1. Subatomic particles of atoms are ______.

A. Only protons

B. Only neutrons

C. Both protons and neutrons

D. Protons, electrons, and neutrons

Correct Answer: D. Protons, electrons, and neutrons

2. Which of the following is a good conductor of electricity?

A. Charcoal

B. Wood

C. Graphite

D. Diamond

Correct Answer: C. Graphite

3. The process involved in the production of iron from iron ore is:

A. Oxidation

B. Reduction

C. Electrolysis

D. Fractional distillation

Correct Answer: B. Reduction

4. The best conductor of heat among the following is ________.

A. Stainless Steel

B. Mercury

C. Water

D. Alcohol

Correct Answer: B. Mercury

5. Which gas makes up 95-97% of the atmosphere on Venus and Mars?

A. Oxygen

B. Carbon Dioxide

C. Water Vapor

D. Nitrogen

Correct Answer: B. Carbon Dioxide