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question_answer1)
Calculate the force of gravitation due to earth on a man weighing 100 kg standing on the ground? (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth\[=\,6.4\times {{10}^{3}}km\])
A)
977 N done
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B)
1000 N done
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C)
1230 N done
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D)
1524 N done
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E)
None of these done
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question_answer2)
Who discovered gravitational force?
A)
Sir Isacc Newton done
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B)
Robert Hook done
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C)
Robert Brown done
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D)
James Chadwick done
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E)
None of these done
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question_answer3)
What do we called the upward force acting on an object immersed in the liquid?
A)
Mechanical force done
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B)
Electrical force done
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C)
Buoyant force done
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D)
Gravitational force done
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E)
None of these done
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question_answer4)
The weight of on object on the earth is 60 N. What will be its weight on the moon?
A)
10 N done
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B)
6 N done
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C)
1.6 N done
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D)
1.2 N done
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E)
None of these done
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question_answer5)
There are four objects of equal mass at a distance of 4m, 8m 6m and 10m from a pole. Which object will have maximum force of attraction with the pole?
A)
The object which is 4 m away from the pole done
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B)
The object which is 8 m away from the pole done
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C)
The object which is 6 m away from the pole done
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D)
The object which is 10 m away from the pole done
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E)
None of these done
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question_answer6)
What is the value of acceleration due to gravity on the earth?
A)
\[9.8\,m/{{s}^{2}}\] done
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B)
\[6.8\,m/{{s}^{2}}\] done
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C)
\[5.8\,m/{{s}^{2}}\] done
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D)
\[4.9\,m/{{s}^{2}}\] done
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E)
None of these done
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question_answer7)
What is the value of universal gravitational constant?
A)
\[5.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] done
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B)
\[6.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] done
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C)
\[4.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] done
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D)
\[3.67\times {{10}^{-11}}N\,{{m}^{2}}k{{g}^{2}}\] done
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E)
None of these done
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question_answer8)
Which of the following will require least force to penetrate the piece of wood?
A)
Sharp iron nail done
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B)
Blunt Iron rod done
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C)
Thin sheet of steel done
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D)
A Hammer done
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E)
None of these done
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question_answer9)
In vacuum, all freely falling objects have:
A)
Same acceleration done
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B)
Same speed done
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C)
Same momentum done
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D)
same force done
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E)
None of these done
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question_answer10)
Which one of the following formula is correct for pressure?
A)
\[p\frac{F}{A}\] done
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B)
\[P=FA\] done
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C)
\[P=F+A~~~~~~~~\] done
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D)
\[P=F-A\] done
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E)
None of these done
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question_answer11)
The value of universal Gravitational constant was first determined by:
A)
Gregor Mendel done
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B)
Ernst Haeckel done
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C)
Henry Cavendish done
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D)
Isaac newton done
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E)
None of these done
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question_answer12)
The gravitational force between a man weighing 68 kg and a woman weighing 52 kg standing 4 metres apart.
A)
\[1.2\,\times \,{{10}^{-11}}N\] done
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B)
\[1.48\,\times \,{{10}^{-9}}N\] done
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C)
\[1.48\,\times \,{{10}^{-8}}N\] done
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D)
\[150\,\times \,{{10}^{-11}}N\] done
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E)
None of these done
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question_answer13)
A particle is released from rest from a height. Find the distance it falls through in 5 second.
A)
102.5 m done
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B)
122.5 m done
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C)
108.5 m done
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D)
109.5 m done
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E)
None of these done
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question_answer14)
Acceleration due to gravity is ____ when an object is thrown vertically upwards.
A)
Zero done
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B)
Positive done
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C)
Negative done
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D)
Either [a] or [b] done
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E)
None of these done
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question_answer15)
Unit of universal gravitational constant is:
A)
\[N\,{{m}^{2}}\,k{{g}^{2}}\] done
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B)
\[N\,{{m}^{2}}\,/k{{g}^{2}}\] done
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C)
\[N\text{ }m\text{ }k{{g}^{2}}\] done
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D)
\[N\text{/}{{m}^{2}}\text{ }k{{g}^{2}}\] done
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E)
None of these done
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question_answer16)
Law of gravitation gives the gravitational force between:
A)
The earth and a point mass only. done
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B)
The earth and sun only. done
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C)
Any two bodies having some mass. done
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D)
Two charged bodies only. done
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E)
None of these done
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question_answer17)
The force with which the earth attracts an object is called ____ of the object.
A)
Mass done
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B)
Weight done
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C)
Acceleration done
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D)
Distance done
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E)
None of these done
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question_answer18)
Find the weight of a person whose mass is 72 kg.
A)
705.6 N done
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B)
700 N done
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C)
800 N done
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D)
70 N done
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E)
None of these done
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question_answer19)
A stone is dropped from a point at 3 : 30 : 32 p.m (hour : minute : second). Another stone is dropped from the same point at 3 : 30 : 34 p.m. Find the separation between the stones at 3 : 30 : 35 p.m.
A)
50 m done
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B)
39.2 m done
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C)
100 m done
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D)
48 m done
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E)
None of these done
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question_answer20)
In whose honour the S.I unit of pressure is named?
A)
Isaac newton done
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B)
Blaise pascal done
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C)
Archimedes done
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D)
Kepler done
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E)
None of these done
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question_answer21)
Which one of the following principles tells us that buoyant force acting on an object is equal to weight of the fluid displaced by that object?
