NSO Level 1- Science Olympiad (SOF) Class 10: Questions 944 - 948 of 986

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Question number: 944

» Acids, Bases and Salts

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MCQ▾

Question

What gas is evolved when a hydrochloric acid reacts with a metal iron?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 945

» Magnetic Effects of Electric Current

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MCQ▾

Question

Commercial electric motors do not use

Choices

Choice (4)Response

a.

An electromagnet to rotate the armature

b.

A soft iron core on which the coil is wound

c.

Effectively large number of turns of conducting wire in the current carrying coil

d.

A permanent magnet to rotate the armature

Question number: 946

» Our Environment and Its Management

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MCQ▾

Question

In an ecosystem, the 10 % of energy available for transfer from one trophic level to the next is in the form of

Choices

Choice (4)Response

a.

Light energy

b.

Mechanical energy

c.

Chemical energy

d.

Heat energy

Question number: 947

» Light - Reflection and Refraction

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MCQ▾

Question

Which of the following correctly depicts reflections in case of plane mirror inclined at

Choices

Choice (4)Response

a.

Reflections in case of plane mirror : Choice A

Reflections in Case of Plane Mirror: Choice A

b.

Reflections in case of plane mirror : Choice B

Reflections in Case of Plane Mirror: Choice B

c.

Reflections in case of plane mirror : Choice C

Reflections in Case of Plane Mirror: Choice C

d.

Reflections in case of plane mirror : Choice D

Reflections in Case of Plane Mirror: Choice D

Question number: 948

» Light - Reflection and Refraction

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MCQ▾

Question

The refracted ray will pass through the second focus for a convex lens, and appear to diverge from the first focus for a concave lens, this will happen when

Choices

Choice (4)Response

a.

When the incident light ray emerges from the first focus of a convex lens

b.

The incident light ray is parallel to the principal axis

c.

When the light ray passes through the optical centre of a lens

d.

None of the above

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