Physics Past Questions and Answers

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

Question 82:

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

Question 83:

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

Question 84:

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.

Question 85:

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