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WorksheetsGrade 9 : Physics
Total questions: 17
Worksheet time: 9mins
A body of mass 1kg is attracted by the earth with a force which is equal to
9.8 N
6.67x 1011
1 N
9.8 m/s
What is the gravitational force between two objects?
attractive at large distances only
attractive at small distances only
attractive at all distances
attractive at large distances but repulsive at small distances
The value of ‘g’
Increases as we go above the earth’s surface
Decreases as we go to the centre of the earth
Remains constant
Is more at equator and less at poles
The mass of the body on moon is 40kg, what is the weight on the earth.
240kg
392N
240N
400kg
Newton’s law of gravitation applies to
Small bodies only
Plants only
All bodies irrespective of their size
For solar system
The distance between two bodies becomes 6 times more than the usual distance. The the F becomes
36 times
6 times
12 times
1/36 times
Two objects of different masses falling freely near the surface of the moon would
have same velocities at any instant
have different acceleration
experience forces of same magnitude
undergo a change in their inertia
A boy is whirling a stone tied to a string in a horizontal circular path. If the string breaks, the stone
will continue to move in the circular path
will move along a straight line towards the centre of the circular path
will move along a straight line tangential to the circular path
will move along a straight line perpendicular to the circular path away from the boy
In the relation F = G M m /d2, the quantity G
depends on the value ofg at the place of observation
is used only when the Earth is one of the two masses
is greatest at the surface of the Earth
is universal constant of nature
Law of gravitation gives the gravitational force between
the Earth and a point mass only
the Earth and Sun only
any two bodies having some mass
two charged bodies only
The weight of an object at the centre of the Earth of radius R is (NCERT Exemplar)
zero
infinite
R times the weight at the surface of the Earth
1/R2 times the weight at surface of the Earth
An object weighs 10 N in air. When immersed fully in water, it weighs only 8 N. The weight of the liquid displaced by the object will be
2 N
8 N
10 N
12 N
A girl stands on a box having 60 cm length, 40 cm breadth and 20 cm width in three ways. In which of the following cases, pressure exerted by the box will be
maximum when length and breadth form the base
maximum when breadth and width form the base
maximum when width and length form the base
the same in all the above three cases
When a mango falls from a mango tree then
only the Earth attracts the mango.
only the mango attracts the Earth.
both the mango and the Earth attract each other.
both the mango and the Earth repel each other.
When a ship floats in sea water
The weight of water displaced is greater than the weight of ship
The weight of water displaced is less than the weight of the ship
The weight of water displaced is equal to the weight of the ship
It displaces no water.
If the gravitational attraction of the Earth suddenly disappears, which of the following statements will be true?
The weight of body will become zero but the mass will remain same.
The weight of a body will remain same but the mass will become zero.
Both mass and weight become zero.
Neither mass nor weight becomes zero.
wo particles are placed at some distance. If the mass of each of the two particles is doubled, keeping the distance between them unchanged, the value of gravitational force between them will be:
1/4 times
4 times
1/2 times
Unchanged
