CBSE (Central Board of Secondary Education- Board Exam) Class-7 Science: Questions 311 - 317 of 322

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 322 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 250.00 or

Question number: 311

» Wastewater Story » Polluted Water » Cause of Water Pollution

MCQ▾

Question

Water is polluted from various sources such as from:

Choices

Choice (4) Response

a.

Farms

b.

Mining operations and construction work

c.

Houses, Industries

d.

All a. , b. and c. are correct

Question number: 312

» Light » Reflection of Light » Image Formation

MCQ▾

Question

Image formed by the plane mirror:

Choices

Choice (4) Response

a.

At the object distance

b.

Behind the mirror

c.

In front of mirror

d.

Question does not provide sufficient data or is vague

Question number: 313

» Electric Current and Its Effects » Heating Effect of Electric Current » Miniature Circuit Breaker

MCQ▾

Question

MCB is better than fuse because:

Choices

Choice (4) Response

a.

It exceeds the specified maximum limit

b.

It automatically stops the current

c.

It does not have to be replaced

d.

All a. , b. and c. are correct

Question number: 314

» Wastewater Story » Sewage » Sewers and Sewerages

MCQ▾

Question

Underground network of inter-connected pipes is called as:

Choices

Choice (4) Response

a.

Sewer

b.

Sewerage

c.

Sewage

d.

None of the above

Question number: 315

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

MCQ▾

Question

Heating devices contain wire in the form of a coil is called as:

Choices

Choice (4) Response

a.

Key

b.

Switch

c.

Element

d.

Ammeter

Question number: 316

» Electric Current and Its Effects » Symbols of Electric Components » Symbols for Some Electric Circuit Components

MCQ▾

Question

In the open circuit the flow of current is obstructed by:

Choices

Choice (4) Response

a.

Insulator

b.

Air & Insulator

c.

Air

d.

Conductor

Question number: 317

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

MCQ▾

Question

Wastes which choke the drain are:

Choices

Choice (4) Response

a.

Cotton, Sanitary Napkins

b.

Used tea leaves, solid food remains

c.

Both a. and b. are correct

d.

Question does not provide sufficient data or is vague

f Page
Sign In