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School
Name:____________________________________
Student Name:______________________
Subject: Physics
Class:______9th Section:___________ Roll No:______
Total Marks:_____________ Obtain
Marks:______________
Q.1. Choose the correct Option Form the following Multiple Choice
Question.
7
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1.
The value of
gravitational field strength near the surface of the earth is:
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20 N kg-1
|
30 N kg-1
|
5 N kg-1
|
10 N kg-1
|
2.
Earth’s
gravitational force of attraction vanishes at:
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6400 km
|
Infinity
|
42300 km
|
1000km
|
3.
The idea of
gravity was put up first by:
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Einstein
|
Hooke
|
Newton
|
Galileo
|
4.
The value of
mass of earth is :
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6×10-24kg
|
6×1024kg
|
6.63×1024kg
|
6.63×10-24kg
|
5.
The value of
g on moon’s surface is 1.6ms-2. What will be the weight of a 100kg
body on the surface of moon
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3.7 ms-2
|
7.3 ms-2
|
37.3 ms-2
|
8.7 ms-2
|
6.
The orbital
speed of a low orbit satellite is :
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80 ms-1
|
8 ms-1
|
800 ms-1
|
8000 ms-1
|
7.
The height of
geostationary satellite is about:
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850km
|
1000km
|
6400km
|
42300km
|
Q.2. Write the short answer of the
following question? 7*2=14
1.
State
newton’s law of gravitation?
2.
Define
gravitational field?
3.
Define
force of gravitation?
4.
Why is
the value of g different at different place?
5.
What
is meant by a satellite?
6.
What
is meant by global positioning system(GPS)?
7.
Define
orbital velocity and write its formula?
Q.3. Write the detailed Answers of
the following Questions . 5+4=9
1.
State
newton’s law of gravitation and derive its equation?
2.
Define
the force of gravitation. Determine the mass of earth using the law of
gravitation?
