Physics - Questions and Answers, General Study (GK)

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461.

A source of sound waves towards an observer

(a)The wavelength of sound in the medium towards the observer is decreased

(b)The frequency of the source is increased

(c)The velocity of the sound in the medium is increased

(d)The amplitude of vibration of the particles is increased

Comment

Answer is: A

462.

X-rays are heavily observed by lead atoms, but the obtain X-rays photograph of stomach Barium sulphate is usually given to the patient instead of lead salt, because

(a)Lead salts given fainter image

(b)Lead salts are more poisonous

(c)Barium salts reflect less

(d)Barium sulphate give brighter image

Comment

Answer is: B

463.

Consider the following statements
1. In sound waves the vibrations are perpendicular to the direction in which the Wave Travels.
2. Sound waves are elastic waves.
which of the statement given above is correct

(a)Only 1

(b)Only 2

(c)Both 1 and 2

(d)Neither 1 nor 2

Comment

Answer is: B

464.

When an aeroplane attains a speed higher than the speed of sound in air a loud bang is heard, this is because

(a)Its wings vibrate so violently that the bang is heard

(b)It explodes

(c)It produces a shock wave which is received as the bang

(d)The normal engine noises undergo a Doppler Shift to generate the bang

Comment

Answer is: C

465.

When a source of sound is in motion towards a stationary observer, effect observed it

(a)Decrease in the velocity of sound only

(b)Increase in the frequency of sound only

(c)Increase in the velocity of sound only

(d)Increase in both the velocity and the frequency of sound

Comment

Answer is: B

466.

The Waves moving from a sitar to a listener in the air are

(a)Transverse stationary

(b)Transverse progressive

(c)Longitudinal progressive

(d)Longitudinal stationary

Comment

Answer is: C

467.

What is pulse?

(a)Wave of long time period

(b)Wave of very long wavelength

(c)Wave of a short duration

(d)None of the above

Comment

Answer is: D

468.

A progressive wave or travelling wave

(a)In that travelling in the + X-direction

(b)Is there travelling in either (+)ve X direction or (-)ve X-direction

(c)P is that travelling perpendicular to the x-aris

(d)None

Comment

Answer is: A

469.

Velocity of wave in a string (thread) is

(a)Directly proportional to its mass per unit length

(b)Inversely proportional to the mass per unit length

(c)Proportional to square root of mass per unit length

(d)None of the above

Comment

Answer is: D

470.

In an Electromagnetic wave,
1. Electric field and magnetic field are parallel to each other.
2. Electric field and magnetic field are perpendicular to each other.
3. Electric field and magnetic field both are perpendicular to direction to propagation of wave.

(a)1 and 2 correct

(b)All correct

(c)Only 2 correct

(d)2 and 3 are correct

Comment

Answer is: D

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Physics - Questions and AnswersPage 47

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