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question_answer1)
If a rock is brought from the surface of the moon,
A)
Its mass will change done
clear
B)
Its weight will change but not mass done
clear
C)
Both mass and weight will change done
clear
D)
Its mass and weight both will remain same done
clear
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question_answer2)
A body is weighed at the poles and then at the equator The weight
A)
at the equator will be greater than at the poles done
clear
B)
at the poles will be greater than at the equator done
clear
C)
at the poles will be equal to the weight at the equator done
clear
D)
depends upon the object done
clear
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question_answer3)
Consider a satellite going round the earth in a circular orbit. Which of the following statements is wrong?
A)
It is a freely falling body. done
clear
B)
It is moving with constant speed. done
clear
C)
It is acted upon by a force directed away from the centre of the earth which counter balances the gravitational pull done
clear
D)
Its angular momentum remains constant done
clear
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question_answer4)
A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
A)
positive done
clear
B)
negative done
clear
C)
zero done
clear
D)
may be positive or negative depending upon its initial velocity done
clear
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question_answer5)
\[SI\] unit of g is-
A)
\[{{m}^{2}}/s\] done
clear
B)
\[\text{m}/{{\text{s}}^{\text{2}}}\] done
clear
C)
\[\text{s}/{{\text{m}}^{\text{2}}}\] done
clear
D)
\[\text{m}/\text{s}\] done
clear
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question_answer6)
\[SI\]unit of G is
A)
\[{{N}^{2}}-{{m}^{2}}/kg\] done
clear
B)
\[N-{{m}^{2}}/kg\] done
clear
C)
\[N-m/kg\] done
clear
D)
\[N-{{m}^{2}}/k{{g}^{2}}\] done
clear
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question_answer7)
Choose the correct statement of the following:
A)
All bodies repel each other in this universe. done
clear
B)
Our earth does not behave like a magnet. done
clear
C)
Acceleration due to gravity is\[\text{8}.\text{9 m}/{{\text{s}}^{\text{2}}}\]. done
clear
D)
All bodies fall at the same rate in vacuum. done
clear
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question_answer8)
Maximum weight of a body is
A)
at the centre of the earth done
clear
B)
inside the earth done
clear
C)
on the surface of the earth done
clear
D)
above the surface of earth done
clear
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question_answer9)
If the distance between two masses be doubled, then the force between them will become
A)
\[\frac{1}{4}\]times done
clear
B)
4 times? done
clear
C)
\[\frac{1}{2}\]times done
clear
D)
2 times done
clear
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question_answer10)
A body falls freely towards the earth with
A)
uniform speed done
clear
B)
uniform velocity done
clear
C)
uniform acceleration done
clear
D)
none of these done
clear
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question_answer11)
If the mass of a body is M on the surface of the earth, then its mass on the surface of the moon will be
A)
\[\frac{M}{6}\] done
clear
B)
\[M\] done
clear
C)
\[M+6\] done
clear
D)
zero done
clear
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question_answer12)
Weight
A)
is a vector quantity done
clear
B)
of a body in interplanetary space is maximum done
clear
C)
increases when the bodies go up done
clear
D)
none of these done
clear
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question_answer13)
The value of g near the earth's surface is
A)
\[\text{8}.\text{9 m}/{{\text{s}}^{\text{2}}}\] done
clear
B)
\[\text{8}.\text{9 m}/\text{s}\] done
clear
C)
\[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] done
clear
D)
\[\text{9}.\text{8 m}/\text{s}\] done
clear
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question_answer14)
