Physics Mock 2022

Question 1 of 50

Gaps are left between lengths of railway line to

Question 2 of 50

X-rays are used in hospitals mainly to

Question 3 of 50

The Sun is

Question 4 of 50

Which planet is closest to the Sun?

Question 5 of 50

What is the frequency of the mains supply in Ghana?

Question 6 of 50

An a.c. generator changes

Question 7 of 50

Which instrument measures the internal diameter of a test tube?

Question 8 of 50

A body moves with a uniform velocity of 5 m/s for 8 s. What distance does it cover?

Question 9 of 50

Which is a scalar quantity?

Question 10 of 50

The SI unit of momentum is

Question 11 of 50

A body of mass 2 kg is at a height of 10 m. What is its potential energy?

Question 12 of 50

Heat travels from the sun to the earth by

Question 13 of 50

A bimetallic strip is used in a thermostat because

Question 14 of 50

Water has its greatest density at

Question 15 of 50

Kirchhoff's first (current) law states that at a junction

Question 16 of 50

X-rays are produced when

Question 17 of 50

Splitting a heavy nucleus, such as uranium-235, into smaller nuclei is

Question 18 of 50

Einstein's equation E = mc² shows that

Question 19 of 50

A light-year is a unit of

Question 20 of 50

The theory that the universe began from an extremely hot, dense state and has been expanding since is the

Question 21 of 50

What is the power of a converging lens of focal length 25 cm?

Question 22 of 50

A magnifying glass is a

Question 23 of 50

Laser light differs from ordinary light because it is

Question 24 of 50

The period of a simple pendulum depends on

Question 25 of 50

In an elastic collision,

Question 26 of 50

A half-wave rectifier uses

Question 27 of 50

A bridge rectifier uses

Question 28 of 50

In a power supply, a capacitor placed across the output of a rectifier

Question 29 of 50

A car decelerates uniformly from 20 m/s to rest in 4 s. What is its deceleration?

Question 30 of 50

The time a stone takes to fall freely from rest through 45 m is

Question 31 of 50

A 60 kg boy climbs stairs 5 m high in 10 s. What is his power?

Question 32 of 50

A machine has an efficiency of 75% and a velocity ratio of 4. Find its mechanical advantage.

Question 33 of 50

Which class of lever has the load between the fulcrum and the effort?

Question 34 of 50

The principle of moments states that for equilibrium,

Question 35 of 50

A spring extends by 2 cm under a load of 4 N. What extension will a load of 10 N produce, within the elastic limit?

Question 36 of 50

A radio station broadcasts at 100 MHz. The wavelength is (c = 3 × 10⁸ m/s)

Question 37 of 50

A steel rod 1 m long at 20 °C is heated to 120 °C. If α = 1.2 × 10⁻⁵ /K, the new length is

Question 38 of 50

In a balanced Wheatstone bridge, P = 4 Ω, Q = 8 Ω and R = 6 Ω. The unknown S is

Question 39 of 50

Hard X-rays differ from soft X-rays because they have

Question 40 of 50

An inductor of 0.1 H on a 50 Hz supply has a reactance of about

Question 41 of 50

A series circuit has R = 30 Ω and XL = 40 Ω. The impedance is

Question 42 of 50

Two coherent sources produce an interference pattern. A dark fringe occurs where the path difference is

Question 43 of 50

In Young's double slit, fringe spacing increases when

Question 44 of 50

An electron accelerated through 100 V gains kinetic energy of

Question 45 of 50

A potentiometer wire of 100 cm balances a 1.5 V cell at 60 cm. Another cell balances at 80 cm. Its e.m.f. is

Question 46 of 50

The energy released when 0.001 kg of mass is converted entirely is (c = 3 × 10⁸ m/s)

Question 47 of 50

Red-shift of light from distant galaxies indicates that

Question 48 of 50

A star more massive than about 8 solar masses ends its life as a

Question 49 of 50

The resonant frequency of an LC circuit is given by

Question 50 of 50

A lens of power −2.5 D is