Student Questions

Showing: Class 7 (364 questions)

• by Y.JESSICA GEONA RAJ · Class 7

  Assertion: When we look into the mirror, we see our own face inside the mirror Reason: Mirror is made of a transparent substance that allows light to pass through it.

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• by Y.JESSICA GEONA RAJ · Class 7

  Assertion: Never ever look directly at the sun that could be extremely harmful for eyes. Reason: Pinhole camera can be used to see very bright objects.

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• by Y.JESSICA GEONA RAJ · Class 7

  Bouncing back of light from shining surfaces is called

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• by Y.JESSICA GEONA RAJ · Class 7

  Which types of objects do not allow light to pass through them?

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• by Y.JESSICA GEONA RAJ · Class 7

  Light travels in:

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• by Y.JESSICA GEONA RAJ · Class 7

  Assertion (A): A force can change the shape of an object. Reason (R): When force is applied, only the mass changes, not the shape.

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• by Y.JESSICA GEONA RAJ · Class 7

  Assertion (A): In first-class levers, increasing the effort arm makes lifting easier. Reason (R): A longer effort arm requires less force to lift the same load.

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• by Y.JESSICA GEONA RAJ · Class 7

  Which part of the scissors acts as the fulcrum?

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• by Y.JESSICA GEONA RAJ · Class 7

  If the effort arm is longer than the load arm in a first-class lever, what happens?

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• by Y.JESSICA GEONA RAJ · Class 7

  In a seesaw, what happens when the fulcrum is moved closer to the heavier child?

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• by Y.JESSICA GEONA RAJ · Class 7

  Which of the following is an example of a first-class lever?

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• by Y.JESSICA GEONA RAJ · Class 7

  In a first-class lever, where is the fulcrum located?

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• by Y.JESSICA GEONA RAJ · Class 7

  What happens when you press a sponge?

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• by Y.JESSICA GEONA RAJ · Class 7

  A moving toy car hits a wall and stops. What caused the toy car to stop?

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• by Y.JESSICA GEONA RAJ · Class 7

  A student tries lifting a heavy stone with a short crowbar and fails. What should he do to make lifting easier

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• by Y.JESSICA GEONA RAJ · Class 7

  A painter uses a long-handled scraper to remove old paint from a wall. How does increasing the handle length help?

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• by Y.JESSICA GEONA RAJ · Class 7

  A seesaw and scissors are both first-class levers. What common feature do they share?

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• by Y.JESSICA GEONA RAJ · Class 7

  You press a sponge and it changes shape. Which other situation shows the same effect of force?

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• by Y.JESSICA GEONA RAJ · Class 7

  A ball rolling on the floor eventually slows down and stops. Why?

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• by Y.JESSICA GEONA RAJ · Class 7

  . A rubber band becomes longer when you pull it. What effect of force are you observing?

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