NECO Physics Past Questions & Answers - Page 16

76.

Which of the following statements is/are correct? Sound waves travel through

I. air
II. vacuum
III.Water

A.

II only

B.

I and II only

C.

II and III only

D.

I and III only

E.

I, II, and III

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

77.

Which of the following radiations has the shortest wavelength?

A.

Infrared rays

B.

Light waves

C.

Microwaves

D.

Ultraviolet rays

E.

X-rays

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

78.

Which of the following is/are longitudinal wave(s)?

I. Light waves from the sun
II. Sound waves in the air
III. Waves on a vibrating string

A.

I only

B.

II only

C.

I and II only

D.

I and III only

E.

II and III only

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

79.

A radio station broadcasts at a frequency of 400KHz. If the speed of the wave is 3.0 ×10-8 ms-1, calculate the wavelength of the radio wave.

A.

1.3 × 10²m

B.

3.0 × 10²m

C.

2.4 × 10²m

D.

5.0 × 10²m

E.

7.5 × 10²m

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

80.

A box is pulled a distance s along a smooth horizontal floor by a force of magnitude F, inclined at an angle θ to the horizontal. The work done is

A.

Fs cos θ

B.

Fs cosec θ

C.

Fs sec θ

D.

Fs sin θ

E.

Fs tan θ

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

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