The area under a velocity-time graph represents: MCQ with Answer and Explanation

The area under a velocity-time graph represents:
A. Acceleration
B. Distance travelled
C. Both displacement and distance travelled
D. Displacement
Answer: Option C
Solution (By JKExamLibrary)
The area under velocity-time graph gives displacement when direction is considered (signed area), and distance travelled when absolute values are taken (unsigned area). For unidirectional motion, both are equal. Velocity is rate of change of displacement, so integrating velocity over time yields displacement. This graphical interpretation is fundamental in kinematics. Memory tip: Slope of v-t graph = acceleration; area under v-t graph = displacement. Competitive exams often combine graph analysis with conceptual understanding to test depth of knowledge in motion topics.

Discuss this Question (0)

No comments yet. Be the first to start the discussion!

Practice More Physics Questions

Question #1
A moving coil galvanometer can be converted into a voltmeter by connecting
A. High resistance in parallel
B. Low resistance in series
C. High resistance in series
D. Low resistance in parallel

Correct Answer: Option C


Explanation:
High resistance in series limits current and extends voltage range.

This question belongs to: Science Physics
Question #2
If the error in measurement of radius of a sphere is 2%, the percentage error in the calculated volume of the sphere will be:
A. 6%
B. 2%
C. 4%
D. 8%

Correct Answer: Option A


Explanation:
Volume of sphere V = (4/3)πr³. For error propagation, percentage error in V = 3 × (percentage error in r). Given error in r is 2%, so error in V = 3 × 2% = 6%. This follows the power rule: if Q = xⁿ, then % error in Q = |n| × % error in x. This principle is crucial for experimental error analysis. Exam tip: Remember that volume depends on cube of radius, so errors amplify threefold. This type of question tests understanding of error propagation in derived quantities.

This question belongs to: Science Physics
Question #3
A transformer has 100 turns in primary and 200 turns in secondary. If primary voltage is 120 V, the secondary voltage is:
A. 480 V
B. 240 V
C. 120 V
D. 60 V

Correct Answer: Option B


Explanation:
Transformer voltage ratio: V_s/V_p = N_s/N_p, where N is number of turns. Thus V_s = V_p × (N_s/N_p) = 120 V × (200/100) = 240 V. This assumes ideal transformer (no losses). Step-up transformer (N_s > N_p) increases voltage. Memory aid: 'Turns ratio = voltage ratio'. This direct formula application is frequent in competitive exams. Always verify if transformer is step-up or step-down from turn counts. Note: Current ratio is inverse: I_s/I_p = N_p/N_s for power conservation (V_pI_p = V_sI_s).

This question belongs to: Science Physics