UNICAL Physics 2009/2010 Past Questions

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

Calculate the power-rating of a heating element which melted in 20g of ice at 0°C and raised the temperature of the resulting water to 60°C in 2 minutes. (specific latent heat of fusion of ice = 340J/g, specific heat capacity of water 4.2J/g/0C)

A.5.9kw
B.98.6kw
C.107w
D.42w

If a man cannot see objects very close to him the following can be used to correct the problem

A.convex lens
B.convex mirror
C.concave lens
D.concave mirror

When the bob of a simple pendulum is at its highest displacement, one of the following happens

A.kinetic energy is maximum
B.potential energy is maximum
C.total energy is zero
D.momentum is maximum

When the atmospheric pressure is very low in a given location, boiling point of water

A.increase
B.decreases
C.remains the same
D.cannot boil

Which of these statements is correct about cathode rays. They are fast moving

A.atoms
B.neutrons
C.electrons
D.ions

Which of the following has the highest surface tension.

A.soapy water
B.cold water
C.warm water
D.salt warm

A truck travelling with a velocity of 40m/s applies the brakes and comes to a halt after 20s. What is the distance travelled by the truck before coming to a halt?

A.40m
B.800m
C.400m
D.10m

If the linear expansivity of a metal rod is 4 × 10^-5 per °C, what will be new length of the rod if it is heated from 115°C to 95°C from its original length of 20cm

A.0.064cm
B.0.64cm
C.20.64cm
D.20.064cm

44kj heat was used in raising the temperature of 2kg of paraffin oil from 360k to 370k. Calculate the specific heat capacity of paraffin oil.

A.2.2J/kg/K
B.2.2 × 10³J/kg/K
C.2.2 × 10⁵J/kg/K
D.220 J/kg/K

A simple machine overcomes a load 4000N when a force of 200N is applied. If the velocity ratio of the machine is 25, calculate the efficiency of the machine.

A.1.25%
B.80%
C.125%
D.0.8%