UNICAL Physics 2012/2013 Past Questions

Practice each question, then open it to see the full details.

One of the following true of Boyles law when the pressure of a given volume of gas increases

A.volume increases
B.the temperature increases
C.the volume decreases
D.the temperature decreases

If two resistors of 10Ω and 20Ω are connected in series and then placed in parallel with another 20Ω resistor. Calculate the effective resistance of the combination.

A.50Ω
B.12Ω
C.10Ω
D.0.02Ω

Converging lenses with focal length 4cm, 40cm and 4m are available for use. Which of them will you use as a magnifying glass?

A.4cm
B.40cm
C.4m
D.none of the above

A piece of aluminum of mass 0.6kg at a temperature of 100°C is placed in water of mass 0.4kg at a temperature of 10°C. If the final temperature of the mixture is 40°. Find the specific heat capacity of aluminum if that of water is 4200J/kg/°C

A.960 j/kg/°C
B.908 j/kg/°C
C.1860 j/kg/°C
D.1680 j/kg/°C

Hardness of x-rays is a measure of its

A.intensity
B.density
C.penetration power
D.picture it produces

The half-life of a radioactive substance if 2s. Calculate the decay possible if it

A.0.635s
B.0.347s
C.0.151s
D.0.576s

A body moves with a constant speed but has an acceleration. This is possible if it

A.moves in a straight line
B.moves in a circle
C.is oscillating
D.in an equilibrium

A 500kg truck moving with a velocity of 6m/s collides with a stationary 100kg car. The truck and the car move together after collision. What is their common velocity?

A.5m/s
B.10m/s
C.30m/s
D.1m/s

The process by which a metal heated to a high temperature gives off electrons from its surface is known as

A.radioactive emission
B.field emission
C.photoelectric emission
D.thermionic emission

A total internal reflection occurs in the glass-air boundary when the angle of incidence is

A.greater than the right angle
B.greater than the critical angle
C.greater than the angle of prism
D.greater than the angle of deviation