Which of the following is an example of a gel? MCQ with Answer and Explanation

Which of the following is an example of a gel?
A. Cheese
B. Smoke
C. Fog
D. Milk
Answer: Option A
Solution (By JKSSB Mock Tests)
A gel is a type of colloid where the dispersed phase is a liquid and the dispersed medium is a solid. Cheese, butter, and jellies are classic examples of gels. Milk is an emulsion (liquid in liquid), while fog and smoke are aerosols.

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Practice More chemistry Questions

Question #1
Detergents are better than soaps because they:
A. Are cheaper
B. Have no environmental impact
C. Work well in hard water
D. Are natural products

Correct Answer: Option C


Explanation:
Synthetic detergents (like alkyl sulfates or sulfonates) form soluble calcium and magnesium salts, so they lather well even in hard water. Soaps form scum. Detergents are usually derived from petrochemicals, can be non-biodegradable if branched, and may cause pollution.

This question belongs to: Science chemistry
Question #2
The process of vulcanization of rubber was invented by:
A. Hermann Staudinger
B. Wallace Carothers
C. Charles Goodyear
D. Leo Baekeland

Correct Answer: Option C


Explanation:
Vulcanization is the chemical process of converting natural rubber or related polymers into more durable materials by adding sulfur or other equivalent curatives. This process was discovered by Charles Goodyear in 1839, revolutionizing the rubber industry by making it less sticky and more temperature-resistant.

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Question #3
According to Charles' law, at constant pressure, the volume of a gas is directly proportional to its:
A. Pressure
B. Density
C. Temperature in Celsius
D. Absolute temperature

Correct Answer: Option D


Explanation:
Charles' law: V ∝ T (Kelvin). So at constant P and n, V/T = constant. If temperature is in Celsius, proportionality is not direct because zero Celsius is not absolute zero. Absolute zero (0 K = -273.15°C) is the theoretical temperature at which volume becomes zero. A graph of V vs T (K) is a straight line through origin.

This question belongs to: Science chemistry