Gravitation Practice Questions
JEE · Physics · 1721 free MCQs with instant results and detailed explanations.
1721
Total
424
Easy
755
Medium
542
Hard
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Topics in Gravitation
Gravitational Potential
380
Kepler's Laws
411
Orbital Mechanics
290
Newton's Law of Gravitation
380
Escape Velocity
260
Sample Questions from Gravitation
Here are 10 sample questions. Start a quiz to get randomized questions with scoring.
Q1
Easy
What is the value of gravitational acceleration (g) at the Earth's surface?
A.
9.8 m/s²
B.
10 m/s²
C.
9.81 m/s²
D.
8.9 m/s²
Show Answer & Explanation
Correct Answer: C
Gravitational acceleration at the Earth's surface is approximately 9.81 m/s².
Q2
Easy
Which of the following statements is true regarding gravitational force?
A.
It is a vector quantity
B.
It does not depend on distance
C.
It acts only at contact
D.
It is negligible at large distances
Show Answer & Explanation
Correct Answer: A
Gravitational force is a vector quantity as it has both magnitude and direction.
Q3
Easy
The gravitational force between two masses is 20 N. What will be the force if the distance between them is tripled?
A.
20 N
B.
5 N
C.
60 N
D.
1.33 N
Show Answer & Explanation
Correct Answer: B
The gravitational force is inversely proportional to the square of the distance. If distance is tripled, force decreases to 1/9.
Q4
Medium
If the mass of an object is doubled while its distance from the center of the Earth remains the same, how does the gravitational force acting on it change?
A.
It doubles.
B.
It quadruples.
C.
It remains the same.
D.
It decreases by half.
Show Answer & Explanation
Correct Answer: A
According to Newton's Law of Gravitation, the gravitational force is directly proportional to the product of the masses and inversely proportional to the square of the distance between their centers. Doubling the mass of the object while keeping the distance constant will double the gravitational force.
Q5
Medium
What is the acceleration due to gravity at a height equal to the radius of the Earth?
A.
g/4
B.
g/2
C.
g
D.
g/8
Show Answer & Explanation
Correct Answer: A
At a height equal to the Earth's radius, the gravitational force is reduced to one-fourth due to the inverse square law.
Q6
Medium
A satellite is in a stable orbit around Earth. How does its orbital speed compare to the speed of an object falling freely towards Earth?
A.
Faster than falling object
B.
Slower than falling object
C.
Equal to falling object
D.
Depends on height
Show Answer & Explanation
Correct Answer: A
The satellite's orbit requires a higher speed due to centripetal force being provided by gravitational force.
Q7
Medium
If the mass of the Earth were to double, what would happen to the gravitational force between two objects on its surface?
A.
Force would double
B.
Force would halve
C.
Force would remain the same
D.
Force would increase by a factor of four
Show Answer & Explanation
Correct Answer: A
Gravitational force is directly proportional to the product of the masses, so doubling Earth's mass doubles the force.
Q8
Hard
Two objects, A and B, with masses 3 kg and 5 kg respectively, are separated by a distance of 2 meters. What is the gravitational force between them?
A.
3.0 x 10^-8 N
B.
4.5 x 10^-8 N
C.
6.67 x 10^-11 N
D.
1.5 x 10^-9 N
Show Answer & Explanation
Correct Answer: C
The gravitational force can be calculated using Newton's law of gravitation: F = G(m1*m2)/r^2, where G is the gravitational constant (6.67 x 10^-11 N m²/kg²). Plugging in the values gives F = 6.67 x 10^-11 * (3 * 5)/(2^2) = 6.67 x 10^-11 * 15/4 = 6.67 x 10^-11 N.
Q9
Hard
If the distance between two objects is doubled, how does the gravitational force between them change?
A.
It doubles
B.
It remains the same
C.
It decreases by a factor of four
D.
It decreases by a factor of two
Show Answer & Explanation
Correct Answer: C
According to Newton's law of gravitation, the gravitational force is inversely proportional to the square of the distance between the objects. If the distance is doubled, the force decreases by a factor of 2^2 = 4.
Q10
Hard
An artificial satellite is in a circular orbit 400 km above the Earth's surface. If the radius of the Earth is approximately 6400 km, what is the gravitational acceleration experienced by the satellite?
A.
7.8 m/s²
B.
9.8 m/s²
C.
8.9 m/s²
D.
6.0 m/s²
Show Answer & Explanation
Correct Answer: C
To calculate gravitational acceleration at the satellite's altitude, use g' = GM/(R+h)². Here, R = 6400 km, h = 400 km, and G = 9.81 m/s², resulting in g' = 9.81/(6.8)² ≈ 8.9 m/s².
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Gravitation — JEE Physics Practice Questions Online
This page contains 1721 practice MCQs for the chapter Gravitation in JEE Physics. The questions are organized by difficulty — 424 easy, 755 medium, 542 hard — so you can choose the right level for your preparation.
Every question includes a detailed explanation to help you understand the concept, not just memorize answers. Take a timed quiz to simulate exam conditions, or practice at your own pace with no time limit. This chapter covers 5 topics, giving you comprehensive coverage of the entire chapter.