(a) Define Young modulus of elasticity;

(b) A spiral spring extends from a length of 10.0 cm to 10.01 cm when a force of 20 N is applied on it. Calculate the force constant of the spring.

Which of the following radiations have the highest frequency?

• A. Radio waves
• B. Light waves
• C. X-rays
• D. infra-red rays

How would the capacitance of a parallel plate capacitor be affected if the distance of separation of its plates is decreased? It will

• A. increase in value
• B. decrease slightly
• C. remain unchanged
• D. drop to zero

When blue and green colours of light are mixed, the resultant colour is

• A. cyan
• B. magenta
• C. black
• D. yellow

A platinum resistance thermometer has a resistance 4\(\Omega\) at 0°C and 10\(\Omega\) at 100°C. Assuming the resistance changes uniformly with temperature. Calculate the resistance of the thermometer when the temperature is 45°C.

• A. 14.0\(\Omega\)
• B. 6.7\(\Omega\)
• C. 3.2\(\Omega\)
• D. 2.7\(\Omega\)

A hypsometer is used for determining

• A. steam point
• B. relative humidity
• C. ice point
• D. relative density

The pair of physical quantities that are scalar only are ?

• A. volume and area
• B. moment and momentum
• C. length and displacement
• D. Impulse and time

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg1 Cº. Calculate the specific latent heat of fusion of ice.

• A. 9.0kj/kg
• B. 84.0kj/kg
• C. 134.0kj/kg
• D. 168.0kj/kg

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 m/s. The recoil speed of the machine gun is

• A. 0.5 m/s
• B. 1.5 m/s
• C. 1 m/s
• D. 2m/s

At 4°c, the volume of a fixed mass of water is?

• A) constant
• B) minimum
• C) maximum
• D) zero