9th Class Science Gravitation and Floatation Question Bank

done Gravitation Total Questions - 72

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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)
    done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• 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

• 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

• 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

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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

• 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

• 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
  View Solution play_arrow

• 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

• 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 clear
  B)
   3 done clear
  C)
   4   done clear
  D)
   5 done clear
  View Solution play_arrow

• 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 clear
  D)
   r.m.s velocity of all the gases is more than the escape velocity from its surface   done clear
  View Solution play_arrow

• 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 clear
  C)
   It will fall down to the earth gradually done clear
  D)
   It will go very far in space done clear
  View Solution play_arrow

• 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
  View Solution play_arrow