Physics Past Questions and Answers

The tyre pressure of a car was found to be 150cmHg in the morning at a temperature of 27°C. Hard driving in the afternoon raised the temperature of the tyres by 57°C. The tyre pressure had by the afternoon was

A Increased by 15.0cm Hg
B Decreased by 15.0cm Hg
C Increased by 22.50cm
D Decreased by 22.50cm Hg
E Remained constant

Question 7:

The echo of a sounder from the bottom of an ocean is heard 2.5 seconds later. If the speed of sound in water is 1,400ms^-1, the depth of the ocean is

A 1,750m
B 3,500m
C 1,400m
D 2,800m
E 2,100m

Question 8:

An electric iron is rated at 1000watts, 250v. The corresponding maximum resistance and accompanying current is

A 62.5A, 4.0\(\Omega\)
B 16.0A, 62.5\(\Omega\)
C 62.5A, 16.0\(\Omega\)
D 4.0A, 62.5\(\Omega\)
E 4.0A, 250\(\Omega\)

Question 9:

The force responsible for holding the moon in its orbit around the earth against the gravitational pull of the earth is

A Centrifugal
B Rotational
C Reaction
D Centripetal
E Tractional

Question 10:

A mango fruit drops from a branch 10m above the ground, just before hitting the ground its velocity is (g = 10ms^-2)

A 10âˆš2ms^-1
B 10ms^-1
C 100ms^-1
D 5âˆš2ms^-1
E 200ms^-1