CBSE Class-8 Science: Questions 361 - 366 of 469

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Question number: 361

» 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: 362

» 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: 363

» Sound » Sound Needs a Medium for Propagation » Sound Travelling Through Solids and Liquids

MCQ▾

Question

Sound can travel through

Choices

Choice (4) Response

a.

Liquids

b.

Solid

c.

Gases

d.

All a. , b. and c. are correct

Question number: 364

» 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: 365

» Chemical Effects of Electric Current » Do Liquids Conducts Electricity? » Concept of Electric Current

MCQ▾

Question

It is quite possible that even though the liquid allows the electric current to pass through it, the circuit is complete and the bulb does not glow can you reason out why?

Choices

Choice (4) Response

a.

If the current in the circuit is too small the filament of the bulb does not get heated to a high temperature and bulb does not glow

b.

If opposition offered by the substance is small the current will be large and bulb glows

c.

If opposition is large current is small

d.

Both a. and c. are correct

Question number: 366

» 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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