Work Sheet MCQs 1. Who was the man who came up with idea of gravity is a) Bohar b) Newton ...
Work Sheet
MCQs
1.
Who was the man who came up
with idea of gravity is
a)
Bohar b) Newton c) Einstein
2.
When was this mystery
happened?
a)
1665 b) 1996 c)
1886
3.
According to law of
gravitation everybody attracts
a)
Earth b) every other body c) itself
4.
Unit of ‘G’ is
a)
Nkgm2 b) Nm2kg-2 c) Nkg2m2
5.
The value of ‘G’ is
a)
6.673×10-9 b) 6.673×10-10 c) 6.673×10-11
6.
Weight of every object is
due to
a)
Earth b) water c) air
7.
Law of gravitation is valid
for the objects
a)
In contact of earth b) not
in contact of earth c) both a and b
8.
The earth’s gravitational
field is always
a)
Inward b) Out ward c)
both a and b
9.
Mass of earth is equal to
a)
6.0×1024 kg b) 6.0×1021 kg c) 6.0×1025kg
10.
If the height is increased
then gravitational acceleration is
a)
Increased b) decreased c) remains same
11.
Value of g on the surface
of Sun is
a)
100 ms-2 b) 200 ms-2 c) 274 ms-2
12.
The height of geostationary
satellite is about
a)
43000 km b) 42300 km c) 40000km
13.
A geostationary satellite
complete its circle around the earth in
a)
10 hour b) 20 hour c) 24 hour
14.
No. of satellites are used
to cover complete earth are
a)
3 b) 5 c)
8
15.
Moon is ---------------km
away from the earth
a)
300000 b) 380000 c) 340000
16.
Moon complete one
revolution around the earth in
a)
27.3 days b) 28.3 days c) 30 days
17.
A satellite revolving
around very closed to earth is
a)
7 kms-1 b) 8 kms-1 c) 10 kms-1
18.
Earth’s gravitational force
of attraction vanishes at
a)
6400 km b) 1000 km c) 42300 km
19.
The value of g at a height
one earth’s radius above the surface of
the earth is
a)
2 g b) ½ g c)
¼ g
20.
The gravitational field
strength near the surface of the earth is
a)
20 Nkg-1 b) 10 Nkg-1 c) 30 Nkg-1
Short Questions:
1)
Who and when was given the
idea of gravity?
2)
What is gravitational
force?
3)
What is the law of
gravitation?
4)
Write the formula of law of
gravitation?
5)
What is gravitational
field?
6)
What is meant by
gravitational field strength?
7)
How to find the mass of
earth?
8)
What happened to the value
of g is object is at some height?
9)
What is the artificial
satellite?
10)
Why law of gravitation is
important to us?
11)
What happened to the value
of g when object is placed at some height?
12)
On what factor orbital
speed of satellite depends?
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