Download App

MODEL PAPER 3 — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10ScienceMODEL PAPER 31 Mark
MCQ
Assertion (A): CFCs deplete the ozone layer.
Reason (R): CFCs are used as refrigerants and in fire extinguishers.
  • ✓
    Both A and R are true and R is the correct explanation of A
  • B
    Both A and R are true but R is not the correct explanation of A
  • C
    A is true but R is false.
  • D
    A is false but R is true.
✓

Answer

Correct option: A.
Both A and R are true and R is the correct explanation of A
(a) Both A and R are true and R is the correct explanation of A.
Explanation: The ozone layer is getting depleted at the higher levels of the atmosphere due to the effect of chlorofluorocarbons (CFCs) which are used as refrigerants and in fire extinguishers.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q" from MODEL PAPER 3→MODEL PAPER 3 — all question types→Science STD 10 question papers→CBSE Board STD 10 question papers→CBSE Board question paper generator→

Similar questions

Hydrolysis of water is :
→
When carrying out the starch test on a leaf, why is it important to boil the leaf in alcohol?
→
Fuel used in thermal power plants is:
→
Which of the following groups contain only biodegradable items?
a. Grass, flowers and leather
b. Grass, wood and plastic
c. Fruit peels, cake and lime-juice
d. Cake, wood and grass
→
What happens when magnesium ribbon is burned?
→
The organs which perform similar functions but have different basic structure are called:
→
What do you mean by wildlife conservation?
→
An aqueous solution with $pH-$ zero is :
→
Which compound has an addition reaction with $-$ chlorine?
→
Which of the following is acidic in nature?
→