NCERT Class VIII Science Solutions: Chapter 12-Friction Part 1

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MULTIPLE CHOICE QUESTIONS

Question1:

Whenever the surfaces in contact tend to move or move with respect to each other, the force of friction comes into play

  1. Only if the objects are solid.

  2. Only if one of the two objects is liquid.

  3. Only if one of the two objects is gaseous.

  4. Irrespective of whether the objects are solid, liquid or gaseous.

Answer: D

Question 2:

In Fig a boy is shown pushing the box from right to left. The force of friction will act on the box

As showing in fig is a The force of friction will act on the box

The Force of Friction Will Act on the Box

As showing in fig is a The force of friction will act on the box

  1. From right to left

  2. From left to right

  3. Vertically downwards

  4. Vertically upwards

Answer: B

Question 3:

To sharpen the blade of a knife by rubbing it against a surface, which of the following will be most suitable?

  1. Stone

  2. Plastic block

  3. Wooden block

  4. Glass block

Answer: A

Question 4:

A toy car released with the same initial speed will travel farthest on

  1. Muddy surface

  2. Polished marble surface

  3. Cemented surface

  4. Brick surface

Answer: C

Question 5:

If we apply oil on door hinges, the friction will

  1. Increase

  2. Decrease

  3. Disappear altogether

  4. Will remain unchanged

Answer: B

Question 6:

Which of the following statements is incorrect?

  1. Friction acts on a ball rolling along the ground.

  2. Friction acts on a boat moving on water.

  3. Friction acts on a bicycle moving on a smooth road.

  4. Friction does not act on a ball moving through air.

Answer: D

Image of friction force on ball

Image of Friction Force on Ball

Image of friction force on ball

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