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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

2,926.

The pitch of an acoustic device can be increased by

A.

increasing the frequency

B.

increasing the amplitude

C.

decreasing the loudness

D.

decreasing the intensity

Correct answer is A

No explanation has been provided for this answer.

2,927.

The difference between sound waves and light waves is that sound waves

A.

are transverse while light waves are longitudinal

B.

require a medium to travel while light waves does not

C.

can be diffracted but light waves cannot

D.

cannot be reflected but light waves can

Correct answer is B

No explanation has been provided for this answer.

2,928.

The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?

A.

7500m

B.

300m

C.

75m

D.

15m

Correct answer is B

λ1F1 = λ2F2

1500 x 200000 = 1000000 x λ2

λ2 = 300m

2,929.

Which of the following is the exclusive property of a transverse wave?

A.

diffraction

B.

refraction

C.

compression

D.

polarization

Correct answer is D

No explanation has been provided for this answer.

2,930.

A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?

A.

58oC

B.

62oC

C.

64oC

D.

76oC

Correct answer is D

100oC ....100cm

60oC ....60cm

40oC .... 0cm

θ4010040 = 6001000

θ = 76oC