Question Bank for 9th Class Science Gravitation and Floatation Gravitation

Gravitation Total Questions - 40

1)

Calculate the force of gravitation due to earth on a man weighing 100 kg standing on the ground? (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth\[=\,6.4\times {{10}^{3}}km\])

A)
977 N

B)
1000 N

C)
1230 N

D)
1524 N

E)
None of these
View Solution
2)

Who discovered gravitational force?

A)
Sir Isacc Newton

B)
Robert Hook

C)
Robert Brown

D)
James Chadwick

E)
None of these
View Solution
3)

What do we called the upward force acting on an object immersed in the liquid?

A)
Mechanical force

B)
Electrical force

C)
Buoyant force

D)
Gravitational force

E)
None of these
View Solution
4)

The weight of on object on the earth is 60 N. What will be its weight on the moon?

A)
10 N

B)
6 N

C)
1.6 N

D)
       1.2 N

E)
None of these
View Solution
5)

There are four objects of equal mass at a distance of 4m, 8m 6m and 10m from a pole. Which object will have maximum force of attraction with the pole?

A)
The object which is 4 m away from the pole

B)
The object which is 8 m away from the pole

C)
The object which is 6 m away from the pole

D)
The object which is 10 m away from the pole

E)
None of these
View Solution
6)

What is the value of acceleration due to gravity on the earth?

A)
\[9.8\,m/{{s}^{2}}\]

B)
\[6.8\,m/{{s}^{2}}\]

C)
\[5.8\,m/{{s}^{2}}\]

D)
       \[4.9\,m/{{s}^{2}}\]

E)
None of these
View Solution
7)

What is the value of universal gravitational constant?

A)
\[5.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\]

B)
\[6.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\]

C)
\[4.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\]

D)
\[3.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\]

E)
None of these
View Solution
8)

Which of the following will require least force to penetrate the piece of wood?

A)
Sharp iron nail

B)
Blunt Iron rod

C)
Thin sheet of steel

D)
A Hammer

E)
None of these
View Solution
9)

In vacuum, all freely falling objects have:

A)
Same acceleration

B)
Same speed

C)
Same momentum

D)
same force

E)
None of these
View Solution
10)

Which one of the following formula is correct for pressure?

A)
\[p\frac{F}{A}\]

B)
\[P=FA\]

C)
\[P=F+A~~~~~~~~\]

D)
\[P=F-A\]

E)
None of these
View Solution
11)

The value of universal Gravitational constant was first determined by:

A)
Gregor Mendel

B)
Ernst Haeckel

C)
Henry Cavendish

D)
Isaac newton

E)
None of these
View Solution
12)

The gravitational force between a man weighing 68 kg and a woman weighing 52 kg standing 4 metres apart.

A)
\[1.2\,\times \,{{10}^{-11}}N\]

B)
\[1.48\,\times \,{{10}^{-9}}N\]

C)
\[1.48\,\times \,{{10}^{-8}}N\]

D)
\[150\,\times \,{{10}^{-11}}N\]

E)
None of these
View Solution
13)

A particle is released from rest from a height. Find the distance it falls through in 5 second.

A)
102.5 m

B)
122.5 m

C)
108.5 m

D)
109.5 m

E)
None of these
View Solution
14)

Acceleration due to gravity is ____ when an object is thrown vertically upwards.

A)
Zero

B)
Positive

C)
Negative

D)
       Either [a] or [b]

E)
None of these
View Solution
15)

Unit of universal gravitational constant is:

A)
\[N\,{{m}^{2}}\,k{{g}^{2}}\]

B)
\[N\,{{m}^{2}}\,/k{{g}^{2}}\]

C)
\[N\text{ }m\text{ }k{{g}^{2}}\]

D)
       \[N\text{/}{{m}^{2}}\text{ }k{{g}^{2}}\]

E)
None of these
View Solution
16)

Law of gravitation gives the gravitational force between:

A)
The earth and a point mass only.

B)
The earth and sun only.

C)
Any two bodies having some mass.

D)
Two charged bodies only.

E)
None of these
View Solution
17)

The force with which the earth attracts an object is called ____ of the object.

A)
Mass

B)
Weight

C)
Acceleration

D)
       Distance

E)
None of these
View Solution
18)

Find the weight of a person whose mass is 72 kg.

A)
705.6 N

B)
700 N

C)
800 N

D)
70 N

E)
None of these
View Solution
19)

A stone is dropped from a point at 3 : 30 : 32 p.m (hour : minute : second). Another stone is dropped from the same point at 3 : 30 : 34 p.m. Find the separation between the stones at 3 : 30 : 35 p.m.

A)
50 m

B)
39.2 m

C)
100 m

D)
       48 m

E)
None of these
View Solution
20)

In whose honour the S.I unit of pressure is named?

A)
Isaac newton

B)
Blaise pascal

C)
Archimedes

D)
       Kepler

E)
None of these
View Solution
21)

Which one of the following principles tells us that buoyant force acting on an object is equal to weight of the fluid displaced by that object?

