CURIOUSITY QUIZ: GRAVITATION

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Test Your knowledge on 'Gravitation' prepared exclusively according to the NCERT science curriculum for Class-9 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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Newton discovered his famous law of universal gravitation from the apple fall incident when he was :

1 point

Sent to study at Cambridge University in 1661.

Sent to home because Plague broke out in Cambridge in 1665.

Sent to study at Oxford University in 1661.

Sent to home because Plague broke out in Oxford in 1665.

Clear selection

When the distance between two masses increases 3 times, the Force of gravity:

1 point

Increases 3 times.

Increases 9 times.

Deceases 3 times.

Deceases 9 times.

Clear selection

Who is said to have weighed the Earth by determining the value of the Universal Gravitational Constant (G) for the first time in a precision experiment ?

1 point

Johannes Kepler

Sir Isaac Newton

Henry Cavendish

Edmond Halley

Clear selection

Who gave the three laws of Planetary motion?

1 point

Sir Isaac Newton

Henry Cavendish

Johannes Kepler

Edmond Halley

Clear selection

According to the second law of planetary motion, the line joining the planet to the Sun sweeps equal areas in equal intervals of time. This implies:

1 point

The planet move around the Sun with constant velocity all the time.

The planet moves faster when it is closer to the Sun and slower when it is away from the Sun.

The planet moves slower when it is closer to the Sun and faster when it is away from the Sun

None of the above.

Clear selection

Kepler improved the model of the solar system over Copernicus by proposing that :

1 point

Planets move around the Sun in circular paths with the Sun situated at the centre.

Planets move around the Sun in elliptical paths .

Planets move around the Sun in elliptical paths with the Sun situated at its centre.

Planets move around the Sun in elliptical paths with the Sun situated at one of its foci.

Clear selection

The Universal law of Gravitation successfully explained the following phenomena :

1 point

The force that binds us to the Earth.

The motion of the Moon around the Earth .

Thee motion of the planets around the Sun.

All of the Above

Clear selection

Which of the following statements regarding the value of the acceleration due to gravity (g) is true for the Earth ?

1 point

It is same for all the places on the Earth.

It is greater at the Poles than the equator because of the oval shape of the Earth.

It is greater at the Equator than the Poles because of the oval shape of the Earth.

It is greater at the hill top than at the sea level because of the increase in altitude.

Clear selection

What is the Mass of the Earth ?

1 point

5.972 × 10^24 kg

6.39 × 10^23 kg

1.898 × 10^27 kg

4.867 × 10^24 kg

Clear selection

The acceleration due to gravity of a planet depends on the :

1 point

Mass of the planet only

Radius of the planet only.

Both Mass and the Radius of the planet

Mass, Radius and orbital period of the planet

Clear selection

Which of the following statements is true when a body is having a free fall on the Earth?

1 point

Its Mass Vanishes.

Its Density vanishes.

Its Weight vanishes

Both its Mass and Weight remains the same.

Clear selection

Astronauts inside an earth orbiting satellite experience weightlessness condition. This is because :

1 point

The gravity vanishes at very high altitudes.

Earth's gravity at very high altitude is exactly balanced by the combined gravity of the Sun, Moon and the Stars.

The satellite is always having a free fall towards the Earth due to its circular motion around the Earth.

Normally, the earth orbiting satellites are placed at the Lagrange Points between the Earth and the Sun

Clear selection

Who first conducted an accurate and sensitive experiment to determine the Value of Universal Gravitational Constant (G)?

1 point

Robert Hooke

Isaac Newton

Henry Cavendish

Galileo

Clear selection

When the weight of a person becomes zero on the Earth ?

1 point

During a dip in the sea

During Free Fall

While going up in an Elevator

The weight of a person can never become zero on Earth

Clear selection

Why the force of gravitation between two bodies is a weak force?

1 point

Large mases are not involved.

The value of Universal Gravitational Constant (G) is very small.

The distance between the bodies cannot be made infinitely small.

The value of Acceleration due to gravity (g) is very small.

Clear selection

Under which circumstance, the gravitational force between two bodies is quite large and appreciable?

1 point

When the distance between the two bodies is made infinitely small.

When the experiment is conducted at the Poles where the value of 'g' is relatively larger.

When the value of Acceleration due to gravity (g) is very large.

When very large masses are involved.

Clear selection

Suppose a man purchased some gold at the Equator and sold it at the Poles. Assuming that the same rate prevails at both the places, he will be richer or poorer ?

1 point

Poorer ; because the gold will weigh less at the Poles because of a lower value of 'g'.

Poorer; because the gold will weigh less at the Poles; because it will contract to occupy lesser volume at the cold conditions of the Poles.

Richer; because the gold will weigh more at the Poles because of a higher value of 'g'.

Richer; because the gold will weigh more at the Poles because of a lower value of 'g'.

Clear selection

Newton discovered the force of gravity from an apple fall in his backyard. One may reason that , when the apple falls towards the Earth, the Earth also should fall towards the apple because action and reaction forces are equal in magnitude. But this never happens. Why?

1 point

The Earth being much more massive than the apple, the acceleration of the Earth towards the apple is practically negligible.

It is practically impossible to see the Earth moving towards the apple.

The Earth, being surrounded by the atmosphere, it undergoes more air air resistance that greatly decrease its motion.

Because the Earth is a much larger body , its motion in space is not perceivable.

Clear selection

How are the tides formed on the seas of the Earth ?

1 point

Due to the gravitational attraction of the Moon alone on the seas of the Earth

Due to the gravitational attraction of the Sun alone on the seas of the Earth

Due to the gravitational attraction of the Sun , the Moon and other planets on the seas of the Earth

Due to the combined gravitational attraction of the Sun and the Moon on the seas of the Earth

Clear selection

For the Moon to move around the Earth. the necessary Centripetal force is provided by the gravitational force of attraction between the Sun and the Moon. If the gravitational force suddenly vanishes , how would the Moon move ?

1 point