c)C.

Pancreas

Why this answer is correct

The correct answer is Pancreas.

Key Points

Pancreas:

  • The pancreas is a mixed gland having both endocrine and exocrine functions.
  • The endocrine portion secretes hormones, insulin, and glucagon while the exocrine portion secretes an alkaline pancreatic juice containing enzymes and bicarbonate.

Additional Information Exocrine glands:

  • It is a gland that makes substances such as sweat, tears, saliva, milk, and digestive juices, and releases them through a duct or opening to a body surface.
  • Examples: Sweat glands, lacrimal glands, salivary glands, mammary glands, and digestive glands in the stomach, pancreas, and intestines.

Endocrine glands:

  • The glands that make up the endocrine system produce chemical messengers called hormones that travel through the blood to other parts of the body known as Endocrine glands.
  • Examples: Pituitary, thyroid, parathyroid, thymus, and adrenal glands.

Liver:

  • It is in the upper right section of the abdomen and sits below the diaphragm.
  • It is the largest solid organ and the largest gland in the human body.
  • It carries out over 500 essential tasks.
  • The roles of the liver include detoxification, protein synthesis, and the production of chemicals that help digest food.
  • It is part of the digestive system.
  • The liver is the largest gland.

Question 113

Kolkata Police SI 2021• Test

Which least number is divisible by 12, 15, 20 and 25?

  1. AOption (a)

    150

  2. BOption (b)

    300

  3. COption (c)

    600

  4. DOption (d)

    200

View answer & explanation

Correct answer

Answer: (b)B.

300

Why this answer is correct

Given:

12, 15, 20 and 25

Concept used:

LCM = Least Common Multiple

Calculation:

Now, finding the LCM of 12, 15, 20 and 25

LCM = 2 × 2 × 3 × 5 × 5 = 300

From the given options,

The  multiples of 300 are 300 and 600.

∴ The least number which is divisible by 12, 15, 20 and 25 is 300.

Question 114

Kolkata Police SI 2021• Test

Explain the following relationship with the help of Venn diagram:

Singer, Musician, Doctor

  1. AOption (a)

  2. BOption (b)

  3. COption (c)

  4. DOption (d)

View answer & explanation

Correct answer

Answer: (d)D.

Why this answer is correct

The least possible Venn diagram for the given relation is as shown below :

  • Some Singers can be Musician.
  • Some Musician is doctor.
  • Some Doctor can be Singer.

Hence, the correct answer is "Option 4".

Question 115

Kolkata Police SI 2021• Test

If height of Mercury in a Barometer decreases rapidly it denotes

  1. AOption (a)

    chances of Sunny weather

  2. BOption (b)

    chances of storm

  3. COption (c)

    chances of clean weather

  4. DOption (d)

    chances of rain

View answer & explanation

Correct answer

Answer: (b)B.

chances of storm

Why this answer is correct

The correct option is chances of storm.

Key Points

  • The atmospheric pressure perfectly balances the weight of the mercury column in the barometer.
  • A drop in atmospheric pressure causes a drop in mercury levels to the point where the weight of the mercury column is once more equal to the altered atmospheric pressure.
  • The atmosphere is typically thin in low-pressure regions.
  • These places receive inward-moving winds.
  • Clouds and condensation are created as air rises.
  • This means that the chances of a storm are there.

Additional Information

Barometer:

  • An instrument known as a barometer is used to measure atmospheric pressure, also known as barometric pressure.
  • The air layers that surround Earth are known as the atmosphere.
  • Gravity drags that air to Earth, it exerts pressure on everything it touches.
  • This pressure is measured using barometers.

Atmospheric Pressure:

  • Everything you touch is pressed upon by the weighty air that surrounds you.
  • This pressure is referred to as air pressure or atmospheric pressure.
  • It is the force that the air above a surface applies to it while gravity pulls the surface toward Earth.

Question 116

Kolkata Police SI 2021• Test

Who wrote the play 'Mudrarakshasha'?

  1. AOption (a)

    Vishakhadatta

  2. BOption (b)

    Shudrak

  3. COption (c)

    Kalhan

  4. DOption (d)

    Kalidas

View answer & explanation

Correct answer

Answer: (a)A.

Vishakhadatta

Why this answer is correct

The correct answer is Vishakhadatta.

Key Points

  • The Mudrarakshasa is a Sanskrit-language drama by Vishakhadatta.
  • It tells the story of India's first king Chandragupta Maurya.
  • Although it is not entirely fake, the play is creative writing.
  • From the late fourth century through the seventh century CE, it has been dated.

Additional Information

  • A fascinating period in Indian history is depicted in Vishakadatta's political thriller Mudrarakshasa, which was published in the sixth century CE.
  • Chanakya, Chandragupta Maurya, and the Nandas ruled throughout this time period.
  • By this time, the final Nanda king has left the world, and Chandragupta and Chanakya in Kusumapura have seized control of his realm.
  • The little subordinate monarch Malayaketu left Chandragupta's court after his father was poisoned.
  • Despite his escape, Malayaketu still has the trustworthy and shrewd minister Rakshasa on his side.

