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WorksheetsGravitation
Total questions: 15
Worksheet time: 8mins
The atmosphere is held to the earth by:
Winds
gravity
clouds
None of these
Gravitational forces are:
always attractive
always repulsive
sometimes attractive and sometimes repulsive
None of these
Which of the following is the evidence to show that there must be a force acting on earth and directed towards the sun:
deviation of the falling bodies towards east
revolution of earth around the sun
phenomena of day and night
apparent motion of sun round the earth
The gravitational force between two objects does not depend on:
Sum of the masses
Product of the masses
Gravitational constant
(a)Distance between the masses
The mass of the moon is about 1.2% of the mass of the earth. Compared to the gravitational force the earth exerts on the moon, the gravitational force the moon exerts on earth:
Is the same
Is smaller
Is greater
Varies with its phase
A spherical planet far out in space has a mass M0 and diameter . D0 A particle of mass m falling freely near the surface of this planet will experience an acceleration due to gravity which is equal to:
GM0/ D02
4GM0/ D02
GM0/ 2D02
4GM0/ 3D02
If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth's surface would:
Decrease by 2%
Remain unchanged
Increase by 2%
Increase by 1%
The radii of two planets are respectively R1 and R2 and their densities are respectively ρ1 and ρ2 . The ratio of the accelerations due to gravity at their surfaces is:
g1 : g2 = (ρ1 / R1) ∙ (ρ2 / R2)
g1 : g2 = R1R2 : ρ1ρ2
g1 : g2 = R1 ρ2 : R2 ρ1
g1 : g2 = R1 ρ1 : R2 ρ2
Where will it be profitable to purchase 1 kg sugar (by spring balance)
At poles
At equator
At 45° latitude
At 60°latitude
The acceleration due to gravity at pole and equator can be related as:
gp < ge
gp = ge = g
gp < ge = g
gp > ge
The weight of body at earth's surface is W. At a depth half way to the centre of the earth, it will be (assuming uniform density in earth):
W
W /2
W /4
Zero
An iron ball and a wooden ball of the same radius are released from a height h in vacuum. They both take same time to reach the ground. The correct answer to above statement is based on :
Acceleration due to gravity in vacuum is same irrespective of size and mass of the body
Acceleration due to gravity in vacuum depends on the mass of the body
There is no acceleration due to gravity in vacuum
In vacuum there is resistance offered to the motion of the body and this resistance depends on the mass of the body
The weight of an object in the coal mine, sea level, at the top of the mountain are W1, W2
and W3
W1 < W2 > W3
W1 = W2 = W3
W1 < W2 < W3
W1 > W2 > W3
At the surface of a certain planet, acceleration due to gravity is one-quarter of that on earth. If a brass ball is transported to this planet, then which one of the following statements is not correct:
The mass of the brass ball on this planet is a quarter of its mass as measured on earth
The weight of the brass ball on this planet is a quarter of the weight as measured on earth
The brass ball has the same mass on the other planet as on earth
The brass ball has the same volume on the other planet as on earth
A spring balance is graduated on sea level. If a body is weighed with this balance at consecutively increasing heights from earth's surface, the weight indicated by the balance:
Will go on increasing continuously
Will go on decreasing continuously
Will remain same
Will first increase and then decrease
