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Physics 9 Chapter 5 - Gravitation - 14
1.
How many times satellites of GPS revolve around the earth?
a) Three times a day
b) One time a day
c) Four times a day
d) Two times a day
2.
What is the speed of satellites of GPS?
a) 3.87 ms
-1
b) .87 kms
-1
c) 27.3 kms
-1
d) 27.3 ms
-1
3.
A polar satellite is launched at 850 km above Earth. Find its orbital speed?
a) 7431 ms
-1
b) 7.431 ms
-1
c) 743.1 ms
-1
d) 74.31 ms
-1
4.
Which force a satellite requires moving around the earth?
a) Centripetal force
b) Friction force
c) Gravitational force
d) Centrifugal force
5.
How many kilometres Moon is away from the earth?
a) 8,000 km
b) 3,80,000 km
c) 38,000 km
d) 3,800 km
6.
Moon is nearly 3,80,000 km away from the................?
a) Mercury
b) Venus
c) Earth
d) Sun
7.
What is the formula for necessary centripetal force?
a) Fc = mv
2
x r
o
b) Fc = mv
2
/ r
o
c) Fc = mv
2
- r
o
d) Fc = mv
2
+ r
o
8.
What is the speed of a satellite revolving around very close to the Earth?
a) 8 kms
-1
b) 2.9 kms
-1
c) 80 kms
-1
d) 29 kms
-1
9.
What is the speed of a satellite revolving around very close to the Earth?
a) 2900 kmh
-1
b) 8000 kmh
-1
c) 80000 kmh
-1
d) 29000 kmh
-1
10.
Which of the formula gives the velocity for a satellite revolving close to the Earth?
a) Formula: v = √(g x R)
b) Formula: v = √(g + R)
c) Formula: v = √(g - R)
d) Formula: v = √(g R)
11.
What is the orbital speed of a low orbit satellite?
a) 8000 ms
-1
b) 8 ms
-1
c) 800 ms
-1
d) Zero
12.
A communication satellite is launched at 42000 km above Earth. Find its orbital speed?
a) 287.6 ms
-1
b) 2876 ms
-1
c) 28.76 ms
-1
d) 2.876 ms
-1
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