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2020 - JAMB Physics Past Questions and Answers - page 3

21

Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through 

A

220o

B

200o

C

210o

D

180o

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22

A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are 

A

0o and 0o

B

60o and 60o

C

90o and 90o

D

90o and 0o

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23

A hydrometer is an instrument for measuring the 

A

a depth of water of water in a vessel

B

relative density of a liquid by the method of flotation

C

relative density of a liquid by finding the apparent loss in weight

D

relative humidity of the air

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24

Consider the three forces acting at O and in equilibrium as shown in the figure. Which of the following equations is/are CORRECT?

I. P1 sin θ1 = p1 cos θ2

II. P3 = P1 cos θ4  + P2cos2

III. P1sinθ1=P2sinθ2

A

I only

B

II only

C

III only

D

I, II and III only

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25

The refractive index of a liquid is 1.5. If the velocity of light in a vacuum is 3.0 x 108ms1, the velocity of light in the liquid is 

A

1.5 x 108ms1

B

2.0 x 108ms1

C

3.0 x 108ms1

D

4.5 x 108ms1

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26

A ship travelling towards a cliff receives the echo of its whistle receives the echo of its whistle after 3.5 seconds. If the speed of sound in air under the prevailing conditions is 250ms1, how much closer is the ship to the cliff? 

A

10m

B

A. 350m

C

175m

D

125m

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27

Which of the following statements about defects of vision is/are CORRECT? 

I. For a long sighted person, close objects appear blurred

II. For a short sighted person, distant objects appear blurred 

III. Short sight is corrected by using a pair of converging lenses 

A

I only

B

II only

C

I and II only

D

II and III only

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28

Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media?

I. Light is passing from optical denser medium to optically less dense medium

II. Light is passing from optically less dense medium to optically denser medium to optically denser medium

III. Angle of incidence is greater 

IV. Angle of incidence is lesser 

 

A

I and II only

B

II only III only

C

III and IV only

D

I and III only

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29

The linear expansivity of brass is 2 x 105  oC1. If the volume of piece of brass is 2 x 10cm3 at 0oC. What will be its volume at 100oC? 

A

10.06cm3

B

10.04 cm3

C

10.02 cm3

D

10.06 cm3

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30

The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius? 

A

55.3oC

B

30.43oC

C

49.0oC

D

16.43oC

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