Online Test — Motion and Force
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
A quantity that has both magnitude and direction is called a:
Scalar
Vector
Unit
Constant
Explanation: A vector has both magnitude and direction; a scalar has only magnitude.
Question 2 of 25
The shortest straight-line distance from start to finish, in a given direction, is the:
Distance
Displacement
Speed
Path
Explanation: Displacement is the straight-line change in position with direction.
Question 3 of 25
The SI unit of speed is the:
Kilometre
Metre per second
Second
Newton
Explanation: Speed is distance ÷ time, so its SI unit is the metre per second (m/s).
Question 4 of 25
A car travels 100 m in 5 s. Its speed is:
20 m/s
5 m/s
500 m/s
0.05 m/s
Explanation: Speed = distance ÷ time = 100 ÷ 5 = 20 m/s.
Question 5 of 25
A car moving around a circular track at steady speed has a velocity that is:
Constant
Continuously changing
Always zero
Equal to its speed
Explanation: Its direction keeps changing, so the velocity (a vector) continuously changes.
Question 6 of 25
Motion in which equal distances are covered in equal intervals of time is called:
Non-uniform motion
Uniform motion
Circular motion
Random motion
Explanation: Uniform motion covers equal distances in equal time intervals at constant speed.
Question 7 of 25
The rate of change of velocity of an object with time is called:
Speed
Distance
Acceleration
Displacement
Explanation: Acceleration is the rate at which velocity changes with time.
Question 8 of 25
A horizontal straight line on a distance-time graph shows that the object is:
Speeding up
At rest
Slowing down
Accelerating
Explanation: A horizontal distance-time line means the distance is unchanged, so the object is at rest.
Question 9 of 25
For uniform motion, the distance-time graph is a:
Curved line
Straight slanting line
Horizontal line
Zig-zag line
Explanation: Equal distances in equal times give a straight slanting distance-time line.
Question 10 of 25
When an object slows down with time, the change in its motion is called:
Acceleration
Uniform motion
Deceleration
Speed
Explanation: A decrease in speed with time is called deceleration (retardation).
Question 11 of 25
The SI unit of force is the:
Joule
Newton
Metre
Watt
Explanation: Force is measured in newtons (N) in the SI system.
Question 12 of 25
The tendency of an object to resist a change in its state of rest or motion is called:
Force
Inertia
Acceleration
Friction
Explanation: This natural resistance to a change in motion is called inertia (Newton's first law).
Question 13 of 25
Newton's second law of motion is expressed by the equation:
F = m/a
F = ma
F = a/m
F = m + a
Explanation: The second law gives Force = mass × acceleration, i.e. F = ma.
Question 14 of 25
For every action there is an equal and opposite reaction. This is Newton's:
First law
Second law
Third law
Law of inertia
Explanation: Equal and opposite action-reaction pairs are described by Newton's third law.
Question 15 of 25
A force of 12 N acts on a 3 kg object. Its acceleration is:
4 m/s²
36 m/s²
9 m/s²
0.25 m/s²
Explanation: Using a = F ÷ m = 12 ÷ 3 = 4 m/s².
Question 16 of 25
Friction always acts in a direction that is:
Same as the motion
Opposite to the motion
At right angles to motion
Upward
Explanation: Friction opposes motion, so it acts opposite to the direction of (attempted) motion.
Question 17 of 25
Friction is mainly caused by the:
Colour of surfaces
Roughness of surfaces
Weight of air
Temperature only
Explanation: The roughness and interlocking irregularities of surfaces cause friction.
Question 18 of 25
Which type of friction is the smallest for the same pair of surfaces?
Static friction
Sliding friction
Rolling friction
Fluid friction
Explanation: Rolling friction is much smaller than sliding or static friction.
Question 19 of 25
Ball-bearings are used in machines because they convert sliding friction into:
Static friction
Greater friction
Rolling friction
No friction
Explanation: Ball-bearings change sliding friction into much smaller rolling friction.
Question 20 of 25
Applying oil to machine parts is an example of:
Increasing friction
Reducing friction
Adding inertia
Increasing mass
Explanation: Oil is a lubricant that reduces friction between moving parts.
Question 21 of 25
Pressure is defined as the force acting per unit:
Time
Area
Mass
Volume
Explanation: Pressure = force ÷ area, so it is the force acting per unit area.
Question 22 of 25
The SI unit of pressure is the:
Newton
Pascal
Joule
Watt
Explanation: Pressure is measured in pascals (Pa), where 1 Pa = 1 N/m².
Question 23 of 25
For the same force, the pressure is greater when the area of contact is:
Larger
Smaller
Zero
Unchanged
Explanation: Since P = F ÷ A, a smaller area gives a larger pressure for the same force.
Question 24 of 25
The upward force exerted by a liquid on an object immersed in it is called:
Friction
Upthrust (buoyant force)
Pressure
Weight
Explanation: The upward force on an immersed object is the upthrust or buoyant force.
Question 25 of 25
According to Archimedes' Principle, the upthrust on an immersed object equals the:
Weight of the object
Weight of liquid displaced
Volume of the object
Density of the liquid
Explanation: The upthrust equals the weight of the liquid displaced by the immersed object.