Science - Grade 8 (C ...

Q1. Fill in the blanks.

                           i.        To draw water from a well we have to _________ at the rope.

                          ii.        A charged body _________ an uncharged body towards it.

                         iii.        To move a loaded trolley we have to __________________ it.

                         iv.        The north pole of a magnet ______ the north pole of another magnet.

                          v.        The atmospheric pressure is due to the weight of ________ present in the atmosphere above us.

                        vi.        Force has ________________ as well as direction.

         vii.        Liquids exert equal pressure at the same __________.

         viii.        Liquids and gases exert pressure on the ___________ of their containers.

 

Q2. True/False

                          i.        Air exerts pressure in all directions. _______

                         ii.        The north pole of a magnet attracts the north pole of another magnet. ________

                        iii.        The pressure exerted by a liquid depends on the area of base of its container. ________

                        iv.        To draw water 'from a well, we have to apply push force at the rope. _________

                         v.        A force arises due to the interaction between two objects. ________

                        vi.        The strength of a force is usually expressed by its magnitude. _______

 

Q3. What is the unit of force?

 

Q4. Give one example where force moves a stationary object.

 

Q5. Give one example where force stops a moving object.

 

Q6. What is force?

 

Q7. Does liquid exert pressure in all directions?

 

Q8. Why does the shape of tooth paste tube change when we squeeze it?

 

Q9. What can bring change in state of motion of an object?

 

Q10. Which force can be used to gather iron pins scattered on the floor?

 

Q11. Which force do the animals apply while moving, chewing and doing other activities?

 

Q12. Which force is responsible for raising our body hair when we try to take off a terylene or polyester shirt in the dry weather?

 

Q13. Write one example where force changes the speed of a moving object.

 

Q14. Why does a boat come to rest when we stop rowing it?

 

Q15. Write any two application of atmospheric pressure in our everyday life.

 

Q16. Explain why, snow shoes stop you from sinking into snow.

 

Q17. What happens to the springs fixed to the seat of a bicycle when we sit on it?

 

Q18. Give one practical application of magnetic force.

 

Q19. Give one example from daily life where force changes the shape of an object.