NSO Level 1- Science Olympiad (SOF) Class 10: Questions 684 - 689 of 986

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Question number: 684

» Light - Reflection and Refraction

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MCQ▾

Question

Which is not correct for concave lens, when the object is in between infinity and centre, the image formed is

Choices

Choice (4)Response

a.

Virtual and Erect

b.

Very small

c.

Both a. and b. are correct

d.

None of the above

Question number: 685

» Magnetic Effects of Electric Current

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MCQ▾

Question

To convert an AC generator into DC generator

Choices

Choice (4)Response

a.

A stronger magnetic field has to be used

b.

A rectangular wire loop has to be used

c.

Slip rings and brushes must be used

d.

Split ring type commutator must be used

Question number: 686

» Sources of Energy

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MCQ▾

Question

The advantages of hydro power plants is

Choices

Choice (4)Response

a.

No environment pollution

b.

Renewable energy source

c.

Construction of dams prevented flooding of rivers, provided water for irrigation

d.

All a. , b. and c. are correct

Question number: 687

» Acids, Bases and Salts

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MCQ▾

Question

If pH of solution is 7, it means that it is

Choices

Choice (4)Response

a.

Weakly acidic

b.

Weakly Basic

c.

Neutral

d.

None of the above

Question number: 688

» Chemical Reactions and Equation

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MCQ▾

Question

Which of the following reactions will not occur?

Choices

Choice (4)Response

a.

b.

c.

d.

None of the above

Question number: 689

» Light - Reflection and Refraction

Edit
MCQ▾

Question

Which of the following is not correct for use of concave lens?

Choices

Choice (4)Response

a.

Microscope

b.

Reflectors

c.

Street Light

d.

Flashlight

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