It is often observed that people living in hilly areas suffer from goitre because _____.

1. 1. of low atmospheric pressure there
   2. their diet and drinking water are deficient in iodine
   3. of low temperature
   4. of non-availability of sufficient amount of oxygen

When milk is churned, the cream separates from it due to the _____.

1. 1. Centrifugal force
   2. Cohesive force
   3. Frictional force
   4. Gravitational force

Which one of the following elements is found common in glass, cement, china clay and quartz?

1. 1. Calcium
   2. Carbon
   3. Silicon
   4. Aluminium

The filament of an electric bulb is made of _____.

1. 1. Nichrome
   2. Iron
   3. Carbon
   4. Tungsten

Which one of the following statements in not correct?

1. 1. All stainless steels are non-magnetic
   2. All metals are good electrical conductors
   3. All steels are magnetic
   4. All plastics are good insulators of heat

Non-stick kitchenware is coated with _____.

1. 1. Teflon
   2. Glass
   3. Silicon
   4. Graphite

Which gas is used in the preparation of soft drinks?

1. 1. Oxygen
   2. Nitrogen
   3. Carbon dioxide
   4. Halogens

A woman’s voice is shriller than a man’s due to _____.

1. 1. Higher frequency
   2. Higher amplitude
   3. Lower frequency
   4. Weak vocal chords

Which one of the following units represents the largest amount of energy?

1. 1. Calorie
   2. Erg
   3. Joule
   4. Electron volt

Which one of the following would give the highest energy per gram?

1. 1. Glucose
   2. Proteins
   3. Sucrose
   4. Fats