UNIZIK Physics 2015/2016 Day 2 Past Questions

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

The difference between x-rays and gamma rays is that

A.x-rays are more penetrating than gamma rays
B.x-rays are electromagnetic radiations while gamma rays are negatively charged radiations.
C.x-rays have higher frequencies than gamma rays
D.x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus.

As the pressure of a fluid increases, its viscosity

A.decreases
B.increases
C.increases then decreases
D.remains constant.

A force of 10N drags a mass of 10kg on a horizontal table with an acceleration of 0.2ms^-2. If the acceleration due to gravity is 10ms^-2, the coefficient of friction between the moving mass and the table is

A.0.02
B.0.08
C.0.20
D.0.80

Which of the following quantities are scalars.
I. Electrical potential
II. Torque
III. Momentum
IV. Kinetic energy

A.II and III only
B.I and II only
C.III and IV only
D.I and IV only

A 2000W electric heater is used to heat a metal object of mass 5kg initially at 10°C. If a temperature rise of 30°C is obtained after 10mins., the heat capacity of the material is

A.1.2 x 10⁴ J/C
B.6.0 x 10⁴ J/C
C.8.0 x 10³J/C
D.4.0 x 10⁴J/C

Which one of the following types of waves cannot travel through a vacuum?

A.Sound waves
B.Light waves
C.Infra-red waves
D.X-radiation
E.Radio waves

The water at the bottom of a waterfall is slightly warmer than that at the top because part of the

A.potential energy raises the water temperature
B.Water absorbs latent heat from the atmosphere
C.Kinetic energy is changed into internal energy
D.dropping mass of water increases the heat capacity

A 50W electric heater is used to heat a metal block of mass 5kg. If in 10minutes a temperature rise of 12°C is achieved, the specific heat capacity of the metal is

A.400J/KgK
B.500J/KgK
C.390J/KgK
D.130J/KgK

Which of the following is a derived unit?

A.Kilogramme
B.Metre
C.Kelvin
D.Newton

A force F is required to keep a 5kg mass moving round a cycle of radius 3.5m at a speed of 7m/s. What is the speed, if the force is tripled?

A.4.0m/s
B.6.6m/s
C.12.1m/s
D.21.0m/s