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## Chapter 1: Gravitation

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Choose the correct option.

#### Choose the correct option.

A _______ is necessary to change the speed as well as the direction of motion of an object.

force

inertia

momentum

motion

The orbit of a planet revolving around a star is _______.

circular

linear

towards the focal point

elliptical

The square of its period of revolution around the sun is directly proportional to the _______ of the mean distance of a planet from the sun.

square

square root

cube

cube root

The gravitational force between two bodies is directly proportional to the product of the masses of those bodies and is _______ of the distance between them.

inversely proportional to the square

directly proportional to the square

inversely proportional to the cube

inversely proportional to the square root

The value of universal gravitational constant (G) in the SI unit is _______.

6.673 × 10

^{-11}Nm^{2}/kg^{2}6.673 × 10

^{11}Nm/kg9.673 × 10

^{-11}Nm/kg9.673 × 10

^{-11}Nm^{2}/kg^{2}

The _______ force is much weaker than other forces in nature.

gravitational

electromagnetic

nuclear force

intermolecular

The value of gravitational acceleration (g) is ________.

highest at the poles

highest at the equator

same everywhere on the surface of the earth

lowest at the poles

The value of gravitational acceleration (g) is ________ at the equator.

9.78 m/s

^{2}9.832 m/s

^{2}9.8 m/s

^{2}6.67 m/s

^{2}

The free fall of an object is possible only in _______.

air

vacuum

on the surface of earth

None of these

The weight of any object on the moon is nearly _______ of the weight of the earth.

1/6

1/8

1/2

2/6

A person weighs 60 N on earth. His weight on the moon will be _______.

360 N

60 N

6 N

10 N

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Right or Wrong sentence

If the distance between two masses is doubled, the gravitational force between them becomes less than the previous force.

Right

Wrong

The CGS unit of G is dyne.cm^{2}/g^{2}.

Right

Wrong

The value of gravitational acceleration at the centre of earth is zero.

Right

Wrong

The value of g is highest at the equator.

Right

Wrong

The value of G varies from place to place.

Right

Wrong

As we go above the earth's surface, value of g increases.

Right

Wrong

Free fall of an object does not depend on the mass of the object.

Right

Wrong

Mass is a qualitative measure of the inertia of an object.

Right

Wrong

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Write scientific reasons

**Write scientific reason.**

The value of acceleration g is greater at the pole than at the equator.

**Write scientific reason.**

The value of gravitational acceleration (g) decreases as we go above the Earth's surface.

**Write scientific reason.**

The value of gravitational acceleration (g) decreases as we go deep inside the earth.

**Write scientific reason.**

When we drop a feather and a stone at the same time from a height the stone reach the earth faster than a feather.

**Write scientific reason.**

The weight of an object varies on different planets.

**Write scientific reason.**

The value of gravitational acceleration (g) is taken to be -g when studying the motion of an object thrown upwards in a straight line.

**Write scientific reason.**

The value of g at the centre of the earth is zero.

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Solve the following Questions

**Complete the following chart regarding the weight and mass of an object.**

Object |
On Earth |
On moon |

Mass | X | ______ |

Weight | ______ | Y |

State Newton’s Universal Law of Gravitation.

Define acceleration due to gravity.

Write acceleration due to gravity value on the surface of Earth.

If a person weighs 750 N on Earth, what will be the weight of the person on moon?

(The mass of moon is `1/81` times the mass earth and its radius is `1/3.7` times that of earth.)

Mahendra and Virat are sitting at a distance of 1 m from each other.Their masses are 75 kg and 80 kg respectively. What is the gravitational force between them? (G = 6.67 × 10^{-11} Nm^{2}/kg^{2})

**Identify the mistake in the given diagram and draw it again.**

The mass of planet ‘X” is four times that of the earth and its radius is double the radius of the earth. The escape velocity of a body from the earth is 11.2 × 10^{3} m/s. Find the escape velocity of a body from the planet ‘X’.

