9th Class Science Time and Motion Question Bank

done Motion Total Questions - 83

• question_answer1)
  Unit of acceleration is
  A)
   m/s                                       done clear
  B)
   ms done clear
  C)
  \[\text{m}/{{\text{s}}^{\text{2}}}\]                           done clear
  D)
          none of these done clear
  View Solution play_arrow

• question_answer2)
  A body goes from A to B with a velocity of 20 m/s and comes back B to A with a velocity of 30 m/s. The average velocity of the body during the whole journey is
  A)
   zero                      done clear
  B)
          24 m/s   done clear
  C)
   25 m/s                 done clear
  D)
          none of these done clear
  View Solution play_arrow

• question_answer3)
  If an object covering distances in direct proportion to the square of the time elapsed, then the acceleration is
  A)
   Increasing          done clear
  B)
   decreasing done clear
  C)
   Constant            done clear
  D)
          none of these done clear
  View Solution play_arrow

• question_answer4)
  Velocity-time graph of a body with uniform velocity is a straight line
  A)
   Parallel to x-axis   done clear
  B)
   Parallel to 3/-axis done clear
  C)
   Inclined to x-axis done clear
  D)
   Inclined to y-axis done clear
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• question_answer5)
  Distance travelled by a freely falling body is proportional to
  A)
   Mass of the body done clear
  B)
   Square of the acceleration due to gravity done clear
  C)
   Square of the time of fall   done clear
  D)
   Time of fall done clear
  View Solution play_arrow

• question_answer6)
  The rate of change of displacement with time is
  A)
   Speed                  done clear
  B)
          acceleration done clear
  C)
   Retardation        done clear
  D)
          velocity   done clear
  View Solution play_arrow

• question_answer7)
  Which of the following is not vector quantity?
  A)
   Retardation done clear
  B)
   Acceleration due to gravity done clear
  C)
   Average speed   done clear
  D)
   Displacement done clear
  View Solution play_arrow

• question_answer8)
  If the time-displacement graph of a particle is parallel to the time-axis, then velocity of the particle is
  A)
   Infinity done clear
  B)
   Unity done clear
  C)
   Equal to acceleration of the body done clear
  D)
   Zero   done clear
  View Solution play_arrow

• question_answer9)
  In the velocity-time graph, AB shows that the body has
  A)
   Uniform acceleration          done clear
  B)
   Non-uniform retardation         done clear
  C)
   Uniform speed             done clear
  D)
   Initial velocity OA and is moving with uniform retardation   done clear
  View Solution play_arrow

• question_answer10)
  In the given velocity-time graph, AB shows that the body has
  A)
   Uniform acceleration done clear
  B)
   Uniform retardation done clear
  C)
   Uniform velocity throughout its motion and has zero initial velocity done clear
  D)
   None of these   done clear
  View Solution play_arrow

• question_answer11)
  In the velocity-time graph, the distance travelled by the particle between 1.0 sec and 4.0 sec, is approximately
  A)
   50 m                     done clear
  B)
          40 m   done clear
  C)
   30 m                     done clear
  D)
          20 m done clear
  View Solution play_arrow

• question_answer12)
  If the displacement-time graph for the two particles A and B ^ire straight lines inclined at angles of \[30{}^\circ \] and \[60{}^\circ \] with the time axis, then ratio of the velocities \[{{u}_{A}}:{{u}_{B}}\] Up will be
  A)
   1:2                                         done clear
  B)
   \[1:\sqrt{3}\] done clear
  C)
   \[\sqrt{3}:1\]    done clear
  D)
          1:3   done clear
  View Solution play_arrow

• question_answer13)
  In the given figure, velocity of the body at A is
  A)
   Zero                                        done clear
  B)
   unity                  done clear
  C)
   Maximum            done clear
  D)
          infinite                      done clear
  View Solution play_arrow

• question_answer14)
  The velocity-time graph for a body with non-uniform motion is a straight line
  A)
  Straight line done clear
  B)
  Straight line parallel to \[x\]-axis done clear
  C)
   Straight line parallel to y-axis done clear
  D)
   Curved line   done clear
  View Solution play_arrow

