Selected MCQ

Current Question
Assertion: The moon appears bright at night. Reason: The moon has its own light.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: C
Explanation:
The moon appears bright, but it shines by reflecting sunlight, not by its own light.
Related Question 1
Assertion: A rainbow is seen when sunlight passes through raindrops. Reason: Raindrops refract, reflect, and disperse light.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: A
Explanation:
Rainbow formation is due to refraction, reflection, and dispersion in raindrops.
Related Question 2
Assertion: Birds have hollow bones. Reason: Hollow bones help reduce body weight for flight.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: A
Explanation:
Hollow bones are a flight adaptation because they reduce body weight.
Related Question 3
Assertion: Earth rotates on its axis. Reason: Rotation causes day and night.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: B
Explanation:
The reason states an effect of rotation, not why Earth rotates.
Related Question 4
Assertion: Plants need sunlight for photosynthesis. Reason: Photosynthesis helps plants prepare food.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: B
Explanation:
Both statements are true, but the reason does not explain why sunlight is needed.
Related Question 5
Assertion: Glass windows crack when heated unevenly. Reason: Uneven heating causes unequal expansion in different parts of the glass.
  • A. Both are true and the reason correctly explains the assertion
  • B. Both are true but the reason does not explain the assertion
  • C. Assertion is true but reason is false
  • D. Assertion is false but reason is true
Correct Answer: A
Explanation:
Unequal expansion creates stress in the glass and causes cracking.