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Question (1)

QN002671

Which of the following best describes a mixture?

(A) A substance made of only one kind of particle
(B) Two or more substances chemically combined
(C) Two or more substances mixed without chemical reaction
(D) A substance that cannot be separated physically

Correct Answer: C

Explanation:

In a mixture, substances are mixed physically and do not react chemically.

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Question (2)

QN002672

Which of the following is a non-uniform mixture?

(A) Sugar solution
(B) Air
(C) Sprout salad
(D) Vinegar

Correct Answer: C

Explanation:

Components of sprout salad are visible separately.

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Question (3)

QN002673

In a uniform mixture, the components are

(A) visible separately
(B) unevenly distributed
(C) chemically combined
(D) evenly distributed

Correct Answer: D

Explanation:

Uniform mixtures have evenly distributed components.

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Question (4)

QN002674

Which of the following is a uniform mixture?

(A) Sand and water
(B) Oil and water
(C) Sugar dissolved in water
(D) Fruit salad

Correct Answer: C

Explanation:

Sugar spreads evenly throughout water.

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Question (5)

QN002675

The substances that make up a mixture are called

(A) molecules
(B) compounds
(C) components
(D) atoms

Correct Answer: C

Explanation:

Individual substances in a mixture are called components.

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Question (6)

QN002676

Which of the following mixtures has components visible to the naked eye?

(A) Lemonade
(B) Air
(C) Poha
(D) Vinegar

Correct Answer: C

Explanation:

Different ingredients in poha can be seen clearly.

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Question (7)

QN002677

A student mixes green gram, onion, tomato, and chickpeas in a bowl. The mixture formed is

(A) uniform
(B) non-uniform
(C) pure substance
(D) compound

Correct Answer: B

Explanation:

The components are visible separately, so it is non-uniform.

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Question (8)

QN002678

Which statement is correct about mixtures?

(A) Components lose their properties
(B) Components react chemically
(C) Components retain their properties
(D) Components form new substances

Correct Answer: C

Explanation:

Components of mixtures retain their individual properties.

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Question (9)

QN002679

Air is called a mixture because

(A) it contains only gases
(B) its gases are chemically combined
(C) it contains many substances mixed together
(D) it contains oxygen only

Correct Answer: C

Explanation:

Air contains nitrogen, oxygen, carbon dioxide, water vapour, etc.

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Question (10)

QN002680

Nitrogen constitutes nearly what percentage of air?

(A) 21%
(B) 50%
(C) 78%
(D) 90%

Correct Answer: C

Explanation:

Nitrogen makes up about 78% of air.

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Question (1)

Which of the following best describes a mixture?

Explanation:

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Question (2)

Which of the following is a non-uniform mixture?

Explanation:

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Question (3)

In a uniform mixture, the components are

Explanation:

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Question (4)

Which of the following is a uniform mixture?

Explanation:

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Question (5)

The substances that make up a mixture are called

Explanation:

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Question (6)

Which of the following mixtures has components visible to the naked eye?

Explanation:

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Question (7)

A student mixes green gram, onion, tomato, and chickpeas in a bowl. The mixture formed is

Explanation:

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Question (8)

Which statement is correct about mixtures?

Explanation:

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Question (9)

Air is called a mixture because

Explanation:

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Question (10)

Nitrogen constitutes nearly what percentage of air?

Explanation:

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