• question_answer15)
  Area under a velocity-time graph gives
  A)
   Time taken by a moving object done clear
  B)
   Distance travelled by a moving object   done clear
  C)
   Acceleration of moving object done clear
  D)
   Retardation of a moving object done clear
  View Solution play_arrow

• question_answer16)
  Which one of the following represents the time-displacement graph of two objects a and b moving with zero relative speed ?
  A)
  done clear
  B)
    done clear
  C)
  done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer17)
  If\[x\] denotes displacement in time t and \[x\] = a cos cot, then for co = 1, the acceleration will be
  A)
  \[\text{a cos t}\]              done clear
  B)
         \[-\text{ a cos t}\]   done clear
  C)
  \[\text{a sin t}\]              done clear
  D)
          \[-\text{ a sin t}\] done clear
  View Solution play_arrow

• question_answer18)
  Displacement y (in m) of a body varies with time t (in sec.) as y = \[=\frac{-2}{3}{{t}^{2}}+16t+2\] How long does the body take to come to rest?
  A)
   8 sec                                     done clear
  B)
   10 sec done clear
  C)
   12 sec                                     done clear
  D)
   16 sec done clear
  View Solution play_arrow

• question_answer19)
  A particle moves along x-axis in such a way that its coordinate (x) varies with time (t) according to the expression, \[x=(2-5t+6{{t}^{2}})m\]. Then the initial velocity of the particle is
  A)
   - 5 m/ sec             done clear
  B)
   - 3 m/sec done clear
  C)
   6 m/sec           done clear
  D)
          3 m/sec done clear
  View Solution play_arrow

• question_answer20)
  A person travels along a straight road for the first I half length with a velocity \[{{u}_{1}}\] and the second half length with a velocity \[{{u}_{2}}\]. Then the mean velocity y is given by
  A)
   \[u=\frac{{{u}_{1}}+{{u}_{2}}}{2}\]                          done clear
  B)
   \[u=\sqrt{{{u}_{1}}{{u}_{2}}}\] done clear
  C)
   \[u=\sqrt{\frac{{{u}_{1}}}{{{u}_{2}}}}\]                 done clear
  D)
   \[\frac{2}{u}=\frac{1}{{{u}_{1}}}+\frac{1}{{{u}_{2}}}\]   done clear
  View Solution play_arrow

• question_answer21)
  If initial velocity of a particle is u (at t = 0) and the acceleration\[f\]is at, then
  A)
  \[v=u+a{{t}^{2}}\]         done clear
  B)
          \[v=u+\frac{a{{t}^{2}}}{2}\]   done clear
  C)
  \[v=u+at\]                          done clear
  D)
   \[v=u\] done clear
  View Solution play_arrow

• question_answer22)
  If a body is thrown up with an initial velocity u and covers a maximum height of A, then h is equal to
  A)
   \[\frac{{{u}^{2}}}{2g}\]                                   done clear
  B)
   \[\frac{u}{2g}\] done clear
  C)
   \[2{{u}^{2}}g\]                                 done clear
  D)
   none of these done clear
  View Solution play_arrow

• question_answer23)
  A body is thrown vertically upwards and rises to a height of 10 m. The velocity with which the body was thrown upwards is \[\left( \text{g }=\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}} \right)\]
  A)
   16 m/s                 done clear
  B)
          15 m/s done clear
  C)
   14 m/s                   done clear
  D)
          12m/s done clear
  View Solution play_arrow

• question_answer24)
  If a body is thrown vertically upward and rises to a height of 10 m, then time taken by the body to reach the highest point is
  A)
   1.043s   done clear
  B)
   1.43 done clear
  C)
   1.024s done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer25)
  Moving with uniform acceleration a body covers 150 m during 10 sec, so that it covers 24 m during the tenth sec. Then the acceleration of the body is
  A)
   \[\text{2 m}/{{\text{s}}^{\text{2}}}\]   done clear
  B)
  \[~\text{3 m }/{{\text{s}}^{\text{2}}}\] done clear
  C)
   \[\text{4 m}/{{\text{s}}^{\text{2}}}\] done clear
  D)
  \[~\text{6 m}/{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer26)
  A truck running along a straight line increases its speed uniformly from 30 m/s to 60 m/s over a time interval 1 min. The distance travelled during this time interval is
  A)
   900m done clear
  B)
   1800m done clear
  C)
   2700m   done clear
  D)
   3600 m done clear
  View Solution play_arrow