A geostationary satellite
A)
moves faster than the near earth satellite done
clear
B)
has a time period less that of a near earth satellite done
clear
C)
revolves about the polar axis done
clear
D)
is stationary in space done
clear
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question_answer15)
The force of gravitation between two bodies depend upon
A)
their separation done
clear
B)
gravitational constant done
clear
C)
product of their masses done
clear
D)
all of these done
clear
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question_answer16)
When an object is thrown up, the force of gravity
A)
acts in the direction of the motion done
clear
B)
acts in the opposite direction of the motion done
clear
C)
remains constant as the body moves up done
clear
D)
increases as the body moves up done
clear
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question_answer17)
The force of gravitation exists
A)
every where in the universe done
clear
B)
at the surface of the earth only done
clear
C)
inside the earth only done
clear
D)
at the surface of the moon only done
clear
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question_answer18)
1 kg wt is equal to
A)
9.8 N done
clear
B)
980 N done
clear
C)
98 N done
clear
D)
none of these done
clear
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question_answer19)
1 kg wt is equal to
A)
980 dynes done
clear
B)
9.80 dynes done
clear
C)
98 dynes done
clear
D)
none of these done
clear
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question_answer20)
The value of G does not depend on
A)
nature of the interacting bodies done
clear
B)
size of the interacting bodies done
clear
C)
mass of the interacting bodies done
clear
D)
all of these done
clear
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question_answer21)
The ratio of SI units to CGS units of G is
A)
\[\text{1}{{0}^{\text{3}}}\] done
clear
B)
\[\text{1}{{0}^{\text{2}}}\] done
clear
C)
\[\text{1}{{0}^{-\text{2}}}\] done
clear
D)
\[\text{1}{{0}^{-\text{3}}}\] done
clear
View Solution play_arrow
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question_answer22)
The ratio of SI units to CGS units of g is
A)
\[\text{1}{{0}^{\text{2}}}\] done
clear
B)
10 done
clear
C)
\[\text{1}{{0}^{-\text{1}}}\] done
clear
D)
\[\text{1}{{0}^{-\text{2}}}\] done
clear
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question_answer23)
SI unit of G is \[\text{N}{{\text{m}}^{\text{2}}}\]\[\text{k}{{\text{g}}^{-\text{2}}}\]. Which of the following can also be used as the SI unit of G?
A)
\[{{m}^{3}}k{{g}^{-1}}{{s}^{-2}}\] done
clear
B)
\[{{m}^{3}}k{{g}^{-2}}{{s}^{-1}}\] done
clear
C)
\[\text{m k}{{\text{g}}^{-\text{3}}}\text{ }{{\text{s}}^{-\text{1}}}\] done
clear
D)
\[{{\text{m}}^{\text{2}}}\text{ k}{{\text{g}}^{-\text{3}}}\text{ }{{\text{s}}^{-\text{2}}}\] done
clear
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question_answer24)
The mass of the Jupiter is \[\text{1}\text{.9 }\times \text{ 1}0\text{27}\]kg and that of the sun is \[\text{1}\text{.99 }\times \text{ 1}0\text{38}\] kg. The mean distance of the Jupiter from the sun is \[\text{7}\text{.8 }\times \text{ 1}0\text{11}\] m. Speed of the Jupiter is (assuming that Jupiter moves in a circular orbit around the sun)
A)
\[\text{1}\text{.3}0\text{4 }\times \text{ 1}{{0}^{\text{4}}}\text{m}/\text{sec}\] done
clear
B)
\[\text{13}.0\text{4 }\times \text{1}{{\text{0}}^{4}}\text{m}/\text{sec}\] done
clear
C)
\[\text{1}\text{.3}0\text{4 }\times \text{1}{{\text{0}}^{\text{6}}}\text{m}/\text{sec}\] done
clear
D)
\[1.304\,\times {{10}^{2}}m/sec\] done
clear
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question_answer25)
The value of gravitational intensity of the centre of the earth is
A)
1 done
clear
B)
infinity done
clear
C)
zero done
clear
D)
none of these done
clear
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question_answer26)
