Physics Mock 2017

Question 1 of 50

The earth wire in a plug is connected to the

Question 2 of 50

A Geiger–Müller tube is used to

Question 3 of 50

The SI unit of length is the

Question 4 of 50

A block of volume 50 cm³ and density 8 g/cm³ has mass

Question 5 of 50

A box of weight 600 N rests on an area of 2 m². The pressure it exerts is

Question 6 of 50

A swimming pool appears shallower than it is because of

Question 7 of 50

The magnetic poles of the earth are near the

Question 8 of 50

A loudspeaker converts

Question 9 of 50

The mass number of an atom is the number of

Question 10 of 50

Hooke's law states that extension is proportional to

Question 11 of 50

Two forces of 6 N and 8 N act in opposite directions. Their resultant is

Question 12 of 50

The half-life of a radioactive isotope is the time for

Question 13 of 50

Lubrication reduces

Question 14 of 50

An electric motor converts

Question 15 of 50

The cost of using a 2 kW heater for 5 hours at GH¢1.50 per kWh is

Question 16 of 50

A wire of resistance 10 Ω carries 2 A. The power dissipated is

Question 17 of 50

Soft iron is used for electromagnet cores because it

Question 18 of 50

A radioactive sample has an activity of 800 counts/min. After two half-lives the activity is

Question 19 of 50

When ²³⁸₉₂U emits an alpha particle, the new nucleus has mass number

Question 20 of 50

The branch of physics that deals with heat is

Question 21 of 50

A hydraulic press works because pressure in a liquid is

Question 22 of 50

Absolute zero is

Question 23 of 50

A convex mirror is used as a car's rear-view mirror because it

Question 24 of 50

A rainbow is formed by

Question 25 of 50

Light travels slowest in

Question 26 of 50

Silicon is a semiconductor because its conductivity

Question 27 of 50

An atom of ²³Na₁₁ has how many neutrons?

Question 28 of 50

A hydrometer is used to measure the

Question 29 of 50

Heat capacity is the heat needed to raise the temperature of

Question 30 of 50

Evaporation causes cooling because

Question 31 of 50

Charges on a conductor concentrate at

Question 32 of 50

Two capacitors of 2 μF and 3 μF in parallel have a total capacitance of

Question 33 of 50

Photoelectrons are emitted only if the light's frequency is above the

Question 34 of 50

At the highest point of its path, a projectile's vertical velocity is

Question 35 of 50

The force on a current-carrying wire in a magnetic field is greatest when the wire is

Question 36 of 50

The slope of a displacement–time graph gives

Question 37 of 50

A spring of constant 400 N/m is compressed 0.1 m. The energy stored is

Question 38 of 50

A uniform metre rule is balanced at the 50 cm mark. A 2 N weight at 20 cm is balanced by a weight at 80 cm of

Question 39 of 50

A net force of 20 N acts on a 4 kg mass. The acceleration is

Question 40 of 50

A pulley system lifts a 600 N load with an effort of 200 N. The mechanical advantage is

Question 41 of 50

An inclined plane 5 m long raises a load 1 m. Its velocity ratio is

Question 42 of 50

The heat needed to raise 2 kg of water by 10 °C (c = 4200 J/kg K) is

Question 43 of 50

A 0.2 kg ball hits a wall at 10 m/s and rebounds at 8 m/s. The change in momentum is

Question 44 of 50

A force of 6 N acts on a 2 kg body for 3 s from rest. The kinetic energy gained is

Question 45 of 50

A machine with velocity ratio 5 and efficiency 80% has mechanical advantage

Question 46 of 50

A pump lifts 100 kg of water through 10 m in 20 s (g = 10 m/s²). Its power is

Question 47 of 50

A spring extends by 4 cm under a load of 8 N. Its spring constant is

Question 48 of 50

The coefficient of friction is 0.4 for a 50 N block on a level floor. The limiting friction is

Question 49 of 50

A boy of mass 50 kg climbs 4 m in 10 s (g = 10 m/s²). His power is

Question 50 of 50

A balloon of volume 2 L at 27 °C is heated to 177 °C at constant pressure. The new volume is