• question_answer27)
  A car travels \[\frac{1}{3}\] rd distance on a straight road 0 with a velocity of 10 km/hr, next \[\frac{1}{3}\]rd with velocity 20 km/hr and the last \[\frac{1}{3}\] rd with velocity 60 km/hr. What is the average velocity of the car in the whole journey?
  A)
   4 km/hr               done clear
  B)
          6 km/hr done clear
  C)
   12 km/hr                             done clear
  D)
   18 km/hr   done clear
  View Solution play_arrow

• question_answer28)
  A body starts from rest and moves with a uniform acceleration. The ratio of the distance covered in the \[{{n}^{th}}\] second to distance covered in n seconds is
  A)
   \[\frac{2}{n}-\frac{1}{{{n}^{2}}}\]              done clear
  B)
          \[\frac{1}{{{n}^{2}}}-\frac{1}{n}\] done clear
  C)
   \[\frac{2}{{{n}^{2}}}-\frac{1}{n}\]           done clear
  D)
          \[\frac{2}{n}-\frac{1}{{{n}^{2}}}\] done clear
  View Solution play_arrow

• question_answer29)
  A motor ship covers the distance of 300 km between two localities on a river in 10 hrs downstream and in 12 hrs upstream. Find the flow velocity of the river assuming that these velocities are constant.
  A)
   2.0 km/hr        done clear
  B)
          2.5 km/hr   done clear
  C)
   3 km/hr               done clear
  D)
          3.5 km/hr done clear
  View Solution play_arrow

• question_answer30)
  Driver of a train travelling at 115 km/hr sees on a same track, 100m in front of him, a slow train travelling in the same direction at 25 km/hr. The least retardation that must be applied to faster train to avoid a collision is
  A)
  \[\text{3}.\text{125 m}/{{\text{s}}^{\text{2}}}\]           done clear
  B)
          \[\text{3}.\text{5 m}/{{\text{s}}^{\text{2}}}\] done clear
  C)
  \[\text{2}.\text{75 m}/{{\text{s}}^{\text{2}}}\]          done clear
  D)
          \[\text{3}.0\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer31)
  An electron starting from rest has a velocity that increases linearly with time, i.e. \[u=kt\], where k = (2 m/s)/s. The distance covered in the first three second will be
  A)
   36m                                      done clear
  B)
   27m done clear
  C)
   18 m                     done clear
  D)
          9 m   done clear
  View Solution play_arrow

• question_answer32)
  Distance of the moon from the earth is \[\text{4 }\times \text{ 1}{{0}^{\text{8}}}\] m. The time taken by a radar signal transmitted from the earth to reach the moon is
  A)
   5.2 s done clear
  B)
   1.3 s   done clear
  C)
   2.6 s done clear
  D)
   0.70 s done clear
  View Solution play_arrow

• question_answer33)
  A stone is dropped into a well in which the level of water is h below, the top of the well. If \[v\] is velocity of sound, then time T after which the splash is heard is equal to
  A)
    \[\frac{2h}{v}\]                                               done clear
  B)
   \[\sqrt{\frac{2h}{v}}+\frac{h}{g}\] done clear
  C)
   \[\sqrt{\frac{2h}{g}}+\frac{h}{v}\]                             done clear
  D)
   \[\sqrt{\frac{h}{2g}}+\frac{2h}{v}\] done clear
  View Solution play_arrow

• question_answer34)
  A stone weighing 3 kg falls from the top of a tower 100 m high and buries itself 2 m deep in the sand. The time of penetration is
  A)
   0.09 sec              done clear
  B)
          0.9 sec done clear
  C)
   2.1 sec             done clear
  D)
          1.3 sec done clear
  View Solution play_arrow

• question_answer35)
  The velocity of a body at any instant is 10 m/s. After 5 sec, velocity of the particle is 20 m/s. The velocity at 3 seconds before is
  A)
   8 m/sec               done clear
  B)
   4 m/sec   done clear
  C)
   6 m/sec           done clear
  D)
          7 m/sec done clear
  View Solution play_arrow

