Physics Mock 2016

Question 1 of 50

The distance between two successive crests is the

Question 2 of 50

At a junction, 3 A and 2 A flow in. The current flowing out is

Question 3 of 50

X-rays are used in hospitals because they

Question 4 of 50

The sun is a

Question 5 of 50

The planet known as the "Red Planet" is

Question 6 of 50

Water waves slow down when they enter

Question 7 of 50

A charged particle in a uniform electric field experiences

Question 8 of 50

Telephone wires are left slack in hot weather so that they

Question 9 of 50

A gas expands more than a solid when heated because

Question 10 of 50

A Wheatstone bridge is used to measure

Question 11 of 50

Laser light is

Question 12 of 50

The induced e.m.f. in a coil increases if

Question 13 of 50

In an inelastic collision, kinetic energy is

Question 14 of 50

Full-wave rectification makes use of

Question 15 of 50

The heat needed to melt 0.5 kg of ice at 0 °C (L = 336,000 J/kg) is

Question 16 of 50

A temperature of 300 K in Celsius is

Question 17 of 50

Heat transfer through a vacuum occurs only by

Question 18 of 50

The specific latent heat of vaporisation of water is the heat needed to

Question 19 of 50

A gas at 2 atm occupies 3 litres. At constant temperature, at 6 atm it occupies

Question 20 of 50

A bimetallic strip bends on heating because the metals have different

Question 21 of 50

The frequency heard from an approaching ambulance siren is higher because of the

Question 22 of 50

A wave of frequency 50 Hz has wavelength 4 m. Its speed is

Question 23 of 50

An echo is heard 2 s after a shout at a cliff. Speed of sound 340 m/s. The cliff is

Question 24 of 50

The magnification when image distance is 30 cm and object distance is 10 cm is

Question 25 of 50

A 9 V battery with internal resistance 1 Ω is short-circuited. The current is

Question 26 of 50

A 4 Ω and 12 Ω resistor in parallel are in series with a 2 Ω resistor. The total resistance is

Question 27 of 50

Two 6 Ω resistors in parallel have an effective resistance of

Question 28 of 50

The power dissipated in a 4 Ω resistor carrying 3 A is

Question 29 of 50

Three 2 Ω resistors in parallel have equivalent resistance

Question 30 of 50

After 4 half-lives, the percentage of a radioactive sample remaining is

Question 31 of 50

Alpha particles are

Question 32 of 50

When ²³⁸U emits an alpha particle, its mass number becomes

Question 33 of 50

Gamma rays are deflected in a magnetic field

Question 34 of 50

Beta particles are

Question 35 of 50

The threshold frequency is the

Question 36 of 50

A metal rod 2 m long expands by 0.4 mm when heated by 20 K. Its linear expansivity is

Question 37 of 50

An object 15 cm from a concave mirror of focal length 10 cm forms an image at

Question 38 of 50

Light travels from air into glass of refractive index 1.5. Its speed in glass is

Question 39 of 50

The critical angle for glass of refractive index 1.5 satisfies sin c =

Question 40 of 50

An object is placed 10 cm from a concave mirror of focal length 20 cm. The image is

Question 41 of 50

A string vibrating in its fundamental mode has length 0.5 m. The wavelength is

Question 42 of 50

The power of a lens of focal length 25 cm is

Question 43 of 50

A cell of e.m.f. 3 V and internal resistance 1 Ω is connected to a 5 Ω resistor. The current is

Question 44 of 50

A transformer has 100 primary and 500 secondary turns. With 240 V input the output is

Question 45 of 50

The cost of running a 2 kW heater for 3 hours at GH¢1.50 per kWh is

Question 46 of 50

A galvanometer is converted to an ammeter by connecting a

Question 47 of 50

A galvanometer is converted to a voltmeter by connecting a

Question 48 of 50

The mass defect of a nucleus is 0.03 u. The binding energy is about (1 u = 931 MeV)

Question 49 of 50

A radioactive sample has a half-life of 5 days. The fraction remaining after 20 days is

Question 50 of 50

After beta emission, the atomic number of a nucleus