# Gravity Quiz for Fun & Quiz Competition Practice

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## Results

### #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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1. 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.
2. All statements are true.
3. Gravitational force is a conservative force.
Therefore, the work done by it is path
independent.
4. F = GMm/(r^2)
or, G = F.(r^2)/Mm
So, the unit is N.(m^2)/(kg^2).
5. 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.
6. SI unit of gravitational potential is joule/kg.
So, its CGS unit is erg/gram.
7. 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).
8. The product of gravitational potential and
mass of the body gives gravitational potential
energy.
9. The value of G was given by scientist Henry
Cavendish in 1798.
10. 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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1. 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 ()
2. 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 ()
3. 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

1. 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
2. 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
3. What is the CGS unit of gravitational
potential?
a. dyne/ gram
b. erg/ gram ()
c. erg/ cm
d. dyne.cm.gram
4. All the planets move in _ orbits around
the sun.
a. parabolic
b. circular
c. hyperbolic
d. none of the above ()

1. 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
2. The value of universal gravitational constant
G was determined experimentally by
__ .
a. Isaac Newton
b. Galileo Galilei
c. Henry Cavendish ()
d. Johannes Kepler
3. Which of the following particles is the carrier
of gravitational interaction?
a. gluon
b. muon
c. higgs boson
d. none of the above ()