Science Questions with Answers

Q.25 When blood is forced into the artery, wave-like expansion takes place is called:

(A) Heartbeat

(B) Pulse

(C) Flow

(D) Ticking

Q.26 Which of the following is used as a lubricant?

(A) Graphite

(B) Silica

(C) Iron Oxide

(D) Diamond

Q.27 The inert gas which is substituted for nitrogen in the air used by deep-sea divers for breathing is

(A) Argon

(B) Xenon

(C) Helium

(D) Krypton

Q.28 The gases used in different types of welding would include

(A) oxygen and hydrogen

(B) oxygen, hydrogen, acetylene, and nitrogen

(C) oxygen, acetylene, and argon

(D) oxygen and acetylene

Basic Science Questions

Q.29 The property of a substance to absorb moisture from the air on exposure is called

(A) osmosis

(B) deliquescence

(C) efflorescence

(D) desiccation

Q.30 In which of the following activities silicon carbide is used?

(A) Making cement and glass

(B) Disinfecting water of ponds

(C) cutting very hard substances

(D) Making casts for statues

Q.31 The average salinity of sea water is

(A) 3%

(B) 3.5%

(C) 2.5%

(D) 2%

Q.32 When an iron nail gets rusted, iron oxide is formed

(A) without any change in the weight of the nail

(B) with a decrease in the weight of the nail

(C) with an increase in the weight of the nail

(D) without any change in color or weight of the nail

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