NEET (UG)

Practice Test 1 — Chemistry in Everyday Life

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct & Statement-based)

Question 1

The molecular targets of most drugs are enzymes and:

Solution: Enzymes and receptors.

Question 2

A drug that blocks the natural messenger at a receptor is a/an:

Solution: Antagonists block the receptor.

Question 3

Aspirin is a:

Solution: Non-narcotic, also antipyretic/anti-inflammatory.

Question 4

Statements: (I) Antiseptics are applied to living tissue. (II) Disinfectants are used on non-living surfaces. Which is/are correct?

Solution: Both are correct.

Question 5

Which sweetener is unstable at cooking temperature?

Solution: Aspartame decomposes on heating.

Question 6

Sodium benzoate is used as a:

Solution: A common food preservative.

Question 7

Soap fails in hard water because it forms an insoluble:

Solution: Ca/Mg ions give curdy scum.

Question 8

Detergents are usually the sodium salts of:

Solution: Sulphonate salts — soluble Ca/Mg salts.

Section B — Assertion & Reason

Question 9

A: Detergents clean effectively in hard water.
R: The calcium and magnesium salts of detergents are soluble in water.

Solution: Soluble Ca/Mg salts mean no scum forms, so detergents work in hard water — R explains A.

Question 10

A: Aspartame is used only in cold food and soft drinks.
R: Aspartame is unstable at cooking temperatures.

Solution: Its heat-instability is exactly why it is limited to cold uses — R explains A.

Question 11

A: Phenol can act as both an antiseptic and a disinfectant.
R: Phenol behaves as an antiseptic at low concentration and as a disinfectant at higher concentration.

Solution: The concentration difference is exactly what changes its role — R explains A.

Question 12

A: Straight-chain detergents are preferred over branched ones for environmental reasons.
R: Straight-chain detergents are readily biodegradable, whereas branched ones resist breakdown.

Solution: Straight chains break down naturally, so they pollute less — R explains A.