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WorksheetsPhysics 9 Gravitation
Total questions: 24
Worksheet time: 8mins
Name
Class
Date
1.
An object is thrown vertically upwards with a velocity u, the greatest height h to which it will rise before falling back is given by
a)
u * u / 2g
b)
u * u / g
c)
u / g
d)
u / 2g
2.
The mass of moon is about 0.012 times that of earth and its diameter is about 0.25 times that of earth. The value of G on the moon will be :
a)
same as that on the earth
b)
less than that on the earth
c)
more than that on the earth
d)
about one-sixth of that on the earth
3.
The value of g on the surface of the moon:
a)
is less than that on the earth
b)
keeps changing day by day
c)
is the same as on the earth
d)
is more than that on the earth
4.
The atmosphere consisting of a large number of gases is held to the earth by :
a)
gravity
b)
earth's magnetic field
c)
winds
d)
clouds
5.
The force of attraction between two unit point masses separated by a unit distance is called:
a)
universal gravitational constant
b)
gravitational potential
c)
acceleration due to gravity
d)
gravitational field strength
6.
The weight of an object at the centre of the earth of radius R is:
a)
zero
b)
R times the weight at the surface of the earth
c)
infinite
d)
1/ (R * R) times the weight at the surface of the earth
7.
Two objects of different masses falling freely near the surface of moon would:
a)
have same velocities at any instant
b)
have different accelerations
c)
experience forces of same magnitude
d)
undergo a change in their inertia
8.
The value of acceleration due to gravity of earth :
a)
is the least on equator
b)
is the same on equator and poles
c)
is the least on poles
d)
increases from pole to equator
9.
The law of gravitation gives the gravitational force between :
a)
any two bodies having some mass
b)
the earth and a point mass only
c)
the earth and the sun only
d)
any two charged bodies only
10.
The value of quantity G in the formula for gravitational force:
a)
depends neither on mass nor on radius of earth
b)
depends on mass of the earth only
c)
depends on the radius of earth only
d)
depends on both mass and radius of earth
11.
Two particles are placed at some distance from each other. If, keeping the distance between them unchanged, the mass of each of the two particles is doubled, the value of gravitational force between them will become:
a)
4 times
b)
2 times
c)
1/2 times
d)
1/4 times
12.
In the relation F = G × M × m / d x d, the quantity G:
a)
is the greatest on the surface of the earth
b)
depends on the value of g at the place of observation
c)
is used only when the earth is one of the two masses
d)
is of the same value irrespective of the place of observation
13.
The gravitational force of attraction between two objects is x. Keeping the masses of the objects unchanged, if the distance between the objects is halved, then the magnitude of gravitational force between them will become
a)
4x
b)
2x
c)
x/2
d)
x/4
14.
An apple of mass 100 g falls from a tree because of gravitational attraction between the earth and the apple. If the magnitude of force exerted by the earth on the apple be F1 and the magnitude of force exerted by the apple on the earth be F2, then
a)
Fi and F2 are exactly equal
b)
F1 is very much greater than F2
c)
F1 is only a little greater than F2
d)
F2 is very much greater than F1
15.
An object weighs 10 N in air. When immersed fully in a liquid, it weighs only 8 N. The weight of liquid displaced by the object will be:
a)
2 N
b)
8 N
c)
10 N
d)
12 N
16.
A rectangular wooden block has length, breadth and height of 50 cm, 25 cm and 10 cm, respectively.
This wooden block is kept on ground in three different ways, turn by turn. Which of the following is the correct statement about the pressure exerted by this block on the ground ?
a)
the maximum pressure is exerted when breadth and height form the base
b)
the maximum pressure is exerted when the length and breadth form the base
c)
the maximum pressure is exerted when length and height form the base
d)
the minimum pressure is exerted when length and height form the base
17.
An object is put in three liquids having different densities, one by one. The object floats with 1/9, 2/11 and 3/7 parts of its volume outside the surface of liquids of densities d1, d2 and d3 respectively. Which of the following is the correct order of the densities of the three liquids?
a)
d1 < d2 < d3
b)
d1 > d2 > d3
c)
d2 > d3 > d1
d)
d3 > d2 > d1
18.
A metal in which even iron can float is :
a)
mercury
b)
sodium
c)
magnesium
d)
manganese
19.
Four balls, A, B, C and D displace 10 mL, 24 mL, 15 mL and 12 mL of a liquid respectively, when immersed completely. The ball which will undergo the maximum apparent loss in weight will be
a)
B
b)
A
c)
C
d)
D
20.
The relative densities of four liquids P, Q, R and S are 1.26, 1.0, 0.84 and 13.6 respectively. An object is floated in all these liquids, one by one.
In which liquid the object will float with its maximum volume submerged under the liquid?
a)
R
b)
P
c)
Q
d)
S
21.
A solid of density 900 kg/m3 floats in oil as shown in the given diagram. The oil floats on water of density 1000 kg/m3 as shown.
The density of oil in kg/m3 could be:
a)
950
b)
900
c)
850
d)
1050
22.
The density of water is 1000 kg/m3 and the density of copper is 8900 kg/m3. Which of the following statements is incorrect?
a)
The volume of a certain mass of copper / The volume of the same mass of water = 8.9
b)
The density of a certain volume of copper / The density of the same volume of water = 8/9
c)
The weight of a certain volume of copper / The weight of the same volume of water = 8.9
d)
The mass of a certain volume of copper / The mass of the same volume of water = 8.9
23.
The diagrams represent four measuring cylinders containing liquids. The mass and volume of the liquid
in each cylinder are stated. Which two measuring cylinders could contain an identical liquid?
a)
X and Z
b)
W and X
c)
W and Y
d)
X and Y
24.
Consider the following information in respect of four objects A, B, C and D. Which object would float on water?
a)
D
b)
A
c)
B
d)
C
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