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

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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
(D) They are not important for heat transfer

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A process in which light rays falls on any material object and these rays bounce back is known as...?

(A) Reflection
(B) Refraction

(C) Diffusion
(D) Absorption

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What happens when two opposite poles of magnets are brought close to each other...?

(A) They repel
(B) They attract

(C) They make an electric current flow
(D) None

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Symptoms of vitamin b7 deficiency are known to ______________....?

(A) Pellagra
(B) Hair Loss

(C) Muscle weakness
(D) Xerophthalmia

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Why the needle of iron swims on water surface when it is kept gently ...?

(A) It will remain under the water, when it will displace more water than its weight
(B) the density of needle is less than that of water

(C) due to surface tension
(D) due to its shape

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The study Of GLANDS is called...?

(A) cardiology
(B) None of these

(C) Endocrinology
(D) Entomology

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The term PVC used in the plastic industry stands for______________...?

(A) Phosphavinyl chloride
(B) Phosphor vanadiu chloride

(C) Polyvinyl chloride
(D) Polyvinyl carbobate

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What is the primary energy currency in a cell...?

(A) Glucose
(B) ATP

(C) NADH
(D) ADP

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Among the following, which is not present in plant cell...?

(A) Cell Membrane
(B) Cytoplasm

(C) Nucleus
(D) Small Vacuole

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A moving object always possesses...?

(A) Potential Energy
(B) Kinetic Energy

(C) Thermal energy
(D) Magnetic energy

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