CBSE (Central Board of Secondary Education- Board Exam) Class-7 Science: Questions 318 - 322 of 322

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Question number: 318

» Water: A Precious Resource » Depletion of Ground Water » Increasing Population

MCQ▾

Question

How increasing population decreases the seepage of water into the ground?

Choices

Choice (4) Response

a.

Cementing of paths and grounds at different places

b.

By constructing houses, shops, offices

c.

By construction of pavements

d.

All a. , b. and c. are correct

Question number: 319

» Wastewater Story » Polluted Water » Treatment of Polluted Water

MCQ▾

Question

Treatment of wastewater involves:

Choices

Choice (4) Response

a.

Chemical Processes

b.

Biological processes

c.

Physical processes

d.

All a. , b. and c. are correct

Question number: 320

» Electric Current and Its Effects » Heating Effect of Electric Current » Electric Iron and Heater

MCQ▾

Question

Wattage is defined as:

Choices

Choice (4) Response

a.

Amount of current sufficient to run the appliance

b.

A coil of wire

c.

Unit of electricity

d.

Question does not provide sufficient data or is vague

Question number: 321

» Wastewater Story » Better House Keeping Practices » Various Ways to Prevent Water Pollution

MCQ▾

Question

Some ways to prevent water pollution are:

Choices

Choice (4) Response

a.

Use reusable canvas bags

AND

Reduce, reuse and recycle

b.

Dispose of unwanted paints, house-hold cleaners and gardening product safety

c.

Put litter in the trash

d.

All a. , b. and c. are correct

Question number: 322

» Wastewater Story » Sewage » What Is Sewage

MCQ▾

Question

All types of liquid wastes, which have harmful dissolved substances in it, are called as:

Choices

Choice (4) Response

a.

Sewage

b.

Sewer

c.

Dump

d.

All of the above

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