The approximate intensity level of the sound which can cause damage to the ear drum is _____.

1. 1. 20 dB
   2. 60 dB
   3. 100 dB
   4. 160 dB

A man is standing on a weighing machine in a lift which is moving. The weighing machine will show minimum reading when the lift is moving _____.

1. 1. upward with uniform speed
   2. downward with uniform acceleration
   3. upward with uniform acceleration
   4. in a free fall due to failure of the lift mechanism

A slow-running pendulum clock can be speeded up by _____.

1. 1. 1. Reducing the length of the rod
      2. Reducing the weight of the bob
      3. Increasing the length of the rod
      4. Increasing the weight of the rod

Which gas is commonly used in balloons and airships?

1. 1. Hydrogen
   2. Helium
   3. Carbon
   4. Hydrogen Sulphide

Radioactivity was first discovered by _____.

1. 1. Henry Becquerel
   2. Pasteur
   3. Newton
   4. Watson

The working principle of a washing machine is _____.

1. 1. Reverse osmosis
   2. Dialysis
   3. Diffusion
   4. Centrifugation

The major component of honey is _____.

1. 1. Glucose
   2. Maltose
   3. Fructose
   4. Surcose

The main chemical substance present in the bones and teeth of animals is _____.

1. 1. Calcium Phosphate
   2. Sugar
   3. Sodium Chloride
   4. Calcium Sulphate

Water pour beyond the dew point result in _____.

1. 1. Precipitation
   2. Hailstorm
   3. Condensation
   4. Formation of ice

An instrument to detect the purity of milk is _____.

1. 1. Manometer
   2. Lactometer
   3. Hygrometer
   4. Sonometer