Question: Nuclear power reactors are operated at low temperatures and consequently with lower efficiency because:

• 1. High pressure inside the reactor reduces the temperature
• 2. Uranium is difficult to heat
• 3. The walls of nuclear reactors cannot withstand high temperature
• 4. none of these

Question: Arrange these fertilizers according to the decreasing order of their nitrogen content I. Ammonium Sulphate, II Ammonium Nitrate, III Potassium Nitrate, IV Urea:

• 1. IV, II, III, I
• 2. IV, II, I, III
• 3. IV, III, II, I
• 4. II, IV, III, I

Question: Radio carbon dating process is used to known the age of:

• 1. Plants
• 2. Rocks
• 3. Fossils
• 4. all of these

Question: The internal antenna of a transistor set is made of:

• 1. Copper
• 2. iron
• 3. Ferro-chrom
• 4. Alnico

Question: The dynamo converts?

• 1. Mechanical Energy into electrical energy
• 2. Mechanical Energy into magnetic energy
• 3. Electrical energy into Mechanical energy
• 4. None of these

Question: Which metal is commonly used as an electromagnet?

• 1. Nickel
• 2. Copper
• 3. Iron
• 4. None of these

Question: The raw material used for the manufacture of Glass and Cement is?

• 1. Limestone
• 2. Gypsum
• 3. Washing soda
• 4. None of these

Question: The substances are radioactive, which have:

• 1. Electrons in their nuclei
• 2. Electrons removed from the outermost shell
• 3. Unstable nuclei
• 4. Nuclei with less number of neutrons

Question: Why is the light of an ordinary lamp hotter than that of the tube light?

• 1. It is due to ionization of gases
• 2. It is due to incandescence
• 3. Distribution of energy
• 4. None of these

Question: To clean the ice from the roads during winter season, which of the following is used?

• 1. Chlorine
• 2. Salt
• 3. Iodine
• 4. None of these