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Distinguish between

**Distinguish between:**

Universal gravitational constant - Gravitational acceleration of earth.

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Write short notes

**Write a short note.**

Escape Velocity

**Write a short note.**

Free Fall

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Answer the Following

**Observe the given figure and answer these following questions.**

**The orbit of a planet moving around the Sun**

- What is the conclusion about the orbit of a planet?
- What is the relation between velocity of planet and distance from sun?
- Explain the relation between areas ASB, CSD and ESF.

Write the Kepler's laws.

State Newton's universal law of gravitation. Express it with the mathematical form of force of gravitation?

An object takes 5 s to reach the ground from a height of 5 m on a planet. What is the value of g on the planet?

The radius of planet A is half the radius of planet B. If the mass of A is M_{A}, what must be the mass of B so that the value of g on B is half that of its value on A?

An object thrown vertically upwards reaches a height of 500 m. What was its initial velocity? How long will the object take to come back to the earth? Assume g = 10 m/s^{2 }

A ball falls off a table and reaches the ground in 1 s. Assuming g = 10 m/s^{2}, calculate its speed on reaching the ground and the height of the table.

The masses of the earth and moon are 6 × 10^{24} kg and 7.4 × 10^{22} kg, respectively. The distance between them is 3.8 × 10^{5} km. Calculate the gravitational force of attraction between the two? Use G = 6.7 × 10^{–11} N m^{2} kg^{–2}

The mass and weight of an object on earth are 5 kg and 49 N respectively. What will be their values on the moon? Assume that the acceleration due to gravity on the moon is 1/6th of that on the earth

The mass of the earth is 6 × 10^{24} kg. The distance between the earth and the sun is 1.5 × 10^{11} m. If the gravitational force between the two is 3.5 × 10^{22} N, what is the mass of the sun? Use G = 6.7 × 10^{–11 }N m^{2} kg^{–2}

A tennis ball is thrown up and reaches a height of 4.05 m before coming down. What was its initial velocity? How much total time will it take to come down? Assume g = 10 m/s^{2}?

### SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 Chapter 1 Gravitation Answer the following questions

**Read the given passage carefully and answer the questions.**

We know that the force of gravity due to the earth acts on each and every object. When we were holding the stone in our hand, the stone was experiencing this force, but it was balanced by a force that we were applying on it in the opposite direction. As a result, the stone remained at rest. Once we release the stone from our hands, the only force that acts on it is the gravitational force of the earth and the stone falls down under its influence. Whenever an object moves under the influence of the force of gravity alone, it is said to be falling freely. Thus the released stone is in a free fall. In free fall, the initial velocity of the object is zero and goes on increasing due to the acceleration due to the gravity of the earth. During free fall, the frictional force due to air opposes the motion of the object and a buoyant force also acts on the object. Thus, true free fall is possible only in a vacuum.

**1) Complete the following statement by choosing the right option.**

The stone held in the hand is stable because on it __.

- two unbalanced forces are exerted.
- only the gravitational force of the earth is exerted.
- gravitational force of the earth is not exerted.
- two balanced forces are exerted.

**2)** Why does free fall not happen on the earth?

**3)** Why does the velocity of the object increase during the free fall?

**4)** Which type of force exerts on the object during free fall?

**5)** Why does free fall happen only in a vacuum?

## Chapter 1: Gravitation

## SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 chapter 1 - Gravitation

SCERT Maharashtra Question Bank solutions for 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 chapter 1 (Gravitation) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in 10th Standard SSC Science and Technology 1 Maharashtra State Board 2021 chapter 1 Gravitation are Gravitation, Centripetal Acceleration and Centripetal Force, Kepler’s Laws, Newton’s Universal Law of Gravitation, Free Fall, Gravitational Potential Energy, Force, Motion and Rest, Uniform Circular Motion, Acceleration Due to Gravity (Earth’s Gravitational Acceleration), Mass and Weight of an Object.

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