8th Class Science Force and Pressure Question Bank

done Force and Pressure Formative Objective Problems Total Questions - 24

• question_answer1)
  The given figure shows a heavy box being pushed and pulled-The number of persons pulling the box is  
  A)
   1                                             done clear
  B)
   2   done clear
  C)
   3                                             done clear
  D)
   4 done clear
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• question_answer2)
  In a game of tug-o-war. Mark pulls the rope with a force of 60 N from the right. Sandy and George pull the rope with respective forces of 40 N and 20 N from the left, as shown in the given figure.  The net force on the rope is 
  A)
   10 N     done clear
  B)
   2 N   done clear
  C)
   60 N                      done clear
  D)
   120 N   done clear
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• question_answer3)
  Sandy, Jackie, Rudy, Ronnie, Cruz, and Harry are pushing a box by applying forces of magnitudes 25 N, 35 N, 45 N, 45 N, 30 N, and 50 N respectively, as shown in the given figure                 Which row shows the net force acting on the box and its consequent motion?
  A)
  Net force (N)                         Motion of the box    20                                             Towards South done clear
  B)

  Net force (N)	Motion of the box
  15	Towards East

  done clear
  C)

  Net force (N)	Motion of the box
  15	Towards West

  done clear
  D)

  Net force (N)	Motion of the box
  20	Towards North

  done clear
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• question_answer4)
  A trolley is moving at a constant speed of 2 m/s. Cole and Paul start pushing the trolley at the same time from opposite directions, as shown in the figure. Both of them are applying a force of 15 N on the trolley. The speed of the trolley will
  A)
   remain the same   done clear
  B)
   become zero done clear
  C)
   decrease           done clear
  D)
   increase done clear
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• question_answer5)
  Jack pushes a big cabinet with a force of 50 N. Under his force, the cabinet moves at a uniform speed. Jenny comes to help Jack. She begins to push the cabinet in the same direction with a force of 30 N. After Jennys arrival, speed of the moving cabinet will
  A)
   increase           done clear
  B)
   decrease done clear
  C)
   remain same                     done clear
  D)
   become zero done clear
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• question_answer6)
  The force applied on an object will not lead to a change in
  A)
   the shape of the object done clear
  B)
   the mass of the object done clear
  C)
   its direction of motion done clear
  D)
   its position done clear
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• question_answer7)
  Bob studies four situations involving various forces. These situations are

  I	A satellite orbiting Earth________
  II	A magnet attracting paper clips____
  iii	A man hitting a cricket ball with a bat
  iv	A magnet repelling another magnet

  The situation in which motion is caused by the direct application of a force is
  A)
   I                                              done clear
  B)
   II    done clear
  C)
   III                           done clear
  D)
   IV done clear
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• question_answer8)
  Which of the following forces is not a non-contact force?
  A)
   Magnetic                            done clear
  B)
   Muscular done clear
  C)
   Electrostatic                      done clear
  D)
   Gravitational done clear
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• question_answer9)
  Four types of motion, which are caused by the action of direct and indirect forces, are described in the table.

  I	Fluttering of a flag because of wind
  II	Falling of a ball on the ground___
  III	Dropping of an apple from a tree
  IV	Falling of water from a bottle____

