NECO Physics Past Questions & Answers - Page 18

86.

Which of the following is NOT a component of an a.c. generator?

A.

Armature

B.

Carbon brushes

C.

Magnet

D.

Slip ring

E.

Split rings

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

87.

Which of the following is a non-renewable energy source?

A.

Coal

B.

Hydro

C.

Ocean waves

D.

Solar

E.

Tides

View answer & explanation

Correct answer is A

Most non-renewable energy sources are fossil fuels: coal, petroleum, and natural gas

88.

The escape velocity of an object from the gravitational field of a planet

I. Increases with the mass of the object
II. Increases with the mass of the planet
III. Is smaller on the moon than on the earth. Which of the above statements is/are correct?

A.

I only

B.

II only

C.

I and II only

D.

II and III only

E.

I, II and III

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

89.

The mercury column in a simple mercury barometer is of height 5m above the mercury in a reservoir. If the tube is replaced with one whose radius is twice that of the first tube, what will be the height of the mercury column in the new tube?

A.

2.5m

B.

5.0m

C.

7.5m

D.

10.0m

E.

20.0m

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

90.

Calculate the peak voltage that could be obtained from a 220 V\(_{r.m.s}\)main supply.

A.

70.7V

B.

110.0V

C.

155.6V

D.

311.1V

E.

440.0V

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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