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Physics NEET MCQ
Mcq On Gravitation
Quiz 1
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Q.1
Which is of the following statement is true Statement A: Gravitational constant G value does not depend on the medium between the bodies Statement B: Gravitational constant G depends on the masses of the bodies and the sizes of the bodies
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A & B both are correct
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only A is correct
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Only B is correct
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A and B both are wrong
Q.2
If the distance between the earth and sun were half its present value, the number of days in a year would be
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64.5
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129
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182.5
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730
Q.3
if both the mass of earth and its radius are decreased by 1%,the value of acceleration of gravity will
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Decrease by 1%
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Increase by 1%
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Increase by 2%
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remain unchanged
Q.4
A body weigh W newton of the surface of the earth. Its weight at a height equal to half the radius of the earth will be
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W/2
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2W/3
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4W/9
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W/4
Q.5
when a stone of mass m is falling in the earth of mass M, the acceleration of the earth will be
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zero
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mg/M
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Mg/m
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g
Q.6
The weight of the object will be ( More than one correct answer)
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zero at the center of the earth
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same in all the satellites
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same at all the points on the surface of the earthcorrect
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none of the above
Q.7
Which is of the following statement is true Statement A: it is possible to put an artificial satellite in an orbit such a way that it will remain always directly over New Delhi Statement B: An earth satellite continues to move in the orbit due to centripetal force provided by the burning of the fuel of its engine
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A & B both are correct
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only A is correct
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Only B is correct
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A and B both are wrong
Q.8
A mass m is divided into two part ym and (1-y)m .For a given separation, the value of y for which the gravitational attraction between the two pieces becomes maximum
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1/2
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3/5
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1
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2
Q.9
Two bodies of mass M and 2M are at rest at infinite separation. They move towards each other under the mutual gravitational attraction. Then at separation r ,which of the following is false
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The total energy of the system is not zero
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The force between them is zero
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The center of the mass of the system is moving
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none of the above
Q.10
The change in the graviational potential energy when a body of mass m is raised to a height nR above the surface of the earth is (here R is the radius of the earth)
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$(\frac {n}{n+1}) mgR$
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$(\frac {n}{n-1}) mgR$
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nmgR
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$\frac {mgR}{n}$
Q.11
Two planets of radii $R_1$ and $R_2$ are made from the same material . The ratio of the accelerations due to gravity $g_1 /g_2$ at the surfaces of the planets is
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$\frac {R_1}{R_2}$
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$\frac {R_2}{R_1}$
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$(\frac {R_1}{R_2})^2$
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$(\frac {R_2}{R_1})^2$
Q.12
Assertion: Angular speed of a planet around the sun increases, when it is closer to the sun. Reason: Total angular momentum of the system remains constant. Choose the correct one
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Both assertion and reason are true and reason is the correct explanation of the assertion
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Both assertion and reason are true but reason is not correct explanation of the assertion
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Assertion is true, but reason is false
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Both assertion and reason are false
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Reason is true but assertion is false.
Q.13
Assertion: Total energy is conserved moving a satellite to higher orbit. Reason: Sum of change in PE and KE is same in magnitude and opposite in nature. Choose the correct one
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Both assertion and reason are true and reason is the correct explanation of the assertion
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Both assertion and reason are true but reason is not correct explanation of the assertion
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Assertion is true, but reason is false.
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Both assertion and reason are false.
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Reason is true but assertion is false
Q.14
What would be the acceleration due to gravity at another planet, whose mass and radius are twice that of the earth?
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g/4
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g/2
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g
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g/3
Q.15
The radii of circular orbits of two satellites A and B of the earth, are 4R and R, respectively. If the speed of satellite A is 3V, then the speed of satellite B will be
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3V/4
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6V
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12V
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3V/2
Q.16
If we move from equator to pole, the value of acceleration due to gravity
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first increases then decreases
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remains same
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decreases
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increases
Q.17
For a satellite moving in an orbit around the earth, the ratio of potential energy to kinetic energy is
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1/2
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2
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$\sqrt 2$
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$1/\sqrt 2$
Q.18
An artificial satellite moving in a circular orbit around the earth has a total (kinetic + potential) Energy $E_0$. Its potential energy is
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$E_0$
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$2E_0$
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$-E_0$
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$1.5E_0$
Q.19
The distance of a geostationary satellite from the centre of earth (radius R = 6400 km) is nearest to
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18R
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7R
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10R
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4R
Q.20
Assertion: The earth without its atmosphere would be inhospitably cold. Reason: All heat would escape in the absence of atmosphere. Choose the correct one
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Both assertion and reason are true and reason is the correct explanation of the assertion.
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Both assertion and reason are true but reason is not correct explanation of the assertion
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Assertion is true, but reason is false.
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Both assertion and reason are false
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Reason is true but assertion is false.
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