CBSE (Central Board of Secondary Education- Board Exam) Class-7 Science: Questions 253 - 259 of 322

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Question number: 253

» Wastewater Story » Sewage » Sewers and Sewerages

MCQ▾

Question

The underground pipes, which carry away, dirty drainage water and waste matter from the house is called as:

Choices

Choice (4) Response

a.

Sewer

b.

Sewerage

c.

Gutter

d.

Both a. and c. are correct

Question number: 254

» Electric Current and Its Effects » Electromagnet » What Are Electromagnets

MCQ▾

Question

Electromagnets are used in:

Choices

Choice (4) Response

a.

Used in industry and municipalities

b.

Modern electrical devices

c.

For separating iron from non-magnetic materials

d.

All a. , b. and c. are correct

Question number: 255

» Forests: Our Lifeline » Forest » Various Plants of Forest

MCQ▾

Question

Roof like structure above the ground in forest is called as:

Choices

Choice (4) Response

a.

Understoreys

b.

Canopy

c.

Top Layer

d.

All of the above

Question number: 256

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

MCQ▾

Question

Electric iron and heater works on the principle of:

Choices

Choice (4) Response

a.

Heating effect of the electric current

b.

Amount of heat produced

c.

Resistance offered by the wire

d.

Question does not provide sufficient data or is vague

Question number: 257

» Water: A Precious Resource » How Much Water Is Available » Distribution of Water on Earth

MCQ▾

Question

Water percentage available on earth is:

Choices

Choice (4) Response

a.

71%

b.

97%

c.

3%

d.

All of the above

Question number: 258

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

MCQ▾

Question

Water table is lowered………. .

Choices

Choice (4) Response

a.

Because construction of industry leads to wiping out of forests

b.

Because industries use ground water

c.

Because industries use water through hand pumps, tube wells or submersible pumps

d.

All a. , b. and c. are correct

Question number: 259

» Water: A Precious Resource » How Much Water Is Available » World Water Day

MCQ▾

Question

World water day is celebrated on:

Choices

Choice (4) Response

a.

22nd April

b.

22nd March

c.

1st January

d.

5th June

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