Gravitation Test

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Gravitation Test - 7

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following is an application of Earth’s gravitation
A It holds atmosphere around our globe.
B It holds us firmly on the surface of the Earth.
C It is responsible for motion of moon.
D It is responsible for sea tides due to the moon.

A
(a) and (b) are correct

B
(b) and (c) are correct

C
(a), (b) and (c) are correct

D
All of these

Solution

Gravitational force although invisible or rarely felt but it holds all the bodies and earth atmosphere firmly. It is also responsible for the revolution of the moon around the earth. Gravity is also the cause of tides.
Question 2
1 / -0

The value of ‘g’ at the mount Everest is

A
= g

B
< g

C
>g

D
zero

Solution

The value of 'g' at the mount everest is < g (acceleration due to gravity on earth surface) because with increase in height, gravitational force of earth decreases.
Question 3
1 / -0

A ball thrown up vertically returns to the ground after 10 second. Find the velocity with which it was thrown up? (g = 10m/s²g)

A
1m/s

B
10m/s

C
100m/s

D
50m/s

Solution

Time taken to reach at highest point = 10/2 = 5s. Value of g = 10m/s². Final velocity (v) = 0 at heigh point.
V= u + gt
0 = u + (-10) 5
0= u - 50
u = 50 m/s
Question 4
1 / -0

Drop an iron nail and a sheet of paper from the roof of your house. Which of the two will reach the ground first?

A
sheet of paper

B
an iron nail

C
both simultaneously

D
neither sheet of paper nor iron nail

Solution

Although the force by which iron nail and a sheet of paper is attracted towards the earth is equal. The more air friction is faced by sheet of paper due to larger size. So, iron nail will reach the ground first.
Question 5
1 / -0

Find the incorrect statement ?

A
the value of g at the surface of the Earth is 9.8 m/s²

B
the value of ‘g’ decreases with height

C
the value of ‘g’ increases with depth.

D
the value of ‘g’ is more at poles and less at equator.

Solution

Value of g depends upon mass of earth and the distance between the centre of the object and earth. As depth increases, the value of acceleration due to gravity falls.
Question 6
1 / -0

Which of the following statement is incorrect?

A
When a body is dropped freely from a height its initial velocity is zero.

B
When a body is throne vertically upward the value of acceleration due to gravity is negative

C
When a body is thrown vertically upward its final velocity become zero.

D
None of these

Solution

When a body is dropped freely from a height its initial velocity is zero and thrown vertically upward its final velocity becomes zero and acceleration due to gravity is negative in case of body thrown vertically upward.
Question 7
1 / -0

“When an apple is thrown up earth attract the apple but the apple does not attract the earth” The above written statement is

A
true

B
false

C
partially true

D
partially false

Solution

Gravitational force between earth and apple is equal but attraction takes place towards the body of heavier mass. So, apples is attracted by earth but earth is not attracted by apple.

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Gravitation Test - 7

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Gravitation Test - 7

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Question 1

(a) and (b) are correct

(b) and (c) are correct

(a), (b) and (c) are correct

All of these

Solution

Question 2

= g

< g

>g

zero

Solution

Question 3

1m/s

10m/s

100m/s

50m/s

Solution

Question 4

sheet of paper

an iron nail

both simultaneously

neither sheet of paper nor iron nail

Solution

Question 5

the value of g at the surface of the Earth is 9.8 m/s2

the value of ‘g’ decreases with height

the value of ‘g’ increases with depth.

the value of ‘g’ is more at poles and less at equator.

Solution

Question 6

When a body is dropped freely from a height its initial velocity is zero.

When a body is throne vertically upward the value of acceleration due to gravity is negative

When a body is thrown vertically upward its final velocity become zero.

None of these

Solution

Question 7

true

false

partially true

partially false

Solution

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the value of g at the surface of the Earth is 9.8 m/s²