NSO Level 1- Science Olympiad (SOF) Class 10: Questions 846 - 850 of 986

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Question number: 846

» Magnetic Effects of Electric Current

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MCQ▾

Question

In which of the following device, electric motor is not used?

Choices

Choice (4) Response

a.

Washing machines

b.

Water-pumps

c.

Wind turbine

d.

Refrigerators

Question number: 847

» Chemical Reactions and Equation

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MCQ▾

Question

Read the given statements and mark the correct option.

Statement 1: According to the law of conservation of mass, when a chemical reaction occurs, the mass of the products should be equal to the mass of the reactants.

Statement 2: is balance equation.

Choices

Choice (4) Response

a.

Statements 1 and 2 are false

b.

Only Statement 1 is true

c.

Statements 1 and 2 are true

d.

Only Statement 2 is true

Question number: 848

» Sources of Energy

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MCQ▾

Question

Disadvantage/ (s) of wind energy is/are

Choices

Choice (4) Response

a.

High initial cost

b.

Need large area

c.

Difficulty in getting regular wind speed of

d.

All a. , b. and c. are correct

Question number: 849

» Chemical Reactions and Equation

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MCQ▾

Question

Students added to a test tube containing copper sulphate. Which of the following observation are correct?

(i) Blue solution becomes colorless.

(ii) Reddish brow

(iii) No change observed

(iv)

Choices

Choice (4) Response

a.

(i) & (ii)

b.

(i) (ii) & (iv)

c.

(i) (ii) & (iii)

d.

(i) (iv) & (iii)

Question number: 850

» Sources of Energy

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MCQ▾

Question

The energy available due to the temperature difference between the deeper levels and surface of an ocean is known as

Choices

Choice (4) Response

a.

Sea wave energy

b.

Energy from Nuclear deuterium of oceans

c.

Ocean thermal energy

d.

Ocean tidal energy