Q.1 Displacement is a ______ quantity.
Scalar
Vector
Both scalar and vector
Neither scalar nor vector
Explanation - Displacement has both magnitude and direction, making it a vector quantity.
Correct answer is: Vector
Q.2 Which of the following can never be negative?
Displacement
Velocity
Distance
Acceleration
Explanation - Distance is the total path length and is always positive or zero.
Correct answer is: Distance
Q.3 A body moves 4 m north and then 3 m east. The displacement is:
7 m
5 m
1 m
12 m
Explanation - Using Pythagoras theorem: √(4²+3²) = 5 m.
Correct answer is: 5 m
Q.4 The SI unit of acceleration is:
m/s
m/s²
m²/s
s/m²
Explanation - Acceleration is the rate of change of velocity, measured in m/s².
Correct answer is: m/s²
Q.5 If a body has zero velocity, then its acceleration:
Must be zero
May be zero or non-zero
Must be negative
Must be positive
Explanation - At rest, a body can have acceleration if it is about to start moving.
Correct answer is: May be zero or non-zero
Q.6 Uniform motion means:
Constant acceleration
Constant speed
Constant velocity
Constant displacement
Explanation - Uniform motion refers to motion with constant velocity in a straight line.
Correct answer is: Constant velocity
Q.7 Area under a velocity-time graph represents:
Velocity
Acceleration
Displacement
Force
Explanation - The area under a velocity-time curve gives displacement.
Correct answer is: Displacement
Q.8 The slope of a displacement-time graph gives:
Acceleration
Force
Velocity
Distance
Explanation - Slope of displacement-time graph = change in displacement/change in time = velocity.
Correct answer is: Velocity
Q.9 A car accelerates uniformly from 5 m/s to 25 m/s in 5 seconds. The acceleration is:
4 m/s²
5 m/s²
2 m/s²
6 m/s²
Explanation - a = (v-u)/t = (25-5)/5 = 4 m/s².
Correct answer is: 4 m/s²
Q.10 If an object has zero acceleration, its velocity:
Must be zero
Must be constant
Must be increasing
Must be decreasing
Explanation - Zero acceleration means no change in velocity, hence constant velocity.
Correct answer is: Must be constant
Q.11 An object is thrown vertically upward with a velocity u. The maximum height reached is:
u²/2g
u²/g
2u²/g
u/g
Explanation - At max height, v = 0; using v² = u² - 2gh ⇒ h = u²/2g.
Correct answer is: u²/2g
Q.12 The motion of a freely falling body is an example of:
Uniform motion
Uniformly accelerated motion
Oscillatory motion
Non-uniform acceleration
Explanation - A free fall has constant acceleration g, hence uniformly accelerated motion.
Correct answer is: Uniformly accelerated motion
Q.13 Displacement-time graph of a body at rest is:
A straight line inclined to time axis
A horizontal line
A vertical line
A curved line
Explanation - At rest, displacement does not change, giving a horizontal line parallel to time axis.
Correct answer is: A horizontal line
Q.14 When a car moves with constant speed in a straight line, its acceleration is:
Positive
Negative
Zero
Increasing
Explanation - Constant speed and direction means velocity is constant, so acceleration is zero.
Correct answer is: Zero
Q.15 The distance-time graph for uniform motion is:
Parabola
Straight line
Circle
Hyperbola
Explanation - For uniform motion, distance increases linearly with time.
Correct answer is: Straight line
Q.16 Which of the following is a vector quantity?
Speed
Distance
Displacement
Time
Explanation - Displacement has direction; the others are scalars.
Correct answer is: Displacement
Q.17 If initial velocity u = 0, the equation of motion simplifies to:
s = ut + ½at²
s = ½at²
s = vt
s = at²
Explanation - With u=0, displacement equation becomes s = ½at².
Correct answer is: s = ½at²
Q.18 The dimensional formula of acceleration is:
[M⁰L¹T⁻²]
[M¹L⁰T⁻²]
[M⁰L⁻¹T²]
[M⁰L¹T¹]
Explanation - Acceleration = velocity/time = (L T⁻¹)/T = L T⁻².
Correct answer is: [M⁰L¹T⁻²]
Q.19 The average velocity is defined as:
Total displacement/total time
Total distance/total time
Instantaneous velocity
Change of acceleration/time
Explanation - Average velocity is displacement divided by time interval.
Correct answer is: Total displacement/total time
Q.20 Which of the following is true for retardation?
It is always positive
It is negative acceleration
It is zero
It is constant velocity
Explanation - Retardation is acceleration opposite to velocity, i.e., negative acceleration.
Correct answer is: It is negative acceleration
Q.21 If velocity-time graph is a straight line parallel to time axis, then acceleration is:
Zero
Constant positive
Constant negative
Variable
Explanation - Parallel to time axis means velocity is constant, hence acceleration is zero.
Correct answer is: Zero
Q.22 The motion of the hour hand of a clock is:
Rectilinear
Circular
Oscillatory
Random
Explanation - The tip of the hour hand traces a circle over time.
Correct answer is: Circular
Q.23 Acceleration due to gravity near Earth’s surface is:
9.8 m/s²
10 m/s
9.8 km/s²
1 g/s
Explanation - Standard acceleration due to gravity on Earth is approximately 9.8 m/s².
Correct answer is: 9.8 m/s²
Q.24 Which physical quantity is obtained from the slope of a velocity-time graph?
Displacement
Acceleration
Force
Work
Explanation - Slope of velocity-time graph = change in velocity/change in time = acceleration.
Correct answer is: Acceleration
Q.25 In SI units, displacement is measured in:
cm
km
m
mm
Explanation - Displacement is a length quantity, measured in meters in SI system.
Correct answer is: m