Butter is a colloid. It is formed when _____.

1. 1. water is dispersed in fat
   2. Fat is dispersed in solid casein
   3. Globulin is suspended in H₂O
   4. Fat globul are dispersed in water

Gunpowder consists of _____.

1. 1. 75% potassium nitrite + 15% charcoal + 10% sulphur
   2. 75% potassium nitrate + 10% charcoal + 15% sulphur
   3. 75% potassium nitrite + 8% charcoal + 17% sulphur
   4. None of the above

When nuclear energy is intended to be harnessed for generation of electricity, potentially destructive neutrons released in a nuclear reactor are absorbed by _____.

1. 1. Heavy water
   2. Long rods of Cd
   3. A pile of blocks made of graphite
   4. Cubical blocks of steel

Nuclear power reactors are operated at low temperatures and consequently with lower efficiency because _____.

1. 1. the walls of nuclear reactors cannot withstand high temperature
   2. nuclear heat is carried by ordinary steam
   3. uranium is difficult to heat
   4. high pressure inside the reactor reduces the temperature

Nameplates made of brass get discoloured in air because of the presence of _____ gases in the air.

1. 1. Oxygen
   2. Nitrogen
   3. Hydrogen sulphide
   4. Carbon dioxide

The characteristic odour of garlic is due to _____.

1. 1. Acetic acid
   2. A fluorine compound
   3. A chloro compound
   4. A sulphur compound

Which of the following group of compounds constitute carbohydrates?

1. 1. Fats and sugar
   2. Starch and sugar
   3. Fats, sugar and proteins
   4. Starch, sugar and proteins

What is the chemical name of Baking Soda?

1. 1. Potassium
   2. Sodium Carbonate
   3. Sodium Nitrate
   4. Sodium bicarbonate

X-rays are produced when a stream of electrons in an X-ray tube _____.

1. 1. hits the glass wall of the tube
   2. pass through a strong magnetic field
   3. strikes metal target
   4. None of the above

Which groups of elements in the periodic table shows highest first ionisation potential?

1. 1. Elements in the left hand top corner
   2. Elements in the left hand bottom corner
   3. Elements in the right hand top corner
   4. Elements in the right hand bottom corner