NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1972 - 1977 of 2000

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Question number: 1972

» Chemistry » Structure of the Atom

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Question

What is the formula to find maximum number of electrons in the main shell of an atom?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1973

» Chemistry » Atoms & Molecules

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Question

“In a chemical reaction, the sum of the mass of reactants and product remains constant” This statement known as?

Choices

Choice (4)Response

a.

Law of multiple proportion

b.

Law of definite proportion

c.

Law of conservation of mass

d.

None of the above

Question number: 1974

» Chemistry » The Nature of Matter

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Question

An emulsifier is a substance which?

Choices

Choice (4)Response

a.

Purifies the emulsion

b.

Helps in the dispersion of liquid in liquid

c.

Stabilises the emulsion

d.

Coagulator the emulsion

Question number: 1975

» Chemistry » Matter

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Question

Which of the following statement is false?

Choices

Choice (4)Response

a.

All forms of matter have mass

b.

Matter can be living or non-living

c.

All forms of matter have same colour

d.

All forms of matter have volume

Question number: 1976

» Chemistry » Atoms & Molecules

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Question

Generally sulphur molecule exists as if you have of sulphur, then calculate moles present in it?

Choices

Choice (4)Response

a.

b.

c.

d.

Question number: 1977

» Chemistry » Atoms & Molecules

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MCQ▾

Question

of hydrocarbon on combustion with of oxygen produce of and of . The data illustrate the law of?

Choices

Choice (4)Response

a.

Conservation of mass

b.

Reciprocal proportions

c.

Multiple proportions

d.

Constant proportions

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