3rd Class Science Lights, Sound and Force Question Bank

done Light Sound and Force Total Questions - 20

• question_answer1)
  Select the odd one out.
  A)
         done clear
  B)
                    done clear
  C)
                       done clear
  D)
                 done clear
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• question_answer2)
  Ritu cannot hear what Megha is saying, X must be ______.                
  A)
   Solid                           done clear
  B)
          Liquid             done clear
  C)
          Gas                             done clear
  D)
          Vacuum                                              done clear
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• question_answer3)
  Sahil shone a torch and blew a horn at the same time, while standing at 15m distance from Amit. Amit will _______.
  A)
   First hear the sound then see the light done clear
  B)
          First see the light then hear the sound done clear
  C)
          See the light and hear the sound at the same time done clear
  D)
          None of these done clear
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• question_answer4)
  X is a force that works in the opposite direction of movement of an object in contact with a surface.                                                      . It is _____.
  A)
   Gravity           done clear
  B)
          Push               done clear
  C)
          Pull                             done clear
  D)
          Friction done clear
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• question_answer5)
  Look at the picture and select the correct option regarding it.
  A)
   There is no force acting on the book. done clear
  B)
          Book is under the effect of gravity of Earth. done clear
  C)
          Table is applying a push on the book. done clear
  D)
          None of these done clear
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• question_answer6)
  The object shown here, does not cast a shadow. It is most likely made up of X material. X could be  
  A)
   Metal                                                            done clear
  B)
          Ceramic                 done clear
  C)
                                         Clear plastic sheet done clear
  D)
          Frosted glass.                                         done clear
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• question_answer7)
  Select the odd one out on the basis of type of mechanical force involved.
  A)
   Opening the door of a refrigerator done clear
  B)
          Playing tug of war done clear
  C)
          Hitting the cricket ball with a bat to make run done clear
  D)
          Taking out water from a well using rope attached to a bucket done clear
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• question_answer8)
  Four boys rolled oil drums of the same weight and size up the ramps of different heights as shown here. Which one of them put the most effort?
  A)
     done clear
  B)
           done clear
  C)
           done clear
  D)
           done clear
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• question_answer9)
  The given diagram shows a fishing boat which sends out ultrasound waves that return after a few seconds. Select the correct statement regarding this.
  A)
   The ultrasound waves are used to locate the shoal of fish. done clear
  B)
          The ultrasound waves are reflected back from the shoal of fish. done clear
  C)
          Sound can travel in water. done clear
  D)
          All of these done clear
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• question_answer10)

  Aman went to watch a football match. He wrote his experience on a picture card as shown here.

  His father explained that it is the force applied on the football which causes it to _____.

            
  A)
  Move faster or slower done clear
  B)
  Stop moving done clear
  C)
  Change its direction of motion done clear
  D)
  All of these done clear
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• question_answer11)
  Roy wants to make a list of actions that show friction produces heat. Which of the following could he include in his list?

  (a) Rubbing hands together

  (b) Scratching a match stick against the box

  (c) Sawing wood

  (d) Drilling a hole into metal sheet

  (e) Rubbing off some pencil marks with an eraser

   
  A)
  (a) and (e) only                   done clear
  B)
  (a), (b) and (e) only done clear
  C)
  (a), (b), (c) and (e) only           done clear
  D)
  (a), (b), (c), (d) and (e) done clear
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• question_answer12)
  Select the forces that the women X and Y in the diagram need to overcome to carry their groceries.            
  A)

  X	Y
  X-Gravity	Y-Friction

                  done clear
  B)
        

  X	Y
  X-Friction	Y-Gravity

                  done clear
  C)
        

  X	Y
  X-Friction	Y-Friction

                  done clear
  D)
        

  X	Y
  X-Pull	Y-Push

  done clear
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• question_answer13)
  Nidhi was asked to draw the shadow of a tumbler formed on the screen behind it, when it is kept in different manners at the same position and light is shone on it from the same direction. She drew three shadows as shown here.

  Read the following statements regarding it and select the INCORRECT ones.

  (i) Shadow 1 is formed when the tumbler is kept horizontally.

  (ii) Shadow 2 is formed when the tumbler is kept vertically upright.

  (iii) Shadow 3 is incorrect because the given tumbler cannot cast a rectangular shadow.

     
  A)
  (i) and (ii) only            done clear
  B)
  (ii) and (iii) only          done clear
  C)
  (i) and (iii) only       done clear
  D)
  None of these  done clear
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• question_answer14)
  Q can hear the sound made by P in the shortest time, when the medium is a _______.
  A)
   Brick wall        done clear
  B)
          Water              done clear
  C)
          Air                              done clear
  D)
          Vacuum          done clear
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• question_answer15)
  Refer to the given figure and select the correct option.
  A)
   If \[W=X,\]box will move towards W. done clear
  B)
          If \[W>X,\]the box will move towards X. done clear
  C)
          If \[W=X,\]the box will move towards X. done clear
  D)
          If \[W<X,\]the box will move towards X. done clear
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• question_answer16)

  A torch is shone on a wooden prism and a beach ball as shown below.

  What will be the shape of shadow observed on the screen?

     
  A)
                         done clear
  B)
  done clear
  C)
                         done clear
  D)
              done clear
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• question_answer17)
  The above figures show the force required to move a 100 g object over different surfaces. The friction is greatest at ____.  
  A)
  Surface W       done clear
  B)
  Surface X                    done clear
  C)
  Surface Y        done clear
  D)
  Surface Z        done clear
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• question_answer18)

  Sandhya made a musical instrument as shown in the figure using large wooden box, a broom handle and a length of string.

  She tightened the string by pulling harder on the broom handle. What kind of sound will she hear now?

   
  A)
  A higher pitched note done clear
  B)
  A louder note done clear
  C)
  A lower pitched note done clear
  D)
  None of these done clear
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• question_answer19)
  The girl a is putting more efforts to pull the sack bag as compared to the girl b. Girl a has to work more against a force which also _______.
  A)
  Changes the direction of a moving object done clear
  B)
  Causes all objects to fall to the ground done clear
  C)
  Prevents us from slipping when we walk done clear
  D)
  Makes a stationary object to move done clear
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• question_answer20)

  Ashish shone a torch at a ball. The shadow of the ball is projected onto a screen as shown.

  What could Ashish do to get a smaller shadow of the ball on the screen?

   

  1. Move the ball closer to the screen.

  2. Move the torch further away from the ball.

  3. Move the screen further away from the ball.

   
  A)
  1 only                          done clear
  B)
  3 only                          done clear
  C)
  1 and 2 only   done clear
  D)
  2 and 3 only done clear
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