Sounds waves and Motion MCQ question and answer with solution

61

Wave, speed, amplitude, wavelength and frequency all are called-

A) Chemical properties of wave B) Characteristics of wave C) Wave components D) Functions of wave

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Answer & Solution

Answer: Option B

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62

A particle is executing simple harmonic motion. Which one of the following statements about the acceleration of the oscillating particle is true?

A) It is always in the opposite direction to velocity B) It is proportional to the frequency of oscillation C) It is minimum when the speed is maximum D) It decreases as the potential energy increases

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Answer: Option C

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63

The wave length is usually indicated in the Greek Letter-

A) Gamma B) Lambda C) bita D) Alpha

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Answer: Option B

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64

Assertion (A) The velocity of sound in air increases due to the presence of moisture in it.
Reason (R) The presence of moisture in air lowers the density of air.

A) Both A and R are true and R is the correct explanation of A B) Both A and R are true, but R is not the correct explanation of A C) A is true, but R is false D) A is false, but R is true

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Answer: Option A

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65

Calculate the time period (in seconds) of a sound wave of wave length 5 metre travelling with a speed of 500 m/s.

A) 0.01 B) 2500 C) 0.02 D) 250

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Answer: Option A

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66

In which medium does sound travel at maximum speed?

A) Solid B) Fluid C) Equal motion in gases and liquids D) Gas

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Answer & Solution

Answer: Option A

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67

What is the relation between frequency and time period-

A) T = f B) T = 1 + f C) T = 1 - f D) $$T = \frac{1}{f}$$

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Answer & Solution

Answer: Option D

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68

In which of the following mediums does the sound travel fastest at a particular temperature?

A) Water B) Air C) Glasss D) Iron

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Answer: Option D

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69

Assertion (A): A jet aircraft moving at mach number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level.
Reason (R): The velocity of sound depends on the temperature of the surrounding medium.

A) Both (A) and (R) are true and (R) is the correct explanation of (A) B) Both (A) and (R) are true, but (R) is not the correct explanation of (A) C) (A) is true, but (R) is false D) (A) is false, but (R) is true

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Answer: Option D

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70

Match List I (Electromagnetic radiation) with List II (Approximate wavelength in metre) and select the correct answer:

List-I	List-II
a. Infrared radiation	1. 10^-12
b. X-rays	2. 10^-5
c. Ultraviolet radiation	3. 10^-10
d. Gamma rays	4. 10^-8

A) a-2, b-3, c-4, d-1 B) a-1, b-4, c-3, d-2 C) a-1, b-3, c-4, d-2 D) a-2, b-4, c-3, d-1

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Answer: Option A

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Sounds waves and Motion MCQ question and answer with solution | Physics Gk MCQs