  Which of the four types of motion is caused by the application of a direct force?
  A)
   I                              done clear
  B)
   II done clear
  C)
   III                                           done clear
  D)
   IV done clear
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• question_answer10)
  Earth revolves around Sun in 365 days. Earth and Sun are not in contact with each other. Earths revolution around Sun is caused by the
  A)
   shape of Sun       done clear
  B)
   shape of Earth done clear
  C)
   force between Earth and Sun done clear
  D)
   distance between Earth and Sun done clear
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• question_answer11)
  Gravitational force is ____i____force, while ___ii___ force is repulsive as well as attractive. The given statement is correctly completed by row
  A)
   i-an attractive; ii-frictional   done clear
  B)
   i-a repulsive, ii-magnetic done clear
  C)
   i- an attractive; ii-Magnetic done clear
  D)
   i-a repulsive; ii- frictional done clear
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• question_answer12)
  A wooden block slides down a rough inclined ramp, as shown in the given figure. The wooden block experiences
  A)
   only frictional force done clear
  B)
   only magnetic force done clear
  C)
   gravitational and magnetic forces done clear
  D)
   frictional and gravitational forces done clear
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• question_answer13)
  Jack is trying to climb a height with the help of a rope, as shown in the given figure. Jack can climb the top by overcoming the
  A)
   tension of the rope done clear
  B)
   friction of the rope done clear
  C)
   magnetic force of Earth done clear
  D)
   gravitational force of Earth done clear
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• question_answer14)
  A heavy stone falls
  A)
   faster than a light stone done clear
  B)
   slower than a light stone done clear
  C)
   with same acceleration as light stone done clear
  D)
   none of these done clear
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• question_answer15)
  A stone is dropped from the roof of a building takes 4s to reach ground. The height of the building is
  A)
   19.6 m                                  done clear
  B)
   39.2 m done clear
  C)
   156.8 m                               done clear
  D)
   78.4 m done clear
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• question_answer16)
  The value of g at pole is
  A)
   greater than the value at the equator done clear
  B)
   less than the value at the equator done clear
  C)
   equal to the value of the equator done clear
  D)
   none of these done clear
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• question_answer17)
  Two bodies A and B of mass 500 g and 200 g respectively are dropped near the earths surface. Let the acceleration of A and B be \[{{a}_{A}}\] and \[{{a}_{B}}\]respectively, then
  A)
   \[{{a}_{A}}={{a}_{B}}\]    done clear
  B)
   \[{{a}_{A}}>{{a}_{B}}\] done clear
  C)
   \[{{a}_{A}}<{{a}_{B}}\]                 done clear
  D)
   \[{{a}_{A}}\ne {{a}_{B}}\] done clear
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• question_answer18)
  A body is thrown up with a velocity of 20 m/s. The maximum height attained by it is approximately
  A)
   80 m                                     done clear
  B)
   60 m done clear
  C)
   40 m                                     done clear
  D)
   20 m done clear
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• question_answer19)
  The weight of a body is 120 N on the earth. If it is taken to the moon, its weight will be about:
  A)
   120 N                                    done clear
  B)
   60 N done clear
  C)
   20 N                      done clear
  D)
   720 N done clear
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• question_answer20)
  A cube of edge 2 cm and mass 10 g is placed on the surface of a table. What is the pressure exerted by the cube on the table?
  A)
   \[0.098\text{ }N/{{m}^{2~}}\]   done clear
  B)
   \[0.196\text{ }N/{{m}^{2}}\] done clear
  C)
   \[122.5\text{ }N/{{m}^{2~}}\]   done clear
  D)
   \[245\text{ }N/{{m}^{2}}\] done clear
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• question_answer21)
  Utpal takes four identical beakers (I, II, III, and IV) and makes a small hole in each of them at the same height from the base. He then fills water in. all the beakers. The water comes out from the holes and falls at distances \[{{d}_{1}},{{d}_{2}},{{d}_{3}}\]and \[{{d}_{4}}\] respectively   from   the   base, where \[{{d}_{1}}<{{d}_{2}}<{{d}_{4}}<{{d}_{3}}\] The amount of water (V) filled in each beaker is related as
  A)
   \[{{V}_{1}}>{{V}_{2}}>{{V}_{3}}>{{V}_{4}}\]        done clear
  B)
    \[{{V}_{3}}>{{V}_{4}}>{{V}_{2}}>{{V}_{1}}\] done clear
  C)
   \[{{V}_{1}}={{V}_{2}}={{V}_{3}}={{V}_{4}}\]                        done clear
  D)
   \[{{V}_{3}}={{V}_{1}}<{{V}_{2}}={{V}_{4}}\] done clear
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• question_answer22)
  The number of air molecules in the atmosphere decreases with an increase in height and vice versa. This causes
  A)
   an increase in atmospheric pressure with an increase in height done clear
  B)
   a decrease in atmospheric pressure with an increase in height done clear
  C)
   an increase in wind speed with an increase in height done clear
  D)
   a decrease in wind speed with an increase in height done clear
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• question_answer23)
  Romesh is climbing a mountain. While climbing, he continuously takes the reading of atmospheric pressure using a barometer. While climbing, Romesh will most probably observe that the height of the mercury column in the barometer
  A)
   keeps decreasing done clear
  B)
   keeps increasing done clear
  C)
   increases first and then decreases done clear
  D)
   decreases first and then increases done clear
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• question_answer24)
  The given figure shows three plastic bottles interconnected through two pipes. Water is filled in each bottle to the same height. Bottle I is then closed in such a manner that no air is able to enter it. If a stone is dropped in bottle III, then the water level will increase in
  A)
   bottle III only done clear
  B)
   both bottles I and II done clear
  C)
   both bottles II and III done clear
  D)
   bottles I, II, and III equally done clear
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