Physics Past Questions and Answers

The inability of the eye to focus near objects is known as ____________

A Astigmatism
B Eye ring
C Hypermetropia
D Myopia
E Presbyopia

Question 142:

A platinum-resistance thermometer has a resistance of 4Ω at 0°C and 12Ω at 100°C. Assuming that the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

A 6.0Ω
B 6.42Ω
C 7.6Ω
D 8.4Ω
E 16.0Ω

Question 143:

Calculate the critical angle for light travelling from water to air. (Refractive index of water = 1.33)

A 36.9°
B 41.3°
C 48.8°
D 49.2°
E 51.4°

Question 144:

A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the ____________

A Charges generated by friction in the tanker are conducted to the earth
B Chain vibrates in resonance with the tanker’s engine
C Heat generated by friction in the engine is conducted to the earth
D Petrol tanker is balanced on the road
E Tanker does not exceed a certain speed limit

Question 145:

A transformer is required to give 120V from a 240V mains supply. If the primary has 5500 turns, how many turns has the secondary?

A 232
B 450
C 550
D 2750
E 11000