Question: 1st period of documents in periodic table consist of only:

• 1. Hydrogen
• 2. Hydrogen & oxygen
• 3. Hydrogen and helium
• 4. Hydrogen and nitrogen

Question: How many main types of steel?

• 1. One
• 2. Two
• 3. Three
• 4. Four

Question: Heavy water is the oxide of:

• 1. Tritium
• 2. Pretium
• 3. Deuterium
• 4. none

Question: Fluorescent tubes and thermometer are made of?

• 1. Mercury
• 2. Hydrogen
• 3. Nitrogen
• 4. Oxygen

Question: Boiling of egg is a change which is:

• 1. Chemical
• 2. Physical
• 3. Both
• 4. None

Question: Aluminum composition on Earth.

• 1. 2.59%
• 2. 1.59%
• 3. 3.59%
• 4. None

Question: After persistent decay, radium would be finally changes into:

• 1. Steel
• 2. Brass
• 3. Lead
• 4. Hydrogen

Question: Permanent hardness of water cannot removed by:

• 1. Adding caustic soda
• 2. Distillation
• 3. Addind soda
• 4. Boiling

Question: Rusting of Iron involves __?

• 1. Reduction
• 2. Decomposition
• 3. Displacement
• 4. Oxidation

Question: Sodium by carbonate is used as:

• 1. Sodium
• 2. Backing soda
• 3. Sugar industry
• 4. None