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1.

A piece of radioactive material contains 1000 atoms. If its half-life is 20 seconds, the time taken for 125 atoms to remain is

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A.

20 seconds

B.

40 seconds

C.

60 seconds

D.

80 seconds


2.
When a brick is taken from the earth's surface go the moon, its mass
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A.
remains constant
B.
reduces
C.
increases
D.
becomes zero.

3.

The resultant of two forces is 50N. If the forces are perpendicular to each other and one of them makes an angle of 30º with the resultant, find its magnitude.

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A.

100.0N

B.

57.7N

C.

43.3N

D.

25.0N.


4.
The pair of physical quantities that are scalar only are
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A.
volume and area
B.
moment and momentum
C.
length and displacement
D.
impulse and time.

5.
A simple pendulum of length 0.4m has a period of 2s. What is the period a similar pendulum of length 0.8m at the same place?
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A.
8s
B.
4s
C.
2J2s
D.
J2s.

6.

A train with an initial velocity of 20ms-1 is subjected to a uniform deceleration of 2m-2. The time required to bring the train to a complete halt is

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A.

5s

B.

10s

C.

20s

D.

40s.


7.

Calculate the apparent weight loss of man weighing 70kg in an elevator moving downwards with an acceleration of 1.5ms-2.

[g = 10ms-2]

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A.

686N

B.

595N

C.

581N

D.

105N.


8.

A piece of cork floats in a liquid. What fraction of its volume will be immersed in the liquid?

[density of the cork = 0.25 x 103kg-3, density of the liquid = 1.25 x 103kgm-3]

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A.

0.8

B.

0.5

C.

0.2

D.

0.1


9.

An object is moving with a velocity of 5ms-1. At what height must a similar body be situated to have a potential energy equal in value with kinetic energy of the moving body?

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A.

25.0m

B.

20.0m

C.

1.3m

D.

1.0m


10.

If a pump is capable of lifting 5000kg of water through a vertical height at 60m in 15min, the power of the pump is

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A.

2.5 x 105Js-1

B.

2.5 x104Js-1

C.

3.3 x 103Js-1

D.

3.3 x 102Js-1


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