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Physics Past Questions and Answers

Jamb Physics Questions

Question 1906:

Which of the following statements is correct about a machine?

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A Efficiency of a machine is always greater than I
B Efficiency decreases with an increase in friction
C Velocity ratio depends on friction
D Mechanical advantage increases with an increase in friction

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Question 1907:

The instrument used to view stars is the

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A Prism binoculars
B Telescope
C Film projector
D Microscope

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Question 1908:

What is the angular magnification of a telescope having objective and eyepiece lenses of a focal lengths 30cm and 3cm respectively?

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A 60
B 10
C 30
D 90

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Question 1909:

A wire of length 10m is cooled from 50^oC to 10^oC. Calculate the decrease in the length of the wire. [c = 3 x 10^-5K^-1]

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A 1.8 x 10^-4m
B 1.5 x 10^-4m
C 1.5 x 10^-3m
D 1.8 x 10^-3m

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Question 1910:

When an athlete perspires after running, he loses heat through

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A Evaporation
B Conduction
C Radiation
D Convection

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