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2021 - JAMB Physics Past Questions and Answers - page 3

21

A lead bullet of mass 0.05kg is fired with a velocity of 200ms\(^{-1}\) into a block of mass 0.95kg. Given that the lead block can move freely, the final kinetic energy after impact is?

A

50J

B

100J

C

150J

D

200J

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22

A ball of mass 0.1kg is thrown vertically upwards with a speed of 10ms\(^{-1}\) from the top of a tower 10m high. Neglecting air resistance, its total energy just before hitting the ground is? (Take g = 10ms\(^{-2}\))

A

5J

B

10J

C

15J

D

20J

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23

A car of mass 800kg attains a speed of 25m/s in 20secs. The power developed in the engine is?

A

1.25 x 10\(^{4}\)W

B

2.50x 10\(^{4}\)W

C

1.25 x 10\(^{6}\)W

D

2.50 x 10\(^{6}\)W

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24

When the breaks in a car are applied, the frictional force on the tyres is...?

A

a disadvantage because it is in the direction of the motion of the car

B

a disadvantage because it is in the opposite direction of the motion of the car

C

an advantage because it is in the direction of the motion of the car

D

an advantage because it is in the opposite direction of the motion of the car

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25

If the stress on a wire is 10\(^{7}\)NM\(^{-2}\) and the wire is stretched from its original length of 10.00m to 10.05m. The young's modulus of the wire is?

A

5.0 x 10\(^{-4}\)Nm\(^{-2}\)

B

5.0 x 10\(^{-5}\)Nm\(^{-2}\)

C

2.0 x 10\(^{-8}\)Nm\(^{-2}\)

D

2.0 x 10\(^{9}\)Nm\(^{-2}\)

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26

A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.

A

\(\frac{5}{3}\)

B

\(\frac{4}{3}\)

C

\(\frac{3}{4}\)

D

\(\frac{7}{10}\)

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27

When the temperature of a liquid increases, its surface tension

A

decreases

B

increases

C

remains constant

D

increases then decreases

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28

A gas at a volume of V\(_{0}\) in a container at pressure p\(_{0}\) is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A

\(\frac{p_{0}} {5}\)

B

\(\frac{4p_{0}}{5}\)

C

p\(_{0}\)

D

5P\(_{0}\)

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29

A piece of substance of specific heat capacity 450Jkg\(^{-1}\)k\(^{1}\) falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms\(^{-2}\)]

A

\(\frac{2}{9}\)ºC

B

\(\frac{4}{9}\)ºC

C

\(\frac{9}{2}\)ºC

D

\(\frac{9}{4}\)ºC

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30

I. A liquid boils when its saturated vapor pressure is equal to the external pressure
II. Dissolved substances in pure water lead to an increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decreases the boiling point 

Which of the above combinations are peculiarities of the boiling point of a liquid?

A

I, II and III only

B

I, II, III, and IV

C

I, II, and IV

D

II, III, and IV

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