CBSE Class-8 Science: Questions 367 - 373 of 469

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Question number: 367

» Sound » Property of Sound » Noise Pollution

MCQ▾

Question

Ways of reducing unwanted noise pollution are:

Choices

Choice (4) Response

a.

Vehicle exhaust systems are fitted with silencers

b.

Use of sound insulating materials

c.

Designing quieter engines

d.

All a. , b. and c. are correct

Question number: 368

» Some Natural Phenomena » Types of Charges and Their Interactions » Negative Charges

MCQ▾

Question

Rubber rod rubbed with fur having a:

Choices

Choice (4) Response

a.

Having no charge

b.

Positively charged

c.

Negatively charged

d.

Question does not provide sufficient data or is vague

Question number: 369

» Some Natural Phenomena » The Story of Lightning » Lightning Conductors

MCQ▾

Question

Lightning conductor works on the effect

Choices

Choice (4) Response

a.

Discharging

b.

Earthing

c.

Action at points

d.

Grounding

Question number: 370

» Sound » Property of Sound » Noise and Music

MCQ▾

Question

Musical sounds are:

Choices

Choice (4) Response

a.

Pleasant sounds

b.

Unpleasant sounds

c.

Unwanted sounds

d.

Excessive sounds

Question number: 371

» Friction » Increasing and Reducing Friction » Wheels Reduce Friction

MCQ▾

Question

Trading of tyre is done:

Choices

Choice (4) Response

a.

Has no effect on friction

b.

To Increase the friction

c.

To Decrease the friction

d.

Question does not provide sufficient data or is vague

Question number: 372

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

MCQ▾

Question

Liquids which conduct electricity are:

Choices

Choice (4) Response

a.

Solution of acids

b.

Solutions of bases

c.

Salt solution

d.

All a. , b. and c. are correct

Question number: 373

» Some Natural Phenomena » Earthquakes » Protection Against Earthquakes

MCQ▾

Question

How to protect your property during earthquake?

Choices

Choice (4) Response

a.

Bolt bookcases China cabinets and other tall furniture to wall studs

AND

Your house is bolted to its foundation

b.

Your buildings evaluated by professional structural design engineer

c.

Repair any deep cracks in ceilings or foundations

d.

All a. , b. and c. are correct

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