CBSE Class-7 Science: Questions 260 - 266 of 322

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Question number: 260

» Wastewater Story » Waste Water Treatment Plant » Bar Screen

MCQ▾

Question

Bar screen removes the:

Choices

Choice (4) Response

a.

Sludge

b.

Coarse and floating solids from the sewage

c.

Grit and sand removal

d.

None of the above

Question number: 261

» Light » Light » Properties of Light

MCQ▾

Question

Light is a:

Choices

Choice (4) Response

a.

Light travels in a straight line

b.

Light enables us to look around

c.

Light is a form of energy

d.

All a. , b. and c. are correct

Question number: 262

» Light » Spherical Mirrors » Concave Mirror

MCQ▾

Question

Convex mirror has:

Choices

Choice (4) Response

a.

Inner surface is polished

b.

Outer curved surface is reflecting

c.

Both a. and b. are correct

d.

None of the above

Question number: 263

» Light » Spherical Mirrors » Real Image and Virtual Image

MCQ▾

Question

Type of image formed by the plane mirror is:

Choices

Choice (4) Response

a.

Real

b.

Virtual & Erect and formed behind the mirror

c.

Virtual

d.

Erect and formed behind the mirror

Question number: 264

» Wastewater Story » Water, Our Lifeline » Cleaning of Water

MCQ▾

Question

Cleaning water is the process of removing:

Choices

Choice (4) Response

a.

Suspended solids and gases from water

b.

Undesirable chemicals from water

c.

Biological contaminants from water

d.

All a. , b. and c. are correct

Question number: 265

» Water: A Precious Resource » Ground Water » Water Table

MCQ▾

Question

Type of water, which forms the water table, is:

Choices

Choice (4) Response

a.

Ground Water

b.

Water collected between the soil particles and rocks

c.

Rain water

d.

All a. , b. and c. are correct

Question number: 266

» Wastewater Story » Waste Water Treatment Plant » Grit and Sand Removal Tank

MCQ▾

Question

In the wastewater treatment plant wastewater is passed after screening into the:

Choices

Choice (4) Response

a.

Grit and sand removal tank

b.

Aeration

c.

Sedimentation tank

d.

None of the above

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