Vidaara.orgClass 8 · Mathematics
CodeVID-M8-WS
Force and Pressure — Practice Worksheet
Name: ____________________
Roll No.: __________
Date: ____________
General Instructions
- All questions are compulsory.
- Choose the correct option (A, B, C or D) for each question.
- The answer key is at the end — try the paper first!
Section A — Multiple Choice (1 mark each)
25 × 1 = 25 marks
1.
A force is best described as a:
- A.Push or pull
- B.Type of energy
- C.Speed
- D.Mass
2.
The SI unit of force is the:
- A.Joule
- B.Newton
- C.Pascal
- D.Watt
3.
Which of these is a non-contact force?
- A.Friction
- B.Muscular force
- C.Gravitational force
- D.Normal force
4.
When the forces on an object cancel out, they are said to be:
- A.Unbalanced
- B.Balanced
- C.Contact forces
- D.Magnetic
5.
Only which kind of force can change an object's state of motion?
- A.Balanced force
- B.Unbalanced force
- C.Zero force
- D.Contact force only
6.
Pressure is defined as the force acting per unit:
- A.Time
- B.Area
- C.Volume
- D.Mass
7.
The SI unit of pressure is the:
- A.Newton
- B.Pascal
- C.Joule
- D.Watt
8.
A force of 100 N on an area of 5 m² gives a pressure of:
- A.20 Pa
- B.50 Pa
- C.500 Pa
- D.105 Pa
9.
For the same force, a smaller area produces a pressure that is:
- A.Smaller
- B.Greater
- C.Zero
- D.Unchanged
10.
Wide tyres are used on tractors to:
- A.Increase pressure
- B.Reduce pressure on soft ground
- C.Increase weight
- D.Reduce the force
11.
A fluid exerts pressure:
- A.Only downward
- B.Only sideways
- C.In all directions
- D.Only upward
12.
As the depth in a liquid increases, the liquid pressure:
- A.Decreases
- B.Increases
- C.Stays the same
- D.Becomes zero
13.
The pressure at a depth in a liquid is given by:
- A.P = F/A
- B.P = hρg
- C.P = ma
- D.P = IR
14.
Pascal's law states that pressure on an enclosed fluid is transmitted:
- A.Only downward
- B.Equally in all directions
- C.Only to the top
- D.Not at all
15.
Which machine works on Pascal's law?
- A.Electric motor
- B.Hydraulic brake
- C.Thermometer
- D.Pulley
16.
Atmospheric pressure is caused by the weight of the:
- A.Water
- B.Air (atmosphere)
- C.Soil
- D.Clouds only
17.
At sea level, atmospheric pressure is approximately:
- A.100 Pa
- B.1,000 Pa
- C.100,000 Pa
- D.10 Pa
18.
In the crushing can experiment, the can is crushed by:
- A.Pressure inside the can
- B.Atmospheric pressure outside
- C.Heat only
- D.Magnetism
19.
As altitude increases, atmospheric pressure:
- A.Increases
- B.Decreases
- C.Stays the same
- D.Doubles
20.
The instrument used to measure atmospheric pressure is the:
- A.Thermometer
- B.Barometer
- C.Ammeter
- D.Spring balance
21.
The upward force exerted by a fluid on an object in it is called:
- A.Friction
- B.Upthrust (buoyant force)
- C.Weight
- D.Pressure
22.
Archimedes' principle states that the upthrust equals the weight of the fluid:
- A.Displaced
- B.Heated
- C.Frozen
- D.Evaporated
23.
An object floats in a fluid if its density is ______ the fluid's density.
- A.Greater than
- B.Less than
- C.Equal to only
- D.Zero
24.
An object weighs 60 N in air and 45 N in water. The upthrust is:
- A.15 N
- B.45 N
- C.60 N
- D.105 N
25.
A heavy iron ship floats because it is built hollow, making its average density:
- A.Greater than water
- B.Less than water
- C.Equal to iron
- D.Zero
Answer Key
Section A — Multiple Choice (1 mark each)
- (A) Push or pull
- (B) Newton
- (C) Gravitational force
- (B) Balanced
- (B) Unbalanced force
- (B) Area
- (B) Pascal
- (A) 20 Pa
- (B) Greater
- (B) Reduce pressure on soft ground
- (C) In all directions
- (B) Increases
- (B) P = hρg
- (B) Equally in all directions
- (B) Hydraulic brake
- (B) Air (atmosphere)
- (C) 100,000 Pa
- (B) Atmospheric pressure outside
- (B) Decreases
- (B) Barometer
- (B) Upthrust (buoyant force)
- (A) Displaced
- (B) Less than
- (A) 15 N
- (B) Less than water
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