NSO Level 1- Science Olympiad (SOF) Class 10: Questions 669 - 672 of 986

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Question number: 669

» Sources of Energy

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MCQ▾

Question

Arrange in correct order for working of solar cooker.

(i) When the solar cooker is kept in direct sunlight, the reflector (R) reflects both visible

(ii) Infrared rays get absorbed in the box, which increases its internal temperature up to about

(iii) The black surface of the box and the vessel absorbs it.

(iv) When the inner black surface becomes quite hot, it also starts radiating heat energy in the form of infrared rays, but the upper glass sheet does not allow these rays to pass through it and go outside the box

Choices

Choice (4) Response

a.

(iv), (ii), (i) and (iii)

b.

(i), (iii), (iv) and (ii)

c.

(ii), (iv), (i) and (iii)

d.

(iii), (i), (iv) and (ii)

Question number: 670

» Magnetic Effects of Electric Current

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MCQ▾

Question

A positively charged particle (alpha particle) projected towards west is deflected towards north by a magnetic field. The direction of magnetic field is

Choices

Choice (4) Response

a.

Towards east

b.

Upward

c.

Downward

d.

Towards south

Question number: 671

» Our Environment and Its Management

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MCQ▾

Question

What changes would you suggest in your home in order to be environment-friendly?

Choices

Choice (4) Response

a.

Use drip irrigation for watering the plants

b.

Save energy, turn off lights when not in use

c.

Use kitchen wastes as manure

d.

All a. , b. and c. are correct

Question number: 672

» Light - Reflection and Refraction

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MCQ▾

Question

If reflecting surface is straight and flat that is known as

Choices

Choice (4) Response

a.

Spherical Mirror

b.

Concave Mirror

c.

Plane Mirror

d.

Convex Mirror