NSO Level 1- Science Olympiad (SOF) Class 10: Questions 678 - 682 of 986

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Question number: 678

» Acids, Bases and Salts

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MCQ▾

Question

A teacher gave two test tube, one containing water and the other containing , to the student and asked them to identify the test tube containing solution. Which of the following can be used for the identification?

Choices

Choice (4) Response

a.

Red litmus

b.

Blue litmus

c.

None of the above

d.

Question does not provide sufficient data or is vague

Question number: 679

» Chemical Reactions and Equation

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MCQ▾

Question

Read the given statements and mark the correct option.

Statement 1: A layer of reddish scale and powder of oxide is formed on the surface of iron metal.

Statement 2: The products contamination or loss of products due to corrosion

Choices

Choice (4) Response

a.

Statements 1 and 2 are true.

b.

Only Statement 2 is true

c.

Statements 1 and 2 are false.

d.

Only Statement 1 is true

Question number: 680

» Sources of Energy

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MCQ▾

Question

Biogas is mainly composed of

Choices

Choice (4) Response

a.

Up to Methane and

b.

Up to Methane and Hydrogen

c.

Up to Methane and Nitrogen

d.

All of the above

Question number: 681

» Chemical Reactions and Equation

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MCQ▾

Question

The reaction represents

Choices

Choice (4) Response

a.

Displacement Reaction

b.

Decomposition

c.

Oxidation

d.

Combination

Question number: 682

» Magnetic Effects of Electric Current

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MCQ▾

Question

Two long parallel conductor a and b, With 1 A and 3A current respectively, are placed at right angles to a meter scale at 2 cm and 6 cm marks. Where would they produce zero magnetic field?

Choices

Choice (4) Response

a.

9 cm

b.

1 cm

c.

5 cm

d.

12 cm