Vidaara.orgClass 8 · Mathematics
CodeVID-M8-WS
Gravitation — 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.
The gravitational force between two objects is always one of:
- A.Repulsion
- B.Attraction
- C.No force
- D.Friction
2.
The gravitational force is directly proportional to the ______ of the masses.
- A.Sum
- B.Product
- C.Difference
- D.Ratio
3.
The gravitational force is inversely proportional to the ______ of the distance.
- A.Square
- B.Cube
- C.Square root
- D.Double
4.
In F = G m₁ m₂ / r², the symbol G is the:
- A.Mass
- B.Distance
- C.Universal gravitational constant
- D.Force
5.
If the distance between two objects is doubled, the gravitational force becomes:
- A.Double
- B.Half
- C.One-fourth
- D.Four times
6.
The acceleration due to gravity near the Earth's surface is about:
- A.1.8 m/s²
- B.9.8 m/s²
- C.98 m/s²
- D.0.98 m/s²
7.
The value of g depends on the mass of the falling object:
- A.True, strongly
- B.It does not depend on mass
- C.Only for heavy objects
- D.Only for light objects
8.
Ignoring air resistance, a heavy stone and a light feather dropped together will:
- A.Land together
- B.Stone lands first
- C.Feather lands first
- D.Neither falls
9.
The value of g is slightly greater at the:
- A.Equator
- B.Poles
- C.Mountain tops
- D.Sea only
10.
As altitude increases far above the surface, the value of g:
- A.Increases
- B.Decreases
- C.Stays exactly the same
- D.Becomes zero instantly
11.
The amount of matter contained in an object is its:
- A.Weight
- B.Mass
- C.Force
- D.Volume
12.
The SI unit of weight is the:
- A.Kilogram
- B.Newton
- C.Pascal
- D.Joule
13.
Weight is related to mass by the formula:
- A.W = m/g
- B.W = mg
- C.W = g/m
- D.W = m + g
14.
When an object is taken from Earth to the Moon, its mass:
- A.Becomes one-sixth
- B.Stays the same
- C.Doubles
- D.Becomes zero
15.
An object weighing 60 N on Earth would weigh about ______ on the Moon.
- A.60 N
- B.360 N
- C.10 N
- D.6 N
16.
The motion of an object falling under gravity alone is called:
- A.Projectile motion
- B.Free fall
- C.Circular motion
- D.Uniform motion
17.
During free fall, an object moves with an acceleration equal to:
- A.Zero
- B.g (≈ 9.8 m/s²)
- C.Its mass
- D.Its weight
18.
For an object dropped from rest, the velocity after time t is given by:
- A.v = gt
- B.v = ½gt
- C.v = g/t
- D.v = t/g
19.
An object dropped from rest falls for 2 s. Its velocity is (g = 10 m/s²):
- A.5 m/s
- B.10 m/s
- C.20 m/s
- D.40 m/s
20.
The height fallen in free fall (from rest) is given by:
- A.h = gt
- B.h = ½gt²
- C.h = g/t
- D.h = t²/g
21.
The force acting on a surface perpendicular to it is called:
- A.Pressure
- B.Thrust
- C.Friction
- D.Inertia
22.
Pressure is equal to:
- A.Thrust × area
- B.Thrust ÷ area
- C.Area ÷ thrust
- D.Thrust + area
23.
Hydraulic systems work on the principle of:
- A.Newton's first law
- B.Pascal's law
- C.Ohm's law
- D.Archimedes' principle
24.
A thrust of 600 N on an area of 3 m² gives a pressure of:
- A.200 Pa
- B.1800 Pa
- C.2 Pa
- D.603 Pa
25.
In a hydraulic lift, a small force on the small piston produces a ______ force on the large piston.
- A.Smaller
- B.Larger
- C.Equal
- D.Zero
Answer Key
Section A — Multiple Choice (1 mark each)
- (B) Attraction
- (B) Product
- (A) Square
- (C) Universal gravitational constant
- (C) One-fourth
- (B) 9.8 m/s²
- (B) It does not depend on mass
- (A) Land together
- (B) Poles
- (B) Decreases
- (B) Mass
- (B) Newton
- (B) W = mg
- (B) Stays the same
- (C) 10 N
- (B) Free fall
- (B) g (≈ 9.8 m/s²)
- (A) v = gt
- (C) 20 m/s
- (B) h = ½gt²
- (B) Thrust
- (B) Thrust ÷ area
- (B) Pascal's law
- (A) 200 Pa
- (B) Larger
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