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Question 251

WB Police SI 2023• Test

If a wall clock takes 10 seconds to strike 10, how long will it take to strike 12? (in seconds)

  1. AOption (a)

    \(9\frac{2}{9}\)

  2. BOption (b)

    \(11\frac{2}{9}\)

  3. COption (c)

    \(12\frac{2}{9}\)

  4. DOption (d)

    \(10\frac{2}{9}\)

View answer & explanation

Correct answer

Answer: (c)C.

\(12\frac{2}{9}\)

Why this answer is correct

Let's analyze the problem. When a clock strikes 10, it chimes 10 times. The time between the first and the tenth chime is 10 seconds. This means that there are 9 intervals between the 10 chimes. 

Let's denote the time between chimes as t  seconds. Therefore, we can write the equation:

 9t = 10 

Now, when the clock strikes 12, there are 11 intervals between the 12 chimes. We can find the total time it takes to strike 12 by using the equation:

11t = Total time to strike 12

Let's calculate the total time it takes to strike 12.

The total time it takes for the clock to strike 12 is 110/9 seconds. This can be converted to a mixed number for easier understanding. Let me do that.

The total time it takes for the clock to strike 12 is \(12\frac{2}{9}\) seconds.

Question 252

WB Police SI 2023• Test

What is the color of potassium permanganate solution?

  1. AOption (a)

    Red

  2. BOption (b)

    Violet

  3. COption (c)

    Yellow

  4. DOption (d)

    Orange

View answer & explanation

Correct answer

Answer: (b)B.

Violet

Why this answer is correct

The correct answer is Violet.

 Key Points

  • Potassium permanganate is a chemical compound with the formula KMnO4.
  • In an aqueous solution, it appears as a deep violet or purple color.
  • It is often used as a disinfectant and in water treatment processes.
  • Red, yellow, and orange are not the colors of a potassium permanganate solution.

Question 253

WB Police SI 2023• Test

The speed ratio of Rajdhani Express and Purba Express is 4:3. If Purba Express covers a distance of 72 km in 4 hours, how much distance (km) will Rajdhani Express cover in 3 hours?

  1. AOption (a)

    24

  2. BOption (b)

    60

  3. COption (c)

    72

  4. DOption (d)

    48

View answer & explanation

Correct answer

Answer: (c)C.

72

Why this answer is correct

Solution:

The speed ratio of Rajdhani Express and Purba Express is 4:3. This means that for every 4 km that Rajdhani Express travels, Purba Express travels 3 km.

We can use this information to find the speed of Rajdhani Express.

Purba Express covers a distance of 72 km in 4 hours, so its speed is 72 km / 4 hours = 18 km/hour.

Since the speed ratio of Rajdhani Express and Purba Express is 4:3, the speed of Rajdhani Express is (4/3) * 18 km/hour = 24 km/hour.

Now that we know the speed of Rajdhani Express, we can use it to find the distance it will cover in 3 hours.

The distance covered by Rajdhani Express in 3 hours is 24 km/hour * 3 hours = 72 km.

So, Rajdhani Express will cover a distance of 72 km in 3 hours

Question 254

WB Police SI 2023• Test

Women's U-19 T-20 World Cup 2023 was organized in which country?

  1. AOption (a)

    India

  2. BOption (b)

    England

  3. COption (c)

    South Africa

  4. DOption (d)

    Sri Lanka

View answer & explanation

Correct answer

Answer: (c)C.

South Africa

Why this answer is correct

The correct answer is South Africa.

Key Points

  • ICC Women's Under-19 Cricket World Cup 2023 tournament was hosted by South Africa.
  • The 2023 edition of the tournament was the first edition of the ICC Women's Under-19 Cricket World Cup.
  • It was held from 14-29 January 2023.
  • India became the first-ever ICC Under-19 Women’s T20 World Cup winners, after a comprehensive, seven-wicket victory over England in Potchefstroom.
  • India won by seven wickets against England, with 36 balls to spare.

Additional Information

  • South Africa:
  • South Africa is a country on the southernmost tip of the African continent.
  • It has the most UNESCO World Heritage Sites in Africa.
  • According to the 2011 census, the two most spoken first languages are Zulu (22.7%) and Xhosa (16.0%).
  • Capitals: Cape Town, Pretoria, Bloemfontein
  • President: Cyril Ramaphosa
  • Population: 5.94 crores (2021) World Bank
  • Currency - South African rand
  • ICC:
  • The International Cricket Council is the global governing body of cricket.
  • It was founded as the Imperial Cricket Conference in 1909 by representatives from Australia, England and South Africa.
  • It was renamed the International Cricket Conference in 1965, and took up its current name in 1987.
  • Headquarters: Dubai, United Arab Emirates
  • Chairman: Greg Barclay
  • General Manager: Wasim Khan​

Question 255

WB Police SI 2023• Test

Which of the following governor-general is called the pioneer of railway construction in India?

  1. AOption (a)

    Lord Curzon

  2. BOption (b)

    Lord Dalhousie

  3. COption (c)

    Lord Mayo

  4. DOption (d)

    Lord Cornwallis

View answer & explanation

Correct answer

Answer: (b)B.

