Daily Olympiad: Science - Metals and Non-Metals [20260512]

Challenge yourself with today's CBSE practice! This test covers 'Metals and Non-Metals' for Science (Grade 8). Level: Easy | Duration: 30 mins.

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1. Which metal is a liquid at room temperature?

Solution
Correct: B
Mercury is the only metal that exists in liquid form at room temperature due to its unique atomic structure and bonding.

2. Which of the following is a non-metal?

Solution
Correct: C
Sulfur is a non-metal because it is brittle, does not conduct electricity, and lacks metallic luster, unlike the metallic elements listed.

3. Which metal is most commonly used for making electrical wires?

Solution
Correct: A
Copper is widely used for electrical wires because it is a good conductor of electricity, ductile, and cost-effective compared to silver or gold.

4. Which of the following is a property of non-metals?

Solution
Correct: C
Non-metals are typically brittle because their atomic structure does not allow them to deform under pressure like metals.

5. Which metal reacts vigorously with water to form hydrogen gas?

Solution
Correct: B
Sodium is a highly reactive metal that reacts violently with water, releasing hydrogen gas and forming sodium hydroxide.

6. Which of the following is a metalloid?

Solution
Correct: B
Silicon is a metalloid because it exhibits properties of both metals and non-metals, such as semi-conductivity and limited malleability.

7. What is the chemical symbol for iron?

Solution
Correct: A
The chemical symbol for iron is derived from its Latin name, 'Ferrum,' which is abbreviated as 'Fe' on the periodic table.

8. When a metal reacts with dilute hydrochloric acid, what gas is released?

Solution
Correct: B
Metals react with dilute hydrochloric acid to produce hydrogen gas due to the replacement of hydrogen ions by metal atoms.