Online Test — Force and Pressure
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
A force is best described as a:
Push or pull
Type of energy
Speed
Mass
Explanation: A force is a push or a pull acting on an object.
Question 2 of 25
The SI unit of force is the:
Joule
Newton
Pascal
Watt
Explanation: The SI unit of force is the newton (N).
Question 3 of 25
Which of these is a non-contact force?
Friction
Muscular force
Gravitational force
Normal force
Explanation: Gravity acts across a distance without contact, so it is a non-contact force.
Question 4 of 25
When the forces on an object cancel out, they are said to be:
Unbalanced
Balanced
Contact forces
Magnetic
Explanation: Forces that cancel out (net force zero) are balanced forces.
Question 5 of 25
Only which kind of force can change an object's state of motion?
Balanced force
Unbalanced force
Zero force
Contact force only
Explanation: An unbalanced (non-zero net) force is needed to change an object's motion.
Question 6 of 25
Pressure is defined as the force acting per unit:
Time
Area
Volume
Mass
Explanation: Pressure is the force acting per unit area, P = F/A.
Question 7 of 25
The SI unit of pressure is the:
Newton
Pascal
Joule
Watt
Explanation: The SI unit of pressure is the pascal (Pa) = N/m².
Question 8 of 25
A force of 100 N on an area of 5 m² gives a pressure of:
20 Pa
50 Pa
500 Pa
105 Pa
Explanation: P = F/A = 100 ÷ 5 = 20 Pa.
Question 9 of 25
For the same force, a smaller area produces a pressure that is:
Smaller
Greater
Zero
Unchanged
Explanation: Pressure increases as area decreases for a fixed force.
Question 10 of 25
Wide tyres are used on tractors to:
Increase pressure
Reduce pressure on soft ground
Increase weight
Reduce the force
Explanation: Wide tyres spread the load over a large area, reducing pressure so the tractor does not sink.
Question 11 of 25
A fluid exerts pressure:
Only downward
Only sideways
In all directions
Only upward
Explanation: A fluid presses in all directions, not just downward.
Question 12 of 25
As the depth in a liquid increases, the liquid pressure:
Decreases
Increases
Stays the same
Becomes zero
Explanation: Liquid pressure increases with depth as more liquid presses from above.
Question 13 of 25
The pressure at a depth in a liquid is given by:
P = F/A
P = hρg
P = ma
P = IR
Explanation: The pressure at depth h in a liquid is P = hρg.
Question 14 of 25
Pascal's law states that pressure on an enclosed fluid is transmitted:
Only downward
Equally in all directions
Only to the top
Not at all
Explanation: Pascal's law: pressure on an enclosed fluid is transmitted equally in all directions.
Question 15 of 25
Which machine works on Pascal's law?
Electric motor
Hydraulic brake
Thermometer
Pulley
Explanation: Hydraulic brakes (and lifts/jacks) work on Pascal's law.
Question 16 of 25
Atmospheric pressure is caused by the weight of the:
Water
Air (atmosphere)
Soil
Clouds only
Explanation: Atmospheric pressure is due to the weight of the air pressing down.
Question 17 of 25
At sea level, atmospheric pressure is approximately:
100 Pa
1,000 Pa
100,000 Pa
10 Pa
Explanation: Atmospheric pressure at sea level is about 100,000 Pa (10⁵ Pa).
Question 18 of 25
In the crushing can experiment, the can is crushed by:
Pressure inside the can
Atmospheric pressure outside
Heat only
Magnetism
Explanation: After steam condenses, the greater outside atmospheric pressure crushes the can.
Question 19 of 25
As altitude increases, atmospheric pressure:
Increases
Decreases
Stays the same
Doubles
Explanation: With less air above at higher altitude, atmospheric pressure decreases.
Question 20 of 25
The instrument used to measure atmospheric pressure is the:
Thermometer
Barometer
Ammeter
Spring balance
Explanation: A barometer is used to measure atmospheric pressure.
Question 21 of 25
The upward force exerted by a fluid on an object in it is called:
Friction
Upthrust (buoyant force)
Weight
Pressure
Explanation: The upward force a fluid exerts on an object is the upthrust or buoyant force.
Question 22 of 25
Archimedes' principle states that the upthrust equals the weight of the fluid:
Displaced
Heated
Frozen
Evaporated
Explanation: The upthrust equals the weight of the fluid displaced by the object.
Question 23 of 25
An object floats in a fluid if its density is ______ the fluid's density.
Greater than
Less than
Equal to only
Zero
Explanation: An object floats when its density is less than that of the fluid.
Question 24 of 25
An object weighs 60 N in air and 45 N in water. The upthrust is:
15 N
45 N
60 N
105 N
Explanation: Upthrust = real weight − apparent weight = 60 − 45 = 15 N.
Question 25 of 25
A heavy iron ship floats because it is built hollow, making its average density:
Greater than water
Less than water
Equal to iron
Zero
Explanation: A hollow ship's average density is less than water, so it floats.