Gravitation Test

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Gravitation Test - 1

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Question 1
1 / -0

The S. I unit of G is

A
Nm/kg²

B
N²m/kg

C
Nkg²/m²

D
Nm²/kg²

Solution

Explanation:
Universal gravitational constant is represented by ‘G’. S.I. unit of universal gravitational constant is Nm²/Kg² . As G=Fxr²/Mm.
Question 2
1 / -0

Inverse square law means F α?

A
1/r³

B
1/r⁴

C
1/r²

D
1/r

Solution

Explanation:

The force acting on two bodies is inversely proportional to square of the distance between them. Therefore,Fα 1/r².
Question 3
1 / -0

What is ratio of the force of gravitation between two mases m¹ and m² kept at a distance R on the Earth and on the moon?

A
6:1

B
1:1

C
none of these

D
1:6

Solution

Explanation:

Force of gravitation is equal to product of masses divided by square of the distance between them. So, force of gravitation between two bodies will be same irrespective of their place. Ratio will be 1:1.
Question 4
1 / -0

The value of G depends on

A
none of these

B
masses of the bodies

C
distance between the bodies

D
some other masses kept nearby

Solution

Explanation:

The value of universal gravitational constant (G) is 6.67×10−11Nm2/Kg. Which is constant and independent of mass, distance between the bodies and other factors.
Question 5
1 / -0

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
1:1

B
M/m

C
Mr/M

D
m/M

Solution

Explanation:

Gravitational force between two bodies F =G Mm/r². The value of force exerted on m due to M will be equal to that of M due to m. so, the ratio will be 1;1.
Question 6
1 / -0

Which of the two statements is true?

Statement A: The force of gravitation may be attractive or repulsive.

Statement B: Inverse square law means Fα1/r².

A
statement A

B
both a and b

C
neither a nor b

D
statement B

Solution

Explanation:

The force of attraction is always attractive. Law of inverse square means that the force by which two objects attracts each other is inversely proportional to square of the distance between them.
Question 7
1 / -0

Newton’s law of gravitation is valid in

A
only on the Earth

B
only in our solar system

C
Everywhere

D
laboratory

Solution

Explanation:

Newton’s law of gravitation or universal law of gravitation is valid everywhere, in laboratory, on earth surface, or on other solar system.
Question 8
1 / -0

“The value of G one – sixth on moon as compared to that on the earth” The above statement is

A
true

B
partially true

C
not find out yet

D
false

Solution

Explanation:

The value of G, universal gravitational constant remain same everywhere. So, value of G is equal at both earth and moon. Hence, above statement is false.
Question 9
1 / -0

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)

D
(iii) & (iv)

Solution

Explanation:

According to universal law of gravitation the force is directly proportional to product of their masses and inversely proportional to square of the distance between them.

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Gravitation Test - 1

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Gravitation Test - 1

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Question 1

Nm/kg2

N2m/kg

Nkg2/m2

Nm2/kg2

Solution

Question 2

1/r3

1/r4

1/r2

1/r

Solution

Question 3

6:1

1:1

none of these

1:6

Solution

Question 4

none of these

masses of the bodies

distance between the bodies

some other masses kept nearby

Solution

Question 5

1:1

M/m

Mr/M

m/M

Solution

Question 6

statement A

both a and b

neither a nor b

statement B

Solution

Question 7

only on the Earth

only in our solar system

Everywhere

laboratory

Solution

Question 8

true

partially true

not find out yet

false

Solution

Question 9

None of the above

(ii) & (iii)

(i) and (ii)

(iii) & (iv)

Solution

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Nm/kg²

N²m/kg

Nkg²/m²

Nm²/kg²

1/r³

1/r⁴

1/r²