Physics Past Questions and Answers

Which of the following physical processes cannot be explained by the molecular theory of matter?

A Evaporation
B Thermal conduction
C Radiation of heat
D Convectional current of fliuds

Question 782:

A spring balance,which is suspended from the roof of a lift, carries a mass of 1kg at its free end. If the lift accelerates upwards at 2.5ms^-2, determine the reading on the spring balance. [g = 10ms^-2]

A 24.0N
B 12.5N
C 7.5N
D 4.0N

Question 783:

An object weight 10N immersed in a liquid displaces a quantity of the liquid. If the liquid displaced weighs 6N, determine the upthrust of the object

A 20N
B 10N
C 6N
D 4N

Question 784:

Which of the following statements about pressure is not correct? pressure

A Increases with an increase in surface area
B Decreases with an increase in surface area
C Increases with a decrease in surface area
D Increases with an increase in the applied force

Question 785:

The apparent weight of a body fully immersed in water is 32N and its weight in air is 96N. Calculate the volume of the body. [Density of water = 1000kgm^-3, g = 10ms^-2]

A 8.9 x 10^-3m³
B 6.4 x 10^-3m³
C 3.2 x 10^-3m³
D 3.0 x 10^-3m³