Physics class ix notes 9th class board pattern model paper
Physics Chapter No-05 Important questions, if you attempt these question you will get InshaAllah 100% marks.
Objective
Part
Choose the right option.
10×1=10
A
|
B
|
C
|
D
|
||
1
|
The first man
who came up with the idea of gravity:
|
Bohr
|
Einstein
|
Newton
|
Rutherford
|
2
|
The value of
universal constant of gravitation G is:
|
6.673×10-11 Nm2kg-2
|
6.673×10-9 Nm2kg-2
|
6.673×10-11 Nm-2kg2
|
6.673×10-11 Nm-2kg-2
|
3
|
The
gravitational force is also called:
|
Electric force
|
Field force
|
Magnetic force
|
None of these
|
4
|
A global
positioning system consists of:
|
6 earth satellites
|
12 earth satellites
|
18 earth satellites
|
24 earth satellites
|
5
|
Gravitational force is:
|
Contact force
|
Non contact force
|
Zer limiting force
|
None of these
|
6
|
The distance
of moon from the earth is nearly:
|
38,00,00,000km
|
380,00,000 m
|
3,80,00,000cm
|
3,80,000km
|
7
|
Value of g
increases with the:
|
Increase in mass of
the body
|
Increase in altitude
|
Decrease in altitude
|
None of these
|
8
|
The weight of
a body is due to the:
|
Centripetal force
|
Centrifugal force
|
Gravitational force
|
Elastic restoring
force
|
9
|
The mass of
earth is equal to
|
6×1018 kg
|
6×1024 g
|
6×1022 kg
|
6×1024 kg
|
10
|
Earth completes its one rotation
about its axis in:
|
12 hours
|
24 hours
|
48 hours
|
72 hours
|
Subjective
Answer
the following short questions. 10×2=20
1.
State the law of gravitation.
2.
What is GPS and what is its function?
3.
Why earlier scientist could not guess
about the gravitational force?
4.
What are artificial satellites and what
are their functions?
5.
Why does the value of g vary from place
to place?
6.
Why law of gravitation is important to
us?
7.
Do you attract the Earth or the Earth
attracts you? Which one is attracting with a larger force?
8.
Why communication satellites are
stationed at geostationary orbits?
9.
What is a field force?
10.
Why we do not feel the force of
attraction between the objects?
Long Questions 5×1=5
1.
(a) How the mass of Earth can be
determined. Explain.
3
(b) Find the gravitational force of attraction between two spheres each of mass 1000 kg. The distance between the centers of the sphere is 0.5m? 2
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