General Science - Physics MCQs - Set 7

1)   What will be the spring constant of each part if the spring of force constant k is divided in to n equal parts?

a. k
b. k/n
c. nk
d. kn
Answer  Explanation 

ANSWER: nk

Explanation:
If the spring of force constant k is divided in to n equal parts then spring constant of each part will become nk.

2)   What is the relationship between the spring constant k and the spring length in case of spring pendulum?

a. spring constant is inversely proportional to the spring length
b. spring constant is directly proportional to the spring length
c. spring constant is independent of the spring length
d. spring constant is twice the spring length
Answer  Explanation 

ANSWER: spring constant is inversely proportional to the spring length

Explanation:
No explanation is available for this question!

3)   For which of the following waves the Doppler effect holds true?

a. Sound waves
b. Electromagnetic waves
c. Both a and b
d. None
Answer  Explanation 

ANSWER: Both a and b

Explanation:
Doppler effect is a wave phenomenon and it holds not only for sound waves but also for electromagnetic waves. When we approach a stationary source of sound with high speed, the pitch of the sound heard appears to be higher than that of the source. As the observer recedes away from the source, the observed pitch (or frequency) becomes lower than that of the source. This motion-related frequency change is called Doppler effect.

4)   What is the speed of electromagnetic waves in vacuum?

a. 1000 m/s
b. 3 x 10⁸m/s
c. 300000 m/s
d. Different for different waves
Answer  Explanation 

ANSWER: 3 x 10⁸m/s

Explanation:
n vacuum, all electromagnetic waves have the same speed whose value is 299, 792, 458 m/s or nearly equal to 3 x 10⁸ m/s.

5)   What is the relation between Time period(T) and angular frequency(ω) of a wave?

a. T = 2π/ω
b. T = 2πω
c. T = π/2ω
d. T = ω
Answer  Explanation 

ANSWER: T = 2π/ω

Explanation:
Period T of oscillation of a wave is defined as the time any element of the medium takes to move through one complete oscillation. It is related to the angular frequency ω through the relation T = 2π/ω.

6)   Which of the following eaves will be produced on bombarding a metal target by high energy electrons?

a. Gamma rays
b. X rays
c. Infra red
d. Microwaves
Answer  Explanation 

ANSWER: X rays

Explanation:
One common way to generate X-rays is to bombard a metal target by high energy electrons. X-rays covers wavelengths from about 10–8 m (10 nm) down to 10–13 m (10–4 nm).

7)   In which of the following the sound cannot travel?

a. Solids
b. Liquids
c. Gases
d. Vacuum
Answer  Explanation 

ANSWER: Vacuum

Explanation:
Sound cannot travel in vacuum. Sound is a mechanical wave and needs a material medium like air, water, steel etc. for its propagation.

8)   What is the time taken by two consecutive compressions or rarefactions to cross a fixed point in a sound wave known as?

a. Amplitude
b. Time period
c. Angular Frequency
d. Angular Displacement
Answer  Explanation 

ANSWER: Time period

Explanation:
The time taken by two consecutive compressions or rarefactions to cross a fixed point is called the time period of the wave.

9)   What is the relationship between the frequency and the pitch of a sound wave?

a. Higher the frequency, higher the pitch
b. Lower the frequency, higher the pitch
c. Pitch is not dependant on the frequency
d. None of the above
Answer  Explanation 

ANSWER: Higher the frequency, higher the pitch

Explanation:
How the brain interprets the frequency of an emitted sound is called its pitch. The faster the vibration of the source, the higher is the frequency and the higher is the pitch,

10)   What are infrasonic sounds?

a. Sounds of frequencies below 20 Hz
b. Sounds of frequencies above 20 Hz
c. Sounds of frequencies below 200 Hz
d. Sounds of frequencies above 20 Hz
Answer  Explanation 

ANSWER: Sounds of frequencies below 20 Hz

Explanation:
Sounds of frequencies below 20 Hz are called infrasonic sound or infrasound.

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