Ratio of the radius of the earth to that of the moon is 10. Ratio of g on the earth to the moon is 6. Then ratio of the escape velocity from the earth's surface to that from the moon is approximately
A)
2 done
clear
B)
4 done
clear
C)
8 done
clear
D)
8 done
clear
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question_answer27)
The acceleration due to gravity
A)
has the same value everywhere in space done
clear
B)
has the same value everywhere on the earth done
clear
C)
varies with the latitude on the earth done
clear
D)
is greater on the moon due to its smaller diameter done
clear
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question_answer28)
\[SI\] unit of weight is
A)
kg wt done
clear
B)
N done
clear
C)
g wt done
clear
D)
none of these done
clear
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question_answer29)
Gravitational force which acts on 1 kg is
A)
9.8 N done
clear
B)
\[\frac{1}{9.8}N\] done
clear
C)
980N done
clear
D)
none of these done
clear
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question_answer30)
Weight is
A)
measured by a spring balance done
clear
B)
measured by a beam balance done
clear
C)
measured in kg done
clear
D)
a scalar quantity done
clear
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question_answer31)
A satellite which is geostationary in a particular orbit is taken to another orbit. Its distance from the centre of earth in new orbit is 2 times than that of the earlier orbit. The time period in the second orbit is
A)
4.8 hours done
clear
B)
\[48\sqrt{2}\] hours done
clear
C)
24 hours done
clear
D)
\[24\sqrt{2}\] hours done
clear
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question_answer32)
If a satellite is orbiting close to the surface of the earth, then its speed is
A)
\[\sqrt{2}Rg\] done
clear
B)
\[Rg\] done
clear
C)
\[\sqrt{\frac{Rg}{2}}\] done
clear
D)
\[\sqrt{Rg}\] done
clear
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question_answer33)
The weight of an object
A)
is the quantity of the matter it contains done
clear
B)
refers to its inertia done
clear
C)
is the same as its mass but is expressed in different unit done
clear
D)
is the force with which it is attracted towards the earth done
clear
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question_answer34)
Two metal spheres of equal radius r are touching each other. The force of attraction F between them is
A)
\[F\propto {{r}^{4}}\] done
clear
B)
\[F\propto {{r}^{6}}\] done
clear
C)
\[F\propto {{r}^{2}}\] done
clear
D)
\[F\propto \frac{1}{{{r}^{2}}}\] done
clear
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question_answer35)
A man weighs 60 kg at earth's surface. At what height above the earth's surface his weight becomes 30 kg? ( radius of earth = 6400 km).
A)
1624 km done
clear
B)
2424 km done
clear
C)
2624km done
clear
D)
2826km done
clear
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question_answer36)
The escape velocity from the earth's surface is 11 km/sec. A certain planet has a radius twice that of the earth but its mean density is the same as that of the earth. The value of the escape velocity from this planet would be
A)
11 km/sec done
clear
B)
22 km/sec done
clear
C)
33 km/sec done
clear
D)
16.5 km/sec done
clear
View Solution play_arrow
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question_answer37)
The gravitational pull exerted by the earth on a body is called its
A)
true weight done
clear
B)
mass done
clear
C)
gravitational mass done
clear
D)
inertial mass done
clear
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question_answer38)
A weighing machine measures
A)
weight only done
clear
B)
mass only done
clear
C)
mass and weight done
clear
D)
none of these done
clear
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question_answer39)
There are two bodies of masses 100 kg and 10000 kg separated by a distance 1m. At what distance from the smaller body, intensity of gravitational field will be zero?
