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Science Assertion (A) & Reason (B) MCQ

Motion and Time · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 6 questions.

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Assertion (A) & Reason (B) MCQ

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6 questions · timed · auto-graded

MCQ 11 Mark
Assertion (A) The distance covered by an object in unit time is called its speed.
Reason (R) Faster vehicles take less time to cover a certain distance as compare to slower vehicle.
  • A
    Both A and R are true and R is the correct explanation of A
  • ✓
    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: B.
Both A and R are true but R is not the correct explanation of A.
B
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MCQ 21 Mark
Assertion (A) The time taken by a pendulum to complete one oscillation is called its time period.
Reason (R) Time period of a simple pendulum does not depend upon the length of pendulum.
  • A
    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.
  • ✓
    A is true but R is false.
  • D
    A is false but R is true.
Answer
Correct option: C.
A is true but R is false.
C
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MCQ 31 Mark
Assertion (A) Speedometer is a device used to measure the speed of vehicle.
Reason (R) Speed is the total time taken divided by total distance covered by an object.
  • A
    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.
  • ✓
    A is true but R is false
  • D
    A is false but R is true.
Answer
Correct option: C.
A is true but R is false
(C) A is true but R is false
Speed is the total distance covered divided by total time taken by an object and speed is measured by speedometer.
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MCQ 41 Mark
Assertion (A) A simple pendulum is an example of non-periodic motion.
Reason (R) A simple pendulum does to and fro motion which is known as oscillatory motion.
  • A
    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
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(D) A is false but R is true.
A simple pendulum is an example of periodic motion.
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MCQ 51 Mark
Assertion (A) Speed of a vehicle in traffic jam is uniform.
Reason (R) When an object moves with constant speed, then its speed is uniform.
  • A
    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
  • ✓
    A is false but R is true.
Answer
Correct option: D.
A is false but R is true.
(D) A is false but R is true.
Speed of a vehicle in traffic jam is non-uniform because it does not move with constant speed.
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MCQ 61 Mark
Assertion (A) Motion of the moon around the earth is a circular motion.
Reason (R) When a body moves along a circular path, then it is said to be circular motion.
  • ✓
    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
When the distance of an object remains constant from a fixed point during its motion, then it is said to be circular motion, e.g. motion of moon around earth.
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Assertion (A) & Reason (B) MCQ - Science STD 7 Questions - Vidyadip