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1. The total length of the actual path travelled by an object, regardless of direction, is called:
A. Distance
B. Displacement
C. Speed
D. Velocity
Answer: A. Distance
Explanation: Distance is a scalar quantity representing the total path length covered by an object during its motion.
2. The shortest straight-line distance between the initial and final position of an object, along with direction, is called:
A. Displacement
B. Distance
C. Acceleration
D. Speed
Answer: A. Displacement
Explanation: Displacement is a vector quantity representing the change in position, considering both magnitude and direction.
3. The rate of change of distance with respect to time is called:
A. Speed
B. Velocity
C. Acceleration
D. Displacement
Answer: A. Speed
Explanation: Speed is a scalar quantity defined as the distance covered per unit time.
4. The rate of change of displacement with respect to time is called:
A. Velocity
B. Speed
C. Acceleration
D. Distance
Answer: A. Velocity
Explanation: Velocity is a vector quantity representing the rate of change of displacement, including both magnitude and direction.
5. The rate of change of velocity with respect to time is called:
A. Acceleration
B. Velocity
C. Speed
D. Displacement
Answer: A. Acceleration
Explanation: Acceleration measures how quickly the velocity of an object changes over time.
6. The SI unit of acceleration is:
A. m/s²
B. m/s
C. m
D. s
Answer: A. m/s²
Explanation: Since acceleration is the change in velocity (m/s) per unit time (s), its SI unit is m/s².
7. The first equation of motion is given by:
A. v = u + at
B. s = ut + 1/2at²
C. v² = u² + 2as
D. s = vt
Answer: A. v = u + at
Explanation: The first equation of motion relates final velocity (v), initial velocity (u), acceleration (a) and time (t) as v = u + at.
8. The second equation of motion is given by:
A. s = ut + 1/2at²
B. v = u + at
C. v² = u² + 2as
D. s = vt
Answer: A. s = ut + 1/2at²
Explanation: The second equation of motion calculates displacement (s) in terms of initial velocity, time and acceleration.
9. The third equation of motion is given by:
A. v² = u² + 2as
B. v = u + at
C. s = ut + 1/2at²
D. a = v/t
Answer: A. v² = u² + 2as
Explanation: The third equation of motion relates velocities and displacement without directly involving time.
10. A graph plotting the position of an object against time is called a:
A. Position-time graph
B. Velocity-time graph
C. Acceleration-time graph
D. Force-time graph
Answer: A. Position-time graph
Explanation: A position-time graph visually represents how an object's position changes over the course of time.
11. The slope of a position-time graph at any point gives the object's:
A. Instantaneous velocity
B. Instantaneous acceleration
C. Total distance
D. Average speed only
Answer: A. Instantaneous velocity
Explanation: The slope of the position-time graph at a given instant represents the object's instantaneous velocity at that moment.
12. The slope of a velocity-time graph at any point gives the object's:
A. Instantaneous acceleration
B. Instantaneous velocity
C. Total displacement
D. Position
Answer: A. Instantaneous acceleration
Explanation: The slope of the velocity-time graph represents the rate of change of velocity, i.e., the instantaneous acceleration.
13. The area under a velocity-time graph represents the object's:
A. Displacement
B. Acceleration
C. Speed
D. Force
Answer: A. Displacement
Explanation: The area enclosed under a velocity-time graph, between the curve and the time axis, gives the total displacement of the object.
14. If an object moves with uniform velocity, its acceleration is:
A. Zero
B. Constant but non-zero
C. Increasing
D. Undefined
Answer: A. Zero
Explanation: Since velocity remains constant during uniform motion, there is no change in velocity, resulting in zero acceleration.
15. If an object is in free fall under gravity (ignoring air resistance), its acceleration is:
A. Constant, equal to 'g'
B. Zero
C. Continuously increasing
D. Continuously decreasing
Answer: A. Constant, equal to 'g'
Explanation: Under free fall, an object experiences a constant acceleration due to gravity, denoted as 'g' (approximately 9.8 m/s²).
16. A body's motion is called uniformly accelerated if its velocity changes by:
A. Equal amounts in equal intervals of time
B. Random amounts each second
C. Zero amount over time
D. Only in the horizontal direction
Answer: A. Equal amounts in equal intervals of time
Explanation: Uniform acceleration means the velocity increases (or decreases) by the same amount during each successive equal time interval.
17. Displacement is classified as which type of physical quantity?
A. Vector quantity
B. Scalar quantity
C. Dimensionless quantity
D. Fundamental quantity only
Answer: A. Vector quantity
Explanation: Displacement has both magnitude and a specific direction, classifying it as a vector quantity.
18. Distance is classified as which type of physical quantity?
A. Scalar quantity
B. Vector quantity
C. Dimensionless quantity
D. Complex quantity
Answer: A. Scalar quantity
Explanation: Distance only has magnitude and no associated direction, making it a scalar quantity.
19. The average velocity of an object is calculated as:
A. Total displacement divided by total time taken
B. Total distance divided by total time taken
C. Final velocity minus initial velocity
D. Acceleration multiplied by time
Answer: A. Total displacement divided by total time taken
Explanation: Average velocity specifically uses total displacement (not distance) divided by the total time interval.
20. The average speed of an object is calculated as:
A. Total distance divided by total time taken
B. Total displacement divided by total time taken
C. Change in velocity divided by time
D. Initial velocity plus final velocity
Answer: A. Total distance divided by total time taken
Explanation: Average speed uses total path length (distance) covered, divided by the total time taken.
21. If a body moves with a negative acceleration, it is also referred to as:
A. Retardation or deceleration
B. Uniform velocity
C. Zero velocity
D. Positive acceleration
Answer: A. Retardation or deceleration
Explanation: Negative acceleration, which reduces an object's speed over time, is commonly termed retardation or deceleration.
22. For an object moving with constant velocity, the position-time graph is a:
A. Straight line with constant slope
B. Parabola
C. Horizontal straight line at zero
D. Curved exponential line
Answer: A. Straight line with constant slope
Explanation: Since velocity is constant, the rate of change of position remains constant, resulting in a straight-line position-time graph.
23. For an object undergoing uniform acceleration starting from rest, the velocity-time graph is a:
A. Straight line passing through the origin
B. Horizontal line
C. Curved parabola
D. Vertical line
Answer: A. Straight line passing through the origin
Explanation: Since velocity increases linearly with time under uniform acceleration starting from rest, the graph is a straight line through the origin.
24. If a car travels 100 m in 5 s at constant velocity, its velocity is:
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