General Science Jkssb Chemistry Set 1 Mcqs (504 MCQs) | JKSSB & SSC Quiz

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jkssb chemistry set 1 mcqs

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Practice Questions

504 Total
Question 81 Discuss
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Which chemical compound is commonly utilised as a preservative in beverages and food products to maintain freshness?

A
Carboxylic acid
B
Carbolic acid
C
Benzoic acid
D
Carbamic acid

Answer & Explanation

Correct Option: C

Benzoic acid and its salts are widely used as food preservatives because they inhibit the growth of mold, yeast, and some bacteria.
Question 82 Discuss
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Select the INCORRECT statement from the following.

A
Evaporation is a surface phenomenon.
B
Both boiling and evaporation are bulk phenomena.
C
Boiling is a bulk phenomenon.
D
Evaporation causes cooling.

Answer & Explanation

Correct Option: B

Evaporation is a surface phenomenon occurring at any temperature, while boiling is a bulk phenomenon that occurs at a specific boiling point.
Question 83 Discuss
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How does salt contribute to the preservation of food?

A
By acting as an antioxidant.
B
By inhibiting the growth of microorganisms through osmosis.
C
By reducing the pH of the food.
D
By promoting the Maillard reaction.

Answer & Explanation

Correct Option: B

Salt draws water out of microbial cells through osmosis, dehydrating and killing them or preventing their reproduction.
Question 84 Discuss
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Suspended solids in water can increase the haziness of the water. Which of the following represents the measurement of haziness of water?

A
Solubility
B
Turbidity
C
Salinity
D
Viscosity

Answer & Explanation

Correct Option: B

Turbidity is the measure of relative clarity of a liquid, influenced by the presence of suspended particles like clay or organic matter.
Question 85 Discuss
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At what temperature are the numerical values on the Celsius and Fahrenheit scales identical?

A
32 degrees
B
-32 degrees
C
40 degrees
D
-40 degrees

Answer & Explanation

Correct Option: D

The formula F = (9/5)C + 32 yields -40 for both scales when solved for the point where they are equal.
Question 86 Discuss
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Which gas is released when you combine vinegar and baking soda in a balloon, causing it to inflate?

A
Carbon dioxide
B
Oxygen
C
Nitrogen
D
Hydrogen

Answer & Explanation

Correct Option: A

The reaction between acetic acid (vinegar) and sodium bicarbonate (baking soda) produces carbon dioxide gas as a byproduct.
Question 87 Discuss
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Select the correct order of the following metals in terms of their increasing reactivities.

A
K,Cu,Mg and Au
B
Au, Mg,Cu and K
C
K,Mg,Cu and Au
D
Au,Cu,Mg and K

Answer & Explanation

Correct Option: D

Reactivity increases from noble metals like Gold (Au) up to highly reactive alkali metals like Potassium (K).
Question 88 Discuss
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In the context of water pollution, what does a high Biological Oxygen Demand (BOD) usually indicate?

A
The random changes in pH values
B
Increasing amount of carbon dioxide
C
Changes in turbidity
D
The water is heavily polluted with organic matter

Answer & Explanation

Correct Option: D

A high BOD means more oxygen is being consumed by microorganisms to break down organic pollutants, reducing oxygen available for aquatic life.
Question 89 Discuss
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Select the correct order of processes used for water purification in waterworks. 1. Filtration 2. Chlorination 3. Suspended impurity sedimentation 4. Solid impurity sedimentation

A
2-1-4-3
B
1-2-3-4
C
4-3-2-1
D
4-3-1-2

Answer & Explanation

Correct Option: D

Water treatment typically follows the sequence of settling solids, removing smaller particles via filtration, and finally disinfecting with chlorine.
Question 90 Discuss
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Ortho-sulphobenzimide is one of the artificial sweeteners. It is also known as .

A
Aspartame
B
Sucralose
C
Saccharin
D
Alitame

Answer & Explanation

Correct Option: C

Ortho-sulphobenzimide is commonly known as saccharin, which was discovered in 1879 by Constantin Fahlberg. It is one of the oldest artificial sweeteners and is significantly sweeter than sucrose.
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