NECO Past Questions and Answers - Page 245

1,221.

Which device does NOT make use of the magnetic effects of an electric current?

A.

hot-wire ammeter

B.

moving-coil ammeter

C.

moving-coil loudspeaker

D.

moving-iron ammeter

E.

telephone earpiece

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,222.

The energy stored in a capacitor of capacitance 5 μF is 40J. What is the voltage applied across its terminals?

A.

4V

B.

8V

C.

16V

D.

200V

E.

4000V

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,223.

Which is a fundamental unit?

A.

ampere

B.

joule

C.

Newton

D.

ohm

E.

watt

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

1,224.

An object 8cm in front of a plane mirror moves at a speed of 6cm s^-1 away from the mirror. What will be the distance separating the object and the image after 2s?

A.

8cm

B.

12cm

C.

20cm

D.

28cm

E.

40cm

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

1,225.

An electric heater takes 4A when operated on a 250V supply. What is the cost of the electricity consumed at 10k per kWh when the heater is used for 5 hours?

A.

10k

B.

50k

C.

N1.00

D.

N5.00

E.

N10.00

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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