A)
Kepler?s principle done
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B)
Archinedes? principle done
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C)
Newton's law done
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D)
Pascal's law done
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E)
None of these done
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question_answer22)
The acceleration due to gravity on the surface of a planet whose mass is same as that of the earth and radius is half of that of the earth is: (mass of earth \[=\,6\times {{10}^{24}}kg,\] Radius of earth \[=\,6.4\,\times \,{{10}^{3}}\,km)\]
A)
\[35.08\,m/{{s}^{2}}\] done
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B)
\[39.08\,m/{{s}^{2}}\] done
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C)
\[28.08\,m/{{s}^{2}}\] done
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D)
\[9.08\,m/{{s}^{2}}\] done
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E)
None of these done
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question_answer23)
Match the following:
Column A | Column B |
(i) Gravity | [A] Forces involved are very small. |
(ii) Gravitation | [B] Matter contained in a body. |
(iii) Weight | [C] S. I involved are large. |
(iv) Mass | [D] Forces involved are large. |
A)
(i - A), (ii - D), (iii - B), (iv - C) done
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B)
(i - D), (ii - A), (iii - B), (iv - C) done
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C)
(i - D), (ii - A), (iii - C), (iv - B) done
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D)
(i - A), (ii - C), (iii - D), (iv - B) done
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E)
None of these done
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question_answer24)
When the distance between two objects is increased, the force of attraction between them will:
A)
Decrease done
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B)
Increase done
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C)
Either [a] or [b] done
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D)
Do not change done
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E)
None of these done
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question_answer25)
Three balls P, Q and R are kept in a straight line. The separation between P and R is 1m, and Q is placed at the midpoint between them. The masses of P, Q, R are 200 g, 300 g and 400 g respectively. Find the net gravitational force on P, Q and R respectively.
A)
\[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N\] done
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B)
\[4.80\times {{10}^{-11}}N,\,3.73\times {{10}^{-11}}N,\,8.28\times {{10}^{-13}}N\] done
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C)
\[5.20\times {{10}^{-12}}N,\,7.63\times {{10}^{-11}}N,\,6.23\times {{10}^{-11}}N\] done
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D)
\[2.13\times {{10}^{-11}}N,\,4.80\times {{10}^{-11}}N,\,6.52\times {{10}^{-12}}N\] done
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E)
None of these done
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question_answer26)
Few characteristics of a quantity are given below. Find out the name of the quantity.
(i) It is zero at the centre of the earth. |
(ii) It is measures with a spring balance. |
(iii) It is a vector quantity. |
(iv) It's direction is towards the centre of the earth. |
A)
Pressure done
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B)
Weight done
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C)
Mass done
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D)
Kilogram done
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E)
None of these done
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question_answer27)
____ is the measures of inertia of a body.
A)
Weight done
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B)
Mass done
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C)
Inertia done
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D)
Time done
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E)
None of these done
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question_answer28)
Which one of the following is correct?
A)
Universal gravitational constant [G] is a vector quantity. done
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B)
The value of G varies from place to place. done
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C)
The value of G does not depend upon the nature of the medium between the two bodies. done
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D)
The value of G depends on the masses of the bodies. done
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E)
None of these done
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question_answer29)
A man drops a pencil from a height 2 m. With what speed does it strike the ground?
A)
63 m/s done
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B)
6.5 m/s done
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C)
6.26 m/s done
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D)
6.9 m/s done
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E)
None of these done
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question_answer30)
If masses of two bodies are halved and the distance between them is doubled, what effect do they have on the gravitational force between the masses?
A)
1/16 F done
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B)
1/8 F done
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C)
2 F done
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D)
F done
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E)
None of these done
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question_answer31)
As we go below the surface of the earth, the acceleration due to gravity ____.
A)
Goes on decreasing done
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B)
Goes on increasing done
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C)
Remains constant done
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D)
Either [a] or [b] done
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E)
None of these done
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question_answer32)
The final velocity of a body moving against gravity when it attains the maximum height is:
A)
h/t done
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B)
h done
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C)
2 gh done
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D)
Zero done
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E)
None of these done
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question_answer33)
A ball is dropped from the top of a building which takes 10 s to reach the ground. What is the height of the building?
A)
420 m done
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B)
400 m done
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C)
78.4 m done
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D)
490 m done
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E)
None of these done
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question_answer34)
S.I. unit of weight is:
A)
Kilogram done
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B)
Newton done
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C)
\[M/{{s}^{2}}\] done
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D)
\[M/s\] done
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E)
None of these done
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question_answer35)
The force of gravitation between two bodies in the universe does not depend on:
A)
The product of their masses done
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B)
The gravitational constant done
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C)
The distance between them done
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D)
The sum of their densities done
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E)
None of these done
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question_answer36)
Two protons kept at a separation of 1 fem to meter\[(1fm\,\,={{10}^{-15}}m)\]. The gravitational force between two protons is: (mass of proton\[=1.7\times {{10}^{-27}}kg\])
A)
\[1.6\times {{10}^{-36}}\,N\] done
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B)
\[1.86\times {{10}^{-34}}N\] done
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C)
\[1.19\times {{10}^{-35}}N\] done
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D)
\[1.62\times {{10}^{-35}}N\] done
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E)
None of these done
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question_answer37)
The weight of an object of mass 10 kg at the centre of the earth is ____.
A)
98 kg done
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B)
Zero done
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C)
140 N done
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D)
98 N done
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E)
None of these done
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question_answer38)
The force per unit area is called:
A)
Pascal done
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B)
Pressure done
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C)
Buoyant force done
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D)
Weight done
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E)
None of these done
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question_answer39)
Find the mass of an object whose weight on earth is 98 N.
A)
98 kg done
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B)
10 kg done
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C)
120 kg done
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D)
110 kg done
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E)
None of these done
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question_answer40)
The atmosphere is held to the earth by.
A)
Magnetic field of earth done
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B)
Clouds done
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C)
Wind done
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D)
Gravity done
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E)
None of these done
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