A)
\[\frac{1}{9}m\] done
clear
B)
\[\frac{1}{10}m\] done
clear
C)
\[\frac{1}{11}m\] done
clear
D)
\[\frac{10}{11}m\] done
clear
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question_answer40)
At what height, is the value of g half that on the surface of earth? (R = radius of the earth)
A)
\[0.\text{414R}\] done
clear
B)
R done
clear
C)
2R done
clear
D)
3.5R done
clear
View Solution play_arrow
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question_answer41)
If R is the radius of the earth and g the acceleration due to gravity on the earth's surface, then mean density of the earth is
A)
\[\frac{4\pi G}{3gR}\] done
clear
B)
\[\frac{3\pi R}{4gG}\] done
clear
C)
\[\frac{3g}{4\pi RG}\] done
clear
D)
\[\frac{\pi g}{12RG}\] done
clear
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question_answer42)
The apparent weight of a body weighing M kg Wt during free fall is
A)
less than M kg wt done
clear
B)
more than M kg wt done
clear
C)
equal to M kg wt done
clear
D)
zero done
clear
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question_answer43)
A mass M is broken in two parts : m and (\[M-m\]) Relation between m and M so that the force of gravitation between the two parts is maximum is
A)
\[mM=2\] done
clear
B)
\[m=\frac{M}{2}\] done
clear
C)
\[M={{m}^{2}}\] done
clear
D)
none of these done
clear
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question_answer44)
An artificial satellite of mass 200 kg revolves around the earth in an orbit of average radius 667 km. Its total energy in the orbit is (Mass of the earth = \[6.0\times {{10}^{24}}kg\] and\[~\text{G }=\text{ 6}.\text{67 }\times \text{1}{{0}^{-\text{11}}}\text{ N}-{{m}^{2}}\text{/k}{{\text{g}}^{\text{2}}})\]
A)
\[\text{6}.\text{6 }\times \text{ 1}{{0}^{9}}\text{ joule}\] done
clear
B)
\[-\text{ 6}.\text{6 }\times \text{ 1}{{0}^{\text{9}}}\text{ joule}\] done
clear
C)
\[\text{6}.\text{6 }\times \text{ 1}{{0}^{-\text{9}}}\text{ joule}\] done
clear
D)
\[-\text{ 6}.\text{6 }\times \text{ 1}{{0}^{-\text{9}}}\text{ joule}\] done
clear
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question_answer45)
A particle of mass m revolves round a horizontal circle of radius r under the influence of a K centripetal force equal to \[-\frac{k}{2r}\] , where K stands for a constant. What is the total energy possesses by this particle?
A)
\[+\frac{k}{r}\] done
clear
B)
\[-\frac{k}{2r}\] done
clear
C)
\[-\frac{\text{ 2K}}{r}\] done
clear
D)
\[+\frac{\text{ K}}{{{r}^{2}}}\] done
clear
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question_answer46)
A spaceship is launched into a circular orbit close to earth's surface. What additional velocity ha now to be imparted to the spaceship in the orbit to overcome the gravitational pull? (Radius of earth = 6400 km and\[\text{g }=\text{ 9}\text{.8 m}/{{\text{s}}^{\text{2}}}\])
A)
2.83 km/s done
clear
B)
3.28 km/sec done
clear
C)
6.68 km/s done
clear
D)
8.32 km/sec done
clear
View Solution play_arrow
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question_answer47)
What will be the acceleration due to gravity on the surface of moon if its radius is \[\frac{1}{4}\]th the radius of the earth and its mass is \[\frac{1}{80}\] th the mass of earth?
A)
\[\frac{g}{2}\] done
clear
B)
\[\frac{g}{3}\] done
clear
C)
\[\frac{g}{7}\] done
clear
D)
\[\frac{g}{5}\] done
clear
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question_answer48)
A planet of mass m moves around the sun of mass M in an elliptical orbit. The maximum and minimum distances of the planet from the sun are \[{{r}_{1}}\] and \[{{r}_{2}}\]. respectively. The time period of the planet is proportional to
A)
\[{{r}_{1}}^{\frac{3}{2}}\] done
clear
B)
\[{{r}_{2}}^{\frac{3}{2}}\] done
clear
C)
\[\frac{{{({{r}_{1}}+{{r}_{2}})}^{\frac{3}{2}}}}{2}\] done
clear
D)
\[\frac{{{({{r}_{1}}-{{r}_{2}})}^{\frac{3}{2}}}}{2}\] done
clear
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question_answer49)
On a planet (whose size is the same and mass 4 times as that of the earth), the energy needed to lift a 2 kg mass vertically upwards through 2 m distance on the planet is \[(\text{g }=\text{ 1}0\text{ m}/{{\text{s}}^{\text{2}}}\]on the surface of the earth)
