NSO Level 1- Science Olympiad (SOF) Class 10: Questions 776 - 782 of 986

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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

Question number: 779

» Chemical Reactions and Equation

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MCQ▾

Question

The molecules of oxygen for balanced equation is,

Choices

Choice (4) Response

a.

12

b.

6

c.

10

d.

8

Passage

Direction: Read the following passage and answer the question.

Metal is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water.

Metal is used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys.

On Other hand, Non-Metal are a number of pure forms of this element including graphite, diamond, fullerenes and graphene

These Non -metal extracted naturally, as fossil fuels are mostly used as fuels. A small but important fraction is used as a feedstock for the petrochemical industries producing polymers, fibers, paints, solvents and plastics etc.

Question number: 780 (1 of 3 Based on Passage) Show Passage

» Metals and Non - Metals

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MCQ▾

Question

Among the following choices, the non-metal is

Choices

Choice (4) Response

a.

Neon

b.

Helium

c.

Sulphur

d.

Carbon

Question number: 781 (2 of 3 Based on Passage) Show Passage

» Metals and Non - Metals

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MCQ▾

Question

Among the following choices, the metal is

Choices

Choice (4) Response

a.

Potassium

b.

Aluminum

c.

Magnesium

d.

Calcium

Question number: 782 (3 of 3 Based on Passage) Show Passage

» Metals and Non - Metals

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MCQ▾

Question

Among the following, elements that produce sonorous sound are

Choices

Choice (4) Response

a.

Non-metal

b.

Metal

c.

None of the above

d.

Question does not provide sufficient data or is vague