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question_answer1)
The tidal waves in the sea are primarily due to
A)
The gravitational effect of the moon on the earth done
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B)
The gravitational effect of the sun on the earth done
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C)
The gravitational effect of venus on the earth done
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D)
The atmospheric effect of the earth itself done
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question_answer2)
If there were a smaller gravitational effect, which of the following forces do you think would alter in some respect [NCERT 1978]
A)
Viscous forces done
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B)
As it depends on the weight of the body. done
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C)
Electrostatic force done
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D)
None of the above done
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question_answer3)
A satellite of the earth is revolving in a circular orbit with a uniform speed v. If the gravitational force suddenly disappears, the satellite will [AIIMS 1982; AIEEE 2002]
A)
Continue to move with velocity v along the original orbit done
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B)
Move with a velocity v, tangentially to the original orbit done
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C)
Fall down with increasing velocity done
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D)
Ultimately come to rest somewhere on the original orbit done
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question_answer4)
The atmosphere is held to the earth by [IIT 1986]
A)
Winds done
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B)
Gravity done
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C)
Clouds done
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D)
None of the above done
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question_answer5)
The weight of a body at the centre of the earth is [AFMC 1988]
A)
Zero done
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B)
Infinite done
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C)
Same as on the surface of earth done
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D)
None of the above done
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question_answer6)
If the distance between two masses is doubled, the gravitational attraction between them [CPMT 1973; AMU (Med.) 2000]
A)
Is doubled done
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B)
Becomes four times done
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C)
Is reduced to half done
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D)
Is reduced to a quarter done
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question_answer7)
Which of the following is the evidence to show that there must be a force acting on earth and directed towards the sun [AIIMS 1980]
A)
Deviation of the falling bodies towards east done
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B)
Revolution of the earth round the sun done
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C)
Phenomenon of day and night done
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D)
Apparent motion of sun round the earth done
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question_answer8)
The gravitational force between two stones of mass 1 kg each separated by a distance of 1 metre in vacuum is [DPMT 1984]
A)
Zero done
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B)
\[6.675\times {{10}^{-5}}\,newton\] done
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C)
\[6.675\times {{10}^{-11}}\,newton\] done
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D)
\[6.675\times {{10}^{-8}}\,newton\] done
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question_answer9)
Two particles of equal mass go round a circle of radius R under the action of their mutual gravitational attraction. The speed of each particle is [CBSE PMT 1995; RPMT 2003]
A)
\[v=\frac{1}{2R}\sqrt{\frac{1}{Gm}}\] done
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B)
\[v=\sqrt{\frac{Gm}{2R}}\] done
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C)
\[v=\frac{1}{2}\sqrt{\frac{Gm}{R}}\] done
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D)
\[v=\sqrt{\frac{4Gm}{R}}\] done
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question_answer10)
The earth (mass \[=6\times {{10}^{24}}\,kg)\]) revolves round the sun with angular velocity \[2\times {{10}^{-7}}\,rad/s\] in a circular orbit of radius \[1.5\times {{10}^{8}}\,km\]. The force exerted by the sun on the earth in newtons, is [CBSE PMT 1995; AFMC 1999; Pb. PMT 2003]
A)
\[18\times {{10}^{25}}\] done
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B)
Zero done
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C)
\[27\times {{10}^{39}}\] done
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D)
\[36\times {{10}^{21}}\] done
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question_answer11)
Gravitational mass is proportional to gravitational [AIIMS 1998]
A)
Field done
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B)
Force done
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C)
Intensity done
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D)
All of these done
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question_answer12)
The gravitational force between two point masses \[{{m}_{1}}\] and \[{{m}_{2}}\] at separation r is given by \[F=k\frac{{{m}_{1}}{{m}_{2}}}{{{r}^{2}}}\] The constant k [CPMT 1993]
A)
Depends on system of units only done
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B)
Depends on medium between masses only done
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C)
Depends on both (a) and (b) done
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D)
Is independent of both (a) and (b) done
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question_answer13)
The distance of the centres of moon and earth is D. The mass of earth is 81 times the mass of the moon. At what distance from the centre of the earth, the gravitational force will be zero [RPET 1996]
A)
\[\frac{D}{2}\] done
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B)
\[\frac{2D}{3}\] done
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C)
\[\frac{4D}{3}\] done
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D)
\[\frac{9D}{10}\] done
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question_answer14)
Who among the following gave first the experimental value of G [AFMC 1997]
A)
Cavendish done
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B)
Copernicus done
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C)
Brook Teylor done
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D)
None of these done
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question_answer15)
The mass of the moon is \[7.34\times {{10}^{22}}\,kg\] and the radius is \[1.74\times {{10}^{6}}\,m\]. The value of gravitation force will be [AMU 1999]
A)
1.45 N/kg done
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B)
1.55 N/kg done
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C)
1.75 N/kg done
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D)
1.62 N/kg done
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question_answer16)
The centripetal force acting on a satellite orbiting round the earth and the gravitational force of earth acting on the satellite both equal F. The net force on the satellite is [AMU 1999]
A)
Zero done
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B)
F done
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C)
\[F\sqrt{2}\] done
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D)
2 F done
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question_answer17)
Reason of weightlessness in a satellite is [RPMT 2000]
A)
Zero gravity done
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B)
Centre of mass done
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C)
Zero reaction force by satellite surface done
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D)
None done
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question_answer18)
Mass M is divided into two parts xM and \[(1-x)\,M\]. For a given separation, the value of x for which the gravitational attraction between the two pieces becomes maximum is [EAMCET 2001]
A)
\[\frac{1}{2}\] done
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B)
\[\frac{3}{5}\] done
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C)
1 done
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D)
2 done
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question_answer19)
The force of gravitation is [AIIMS 2002]
A)
Repulsive done
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B)
Electrostatic done
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C)
Conservative done
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D)
Non-conservative done
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question_answer20)
The gravitational force \[{{F}_{g}}\] between two objects does not depend on [RPET 2003]
A)
Sum of the masses done
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B)
Product of the masses done
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C)
Gravitational constant done
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D)
Distance between the masses done
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question_answer21)
Two sphere of mass m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be [CBSE PMT 2003]
A)
F done
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B)
\[\frac{F}{3}\] done
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C)
\[\frac{F}{9}\] done
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D)
3 F done
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question_answer22)
Earth binds the atmosphere because of [J&K CET 2005]
A)
Gravity done
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B)
Oxygen between earth and atmosphere done
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C)
Both (a) and (b) done
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D)
None of these done
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question_answer23)
Which of the following statements about the gravitational constant is true [Kerala PET 2005]
A)
It is a force done
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B)
It has no unit done
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C)
It has same value in all systems of units done
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D)
It depends on the value of the masses done
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E)
It does not depend on the nature of the medium in which the bodies are kept. done
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question_answer24)
Two identical solid copper spheres of radius R placed in contact with each other. The gravitational attracton between them is proportional to [Kerala PET 2005]
A)
\[{{R}^{2}}\] done
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B)
\[{{R}^{-2}}\] done
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C)
\[{{R}^{4}}\] done
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D)
\[{{R}^{-4}}\] done
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