A)
16 joules done
clear
B)
160 joules done
clear
C)
32 joules done
clear
D)
320 joules done
clear
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question_answer50)
A satellite is revolving in a circular orbit at a distance of 2620 km from the surface of the earth. The time period of revolution of the satellite is (Radius of the earth = 6380 km, mass of the earth \[=6\times {{10}^{24}}kg,G=6.67\times {{10}^{-11}}N-{{m}^{2}}^{/}k{{g}^{2}})\]
A)
2.35 hours done
clear
B)
23.5 hours done
clear
C)
3.25 hours done
clear
D)
32.5 hours done
clear
View Solution play_arrow
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question_answer51)
The angular velocity of rotation of the earth in order to make the effective acceleration due to gravity equal to zero at equator should be
A)
\[\text{2}.\text{15 }\times \text{ 1}{{0}^{\text{3}}}\text{ rad}/\text{sec}\] done
clear
B)
\[\text{2}.\text{25 }\times \text{ 1}{{0}^{-\text{3}}}\text{ rad}/\text{sec}\] done
clear
C)
\[\text{1}.\text{25 }\times \text{ 1}{{0}^{\text{3}}}\text{ rad}/\text{sec}\] done
clear
D)
\[\text{1}.\text{25 }\times \text{ 1}{{0}^{-\text{3}}}\text{ rad}/\text{sec}\] done
clear
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question_answer52)
The gravitational intensity is denoted by
A)
\[g\] done
clear
B)
G done
clear
C)
\[E\] done
clear
D)
none of these done
clear
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question_answer53)
The variation of g with height or depth (r) is shown correctly by the graph in the figure (where R = radius of the earth),
A)
B)
C)
D)
View Solution play_arrow
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question_answer54)
Explorer 38, a radio-astronomy satellite of mass 200 kg circles the earth in an orbit of average 3R radius\[\frac{3R}{2}\] , where R is the radius of the earth. Assuming the gravitational pull on the mass of kg at the earth's surface to be 10 N, calculate the pull on the satellite.
A)
889N done
clear
B)
8.89 N done
clear
C)
8889N done
clear
D)
88.9 N done
clear
View Solution play_arrow
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question_answer55)
If gravitational mass of a body on the moon be denoted by \[{{M}_{m}}\] and that on the earth be \[{{M}_{e}}\], then
A)
\[{{M}_{m}}=\frac{1}{6}\] done
clear
B)
\[{{M}_{m}}={{M}_{e}}\] done
clear
C)
\[{{M}_{m}}=\sqrt{{{M}_{e}}}\] done
clear
D)
\[{{M}_{m}}=6{{M}_{e}}\] done
clear
View Solution play_arrow
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question_answer56)
Mass of the earth is 81 times the mass of the moon and distance between the earth and moon is 60 times the radius of the earth. If R is radius of the earth, then distance between the moon and the point on the line joining the moon and earth where the gravitational force becomes zero is
A)
30R done
clear
B)
15R done
clear
C)
6R done
clear
D)
5R done
clear
View Solution play_arrow
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question_answer57)
If density of the earth is doubled keeping its radius constant, then acceleration due to gravity (\[\text{present value 9}.\text{8m}{{\text{s}}^{-\text{2}}}\]) will be
A)
\[~\text{2}.\text{45m}{{\text{s}}^{-\text{2}}}\] done
clear
B)
\[\text{4}.\text{9m}{{\text{s}}^{-\text{2}}}\] done
clear
C)
\[\text{9}.\text{8m}{{\text{s}}^{-\text{2}}}\] done
clear
D)
\[\text{19}.\text{6m}{{\text{s}}^{-\text{2}}}\] done
clear
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question_answer58)
A body of mass m falls from a height R above the surface of the earth, where R is the radius of the earth. What is the velocity attained by the body on reaching the ground? Acceleration due to gravity on the surface of the earth is g?
A)
\[gR\] done
clear
B)
\[\sqrt{gR}\] done
clear
C)
\[\sqrt{\frac{g}{R}}\] done
clear
D)
\[\frac{g}{R}\] done
clear
View Solution play_arrow
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question_answer59)
If the gravitational force of earth suddenly disappears, then which of the following is correct?
