Online Test — Gravitation
25 Questions • 15 min • Chapter MCQ
15:00
Question 1 of 25
The gravitational force between two objects is always one of:
Repulsion
Attraction
No force
Friction
Explanation: Gravitation is always a force of attraction between objects.
Question 2 of 25
The gravitational force is directly proportional to the ______ of the masses.
Sum
Product
Difference
Ratio
Explanation: The force is directly proportional to the product of the two masses.
Question 3 of 25
The gravitational force is inversely proportional to the ______ of the distance.
Square
Cube
Square root
Double
Explanation: The force is inversely proportional to the square of the distance (1/r²).
Question 4 of 25
In F = G m₁ m₂ / r², the symbol G is the:
Mass
Distance
Universal gravitational constant
Force
Explanation: G is the universal gravitational constant, the same everywhere.
Question 5 of 25
If the distance between two objects is doubled, the gravitational force becomes:
Double
Half
One-fourth
Four times
Explanation: Since F ∝ 1/r², doubling the distance makes the force one-fourth.
Question 6 of 25
The acceleration due to gravity near the Earth's surface is about:
1.8 m/s²
9.8 m/s²
98 m/s²
0.98 m/s²
Explanation: The acceleration due to gravity near the surface is about 9.8 m/s².
Question 7 of 25
The value of g depends on the mass of the falling object:
True, strongly
It does not depend on mass
Only for heavy objects
Only for light objects
Explanation: g is the same for all objects and does not depend on their mass.
Question 8 of 25
Ignoring air resistance, a heavy stone and a light feather dropped together will:
Land together
Stone lands first
Feather lands first
Neither falls
Explanation: Without air resistance, all objects fall with the same g, so they land together.
Question 9 of 25
The value of g is slightly greater at the:
Equator
Poles
Mountain tops
Sea only
Explanation: The poles are closer to the Earth's centre, so g is greater there.
Question 10 of 25
As altitude increases far above the surface, the value of g:
Increases
Decreases
Stays exactly the same
Becomes zero instantly
Explanation: Farther from the Earth's centre, g decreases slightly.
Question 11 of 25
The amount of matter contained in an object is its:
Weight
Mass
Force
Volume
Explanation: Mass is the amount of matter in an object, measured in kilograms.
Question 12 of 25
The SI unit of weight is the:
Kilogram
Newton
Pascal
Joule
Explanation: Weight is a force, so its SI unit is the newton (N).
Question 13 of 25
Weight is related to mass by the formula:
W = m/g
W = mg
W = g/m
W = m + g
Explanation: Weight = mass × acceleration due to gravity (W = mg).
Question 14 of 25
When an object is taken from Earth to the Moon, its mass:
Becomes one-sixth
Stays the same
Doubles
Becomes zero
Explanation: Mass is the amount of matter and does not change with location.
Question 15 of 25
An object weighing 60 N on Earth would weigh about ______ on the Moon.
60 N
360 N
10 N
6 N
Explanation: The Moon's gravity is about 1/6 of Earth's, so weight ≈ 60 ÷ 6 = 10 N.
Question 16 of 25
The motion of an object falling under gravity alone is called:
Projectile motion
Free fall
Circular motion
Uniform motion
Explanation: Free fall is motion under the influence of gravity alone.
Question 17 of 25
During free fall, an object moves with an acceleration equal to:
Zero
g (≈ 9.8 m/s²)
Its mass
Its weight
Explanation: A freely falling object accelerates at g (about 9.8 m/s²).
Question 18 of 25
For an object dropped from rest, the velocity after time t is given by:
v = gt
v = ½gt
v = g/t
v = t/g
Explanation: With u = 0, v = u + gt becomes v = gt.
Question 19 of 25
An object dropped from rest falls for 2 s. Its velocity is (g = 10 m/s²):
5 m/s
10 m/s
20 m/s
40 m/s
Explanation: v = gt = 10 × 2 = 20 m/s.
Question 20 of 25
The height fallen in free fall (from rest) is given by:
h = gt
h = ½gt²
h = g/t
h = t²/g
Explanation: With u = 0, h = ut + ½gt² becomes h = ½gt².
Question 21 of 25
The force acting on a surface perpendicular to it is called:
Pressure
Thrust
Friction
Inertia
Explanation: Thrust is the force acting on a surface in a direction perpendicular to it.
Question 22 of 25
Pressure is equal to:
Thrust × area
Thrust ÷ area
Area ÷ thrust
Thrust + area
Explanation: Pressure is thrust per unit area, P = thrust ÷ area.
Question 23 of 25
Hydraulic systems work on the principle of:
Newton's first law
Pascal's law
Ohm's law
Archimedes' principle
Explanation: Hydraulic systems use Pascal's law of pressure in enclosed fluids.
Question 24 of 25
A thrust of 600 N on an area of 3 m² gives a pressure of:
200 Pa
1800 Pa
2 Pa
603 Pa
Explanation: P = thrust ÷ area = 600 ÷ 3 = 200 Pa.
Question 25 of 25
In a hydraulic lift, a small force on the small piston produces a ______ force on the large piston.
Smaller
Larger
Equal
Zero
Explanation: The transmitted pressure acting over the larger area gives a larger force.