CAPF (AC) 2019 (Paper-1) (Question 1-50)

Total Questions: 50

31. When a longitudinal wave moves through a certain medium, the quantity which is transmitted through the medium is

(a) material of the medium only
(b) energy only
(c) both material of the medium and energy
(d) none of the above

Correct Answer: (b) energy only

Solution:When a longitudinal wave moves through a certain medium only energy is transmitted through the medium.

32. The number of neutrons inside the nucleus of the element Uranium-235 is

(a) 235
(b) 92
(c) 143
(d) 51

Correct Answer: (c) 143

Solution:The Atomic number of Uranium - 235 is 92.

Number of neutrons = Mass number - Atomic number

Hence the number of neutrons will be 235 - 92 - 143

33. A snowboard pulled up by a tow rope travels at the rate of 5 m/s up a mountain. If 3000 watt of power is used, what force was applied to it?

(a) 50 N
(b) 100 N
(c) 600 N
(d) 15000 N

Correct Answer: (c) 600 N

Solution:Power = Work ÷ Time

Or, Power = Force × displacement ÷ Time

Or, Power = Force × Velocity

Or, Force = Power ÷ Velocity = 3000/5 = 600

Hence the force will be 600 N

34. Which one of the following is NOT true for an electromagnetic wave?

(a) Electromagnetic wave transports energy and momentum
(b) Electromagnetic wave can be polarized and reflected
(c) Electromagnetic wave is longitudinal
(d) Electromagnetic wave propagation is described by the varying electric and magnetic fields

Correct Answer: (c) Electromagnetic wave is longitudinal

Solution:An electromagnetic wave is not longitudinal but transverse in nature. It means the electric and magnetic fields oscillate in a plane that is perpendicular to the direction of propagation of the wave.

35. Which one of the following is NOT an electromagnetic wave?

(a) Light wave
(b) Radio wave
(c) Sound wave
(d) Micro wave

Correct Answer: (c) Sound wave

Solution:Sound waves are not electromagnetic wave. Electromagnetic waves can travel through a vacuum and transverse in nature which is not the property displayed by sound waves.

36. Brilliance of diamond is due to

(a) interference of light
(b) diffraction of light
(c) polarization of light
(d) total internal reflection of light

Correct Answer: (d) total internal reflection of light

Solution:Brilliance of diamonds is due to total internal reflection of light. It occurs when the light rays travel from a more optically denser medium to a less optically denser medium and the angle of incidence is greater than the critical angle then the light is reflected back to the reflected back into the denser medium.

37. Which of the following conditions is/are essential for wheat cultivation?

1. Optimum temperature during growing period is around 30°C

2. A frost-free period of about 100 days

3. Light clay or heavy loam soil

Select the correct answer using the code given below :

(a) 1, 2 and 3
(b) 1 and 2 only
(c) 2 and 3 only
(d) 1 only

Correct Answer: (c) 2 and 3 only

Solution:The following conditions are essential for wheat cultivation:

Ideal temperature is between 10º- 15º C at time of souring and 21º - 26ºC at time of harvesting.
It requires brost free period of about 100 days.
It requires 50 - 75 cm of annual rainfall.
The most suitable soil is well drained fertile 100 mg soil and dayey soil.

38. Gwadar port is located in

(a) Pakistan
(b) Iran
(c) India
(d) Sri Lanka

Correct Answer: (a) Pakistan

Solution:The Gwadar port is located on the South-western coast of Balochistan, Pakistan. It is important part of China Pakistan Economic Corridor and China's One Belt One Road project and Maritime Silk Road Project.

39. North-west part of the Indian peninsula was converted into a great centre of vulcanicity in

(a) the end of Cretaceous period
(b) the mid of Cretaceous period
(c) the start of Cretaceous period
(d) the whole of Cretaceous period

Correct Answer: (a) the end of Cretaceous period

Solution:The north-west part of the Indian peninsula was converted into a great center of vulcanicity in the end of the Cretaceous period.

40. What is the natural number n for which 3⁹ + 3¹² + 3¹⁵ + 3ᵐ is a perfect cube of an integer?

(a) 10
(b) 11
(c) 13
(d) 14

Correct Answer: (d) 14

Solution:3⁹ + 3¹² + 3¹⁵ + 3ᵐ⁺⁹ = 3⁹ × (1 + 3³ + 3⁶ + 3ᵐ)

(where, m = n - 9 )

Since, 3⁹ is a cube of 3³ , let we find the value of 3ᵐ which will result in a cube for expression

(1 + 3³ + 3⁶ + 3ᵐ) = (1 + 27 + 729 + 3ᵐ)

When m = 1 ⇒ 757 + 3¹ = 760

This is not a cube.

When m = 2 ⇒ 757 + 3² = 766

This is not a cube.

When m = 3 ⇒ 757 + 3³ = 784

This is not a cube.

When n = 4 ⇒ 757 + 3⁴ = 838

This is not a cube.

When n = 5 ⇒ 757 + 3⁵ = 1000

This is (10)³

Hence, m = 5 ⇒ n = 9 + m = 14

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CAPF (AC) 2019 (Paper-1) (Question 1-50)

31. When a longitudinal wave moves through a certain medium, the quantity which is transmitted through the medium is

32. The number of neutrons inside the nucleus of the element Uranium-235 is

33. A snowboard pulled up by a tow rope travels at the rate of 5 m/s up a mountain. If 3000 watt of power is used, what force was applied to it?

34. Which one of the following is NOT true for an electromagnetic wave?

35. Which one of the following is NOT an electromagnetic wave?

36. Brilliance of diamond is due to

37. Which of the following conditions is/are essential for wheat cultivation?

38. Gwadar port is located in

39. North-west part of the Indian peninsula was converted into a great centre of vulcanicity in

40. What is the natural number n for which 3⁹ + 3¹² + 3¹⁵ + 3ᵐ is a perfect cube of an integer?

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