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JAMB Physics

Page 23

An object of mass 20kg is released from a height of 10m above the ground level. The kinetic energy of that object just before it hits the ground is

a.

4000 J

b.

2000 J

c.

500 J

d.

200 J

A sonometer wire of length 100 cm, under a tension of 10 N, has a frequency of 250 Hz. Keeping the length of the wire constant, the tension is adjusted to produce a new frequency of 350 Hz. The new tension is

a.

5.1 N

b.

19.6 N

c.

14.0 N

d.

7.1 N

Mercury is suitable as a barometric fluid because it

a.

Expands uniformly

b.

Is several times denser than water

c.

Is opaque

d.

Is a good conductor of heat

An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?

a.

There is a drop in the level of water in the glass due to condensation on its outside

b.

The water level remains the same

c.

The water in the glass overflows

d.

The level of water drops because melted ice occupies less volume

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