• question_answer36)
  A body covers 200 cm in the first 2 sec. and 220 cm in next 4 sec. What is the velocity of the body at the end of 7th second?
  A)
   40 cm/sec           done clear
  B)
   20 cm/sec done clear
  C)
   10 cm/sec             done clear
  D)
   5 cm/sec done clear
  View Solution play_arrow

• question_answer37)
  A boat takes 2 hrs. to travel 8 km and back in still water lake with water velocity of 4 km/hr, then the time taken for going upstream of 8 km and coming back is
  A)
   120 min done clear
  B)
   160mm   done clear
  C)
   200 min done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer38)
  If two bodies of different masses \[{{m}_{1}}\] and \[{{m}_{2}}\] are dropped from different heights \[{{h}_{1}}\] and \[{{h}_{2}}\], then ratio of the times taken by the two to drop through these distances is
  A)
   \[{{h}_{1}}:{{h}_{2}}\]                                   done clear
  B)
   \[{{h}_{2}}/{{h}_{1}}\] done clear
  C)
   \[{{\sqrt{h}}_{1}}:\sqrt{{{h}_{2}}}\]          done clear
  D)
          \[{{h}^{2}}_{1}:{{h}^{2}}_{2}\] done clear
  View Solution play_arrow

• question_answer39)
  A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, then average acceleration during contact is
  A)
   \[\text{21}00\text{m}/{{\text{s}}^{\text{2}}}\]   done clear
  B)
   \[\text{14}00\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  C)
   \[\text{7}00\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  D)
  \[~\text{4}00\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer40)
  A stone is thrown vertically upward with an initial velocity u from the top of a tower, reaches the ground with a velocity 3u. The height of the tower
  A)
   \[\frac{3{{u}^{2}}}{g}\]                 done clear
  B)
          \[\frac{4{{u}^{2}}}{g}\]   done clear
  C)
   \[\frac{6{{u}^{2}}}{g}\]                 done clear
  D)
          \[\frac{9{{u}^{2}}}{g}\] done clear
  View Solution play_arrow

• question_answer41)
  SI unit for the average velocity is
  A)
   m/s                         done clear
  B)
          km/s done clear
  C)
   cm/s                     done clear
  D)
          none of these done clear
  View Solution play_arrow

• question_answer42)
  SI unit of the resultant velocity is
  A)
   m/s                                         done clear
  B)
   km/s done clear
  C)
   cm/s                                     done clear
  D)
   none of these done clear
  View Solution play_arrow

• question_answer43)
  SI unit of the angular velocity is
  A)
   m/s                       done clear
  B)
          rad done clear
  C)
   rad /s                                     done clear
  D)
   m/rad done clear
  View Solution play_arrow

• question_answer44)
  N \[\text{k}{{\text{g}}^{\text{-1}}}\]is the unit of
  A)
   Retardation done clear
  B)
   Acceleration done clear
  C)
   Rate of change of velocity done clear
  D)
   All of! These   done clear
  View Solution play_arrow

• question_answer45)
  If a ball is thrown up with a certain velocity. It attains a height of 40 m and comes back to the thrower, then
  A)
   Total distance covered by it is 40 m done clear
  B)
   Total displacement covered by it is 80 m done clear
  C)
   Total displacement is zero   done clear
  D)
   Total distance covered by it is zero done clear
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• question_answer46)
  Acceleration of a body projected upwards with a certain velocity is
  A)
   \[\text{9}.\text{8 m}/{{\text{s}}^{\text{2}}}\] done clear
  B)
   \[-\text{ 9}.\text{8 m}/{{\text{s}}^{\text{2}}}\]   done clear
  C)
   Zero done clear
  D)
   Insufficient data done clear
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• question_answer47)
  A stone tied to a string is whirled in a circle, and while it is revolving, the rope suddenly breaks. Then the stone
  A)
   Flies off tangentially   done clear
  B)
   Moves radially inward done clear
  C)
   Moves radially outward done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer48)
  The coordinates of moving particle at any time t are given by\[x=a{{t}^{2}}\] and\[\text{y }=\text{ b}{{\text{t}}^{\text{2}}}\]. The speed of the particle is
  A)
   \[2t(a+b)\] done clear
  B)
   \[2t\sqrt{{{a}^{2}}+{{b}^{2}}}\]   done clear
  C)
   \[2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)-2t\left( \sqrt{{{a}^{2}}-{{b}^{2}}} \right)\] done clear
  D)
   \[\sqrt{{{a}^{2}}+{{b}^{2}}}\] done clear
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• question_answer49)
  If a body of mass 0.10 kg is moving on circular path of diameter 1.0 m at the rate of 10 revolutions per 31.4 sec, then centripetal force acting on the body (\[\pi \] = 3.14) is
  A)
   0.2 Newton         done clear
  B)
          2.0 Newton done clear
  C)
   0.02 Newton      done clear
  D)
          20.0 Newton done clear
  View Solution play_arrow

