CBSE Class 9 Physics Gravitation MCQs Set 17

Physics Objective Questions and Answers: Gravitation

Explore reliable objective questions for Gravitation tailored for Class 9 learners. Utilizing these Physics multiple-choice formats ensures thorough preparation and strengthens problem-solving speed for upcoming school assessments.

Download Gravitation MCQs with Answers

Navigate directly to the 50 objective questions for Gravitation using the digital viewer below. Each practice set includes verified answer keys, allowing students to instantly cross-check their work and identify areas requiring further revision.

Multiple Choice Questions

Question 1: The force of gravitation between two bodies depends upon
(a) their separation
(b) the gravitational constant
(c) the product of their masses
(d) all of these
Show Answer & Explanation

Answer: (d) all of these

Explanation:
1. F = Gm₁m₂/r².
2. It depends on G, on the product of the masses and on the separation.

Teacher's Note:
1. Read off the quantities in the formula.

Question 2: The maximum weight of a body is
(a) at the centre of the earth
(b) inside the earth
(c) on the surface of the earth
(d) above the surface of the earth
Show Answer & Explanation

Answer: (c) on the surface of the earth

Explanation:
1. The value of g is maximum on the surface of the earth.
2. It decreases both with height and with depth, being zero at the centre.

Teacher's Note:
1. Weight = mg and g is maximum at the surface.

Question 3: If the distance between two masses is doubled, the force between them will become
(a) ¼ times
(b) 4 times
(c) ½ times
(d) 2 times
Show Answer & Explanation

Answer: (a) ¼ times

Explanation:
1. F ∝ 1/r².
2. When r is doubled, F becomes 1/2² = ¼ of its value.

Teacher's Note:
1. Gravitational force follows an inverse square law.

Question 4: The SI unit of g is
(a) m²/s
(b) m/s²
(c) s/m²
(d) m/s
Show Answer & Explanation

Answer: (b) m/s²

Explanation:
1. g is an acceleration, so its SI unit is m/s².

Teacher's Note:
1. Acceleration is measured in m/s².

Question 5: The force of gravitation exists
(a) everywhere in the universe
(b) at the surface of the earth only
(c) inside the earth only
(d) at the surface of the moon only
Show Answer & Explanation

Answer: (a) everywhere in the universe

Explanation:
1. The law of gravitation is universal: every pair of masses in the universe attracts each other.

Teacher's Note:
1. Universal means everywhere.

Question 6: The acceleration due to gravity on planet A is 9 times the acceleration due to gravity on planet B. A man can jump to a height of 2 m on the surface of A. What is the height of jump by the same person on planet B?
(a) 2/9 m
(b) 18 m
(c) 6 m
(d) 2/3 m
Show Answer & Explanation

Answer: (b) 18 m

Explanation:
1. The take-off speed is the same, so the height h = u²/2g ∝ 1/g.
2. gB is 1/9 of gA, so hB = 9 × 2 = 18 m.

Teacher's Note:
1. Height is inversely proportional to g.

Question 7: If the radius of the earth were to decrease by 1%, its mass remaining the same, the acceleration due to gravity on the surface of the earth will
(a) increase by 1%
(b) increase by 2%
(c) decrease by 1%
(d) decrease by 2%
Show Answer & Explanation

Answer: (b) increase by 2%

Explanation:
1. g = GM/R², so g ∝ 1/R².
2. R decreases by 1%, so g increases by about 2%.

Teacher's Note:
1. Percentage change is doubled for a square law.

Question 8: The value of the acceleration due to gravity on the surface of the earth is g. If the radius of the earth is 6400 km, then what will be the acceleration due to gravity at a point 3200 km above the surface of the earth?
(a) g/9
(b) 2g/9
(c) 4g/9
(d) g/2
Show Answer & Explanation

Answer: (c) 4g/9

Explanation:
1. g' = g R²/(R + h)² = g (6400)²/(9600)².
2. g' = g × (2/3)² = 4g/9.

Teacher's Note:
1. Distance from the centre is R + h = 9600 km.

Question 9: The relation between g and G is
(a) \( g=\frac{GM}{R^2} \)
(b) \( \frac{GR^2}{M} \)
(c) g = GMR²
(d) \( \frac{G}{MR^2} \)
Show Answer & Explanation

Answer: (a) \( g=\frac{GM}{R^2} \)

Explanation:
1. Weight mg = GMm/R².
2. So g = GM/R².

Teacher's Note:
1. Equate weight with the gravitational force.

