UNIPORT Physics 2020/2021 Past Questions

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

The expansion of solids can be considered as disadvantage in the

A.balance wheel of water
B.fitting of wheels on our vehicle
C.fire alarm
D.thermostat

Impulse has the same dimension as one of these physical quantities:

A.surface tension
B.momentum
C.surface tension
D.pressure

A force of 100 N is needed to lift a load of 50 N using a pulley system whose velocity ratio is 4. The efficiency of the system is __.

A.0.5%
B.8%
C.12.5%
D.50%

Calculate the heat required to convert 10g of ice at -10°C to water at 50°C. The specific heat capacity of ice and water are 2100J/kgK and 4200 J/kgK respectively. The latent heat of fusion of ice is 3.4 x 10⁵JK^-1

A.2.10kJ
B.4.20kJ
C.3.21kJ
D.5.71 kJ

A metal cube of surface area 0.135m² has a density of 9.0x103kgm^-3. The mass of the cube is

A.1.2 x 10³kg
B.66.7kg
C.30.4kg
D.11.5kg

An object of mass 4kg moves round a circle of radius 6 m with a constant speed of 12 ms^-1. calculate the angular velocity.

A.2 rads^-1
B.4 rads^-1
C.6 rads^-1
D.8 rads^-1

A gas has a volume of 100cm³ at 270°C. If it is heated to temperature T unit a final volume of 120 cm³ is attained. Calculate T.

A.33°C
B.60°C
C.87°C
D.114°C

The differences observed in solids, liquids and gases may be accounted for by ___.

A.the different molecules in each of them
B.the spacing and forces acting between the molecules
C.their melting points
D.their relative masses

What is the total charge produced in a circuit when a current of 4 A flows for 2 minutes?

A.400 coulombs
B.360 coulombs
C.360 joules
D.480 coulombs

A 2m uniform conductor with resistivity P = 2x 10^-1 m conducts a current of 0.1 A when connected across a 6v battery. What is the cross-sectional area A of the conductor?

A.6.7 x 10^-3 m
B.0.67 x 10^-2 m
C.6.7 10^-2 m
D.0.67 x 10^-3 m