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physics-9-chapter-4-turning-effect-of-force-8
1.
What is the height of an object above sea level called?
a) Altitude
b) Amplitude
c) Length
d) Weight
2.
The value of g is 4.0 ms
-2
at a distance of 10000 km from the centre of the Earth. Find the mass of the Earth?
a) 5.99 x 10
24
Kg
b) 5.99 x 10
22
Kg
c) 5.99 x 10
21
Kg
d) 5.99 x 10
20
Kg
3.
What is the height of a place above sea level called?
a) Altitude
b) Amplitude
c) Length
d) Weight
4.
With increase in which of the following, the weight of body decreases?
a) Height from the surface of the Earth
b) Gravitational constant
c) Value of ‘G’
d) Mass of earth
5.
Where the value of ‘g’ is greater?
a) At sea level
b) At hills
c) At mountains
d) At peaks of mountains
6.
Consider a body of mass m at an altitude h. The distance of the body from the centre of the Earth becomes................?
a) R + h
b) R - h
c) R / h
d) R x h
7.
Which of the following formula is correct for gravity at an altitude ‘h’?
a) Formula: g
h
= (G Me) / (R + h)
2
b) Formula: g
h
= (G Me) + (R / h)
2
c) Formula: g
h
= (G Me) / (R - h)
2
d) Formula: g
h
= (G Me) - (R / h)
2
8.
The value of g on moon’s surface is 1.6 ms
-2
. What will be the weight of a 100 kg body on the surface of the moon?
a) 160 N
b) 100 N
c) 1000 N
d) 1600 N
9.
At a height equal to one Earth radius above the surface of the Earth, g becomes ......................of its value on the Earth?
a) One fourth
b) One fifth
c) One ninth
d) One tenth
10.
Value of g increases with the...................?
a) decrease in altitude
b) Increase in mass of the body
c) Increase in altitude
d) None of the above
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