MCQs

Q251: A Barometer is device used to measure ______?

• A) Humidity
• B) Atmospheric Pressure
• C) Room Temperature

Q252: The specific gravity of water is taken as?

• A) 1
• B) 2
• C) 3

Q253: Urea fertilizer contains ______% nitrogen.

• A) 46%
• B) 36%
• C) 26%

Q254: Oxidation is a chemical reaction involving the __________?

• A) Gain of Electrons
• B) Loss of Electrons
• C) Gain of Protons

Q255: The hardest substance in the world is known as?

• A) Diamond
• B) Copper
• C) Iron

Q256: The reaction which releases or gives off heat is called?

• A) Exothermic Reaction
• B) Endothermic Reaction
• C) Oxidation Reaction

Q257: What is standard temperature and pressure (STP)?

• A) 278k
• B) 245 k
• C) 273 k

Q258: What is the chemical formula of limestone?

• A) CaCO₃
• B) CaO
• C) Ca(OH)₂

Q259: A wire of initial length L and radius r is stretched by a length l, another wire of same material but with initial length 2 L and radius 2r is stretched by length 2l. the ratio of the stored elastic energy per unit volume in the first and second wire is _____?

• A) 2:1
• B) 1:2
• C) 1:1

Q260: When combustion is completed, we get?

• A) CO
• B) CO₂
• C) O₂