• question_answer50)
  A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction is 0.64, then what is the maximum velocity with which the car can be moved?
  A)
   112 m/s            done clear
  B)
          11.2 m/s   done clear
  C)
   \[\frac{0.64\times 20}{1000}m/s\] done clear
  D)
          \[\frac{1000}{0.64\times 20}m/s\] done clear
  View Solution play_arrow

• question_answer51)
  The earth's radius is 6400 km. It makes one revolution about its own axis in 24 hrs. The centripetal acceleration of a point on its equator is nearly
  A)
  \[\text{34}0\text{ cm}/{{\text{s}}^{\text{2}}}\]         done clear
  B)
          \[\text{34 cm}/{{\text{s}}^{\text{2}}}\] done clear
  C)
  \[\text{3}.\text{4 cm}/{{\text{s}}^{\text{2}}}\]           done clear
  D)
          \[0.\text{34 cm}/{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer52)
  In the previous question, the velocity
  A)
   Increases between point 0 and A done clear
  B)
   Increases between point A and B   done clear
  C)
   Decre ases between points A and B done clear
  D)
   Is zero through out done clear
  View Solution play_arrow

• question_answer53)
  A body moving along a circular path has
  A)
   a constant speed   done clear
  B)
   A constant velocity done clear
  C)
   No tangential velocity done clear
  D)
   No radial acceleration done clear
  View Solution play_arrow

• question_answer54)
  The acceleration of a point on the rim of flywheel 1 m in diameter, if it makes 1200 revolutions per minute is
  A)
   \[\text{87}{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  B)
   \[\text{8}0\text{ }{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  C)
   \[\text{8}00\text{ }{{\pi }^{\text{2}}}\text{ m}/{{\text{s}}^{\text{2}}}\]   done clear
  D)
   none of these done clear
  View Solution play_arrow

• question_answer55)
  A person with a mass of M kg, stands in contact against the wall of a cylindrical drum of radius r rotating with an angular velocity co. If the coefficient of friction between the wall and the clothing is  then minimum rotational speed of  the cylinder which enables the person to remain stuck to the wall when the floor is suddenly removed is
  A)
   \[{{\omega }_{\min }}=\sqrt{\frac{g}{\mu r}}\]   done clear
  B)
          \[{{\omega }_{\min }}=\sqrt{\frac{\mu r}{g}}\] done clear
  C)
   \[{{\omega }_{\min }}=\sqrt{\frac{2g}{\mu r}}\]               done clear
  D)
          \[{{\omega }_{\min }}=\sqrt{\frac{gr}{\mu }}\] done clear
  View Solution play_arrow

• question_answer56)
  A motor car is travelling 30 m/s on a circular road of radius 500 m. It is increasing in speed at the  rate of 2\[\text{m}/{{\text{s}}^{\text{2}}}\]. What is its acceleration?
  A)
   \[\text{3}.0\text{ m}/{{\text{s}}^{\text{2}}}\] done clear
  B)
   \[\text{2}.\text{7 m}/{{\text{s}}^{\text{2}}}\]   done clear
  C)
   \[\text{1}.\text{8 m}/{{\text{s}}^{\text{2}}}\] done clear
  D)
   \[\text{2}.\text{5 m}/{{\text{s}}^{\text{2}}}\] done clear
  View Solution play_arrow

