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2016 - JAMB Physics Past Questions and Answers - page 3

21

A metre rule is pivoted at its mid-point with a vertical force of 10N hanging from the distance 30cm from the mid-point. At what distance must a 15N force hang to balance the ruler horizontally?

A
30cm
B
10cm
C
20cm
D
25m
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22

A projectile is fired from the ground level with a velocity of 300ms-1 at an angle of a 30o to the horizontal.

Calculate the time taken to reach the maximum height?

[g = 10ms-2]

A
30s
B
20s
C
25s
D
15s
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23

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

A
40s
B
10s
C
20s
D
5s
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24

Which of the following electromagnetic waves has the shortest wavelength?

A
Visible Light
B
Ultraviolet rays
C
Infrared rays
D
Gamma rays
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25

A radioactive isotope has a decay constant of 10-6s-1.

Calculate its half - life?

A
5.93 x 106s
B
6.93 x 107s
C
6.93 x 109s
D
5.93 x 107s
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26

Which of the following waves is both transverse and mechanical?

A
Water waves
B
Radio waves
C
Sound waves
D
X-rays
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27

Calculate the temperature of 6 moles of an ideal gas at a pressure of 7.6 x 106Nm-2 with a volume of 10-3m3.

[R = 8.3jmol-1K-1]

A
201oC
B
126oC
C
153oC
D
185oC
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28

The relative density of a liquid is the ratio of the

A
Mass of water to the mass of an equal volume of liquid
B
Upthrust in the liquid to the upthrust in water
C
Density of water to the density of the liquid
D
Upthrust in water to the upthrust in the liquid
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29

What will happen to the pressure of a gas if its temperature is reduced to -273oC?

A
It will decrease
B
it will drop to zero
C
It will increase
D
It will remain constant
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30

Which of the following does Not use magnetic effect of current to function?

A
Lead acid accumulator
B
An electric bell
C
A moving coil galvanometer
D
A telephone receiver
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