Question

Chapter - 11 (Force and pressure) 1. Example of non contact force is/are :- a. magnetic force b. gravitational force c. electrostatic force d. all the above 2. 1 kg-wt is equivalent to :- a. 9 N b. 9.8 N c. 8 N d. 8.8 N 3. A push or a pull applied on an object is defined as :- a. force b. area c. pressure d. speed 4. Tennis player will send the ball to his contender by :- a. pushing b. pulling c. hitting d. lifting 5. Match the column :- a. force. i) contact force b. pressure. ii) measure of gravity on object c. friction iii) force per unit area d. gravity. iv) push and pull e. weight v) action at a distance force 6. Fill in the blanks :- a. ______ is required to move things . b. ______ can stop a moving object. c. Moving object has its own force, due to its ______ . d. The ______ of an object is the measure of force of gravity produced on it. e. To open a car door and get inside we must ______ the door. 7. Define atmospheric pressure. 8. A force of 35 N acts over an area of 7 square meter. Calculate the pressure? 9. Why do some people suffer from nose bleeding at higher altitudes. 10. Why do deep sea divers wear special suit. 11. Prove that pressure exerted by water at the bottom of the container depends on the height of its column. (With the help of an activity)

Answer 1

1) all the given forces r non contact forces....so option D

2) 1 kg-wt = 9.8 N....so option B

3) force

4) it should be hitting...

6) ...a. force

b. force

c. motion

d. weight