NECO Physics Past Questions & Answers - Page 8

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71.

The motion of the wheel of a bicycle moving on a smooth straight road is

A.

oscillatory and random

B.

oscillatory and translational

C.

rotational and oscillatory

D.

rotational and random

E.

rotational and translational

Correct answer is E

No explanation has been provided for this answer.

72.

Which of the following is NOT a component of a slide projector?

A.

Concave mirror

B.

Condenser

C.

Convex mirror

D.

light source

E.

Screen

Correct answer is A

You will find convex lenses in telescopes, microscopes, magnifying glasses, cameras, slide and movie projectors, and other instruments that use light to create an image

73.

A constant force acts on a body of mass 50kg and changes its speed from 20ms-1 to 90ms-1 in 10 seconds. Calculate the magnitude of the force applied.

A.

590N

B.

500N

C.

450N

D.

350N

E.

180N

Correct answer is D

No explanation has been provided for this answer.

74.

Three non-parallel coplanar forces which can be represented both in magnitude and direction by the three sides of a triangle taken in order will

A.

have any one force being the equilibrant of the other two

B.

make a body move randomly

C.

make a body oscillate

D.

move a body along a straight line

E.

rotate a body about its axis

Correct answer is A

No explanation has been provided for this answer.

75.

Radio receivers are tuned using

A.

electromagnets

B.

electric motors

C.

Inductors

D.

variable capacitors

E.

variable resistors

Correct answer is D

No explanation has been provided for this answer.

76.

An electric motor primary converts

A.

electrical energy to chemical energy

B.

electrical energy to heat energy

C.

electrical energy to mechanical energy

D.

mechanical energy to electrical energy

E.

mechanical energy to light energy

Correct answer is C

No explanation has been provided for this answer.

77.

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

Correct answer is D

No explanation has been provided for this answer.

78.

Which of the following radiations has the shortest wavelength?

A.

Infrared rays

B.

Light waves

C.

Microwaves

D.

Ultraviolet rays

E.

X-rays

Correct answer is E

No explanation has been provided for this answer.

79.

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

Correct answer is B

No explanation has been provided for this answer.

80.

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

Correct answer is E

No explanation has been provided for this answer.


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