• question_answer57)
  A 2 kg stone at the end of a string 1m long is whirled in a vertical circle. At some point its speed is 4 m/s. The tension of the string is 51.6 N at this instant. Therefore, the stone is
  A)
   At the top of the circle done clear
  B)
   At the bottom of the circle   done clear
  C)
   Half-way down done clear
  D)
   None of these done clear
  View Solution play_arrow

• question_answer58)
  A cane filled with water is revolved in a vertical circle of radius 4 m and the water just does not fall down. The time period of revolution will be
  A)
   1 sec done clear
  B)
   10 sec done clear
  C)
   8 sec done clear
  D)
   4 sec   done clear
  View Solution play_arrow

• question_answer59)
  The velocity-time graph of a body falling from rest under gravity and rebounding from a solid surface is represented by which of the graphs shown in the figure?
  A)
    done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
  View Solution play_arrow

• question_answer60)
  Unit for the rate of change of velocity is
  A)
   m/s                       done clear
  B)
          \[\text{m}/{{\text{s}}^{\text{2}}}\]   done clear
  C)
   N s                         done clear
  D)
          N / s done clear
  View Solution play_arrow

• question_answer61)
  A phonograph record on turn table rotates at 30 rpm. The linear speed of a point on the record at the needle at the beginning of the recording when it is at a distance of 14 cm from the centre is
  A)
   22 cm/ sec        done clear
  B)
          44 cm/sec   done clear
  C)
   48 cm/sec        done clear
  D)
          52 cm/sec done clear
  View Solution play_arrow

