MCQs

Q331: Which gas is used to extract energy from food in respiration?

• A) CO2
• B) N2
• C) O2

Q332: Sugar dissolution in water, actually represents solute and solvent combination of _____?

• A) Solid solid solution
• B) Liquid liquid solution
• C) Solid liquid solution

Q333: The fog in winter is caused due to _____?

• A) Suspended (condensation) water
• B) Smoke
• C) All of these

Q334: When light changes in direction when entering one transparent medium to another is known as?

• A) Reflection
• B) Diffraction
• C) Refraction

Q335: Objects that gives out light of their own are said to be?

• A) Luminous
• B) Non-luminous
• C) Reflective

Q336: A thermos flask keeps things close to their original temperature by reducing ____?

• A) Conduction
• B) Convection
• C) All of these

Q337: The cooling fins at the back of refrigerator are made of black and rough surface because ____?

• A) They are good conductors of heat
• B) They are good radiators of heat
• C) They are good insulators of heat

Q338: During the daytime, the air above the land gets heated up its density ____?

• A) Increase
• B) Decrease
• C) Remain same

Q339: Heat is a form of energy associated with ____?

• A) Molecular Motion
• B) Atomic Stability
• C) Nuclear Reaction

Q340: Animals that eat only plants are known as?

• A) Carnivores
• B) Omnivores
• C) Herbivores