# Gravity Quiz for Fun & Quiz Competition Practice

Gravity Quiz is here,

## Results

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### #1. What's the escape velocity for a particle to escape the gravitational field of earth?

### #2. Which of the following statements is true?

### #3. Which of the following is true for gravitational force?

### #4. Unit of universal gravitational constant is

### #5. Which is a statement of Kepler's second law?

Explanation is given below

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## Gravity Quiz Explanations

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- Escape velocity for a body to escape the

gravitational field of earth is 11.2 km per second

(kps). Don’t confuse it with kph as that’s km per

hour which is, in fact, very slow for an escape

velocity. - All statements are true.
- Gravitational force is a conservative force.

Therefore, the work done by it is path

independent. - F = GMm/(r^2)

or, G = F.(r^2)/Mm

So, the unit is N.(m^2)/(kg^2). - Kepler’s 2nd law (Law of areas) states that

the speed of the planet is minimum when it is

farthest from the sun. It is maximum when the

planet is closest to the sun. - SI unit of gravitational potential is joule/kg.

So, its CGS unit is erg/gram. - All the planets move in elliptical orbits with

the sun situated at one of the foci of the ellipse,

according to Kepler’s 1st law of planetory

motion (law of orbits). - The product of gravitational potential and

mass of the body gives gravitational potential

energy. - The value of G was given by scientist Henry

Cavendish in 1798. - Graviton is the hypothetical particle that is

supposed to be mediating the gravitational

interaction, which is the weakest interaction of

all the four fundamental forces.

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Uploaded by Bhautik Kapadiya

## Gravitation Quiz and answers

- What’s the escape velocity for a particle to

escape the gravitational field of earth?

a. 11.2 kph

b. 9.8 kph

c. 11.2 mps

d. 11.2 kps () - Which of the following statements is true?

a. escape speed is independent of projection

of the body from the surface of the planet

b. escape speed is dependent on the mass of

the planet

c. escape speed is independent of the mass of

the body that is projected

d. all of the above () - Which of the following is true for gravitational

force?

a. it’s not a conservative force

b. it depends on the nature of the intervening

medium

c. work done by this force is path

independent ()

d. none of the above

- Unit of universal gravitational constant is

a. N (m^-2) (kg^2)

b. N (m^2) (kg^-2) ()

c. J m (kg^-3)

d. erg cm kg^-1 - Which is a statement of Kepler’s second law?

a. speed of the planet is minimum when it is

farthest from the sun ()

b. speed of the planet is maximum when it is

farthest from the sun

c. speed of the planet is minimum when it is

closest to the sun

d. none of the above - What is the CGS unit of gravitational

potential?

a. dyne/ gram

b. erg/ gram ()

c. erg/ cm

d. dyne.cm.gram - All the planets move in
**_**orbits around

the sun.

a. parabolic

b. circular

c. hyperbolic

d. none of the above ()

- Gravitational potential energy is
**_**

a. gravitational potential X mass of the body

()

b. gravitational potential X radius of the body

c. gravitational potential/ mass of the body

d. none of the above - The value of universal gravitational constant

G was determined experimentally by.*__*

a. Isaac Newton

b. Galileo Galilei

c. Henry Cavendish ()

d. Johannes Kepler - Which of the following particles is the carrier

of gravitational interaction?

a. gluon

b. muon

c. higgs boson

d. none of the above ()

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