NSO Level 1- Science Olympiad (SOF) Class 10: Questions 774 - 778 of 986

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Question number: 774

» Acids, Bases and Salts

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MCQ▾

Question

Hydrochloric acid was added to Zinc kept in a test tube. A bubble of gas was evolved.

Choices

Choice (4)Response

a.

Bubble of hydrogen gas are formed

b.

A pop sound is obtained

c.

reacts with dilute and liberates hydrogen gas.

d.

All a. , b. and c. are correct

Question number: 775

» Acids, Bases and Salts

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MCQ▾

Question

Given below are certain chemical properties of a substance:

(i) It turns blue litmus red

(ii) It turns red litmus blue

Which one correct for limewater?

Choices

Choice (4)Response

a.

Only (i)

b.

(i) and (ii)

c.

Only (ii)

d.

None of the above

Question number: 776

» Magnetic Effects of Electric Current

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MCQ▾

Question

To convert an AC generator into DC generator

Choices

Choice (4)Response

a.

Slip rings and brushes must be used

b.

Split ring type commutator must be used

c.

A rectangular wire loop has to be used

d.

A stronger magnetic field has to be used a

Question number: 777

» Sources of Energy

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MCQ▾

Question

For making candles, vaseline, ointments, and grease etc. we use

Choices

Choice (4)Response

a.

Ethanol

b.

Lubrication oil

c.

Bitumen

d.

Paraffin Wax

Question number: 778

» Magnetic Effects of Electric Current

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MCQ▾

Question

Which of the following is not correct for electromagnet?

Choices

Choice (4)Response

a.

Magnet formed by putting a soft iron core inside a current carrying solenoid

b.

Permanent magnet

c.

Polarity change when change direction of current

d.

All of the above

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