Question 10: The value of g at the poles is
(a) greater than the value at the equator
(b) less than the value at the equator
(c) equal to the value at the equator
(d) none of these
Show Answer & Explanation

Answer: (a) greater than the value at the equator

Explanation:
1. The earth is flattened at the poles, so the poles are closer to the centre.
2. Also the earth's rotation reduces g at the equator.
3. Hence g is greater at the poles.

Teacher's Note:
1. Radius is smaller at the poles.

Question 11: Weight
(a) is a vector quantity
(b) of a body in interplanetary space is maximum
(c) increases when the body goes up
(d) none of these
Show Answer & Explanation

Answer: (a) is a vector quantity

Explanation:
1. Weight is a force (mg) directed towards the centre of the earth, so it is a vector.
2. In interplanetary space it is nearly zero and it decreases as the body goes up.

Teacher's Note:
1. Mass is a scalar; weight is a vector.

Question 12: A satellite is moving around the earth with speed v in a circular orbit of radius r. If the orbit radius is decreased by 1%, its speed will
(a) increase by 1%
(b) increase by 0.5%
(c) decrease by 1%
(d) decrease by 0.5%
Show Answer & Explanation

Answer: (b) increase by 0.5%

Explanation:
1. v = √(GM/r), so v ∝ r^(−1/2).
2. r decreases by 1%, so v increases by about ½ × 1% = 0.5%.

Teacher's Note:
1. Use the binomial approximation.

Question 13: The radius of the earth is 6000 km. The weight of a body on the surface of the earth is 120 kg wt. If it is taken to a height of 2000 km above the surface of the earth, its weight is
(a) 60 kg wt
(b) 40 kg wt
(c) 67.5 kg wt
(d) 47.5 kg wt
Show Answer & Explanation

Answer: (c) 67.5 kg wt

Explanation:
1. Weight ∝ 1/(R + h)², so W' = 120 × (6000/8000)².
2. W' = 120 × 9/16 = 67.5 kg wt.

Teacher's Note:
1. Use the ratio R/(R + h) = 3/4.

Question 14: A body falls freely towards the earth with
(a) uniform speed
(b) uniform velocity
(c) uniform acceleration
(d) none of these
Show Answer & Explanation

Answer: (c) uniform acceleration

Explanation:
1. A freely falling body has a constant acceleration g (near the surface).
2. Its speed increases uniformly, so speed and velocity are not uniform.

Teacher's Note:
1. Free fall is uniformly accelerated motion.

Free study material for Science

Download Chapter MCQs: Class 9 Physics Gravitation

Class 9 Physics Gravitation Objective Test Questions

Explore reliable practice questions for Gravitation tailored for Class 9 Physics learners. Use these multiple-choice formats to evaluate preparedness and strengthen problem-solving skills.

NCERT-Aligned Objective Questions and Solutions

Each question includes structured solution keys mapped directly to standard CBSE textbooks, helping students evaluate their reasoning and correct mistakes early in their revision.

Next Steps in Your Exam Preparation

Explore our broader library of printable assignments, chapter notes, and mock tests designed to support continuous revision and secure higher marks in CBSE assessments.

FAQs

Where can I access latest CBSE Class 9 Physics Gravitation MCQs Set 17?

You can get most exhaustive CBSE Class 9 Physics Gravitation MCQs Set 17 for free on StudiesToday.com. These MCQs for Class 9 Physics are updated for the 2026-27 academic session as per CBSE examination standards.

Are Assertion-Reasoning and Case-Study MCQs included in the Physics Class 9 material?

Yes, our CBSE Class 9 Physics Gravitation MCQs Set 17 include the latest type of questions, such as Assertion-Reasoning and Case-based MCQs. 50% of the CBSE paper is now competency-based.

How do practicing Physics MCQs help in scoring full marks in Class 9 exams?

By solving our CBSE Class 9 Physics Gravitation MCQs Set 17, Class 9 students can improve their accuracy and speed which is important as objective questions provide a chance to secure 100% marks in the Physics.

Do you provide answers and explanations for CBSE Class 9 Physics Gravitation MCQs Set 17?

Yes, Physics MCQs for Class 9 have answer key and brief explanations to help students understand logic behind the correct option as its important for 2026 competency-focused CBSE exams.

Can I practice these Physics Class 9 MCQs online?

Yes, you can also access online interactive tests for CBSE Class 9 Physics Gravitation MCQs Set 17 on StudiesToday.com as they provide instant answers and score to help you track your progress in Physics.