Physics - Questions and Answers, General Study (GK)

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451.

When the same note is played on a sitar and a flute, the sound produced can be distinguished from each other because of the difference in

(a)Pitch and loudness

(b)Quality only

(c)Pitch, loudness and quality

(d)Loudness only

Comment

Answer is: B

452.

The patient is asked to drink Barium sulphate for examining the stomach by X-rays because X-rays are

(a)Less absorbed by heavy atoms

(b)More absorbed by heavy atoms

(c)Reflected by heavy atoms

(d)Reflected by light atoms

Comment

Answer is: B

453.

Consider the following statements
1. Light of longer wavelength is scattered much more than the light of shorter wavelength.
2. The speed of visible light in water is 0. 95 times the speed in vacuum.
3. Radio waves are produced by rapidly osculating electrical currents.
4. To detect the over speeding vehicles, police use the Doppler effect of reflected short radiowaves.
Which of the statements are correct?

(a)1 and 2

(b)1 and 3

(d)4 and 3

Comment

Answer is: D

454.

The quality of musical notes depends upon

(a)Its frequency

(b)Its amplitude

(c)Its harmonic content

(d)The waves velocity

Comment

Answer is: C

455.

A wave undergoes reflection from a rigid boundary. One of its characteristic parameters that changes is

(a)Frequency

(b)Phase

(c)Velocity

(d)Wavelength

Comment

Answer is: B

456.

X-rays are used for study of crystal structure because

(a)X-rays are completely absorbed by the Crystal

(b)The wavelength of X-rays is of the same order of magnitude as the interatomic spacing in crystals

(c)The wavelength of X-rays is very small in comparison with the inter atomic spacing in crystal

(d)The crystals are completely transparent to X-rays

Comment

Answer is: B

457.

The technique used to transmit audio signal in television broadcast is

(a)Amplitude modulation

(b)Frequency modulation

(c)Pulse code modulation

(d)Time division multiplexing

Comment

Answer is: B

458.

When the frequency distribution is normal

(a)Mean, mode and median are identical

(b)Median, mode and mean are all different from one another

(c)Mean is greater than mode

(d)Mean is greater than median

Comment

Answer is: A

459.

Stationary waves are so called because in them

(a)Same occurs no flow of energy

(b)The interference effect cannot be observed

(c)The particles of the medium are not disturbed at all

(d)The particles of the medium do not execute SHM

Comment

Answer is: C

460.

When two sound waves are superimposed, beats are produced when they have

(a)Different velocities

(b)Different phases

(c)Different frequencies

(d)Different amplitudes and phases

Comment

Answer is: C

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Physics - Questions and AnswersPage 46

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