UNN Physics 2019/2020 Past Questions

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

An object at the bottom of a pool 10m deep is seen by an observer as if it is 8m deep. What is the refractive index of the liquid?

A.0.25
B.0.20
C.1.25
D.0.8

An object is placed between 2 mirror inclined at an angle of 120° and facing each other. Determine the number of images observed in the 2 mirrors.

A.2
B.3
C.4
D.1

The force with which an object is attracted to the earth is its

A.acceleration
B.mass
C.gravity
D.weight

A ball of mass 10kg strikes a wall normally with a velocity 5ms^-1 and travels back with velocity.
calculate its impulse on the wall

A.0
B.25ms^-1
C.50ms^-1
D.100ms^-1

Calculate the velocity of the wave represented by the following wave represented by the following wave equation y= 20sin(60πx-0.5πx) if all the distance are in meters

A.30ms^-1
B.60ms^-1
C.80ms^-1
D.100ms^-1

When a velocity-time graph is a curve it means that we have ..........

A.a uniform acceleration
B.a non-uniform acceleration
C.a uniform velocity
D.a non-uniform velocity

A train with an initial velocity of 20ms^-1 is subjected to a uniform deceleration of 2ms^-2. The time required to bring the train to a complete halt is

A.5s
B.10s
C.20s
D.40s

A p-n junction diode is used as

A.a rectifier in a d.c. circuit
B.an amplifier in an a.c. circuit
C.a rectifier in an a.c. circuit
D.an amplifier in a d.c. circuit

What is the Celsius equivalent of 50.0° F?

A.10° C
B.20° C
C.30° C
D.40° C

How many atmospheres of pressure must a litre of gas, initially at a pressure of 1 atmosphere and temperature -20°C, be after it has been compressed to 1/2 litre at 40°C?

A.2.47 atm.
B.4.5 atm.
C.8.0 atm.
D.3.8 atm.

Complete the following statement: A temperature decrease of 30 C° is equal to a temperature decrease of

A.30 F
B.17 F.
C.30 K.
D.86 F

The resistance of a wire depends on

A.the length of the wire
B.The diameter of the wire
C.the temperature of the wire
D.all of the above.

A block weighing 15N rests on a flat surface and a horizontal force of 3N is exerted on it. Determine the fractional force on the block.

A.0.3N
B.0.5N
C.3.0N
D.5.0N

If the distance between two suspended masses 10kg each is tripled, the gravitational force of attraction between them

A.reduced by one-half
B.increased by one-third
C.decreased by one-third
D.decreased by one-ninth

In an a.c. circuit that contains only a capacitor, the voltage lags behind the current by

A.90°
B.180°
C.30°
D.60°