Lord Dalhousie

Why this answer is correct

The correct answer is Lord Dalhousie.

Key Points

  • Lord Dalhousie's real name was James Andrew Ramsay, who served as Governor-General of India from 1848 to 1856.
  • "Lord Dalhousie" is known as " Father of Indian Railways".
  • He was born on 22 April 1812 in the United Kingdom.
  • Lord Dalhousie is credited for the introduction of the Indian Railway in India.​

Additional Information

  • Some of the important organizations founded by him include - 
  • Central Public Work Department
  • Tamil Nadu Public Work Department
  • The first passenger train between Bori Bunder ( Mumbai) and Thane on 16th April 1853.
  • This train was operated by three locomotives named Sahib, Sultan, and Sindh.

Question 256

WB Police SI 2023• Test

If the code for ACNE is 3, 7, 29, 11, then what will be the code for BOIL?

  1. AOption (a)

    5, 31, 21, 25

  2. BOption (b)

    5, 29, 19, 25

  3. COption (c)

    5, 29, 19, 27

  4. DOption (d)

    5, 31, 19, 25

View answer & explanation

Correct answer

Answer: (d)D.

5, 31, 19, 25

Why this answer is correct

The logic followed here is : Each letter in the word is coded by adding Its positional value to the next letter's positional value in English alphabet series.

A (1 + 2) C (3 + 4) N ( 14 + 15 ) E ( 5 + 6) → 3, 7, 29, 11

Similarly,

B ( 2 + 3 ) O ( 15 + 16 ) I ( 9 + 10 ) L ( 12 + 13 ) → 5, 31, 19, 25

Question 257

WB Police SI 2023• Test

'Oryza Sativa' is the scientific name of which of the following?

  1. AOption (a)

    Mango

  2. BOption (b)

    Wheat 

  3. COption (c)

    Maize

  4. DOption (d)

    Paddy

View answer & explanation

Correct answer

Answer: (d)D.

Paddy

Why this answer is correct

The correct answer is Paddy.

 Key Points

  • 'Oryza Sativa' is the scientific name for paddy or Asian rice.
  • It is one of the most widely consumed staple foods for a large part of the world's human population, especially in Asia.

 Additional Information

  • The scientific name for mango is 'Mangifera indica.'
  • Wheat is scientifically known as 'Triticum aestivum.'
  • Maize is known scientifically as 'Zea mays.'

Question 258

WB Police SI 2023• Test

If '+' means '\(\div \)', '-' means '\(\times \)' ,'\(\div \)' means '-' and '\(\times \)' means '+', then 

67 \(\times\) 119 + 17 - 27 \(\div\) 259 = ?

  1. AOption (a)
    • 13
  2. BOption (b)

    3

  3. COption (c)

    7

  4. DOption (d)
    • 3
View answer & explanation

Correct answer

Answer: (d)D.
  • 3

Why this answer is correct

According to the given information:

SymbolsMeaning
+÷
-×
÷-
×+

 

By substituting the above symbols in the given equation, we get

⇒67 + 119 ÷  17 × 27  - 259 

⇒ 67 + 7 × 27  - 259 

⇒ 67 + 189 - 259

⇒ 256 - 259

= - 3

Question 259

WB Police SI 2023• Test

Which country won the FIFA World Cup held in Qatar?

  1. AOption (a)

    Brazil

  2. BOption (b)

    Argentina

  3. COption (c)

    Spain 

  4. DOption (d)

    Croatia 

View answer & explanation

Correct answer

Answer: (b)B.

Argentina

Why this answer is correct

The correct answer is Argentina.

Key Points

  • Argentina defeated France 4-2 on penalties to win their third World Cup, after 36 years on 19 December 2022.
  • Croatia won the third place in FIFA World Cup 2022 by beating Morocco 2-1
  • Golden Ball was awarded to Lionel Messi.
  • He also got this award in 2014.
  • With eight goals, Kylian Mbappe was awarded the Golden boot.
  • Enzo Fernandez is awarded the Young Player of the Tournament award.
  • While the goalkeeper of the tournament was given to Emiliano Martinez.​

Additional Information

  • FIFA World Cup 2022 was held in Qatar.
  • The 2022 FIFA under-17 Women's World Cup was held in India and Spain won that tournament.
  • FIFA World Cup 2018 was held in Russia and France won that tournament.

Question 260

WB Police SI 2023• Test

Six people are sitting in a circle facing the center. A is facing B. B sits to the right of E and to the left of C. C, D are to the left of A. F is to the right of A. Then D changed their place with F and E with B. Now who are on both sides of C?

  1. AOption (a)

    B and D 

  2. BOption (b)

    B and E

  3. COption (c)

    E and F

  4. DOption (d)

    B and F

View answer & explanation

Correct answer

Answer: (c)C.

E and F

Why this answer is correct

Six people are sitting in a circle facing the center.

1. A is facing B

2. B sits to the right of E and to the left of C

3. C, D are to the left of A

4. F is to the right of A

5.  D changed their place with F and E with B.

E and F are on both side of C.