Beta rays are composed of: MCQ with Answer and Explanation

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Beta rays are composed of:

A. Electromagnetic waves

B. Neutrons

C. High-speed electrons

D. Positively charged helium nuclei

Answer: Option C

Solution (By JKSSB Mock Tests)

Beta rays (β) consist of high-speed, high-energy electrons (β⁻) or positrons (β⁺) emitted from the nucleus during radioactive decay. In standard beta decay, a neutron converts into a proton and an electron, and the electron is ejected from the nucleus.

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Question #1

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Terylene is also known as:

A. Nylon

B. Polyester

C. Polyacrylonitrile

D. Polyurethane

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Correct Answer: Option B

Explanation:
Terylene is a synthetic fiber belonging to the polyester family. Chemically, it is polyethylene terephthalate (PET), formed by the condensation polymerization of ethylene glycol and terephthalic acid. It is widely used in textiles, plastic bottles, and recording tapes.

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Question #2

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The acid present in ant sting is:

A. Formic acid

B. Citric acid

C. Acetic acid

D. Lactic acid

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Correct Answer: Option A

Explanation:
Ant sting contains formic acid (methanoic acid, HCOOH), causing irritation. Nettle sting also contains formic acid. To neutralize, apply a base like baking soda. Acetic acid is in vinegar, citric acid in citrus fruits, lactic acid in sour milk and muscles. Formic acid is the simplest carboxylic acid.

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Question #3

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Hard water can be softened by ion exchange method. The resin exchanges ________ for Ca²⁺ and Mg²⁺ ions.

A. Cl⁻

B. H⁺

C. Na⁺

D. OH⁻

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Correct Answer: Option C

Explanation:
Cation exchange resins contain Na⁺ ions which are replaced by Ca²⁺/Mg²⁺, softening the water. Anion exchange can also be used for deionization. Washing soda precipitates Ca/Mg.

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