Physical Science

Correct Answer: B

Selenium is of the following non-metals is not a poor conductor of electricity. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: A

Which one of the following represents a chemical change Sublimation of iodine. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: D

Glycerine is product is obtained in the manufacture of soap from oils:. This description follows from the defining characteristics and established facts associated with the subject.

Correct Answer: B

Fission reaction is type of reaction produces the most harmful radiation. The result follows from how light is reflected, refracted, focused, or distributed across the electromagnetic spectrum.

Correct Answer: C

Why are soft drink made with chilled water rather than water at room temperature: Chilled water attracts more carbon dioxide. The stated result follows from the relevant physical relationship between force, matter, motion, or energy.

Correct Answer: B

Why normal rain is slightly acidic: carbon dioxide and water in clouds react to form carbonic acid. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: C

With the rise in temperature, metals conductivity Decreases. Its composition and chemical or physical behavior give it the stated classification or property.

Correct Answer: B

Laughing gas is nitrous oxide, chemically written as N2O. It has mild anaesthetic and analgesic effects and historically received the nickname because inhalation can produce euphoria or laughter.

Correct Answer: C

Carbon dioxide is a major greenhouse gas because it absorbs outgoing infrared radiation from Earth's surface. Increased CO2 from burning fossil fuels strengthens the greenhouse effect and contributes to global warming.

Correct Answer: B

Sulphur dioxide damages iron and steel structures because it contributes to acid rain and corrosive acidic conditions. In the presence of moisture, acidic pollutants accelerate rusting and deterioration of metals.

Correct Answer: C

Nitrogen is made usable for plants mainly after conversion into ammonia and then other nitrogen compounds through the nitrogen cycle. Nitrogen-fixing bacteria convert atmospheric nitrogen into ammonia, which can later become nitrates in soil.

Correct Answer: A

Yeast is used in bread-making because it ferments sugars and produces carbon dioxide gas. The CO2 bubbles make the dough rise and create a soft, porous texture after baking.

Correct Answer: B

Specific gravety of a liquid is the correct answer because it matches the fact or concept tested by this question.

Correct Answer: A

Metalloid is the correct answer because it matches the fact or concept tested by this question.

Correct Answer: A

Silicon is the relevant answer because it is directly tied to the fact, definition or concept named in the stem. For study purposes, focus on the relationship between the stem and the selected term, date, place or person so the item is learned as knowledge rather than memorised as a letter choice.

Correct Answer: D

Carbon dioxide is the correct answer because it matches the fact or concept tested by this question.

Correct Answer: C

Hydrogen is the ranked fact being tested in this item. Superlative MCQs depend on the comparison criterion—such as area, population, height, length, chronology or institutional seniority—so the selected option must match that criterion.

Correct Answer: C

Nitrous Oxide (N2O) is commonly known as laughing gas due to the euphoric effect it can produce when inhaled.

Correct Answer: B

Sulphur dioxide pollution reacts with the marble surface, forming yellowish deposits that discolor the Taj Mahal.

Correct Answer: A

An Anemometer measures Wind Speed.