Gravitation Test

Gravitation

This is Gravitation Test-01 for CBSE class 09 Science.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
The S. I unit of G is
  • A
    \({\text{Nk}}{{\text{g}}^{\text{2}}}/{{\text{m}}^{\text{2}}}\)
  • B
    \({\text{N}}{{\text{m}}^{\text{2}}}/{\text{k}}{{\text{g}}^{\text{2}}}\)
    Correct
  • C
    \({\text{Nm}}/{\text{k}}{{\text{g}}^{\text{2}}}\)
  • D
    \({{\text{N}}^{\text{2}}}{\text{m}}/{\text{kg}}\)
2
Inverse square law means F α?
  • A
    \(\frac{1}{{{r^2}}}\)
    Correct
  • B
    \(\frac{1}{{{r^4}}}\)
  • C
    \(\frac{1}{{{r^3}}}\)
  • D
    \(\frac{1}{r}\)
3
What is ratio of the force of gravitation between two mases \({m^1}\)and \({m^2}\)kept at a distance R on the Earth and on the moon?
  • A
    1:6
  • B
    none of these
  • C
    1:1
    Correct
  • D
    6:1
4
The value of G depends on
  • A
    none of these
    Correct
  • B
    masses of the bodies
  • C
    distance between the bodies
  • D
    some other masses kept nearby
5
Two masses m and M are kept at a distance r. The ratio of the force exerted on m due to M and that of M due to m is equal to
  • A
    m/M
  • B
    M/m
  • C
    Mr/M
  • D
    1:1
    Correct
6
Which of the two statements is true? Statement A: The force of gravitation may be attractive or repulsive. Statement B: Inverse square law means\(F\alpha \frac{1}{r^{2}}\).
  • A
    neither a nor b
  • B
    both a and b
  • C
    statement B
    Correct
  • D
    statement A
7
According universal law of Gravitation (i) Force is directly proportional to product of masses of two bodies (ii) Force is inversely proportional to square of distance between two bodies (iii) Force is directly proportional to square of distance between two bodies (iv) Force is inversely proportional to product of masses of two bodies
  • A
    None of the above
  • B
    (ii) & (iii)
  • C
    (i) and (ii)
    Correct
  • D
    (iii) & (iv)
8
“The value of G one – sixth on moon as compared to that on the earth” The above statement is
  • A
    not find out yet
  • B
    partially true
  • C
    true
  • D
    false
    Correct
9
What is the force of gravitation between two point masses of 1kg and 2kg kept 1 m apart?
  • A
    \({\text{13}}.{\text{34}} \times {\text{1}}{0^{ - {\text{1}}0}}{\text{N }}\)
  • B
    \({\text{13}}.{\text{34}} \times {\text{1}}{0^{ - {\text{11}}}}{\text{N }}\)
    Correct
  • C
    \({\text{12}}.{\text{6}} \times {\text{1}}{0^{ - {\text{1}}0}}{\text{N }}\)
  • D
    \({\text{12}}.{\text{6}} \times {\text{1}}{0^{ - {\text{11}}}}{\text{N }}\)
10
Newton’s law of gravitation is valid in
  • A
    Everywhere
    Correct
  • B
    only in our solar system
  • C
    only on the Earth
  • D
    laboratory
11
How does the force of gravitation between two objects change when the distance between them is reduced to half?
  • A
    becomes four time
    Correct
  • B
    becomes thrice
  • C
    reduced to half
  • D
    becomes one third
12
Which of the following statement are incorrect- A Value of acceleration due to gravity is same at all places B Mass is constant at all places C Weight is constant at all places D Weight of an object can be zero.
  • A
    (b) and (c) are correct
  • B
    (a) and (c) are correct
    Correct
  • C
    All of these
  • D
    (a), (b) and (c) are correct
13
What happens to the force between two objects if the masses of both objects are doubled?
  • A
    force will get twice
  • B
    force will get four times.
    Correct
  • C
    force will get one – fourth
  • D
    force will get half
14
The distance between two particles is decreased. The gravitational force between them
  • A
    increases
    Correct
  • B
    remains the same
  • C
    becomes zero
  • D
    decreases
15
If Ge is the value of universal gravitational constant at the Earth and Gm is the value of universal gravitational constant on the moon then
  • A
    Ge = 6Gm
  • B
    Ge>Gm
  • C
    Ge = Gm
    Correct
  • D
    Ge < Gm