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Learn POLICE CONSTABLE MCQs with answers [Page 1 of Department 49]

Mr. Dubey • 51.17K Points
Coach

1) Which of the following represents the speed of a sound wave?

(A) wavelength x frequency

(B) 2 x wavelength x frequency

(D) (wavelength x frequency)/2

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Correct Answer - Option (A)

Explanation :
The speed of sound is defined as the distance which a point on a wave, such as a compression or a rarefaction, travels per unit time. It is represented by s = wavelength x frequency.

Mr. Dubey • 51.17K Points
Coach

2) What is the measure of the response of the ear to the sound known as?

(A) Pitch

(B) Intensity

(D) Amplitude

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Correct Answer - Option (C)

Explanation :
Loudness is a measure of the response of the ear to the sound. Even when two sounds are of equal intensity, we may hear one as louder than the other simply because our ear detects it better.

Mr. Dubey • 51.17K Points
Coach

3) In which of the following cases Doppler effect is not seen?

(A) When the velocity of source and listener is equal to or greater than the sound velocity

(B) When source and listener moves in opposite direction

(D) None of the above

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Correct Answer - Option (A)

Explanation :
If the velocity of source and listener is equal to or greater than the sound velocity then Doppler effect is not seen.

Mr. Dubey • 51.17K Points
Coach

4) Which of these parts of the ear responds to sound waves like a microphone’s diaphragm?

(A) eardrum

(B) lobe

(D) pinna

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Correct Answer - Option (A)

Explanation :
When a compression of the medium reaches the eardrum the pressure on the outside of the membrane increases and forces the eardrum inward. Similarly, the eardrum moves outward when a rarefaction reaches it. In this way the eardrum vibrates.

Mr. Dubey • 51.17K Points
Coach

5) What is the relationship between Kelvin scale temperature (T) and Celsius scale temperature (tc)?

(A) T = tc + 273.15

(B) T = tc – 273.15

(D) T = tc – 100

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Correct Answer - Option (A)

Explanation :
The size of unit in Kelvin and Celsius temperature scales is the same. So, T = tc + 273.15.

Yashika • 3.75K Points
Extraordinary

6) Indian Institute of Technology, Kharagpur was established in which year?

(A) 1952

(B) 1951

(D) 1954

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Correct Answer - Option (B)

Explanation :
Indian Institute of Technology Kharagpur is the first IIT to be established in India in 1951. It is one of the oldest technical institutes in West Bengal. Bidhan Chandra Roy insitsted Nehru Cabinet to establish the first IIT in West Bengal because of heavy population concentration in the state.

Kanak Sharma • 5.38K Points
Tutor III

7) A group of 8 bits is known as a

(A) byte

(B) kilobyte

(D) megabit

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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

Kanak Sharma • 5.38K Points
Tutor III

8) Reusable optical storage will typically have the acronym

(A) CD

(B) DVD

(D) RW

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Correct Answer - Option (D)

No Explanation found. Add Explanation and get +2 points.

Kanak Sharma • 5.38K Points
Tutor III

9) A group of 8 bits is known as a __________

(A) byte

(B) kilobyte

(D) megabit

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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

Kanak Sharma • 5.38K Points
Tutor III

10) Which of the following is a class of computers based on model?

(A) Digital Computer

(B) Hybrid Computers

(D) AT Computers

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Correct Answer - Option (A)

No Explanation found. Add Explanation and get +2 points.

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