A)
Kepler?s principle

B)
Archinedes? principle

C)
Newton's law

D)
Pascal's law

E)
None of these
View Solution
22)

The acceleration due to gravity on the surface of a planet whose mass is same as that of the earth and radius is half of that of the earth is: (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth \[=\,6.4\,\times \,{{10}^{3}}\,km)\]

A)
\[35.08\,m/{{s}^{2}}\]

B)
\[39.08\,m/{{s}^{2}}\]

C)
\[28.08\,m/{{s}^{2}}\]

D)
\[9.08\,m/{{s}^{2}}\]

E)
None of these
View Solution

Column A	Column B
(i) Gravity	[A] Forces involved are very small.
(ii) Gravitation	[B] Matter contained in a body.
(iii) Weight	[C] S. I involved are large.
(iv) Mass	[D] Forces involved are large.

(i - A), (ii - D), (iii - B), (iv - C)

(i - D), (ii - A), (iii - B), (iv - C)

(i - D), (ii - A), (iii - C), (iv - B)

(i - A), (ii - C), (iii - D), (iv - B)

None of these

View Solution

24)

When the distance between two objects is increased, the force of attraction between them will:

A)
Decrease

B)
Increase

C)
Either [a] or [b]

D)
Do not change

E)
None of these
View Solution
25)

Three balls P, Q and R are kept in a straight line. The separation between P and R is 1m, and Q is placed at the midpoint between them. The masses of P, Q, R are 200 g, 300 g and 400 g respectively. Find the net gravitational force on P, Q and R respectively.

A)
\[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N\]

B)
\[4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N,\,8.28\times {{10}^{-13}}N\]

C)
\[5.20\times {{10}^{-12}}N,\,7.63\times {{10}^{-11}}N,\,6.23\times {{10}^{-11}}N\]

D)
\[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,6.52\times {{10}^{-12}}N\]

E)
None of these
View Solution
26)

Few characteristics of a quantity are given below. Find out the name of the quantity.

(i) It is zero at the centre of the earth.

(ii) It is measures with a spring balance.

(iii) It is a vector quantity.

(iv) It's direction is towards the centre of the earth.

A)
Pressure

B)
Weight

C)
Mass

D)
       Kilogram

E)
None of these
View Solution
27)

____ is the measures of inertia of a body.

A)
Weight

B)
Mass

C)
Inertia

D)
       Time

E)
None of these
View Solution
28)

Which one of the following is correct?

A)
Universal gravitational constant [G] is a vector quantity.

B)
The value of G varies from place to place.

C)
The value of G does not depend upon the nature of the medium between the two bodies.

D)
The value of G depends on the masses of the bodies.

E)
None of these
View Solution
29)

A man drops a pencil from a height 2 m. With what speed does it strike the ground?

A)
63 m/s

B)
6.5 m/s

C)
6.26 m/s

D)
       6.9 m/s

E)
None of these
View Solution
30)

If masses of two bodies are halved and the distance between them is doubled, what effect do they have on the gravitational force between the masses?

A)
1/16 F

B)
1/8 F

C)
2 F

D)
       F

E)
None of these
View Solution
31)

As we go below the surface of the earth, the acceleration due to gravity ____.

A)
Goes on decreasing

B)
Goes on increasing

C)
Remains constant

D)
Either [a] or [b]

E)
None of these
View Solution
32)

The final velocity of a body moving against gravity when it attains the maximum height is:

A)
h/t

B)
h

C)
2 gh

D)
       Zero

E)
None of these
View Solution
33)

A ball is dropped from the top of a building which takes 10 s to reach the ground. What is the height of the building?

A)
420 m

B)
400 m

C)
78.4 m

D)
490 m

E)
None of these
View Solution
34)

S.I. unit of weight is:

A)
Kilogram

B)
Newton

C)
\[M/{{s}^{2}}\]

D)
       \[M/s\]

E)
None of these
View Solution
35)

The force of gravitation between two bodies in the universe does not depend on:

A)
The product of their masses

B)
The gravitational constant

C)
The distance between them

D)
The sum of their densities

E)
None of these
View Solution
36)

Two protons kept at a separation of 1 fem to meter\[(1fm\,\,={{10}^{-15}}m)\]. The gravitational force between two protons is: (mass of proton\[=1.7\times {{10}^{-27}}kg\])

A)
\[1.6\times {{10}^{-36}}\,N\]

B)
\[1.86\times {{10}^{-34}}N\]

C)
\[1.19\times {{10}^{-35}}N\]

D)
\[1.62\times {{10}^{-35}}N\]

E)
None of these
View Solution
37)

The weight of an object of mass 10 kg at the centre of the earth is ____.

A)
98 kg

B)
Zero

C)
140 N

D)
       98 N

E)
None of these
View Solution
38)

The force per unit area is called:

A)
Pascal

B)
Pressure

C)
Buoyant force

D)
Weight

E)
None of these
View Solution
39)

Find the mass of an object whose weight on earth is 98 N.

A)
98 kg

B)
10 kg

C)
120 kg

D)
       110 kg

E)
None of these
View Solution
40)

The atmosphere is held to the earth by.

A)
Magnetic field of earth

B)
Clouds

C)
Wind

D)
                   Gravity

E)
None of these
View Solution

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9th Class Science Gravitation and Floatation Question Bank

done Gravitation Total Questions - 40

Download Complete Course

Gravitation Total Questions - 40