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CBSE Board Science Quiz Questions and Answers for Class 10

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CBSE Board Science Quiz Questions and Answers for Class 10

 

1. Due to the presence of which of the following gases in air, brass gets tarnished in air?

  1. an oxygen
  2. Hydrogen sulfide
  3. carbon dioxide
  4. Nitrogen

Answer: B

 

2. Which of the following is a non-metal which remains liquid at room temperature?

  1. Phosphorus
  2. Bromine
  3. chlorine
  4. helium

Answer: B

 

3. Magnesium ribbon is rubbed before burning because it has a coating of

  1. Basic magnesium carbonate
  2. Basic magnesium oxide
  3. Basic magnesium sulphide
  4. Basic magnesium chloride

Answer: A

 

4. Oxidation is a process which involves

  1. Addition of oxygen
  2. Addition of hydrogen
  3. Removal of oxygen
  4. Removal of hydrogen

Answer: A

 

5. The process of reduction involves

  1. Addition of oxygen
  2. Addition of hydrogen
  3. Removal of oxygen
  4. Removal of hydrogen

Answer: B

 

6. Chlorophyll is a naturally occurring chelate compound in which central metal is

  1. Copper
  2. Magnesium
  3. Iron
  4. Calcium

Answer: B

 

7. The chemical formula for water is

  1. NaAlO2
  2. H2O
  3. Al2O3
  4. CaSiO3

Answer: B

 

8. The gas usually filled in the electric bulb is

  1. Nitrogen
  2. Hydrogen
  3. Carbon dioxide
  4. Oxygen

Answer:  A

 

9. Give the ratio in which hydrogen and oxygen are present in water by volume.

  1. 1:2
  2. 1:1
  3. 2:1
  4. 1:8

Answer: A

 

10. Quartz crystals normally used in quartz clocks etc. is chemically

  1. Silicon dioxide
  2. Germanium oxide
  3. A mixture of germanium oxide and silicon dioxide
  4. Sodium silicate

Answer: A

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CBSE Board Science Quiz Questions and Answers for Class 10