If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

1.

The conclusive test for magnetism in a steel bar suspended horizontally at its midpoint is when the bar

A.

always settles in the magnetic N-S direction.

B.

is repelled by a magnet.

C.

always settles in the magnetic E-W direction

D.

is attracted by a magnet.

The conclusive test for magnetism in a steel bar suspended horizontally at its midpoint is when the bar always settles in the magnetic N-S (North-South) direction.

2.

Which of the following devices is associated with alternating currents only?

A.

Step-up transformer

B.

Induction coil

C.

Moving coil galvanometer

D.

The device associated with alternating currents (AC) only from the provided options is the step-up transformer. Step-up transformers are specifically designed to work with alternating currents and are used to increase voltage levels in AC systems.

3.

Which of the following equations is not a correct mirror formula? [The symbols have their usual meanings]

A.

N = $$\frac{360}{\theta}$$

B.

$$\frac{1}{f} = \frac{1}{u} + \frac{1}{v}$$

C.

m = $$\frac{v}{u}$$

D.

f = $$\frac{1}{D}$$

The equation f = $$\frac{1}{D}$$ is not a correct mirror formula

4.

Which part of the human eye performs the same function as the diaphragm in a lens camera?

A.

Choroid

B.

Retina

C.

Iris

D.

Cornea

The part of the human eye that performs a function similar to the diaphragm in a camera lens is the Iris.
Just like the diaphragm in a camera lens controls the amount of light entering the camera, the iris in the eye controls the amount of light that enters the eye by adjusting the size of the pupil. It can contract or expand to regulate the size of the pupil in response to varying light conditions, thus controlling the amount of light that reaches the retina at the back of the eye.

5.

The purpose of commutators in a direct current motor is to

A.

reverse the direction of the current after every half rotation

B.

increase the number of rotations per second

C.

enable a uniform couple to act on the coil.

D.

increase the efficiency of the motor.

The purpose of commutators in a direct current (DC) motor is to reverse the direction of the current after every half rotation.

WAEC