NSO Level 1- Science Olympiad (SOF) Class 10: Questions 634 - 638 of 986

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Question number: 634

» Sources of Energy

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MCQ▾

Question

Fossil fuels are usually

Choices

Choice (4)Response

a.

Ethanol

b.

Hydrocarbons

c.

Mercury

d.

Potassium nitrate

Question number: 635

» Acids, Bases and Salts

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MCQ▾

Question

On opening the soda water bottle, the dissolved comes out. Would the pH of the solution increase or decrease as the gas comes out?

Choices

Choice (4)Response

a.

Carbonic acid decreases and pH increases

b.

Carbonic acid increases and pH decreases

c.

Carbonic acid and pH both are decreases

d.

None of the above

Question number: 636

» Chemical Reactions and Equation

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MCQ▾

Question

The molecules of oxygen and hydrogen for balanced equation is,

Choices

Choice (4)Response

a.

12,24

b.

, 12

c.

10,20

d.

8,16

Question number: 637

» Magnetic Effects of Electric Current

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MCQ▾

Question

Choose the incorrect statement.

Choices

Choice (4)Response

a.

Fleming’s right hand rule is a simple rule to know the direction of induced current

b.

The right hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors

c.

The difference between the direct and alternating currents is that the direct current always flows in 1 direction, where as the alternating current reverses its direction periodically

d.

In India, the AC changes direction after every second

Question number: 638

» Carbon and Its Componds

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MCQ▾

Question

Image shown the reaction of Ethanol with sodium

Image Shown the Reaction of Ethanol with Sodium

In this reaction which of the following is evolved?

Choices

Choice (4)Response

a.

And Water

b.

Water

c.

Hydrogen

d.

Developed by: