NECO Physics Past Questions & Answers - Page 53

261.

If N.E.P.A. charges 65 kobo per kilowatt-hour for electricity supplied to consumers, what bill would an electric iron rated at 750 watts attract when used for 24 hours?

A.

N9.70

B.

N11.70

C.

N12.40

D.

N15.90

E.

N17.60

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

262.

When water is heated between 0°C and 4°C, it's density

A.

increases for a while and then decreases

B.

decreases for a while and then increases

C.

increases

D.

decreases

E.

remains constant.

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

263.

The lower and upper fixed points of a mercury-in-glass thermometer are marked X and 180 mm respectively. On a particular day the mercury meniscus in the thermometer rises to 60mm. If the corresponding reading on a Celsius scale is 20 ° C, what is the value X?

A.

6.0mm

B.

18.0mm

C.

30.0mm

D.

60.0mm

E.

120.0mm

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

264.

The speed of sound travelling in various media increases in the order:

A.

air, iron bar, water

B.

air, water, iron bar

C.

iron, bar water, air

D.

water, air, iron bar

E.

water, iron bar, air

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

265.

A 220 V, 60 Hz alternating current supply is connected to an inductor of 3.5H. What is the current passing through the inductor?

A.

0.0167 A

B.

0.1670 A

C.

1.6700 A

D.

16.7000 A

E.

167.0000 A

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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