Question 117

Kolkata Police SI 2021• Test

45 men can produce 10000 electric bulbs in 12 days in a co-operative concern. The concern got an order to produce 10000 electric bulbs in 9 days. How many more men would be employed to meet the order?

  1. AOption (a)

    55

  2. BOption (b)

    60

  3. COption (c)

    10

  4. DOption (d)

    15

View answer & explanation

Correct answer

Answer: (d)D.

15

Why this answer is correct

Given:

Number of men = 45

Number of days = 12

Number of electric bulbs = 10000

Work to be done in = 9 days

Concept used:

⇒ \({M1D1 \over W1} = {M2D2 \over W2}\)

Calculation:

Let 'x' be the number of more men required

Substitute the given values in the formula

⇒ \({(45)(12) \over 10000} = {(45 + x)(9) \over 10000}\)

⇒ \({(45)(12)} = {(45 + x)(9)}\)

⇒ \(540 = 405 + 9x\)

⇒ \(540 - 405 = 9x\)

⇒ \(135 = 9x\)

⇒ \(x = {135 \over 9}\)

⇒ \(x = 15\)

∴ The number of more men would be employed to meet the order is 15.

Question 118

Kolkata Police SI 2021• Test

The Hindalco Unit at Muri is located on the bank of which river?

  1. AOption (a)

    Subarnarekha

  2. BOption (b)

    Mahanadi

  3. COption (c)

    Tungabhadra

  4. DOption (d)

    Kangshawati

View answer & explanation

Correct answer

Answer: (a)A.

Subarnarekha

Why this answer is correct

The correct answer is Subarnarekha.

Key Points

  • India's first alumina refinery, Muri Works of Hindalco Industries Limited, was established in 1948 by the former Indian Aluminium Company (INDAL).
  • After acquiring INDAL in 2005, Hindalco consolidated the factory with itself.
  • The factory is situated near Chota Muri along the banks of the Swarnarekha River, 65 kilometres from Ranchi, the state capital of Jharkhand.
  • The Muri plant's initial installed capacity was 4 KTPA.
  • It has gone through several stages of debottlenecking and expansion over the years to reach its current capacity of 450 KTPA.

Important Points

  • For customers in the aluminium, metal, refractory, glass, and alum manufacturing industries, the refinery produces standard and special grades of alumina and alumina hydrate.
  • 334.2 acres are devoted to the plant and colony collectively.
  • A coal-based cogeneration power plant exists to continuously provide electricity to the employee housing colony and steam to the alumina refinery.

Question 119

Kolkata Police SI 2021• Test

A tea seller blends Tea A worth Rs. 250 per kg with Tea B worth Rs. 150 per kg in a ratio of 2 ∶ 5 and sells the mixed blend at Rs. 200 per kg. What will be his percentage of profit?

  1. AOption (a)

    10%

  2. BOption (b)

    12%

  3. COption (c)

    18%

  4. DOption (d)

    15%

View answer & explanation

Correct answer

Answer: (b)B.

12%

Why this answer is correct

Given:

Tea A = Rs. 250 per kg

Tea B = Rs. 150 per kg

Ratio = 2 : 5

Selling price = Rs. 200 per kg

Concept used:

Profit = Selling price - Cost price

Profit % = \( {Profit \over Cost ;price} \) × 100

Calculation:

Cost price = (250 × 2) + (150 × 5) = 500 + 750 = 1250

Selling price = 200 × (2 + 5) = 200 × 7 = 1400

Substitute the values in the formula

Profit = 1400 - 1250 

Profit = 150

Now,

Profit % = \( {Profit \over Cost ;price} \) × 100

Profit % = \( {150 \over 1250} \) × 100

Profit % = 12%

∴ The profit percentage of tea seller is 12%.

Question 120

Kolkata Police SI 2021• Test

Which of the following is a browser to access Dark Web?

  1. AOption (a)

    ios

  2. BOption (b)

    Google Chrome

  3. COption (c)

    Tor

  4. DOption (d)

    Linux

View answer & explanation

Correct answer

Answer: (c)C.

Tor

Why this answer is correct

The correct answer is Tor.

Key Points

  • The term "darknet" describes encrypted Internet networks that are not included in search engines like Google, Yahoo, or Bing.
  • It is a portion of the Internet that can only be accessed by specialised applications like Tor (The Onion Router) or I2P (Invisible Internet Project).
  • These are networks that can only be accessed with authorisation, specific software, and configurations.
  • These are not accessible to the broader Internet public.
  • Google chrome, ios, and Linux are the normal web surfaces.

Additional Information

  • This covers both safe locations like business websites and academic databases as well as those with shadier content like black markets, fetish communities, hacking, and piracy.
  • Dark net and dark web are sometimes used synonymously, but their meanings differ just enough.