• question_answer62)
  A vehicle is moving with a velocity u on a curved road of width b and radius of curvature R. For counteracting the centrifugal force on the vehicle, the difference in elevation required in between the outer and inner edges of the road is
  A)
   \[\frac{{{v}^{2}}b}{Rg}\]                                done clear
  B)
          \[\frac{vb}{Rg}\] done clear
  C)
   \[\frac{v{{b}^{2}}}{Rg}\]                              done clear
  D)
          \[\frac{vb}{{{R}^{2}}g}\] done clear
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• question_answer63)
  A stone of mass 1 kg tied to a light inextensible 10 string of length, L = \[\frac{10}{3}\]m is whirling in a circular 0 path of radius L in a vertical plane. If the ratio of the maximum tension in the string to the minimum is 4 and if g is taken to be 10\[\text{m}/{{\text{s}}^{\text{2}}}\], then speed of stone at the highest point of the circle is
  A)
   20 m / s               done clear
  B)
          \[10\sqrt{3}m/s\] done clear
  C)
   \[50\sqrt{2}m/s\]             done clear
  D)
          10 m / s done clear
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• question_answer64)
  The acceleration-time graph for a body is shown in the figure. The most probable velocity-time graph for the body is
  A)
  done clear
  B)
  done clear
  C)
    done clear
  D)
  done clear
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• question_answer65)
  A cylist moves from a certain point X and goes round a circle radius, r and reaches Y, exactly at the other side of the point X, as shown in the given figure. (i) The displacement of the cylist would be
  A)
   \[\pi r\]               done clear
  B)
                          \[2\pi r\] done clear
  C)
                          \[2r\]    done clear
  D)
                          \[\frac{2\pi }{r}\] done clear
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• question_answer66)
  A cylist moves from a certain point X and goes round a circle radius, r and reaches Y, exactly at the other side of the point X, as shown in the given figure. (ii) The distance covered by the cyclist would be
  A)
   \[\pi r\]      done clear
  B)
   \[2\pi r\] done clear
  C)
   2r                           done clear
  D)
          \[\frac{2\pi }{r}\] done clear
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• question_answer67)
  The relationship between average speed, time and distance is
  A)
   Average speed = distance x time done clear
  B)
   \[\text{Average}\,\text{Speed=}\frac{\text{Total}\,\text{distance}}{\text{Total}\,\text{time}}\]   done clear
  C)
   Time = average speed/distance done clear
  D)
   Distance = average speed x time done clear
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• question_answer68)
  A body moving along a circular path has
  A)
   both constant speed   done clear
  B)
   constant velocity done clear
  C)
   no radial acceleration done clear
  D)
   no tangential velocity done clear
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• question_answer69)
  A ball of mass m is thrown vertically up. Another ball of mass 2m is thrown at an angle 9. Both of them stay in our view for the same period. The heights attained by the two are in the ratio
  A)
   2 : 1                       done clear
  B)
          1 : 1   done clear
  C)
   1 : cos \[\text{ }\!\!\theta\!\!\text{ }\]            done clear
  D)
          1 : sec \[\text{ }\!\!\theta\!\!\text{ }\] done clear
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• question_answer70)
  A ball rolls off the top of a stair way with a horizontal velocity u m/s. If the steps are h metres high and b metres wide, then ball will hit the edge of the nth step, if
  A)
   \[n=\frac{2h{{u}^{2}}}{g{{b}^{2}}}\]         done clear
  B)
          \[n=\frac{2hu}{g{{b}^{2}}}\] done clear
  C)
   \[n=\frac{2{{b}^{2}}}{2h{{u}^{2}}}\]       done clear
  D)
          \[n=\frac{g{{b}^{2}}}{2hu}\] done clear
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• question_answer71)
  When the distance an object travels is directly proportional to the length of time, it is said to travel with
  A)
   Constant speed   done clear
  B)
   Zero velocity done clear
  C)
   Constant acceleration done clear
  D)
   Uniform velocity done clear
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• question_answer72)
  Speed of a body describing its motion is
  A)
   Direction          done clear
  B)
          state done clear
  C)
   Type                     done clear
  D)
          rapidity   done clear
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• question_answer73)
  Which of the given distance-time graph represents the accelerated motion of a body?
  A)
    done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer74)
  Two paper screens A and B are separated by a distance of 100 m. A bullet pierces A and then B. The hole in B is 10 cm below the hole in A. If the bullet is travelling horizontally at A, calculate the velocity of the bullet at A. Neglect the resistance of paper in air.
  A)
   100 m/sec done clear
  B)
   400 m/sec done clear
  C)
   550 m/sec done clear
  D)
   700 m/sec   done clear
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• question_answer75)
  Which of the following represent distance (s) -time (t) graph for a retarded motion?
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer76)
  A rubber ball dropped from a certain height is an example of
  A)
   uniform acceleration done clear
  B)
   uniform retardation done clear
  C)
   uniform speed done clear
  D)
   non-uniform speed   done clear
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• question_answer77)
  If the velocity of a body does not change, its acceleration is
  A)
   Zero                        done clear
  B)
          infinite done clear
  C)
   Unity                    done clear
  D)
          none of these done clear
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• question_answer78)
  An aeroplane, when it is vertically above the point A on the ground, drops a bomb which hits target B on the ground. If the plane is moving at a height of 1.96 km from the ground with a speed of 300 m/sec, then distance between A and B is (neglecting air resistance)
  A)
   3 km                                     done clear
  B)
   6 km   done clear
  C)
   3 m/s                    done clear
  D)
          4 m/s done clear
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• question_answer79)
  A grasshopper can jump a maximum horizontal distance of 0.2 m. If he spends negligible time on ground, with what speed can he travel along the road?
  A)
   1 m/s                      done clear
  B)
          2 m/s done clear
  C)
   3 m/s                    done clear
  D)
          4 m/s done clear
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• question_answer80)
  Ratio of the SI units to CGS units of retardation is
  A)
  \[\text{1}{{0}^{-\text{2}}}~~~~~~~~~~~~~~\]   done clear
  B)
          \[\text{1}{{0}^{\text{2}}}\]   done clear
  C)
   10                                          done clear
  D)
   \[\text{1}{{0}^{-\text{1}}}\] done clear
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• question_answer81)
  Physical quantity corresponding to the rate of change of displacement is
  A)
   Speed                  done clear
  B)
          velocity   done clear
  C)
   Acceleration       done clear
  D)
          retardation done clear
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• question_answer82)
  Velocity of a body at rest is always
  A)
   Unity done clear
  B)
   Negative done clear
  C)
   Zero   done clear
  D)
   Infinite done clear
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• question_answer83)
  When the distance an object travels is directly proportional to the length of time, it is said to travel with
  A)
   Zero velocity done clear
  B)
   Constant speed   done clear
  C)
   Constant acceleration done clear
  D)
   Uniform velocity done clear
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