Questions are taken verbatim from the NCERT textbook; answers were grounded against the chapter's content during generation. Items needing review are marked.
Your Progress - Chapter 80% complete
1Exercises10 questions
Q.1Give two examples each of pushing or pulling to change the state of motion of objects.v
Answer:Push: pushing a trolley, kicking a football. Pull: pulling a drawer, drawing water from a well with a rope.
Q.2Give two examples where applied force changes the shape of an object.v
Answer:Squeezing a sponge and stretching a rubber band.
Q.3Fill in the blanks: draw water by ___ the rope; charged body ___ uncharged body; loaded trolley must be ___; north pole ___ north pole.v
Answer:Pulling; attracts; pushed; repels.
Q.4Fill terms for the archer and arrow situation: muscular, contact, non-contact, gravity, friction, shape, attraction.v
Answer:(a) shape (b) muscular (c) contact (d) gravity and friction.
Q.5Identify agent, object and effect of force in lemon squeezing, toothpaste tube, load on spring, and high jump.v
Answer:Lemon: fingers act on lemon and change its shape. Toothpaste: fingers act on tube and push paste out. Spring: suspended load pulls spring and stretches it. High jump: athlete pushes ground; ground reaction changes athlete's motion upward.
Q.6How does hammering affect a hot piece of iron?v
Answer:The force changes the shape of the hot iron so it can be made into a tool.
Q.7What force makes a rubbed inflated balloon stick to a wall?v
Answer:Electrostatic force.
Q.8Name forces on a bucket of water held above ground and explain why it does not move.v
Answer:Gravity pulls the bucket downward and muscular force from the hand pulls upward. These balanced forces keep the bucket at rest.
Q.9Name two forces acting on a rocket immediately after leaving the launching pad.v
Answer:Upward thrust from expelled gases and downward gravitational force.
Q.10Water rises in a dropper after releasing the pressed bulb because ofv
- a. pressure of water
- b. gravity of the earth
- c. shape of rubber bulb
- d. atmospheric pressure
Answer:(d) atmospheric pressure.