A)
Weight of the body is zero done
clear
B)
Mass of the body is zero done
clear
C)
Both mass and weight becomes zero done
clear
D)
Neither the weight nor the mass is zero. done
clear
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question_answer60)
Weightlessness produced in a spaceship is due to
A)
absence of inertia done
clear
B)
absence of gravity due to earth done
clear
C)
absence of accelerating force done
clear
D)
free fall of the spaceship done
clear
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question_answer61)
Where is the intensity of the gravitational field of the earth maximum?
A)
Centre of earth done
clear
B)
Equator done
clear
C)
Poles done
clear
D)
Same everywhere done
clear
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question_answer62)
On the surface of the earth, force of gravitational attraction between two masses kept at distance d apart is 6 Newtons. If these two masses are taken to the surface of the moon and kept at the same distance d, the force between them will be
A)
1N done
clear
B)
36 N done
clear
C)
\[\frac{1}{6}\]N done
clear
D)
6N done
clear
View Solution play_arrow
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question_answer63)
If the speed of rotation of earth about its axis increases, then the weight of the body at the equator will
A)
increase done
clear
B)
decrease done
clear
C)
remain unchanged done
clear
D)
sometimes decrease and sometimes increase done
clear
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question_answer64)
A satellite is going around the earth. Which of the following statement is not correct?
A)
It is freely falling body done
clear
B)
It experiences no acceleration done
clear
C)
It is moving with constant speed done
clear
D)
Its angular momentum is constant done
clear
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question_answer65)
Time period of simple pendulum in a satellite is
A)
infinite done
clear
B)
(6) zero done
clear
C)
\[\text{2 sec}\] done
clear
D)
cannot be calculated done
clear
View Solution play_arrow
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question_answer66)
For moon, its mass is \[\frac{1}{81}\] of earth's mass and its diameter is \[\frac{1}{3.7}\]of earth's diameter. If acceleration due to gravity of earth surface is\[\text{9}\text{.8 m}/{{\text{s}}^{\text{2}}}\], then at moon its value is
A)
\[\text{2}.\text{86 m}/{{\text{s}}^{\text{2}}}\] done
clear
B)
\[\text{1}.\text{65 m}/{{\text{s}}^{\text{2}}}\] done
clear
C)
\[\text{8}.\text{65 mi}{{\text{s}}^{\text{2}}}\] done
clear
D)
\[\text{5}.\text{16 m}/{{\text{s}}^{\text{2}}}\] done
clear
View Solution play_arrow
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question_answer67)
The acceleration due to gravity is
A)
It is more at the equator than at the poles done
clear
B)
It is not effected by the rotation of the earth done
clear
C)
It is effected by the rotation of the earth done
clear
D)
It is not effected by the latitude done
clear
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question_answer68)
If the change in the value of g at a height h above the surface of the earth is the same as at a depth \[X\] below it when both \[X\] and h are much smaller than the radius of the earth, then
A)
\[x=h\] done
clear
B)
\[x=2h\] done
clear
C)
\[x=\frac{h}{2}\] done
clear
D)
\[x=\frac{h}{3}\] done
clear
View Solution play_arrow
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question_answer69)
If the earth shrinks to half of its radius, its mass remaining same, the weight of an object on earth will change ...... times ?
A)
2 done
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B)
3 done
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C)
4 done
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D)
5 done
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question_answer70)
Moon has no atmosphere because
A)
it is a satellite of earth done
clear
B)
it does not have population done
clear
C)
it is colder than earth done
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D)
r.m.s velocity of all the gases is more than the escape velocity from its surface done
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question_answer71)
A ball is dropped from a spacecraft revolving around the earth at height of 120 km. What will happen to the ball?
A)
It will continue to move with the same speed along the original orbit of spacecraft done
clear
B)
It will move with the same speed, tangentially to the spacecraft done
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C)
It will fall down to the earth gradually done
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D)
It will go very far in space done
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question_answer72)
The radius of earth is about 6400 km and that of mars is 3200 km. Thus mass of the earth is about 10 times mass of mars. An object weighs 200 N on the surface of earth. Then its weight on the surface of mars will be
A)
80 N done
clear
B)
40 N done
clear
C)
20 N done
clear
D)
8N done
clear
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