Friction (CBSE Class-8 Science): Questions 8 - 15 of 17

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Question number: 8

» Friction » Increasing and Reducing Friction » Fluid Friction

MCQ▾

Question

Gases and liquids are called:

Choices

Choice (4) Response

a.

Fluids

b.

Viscous drag

c.

Drag

d.

All of the above

Question number: 9

» Friction » Friction- a Necessary Evil » How Friction Is Useful

MCQ▾

Question

Friction helps to:

Choices

Choice (4) Response

a.

Walk or run

b.

Holding objects

c.

Write on paper

d.

All a. , b. and c. are correct

Question number: 10

» Friction » Increasing and Reducing Friction » Rolling Friction

MCQ▾

Question

Rolling friction:

Choices

Choice (4) Response

a.

Increases the friction

b.

Lesser than sliding friction

c.

Has no effect

d.

Reduces the friction

Question number: 11

» Friction » Factors Effecting Friction » Surface Irregularities

MCQ▾

Question

Force of friction depends upon the:

Choices

Choice (4) Response

a.

Greater the roughness of the two surfaces greater is the force of friction

b.

State of smoothness of two surfaces

c.

State of roughness of two surfaces

d.

Both a. and c. are correct

Question number: 12

» Friction » Increasing and Reducing Friction » Lubricants

MCQ▾

Question

Lubrication is a process of:

Choices

Choice (4) Response

a.

Fluid friction

b.

Converting dry friction into wet friction

c.

Use of lubricants for reducing friction

d.

Both b. and c. are correct

Question number: 13

» Friction » Increasing and Reducing Friction » Fluid Friction

MCQ▾

Question

To overcome drag objects moving through fluid are given special shapes is called as

Choices

Choice (4) Response

a.

Lubrication

b.

Ball bearing

c.

Treading

d.

Streamlining of the object

Question number: 14

» Friction » Force of Friction » Introduction to Force of Friction

MCQ▾

Question

The force which will apply a reaction is:

Choices

Choice (4) Response

a.

Point of contact

b.

Force of friction

c.

Relative motion

d.

Area of contact

Question number: 15

» Friction » Friction- a Necessary Evil » How Friction Is Useful

MCQ▾

Question

Due to fiction:

Choices

Choice (4) Response

a.

Ropes and strings can be tied

b.

Nails remain fixed

c.

Matchsticks and strings can be tied

d.

All a. , b. and c. are correct

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