CBSE Class-7 Science: Questions 289 - 296 of 322

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Question number: 289

» Wastewater Story » Waste Water Treatment Plant » Water Clarifier

MCQ▾

Question

Primary water clarifier is:

Choices

Choice (4) Response

a.

Sedimentation tanks

b.

Bar Screen

c.

Grit chambers

d.

All of the above

Question number: 290

» Light » Reflection of Light » Mirror

MCQ▾

Question

Curved mirror is called as:

Choices

Choice (4) Response

a.

Concave mirror

b.

Spherical mirror

c.

Parabolic mirror

d.

Convex mirror

Question number: 291

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

MCQ▾

Question

Different kinds of plants present in forest are:

Choices

Choice (4) Response

a.

Amla, bamboo, kachnar

b.

Semal, Sheesham, Neem, peepal, fig, khair

c.

Sal, Teak, Banyan

d.

All a. , b. and c. are correct

Question number: 292

» Electric Current and Its Effects » Symbols of Electric Components » Battery

MCQ▾

Question

Two or more cells in a series combination forms:

Choices

Choice (4) Response

a.

Circuit diagram

b.

Fuse

c.

Battery

d.

Electric circuit

Question number: 293

» Wastewater Story » Water, Our Lifeline » Waste Water

MCQ▾

Question

Water flowing down the drain is called as:

Choices

Choice (4) Response

a.

Waste water

b.

Sewage

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

Question number: 294

» Light » Reflection of Light » Mirror

MCQ▾

Question

A highly polished reflecting surface that can return the rays of light into the same medium is called as:

Choices

Choice (4) Response

a.

Lens

b.

Newton’s disc

c.

Mirror

d.

None of the above

Question number: 295

» Wastewater Story » Waste Water Treatment Plant » Aerator Tank

MCQ▾

Question

Pumping of air in clarified water is called as the:

Choices

Choice (4) Response

a.

Biogas

b.

Aeration

c.

Aerobic bacteria

d.

Question does not provide sufficient data or is vague

Question number: 296

» Wastewater Story » Better House Keeping Practices » Conservation of Water

MCQ▾

Question

Some methods to conserve the water are:

Choices

Choice (4) Response

a.

Mop the floors instead of washing them

b.

Adopt rain harvesting technique

c.

Avoid wastage of water

d.

All a. , b. and c. are correct

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