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

Question: The element of an electric stove made:

• 1. nicrome
• 2. magnalium
• 3. copper
• 4. invar

Question: Which hydrocarbon has the Empirical Formula C6H6:

• 1. Octane
• 2. Gasoline
• 3. Benzene
• 4. Glucose

Question: which of the following represent a chemical change:

• 1. Sublimation of Iodine
• 2. Heating a platinum wire in a bunsen flame
• 3. Heating of Mercuric oxide powder
• 4. Evaporation of Alcohol

Question: The SI unit of “pressure” is _________.

• 1. Henry
• 2. Pascal
• 3. Joule
• 4. Tesla

Question: During winter in cold countries, the __________ is mixed to melt the ice on the icy roads.

• 1. Water
• 2. Salt
• 3. Chlorine
• 4. Carbon dioxide

Question: German silver is an alloy of?

• 1. Silver and some impurities
• 2. Copper, zinc and Nickel
• 3. Refined silver Nickel
• 4. Nickel and copper

Question: When a ship enters a sea from a river, its portion under water will:

• 1. Decrease
• 2. show no change
• 3. Increase
• 4. increase and decrease alternately