physics : class11 Gravitational Force and Weight : Gravitational Force : Gravitation MCQ Questions and Answers
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Gravitational Force and Weight
MCQ questions and answers.
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MCQ Questions
1. The weight of an object on Earth is the force with which Earth attracts the object. Which expression represents its weight?
A.
W = mg
B.
W = m/g
C.
W = g/m
D.
W = m + g
Correct Answer:
W = mg
Explanation:
Weight is the gravitational force acting on an object. It is calculated using W = mg, where m is mass and g is acceleration due to gravity.
2. What is the SI unit of weight?
A.
Kilogram
B.
Newton
C.
Metre
D.
Joule
Correct Answer:
Newton
Explanation:
Weight is a force, and the SI unit of force is the newton (N).
3. An object has a mass of 5 kg. If g = 10 m/s², what is its weight?
A.
0.5 N
B.
5 N
C.
50 N
D.
500 N
Correct Answer:
50 N
Explanation:
Using W = mg, the weight is W = 5 × 10 = 50 N.
4. Which quantity remains constant when an object is taken from Earth to the Moon?
A.
Weight
B.
Mass
C.
Gravitational force
D.
Acceleration due to gravity
Correct Answer:
Mass
Explanation:
Mass is the amount of matter in an object and does not change with location. Weight changes because the value of gravitational acceleration is different on the Moon.
5. The weight of an object on the Moon is less than its weight on Earth because:
A.
The object's mass becomes zero
B.
The Moon has a smaller value of gravitational acceleration
C.
The object loses all its matter
D.
The Moon has no gravitational force
Correct Answer:
The Moon has a smaller value of gravitational acceleration
Explanation:
Since W = mg and the Moon has a smaller value of g than Earth, the object's weight is smaller on the Moon.
6. If the mass of an object is doubled while the value of g remains unchanged, its weight will:
A.
Become half
B.
Remain unchanged
C.
Become double
D.
Become zero
Correct Answer:
Become double
Explanation:
Weight is directly proportional to mass because W = mg. Therefore, doubling the mass doubles the weight when g is constant.
7. What is the approximate weight of a 10 kg object on Earth if g = 9.8 m/s²?
A.
9.8 N
B.
19.6 N
C.
98 N
D.
980 N
Correct Answer:
98 N
Explanation:
Using W = mg, the weight is W = 10 × 9.8 = 98 N.
8. Which statement correctly distinguishes mass from weight?
A.
Mass is a force, while weight is measured in kilograms
B.
Mass is constant for an object, while weight depends on gravitational acceleration
C.
Mass and weight are always numerically equal
D.
Weight is constant everywhere, while mass changes with location
Correct Answer:
Mass is constant for an object, while weight depends on gravitational acceleration
Explanation:
Mass generally remains constant for an object, whereas weight is the gravitational force W = mg and changes when g changes.
9. If the gravitational acceleration at a place is zero, the weight of an object at that place is:
A.
Equal to its mass
B.
Zero
C.
Infinite
D.
Always 9.8 N
Correct Answer:
Zero
Explanation:
From W = mg, if g = 0, then the weight W of the object is zero, although its mass remains unchanged.
10. The gravitational force acting on an object near Earth's surface is commonly called its:
A.
Mass
B.
Density
C.
Weight
D.
Volume
Correct Answer:
Weight
Explanation:
Weight is the gravitational force exerted by Earth on an object near its surface.
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