Science-Class-7 NCERT (NCERT Based General Studies (GS)): Questions 247 - 252 of 322

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Question number: 247

» Science » Class-7 NCERT » Light (Images Formed by Lenses)

MCQ▾

Question

A lens, which is thicker at the middle than at edges, is called as:

Choices

Choice (4) Response
a.

Convex lens & Converging lens

b.

Converging lens

c.

Concave lens

d.

Convex lens

Question number: 248

» Science » Class-7 NCERT » Water: A Precious Resource (Water Management )

MCQ▾

Question

Drip irrigation is:

Choices

Choice (4) Response
a.

Technique of watering plants and save waters

b.

Technique employed to save water

c.

Method of irrigation

d. None of the above

Question number: 249

» Science » Class-7 NCERT » Wastewater Story (Waste Water Treatment Plant)

MCQ▾

Question

Processes of sludge treatment are:

Choices

Choice (4) Response
a.

Solid Composting, Incinerating

b.

Incinerating, Dewatering, solid composting

c.

Dewatering, Solid composting

d. All a. , b. and c. are correct

Question number: 250

» Science » Class-7 NCERT » Electric Current and Its Effects (Electromagnet)

MCQ▾

Question

Springy metal strip in an electric bell is used to:

Choices

Choice (4) Response
a.

Produce sound

b.

Adjust the contact between metal strip and mains

c.

Making and breaking the contacts

d. Question does not provide sufficient data or is vague

Question number: 251

» Science » Class-7 NCERT » Wastewater Story (Sanitation and Disease)

MCQ▾

Question

The practice of open defecation leads to:

Choices

Choice (4) Response
a.

Contamination of sources of underground water like wells, tubewells

b.

Soil Contamination

c.

Contamination of water tables

d. All a. , b. and c. are correct

Question number: 252

» Science » Class-7 NCERT » Electric Current and Its Effects (Magnetic Effect of Electric Current)

MCQ▾

Question

Needle of a compass always points towards the:

Choices

Choice (4) Response
a.

South-North direction

b.

North-South direction

c.

South-South direction

d.

North-North direction

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