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506. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : Whale is an aquatic mammal.Reason (R) : They have a very thin layer of fat in subdermis.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
507. Microphone is a device in which
A. sound waves are directly transmitted.
B. electrical energy is converted into sound waves directly.
C. sound waves are converted into electrical energy and then reconverted into sound affter transmission.
D. amplification is not required at all.
Explanation:
508. From Which of the following sources can the purest form of water be obtained ?
A. Rain water
B. River water
C. Well water
D. Mineral water
Explanation:
509. Given below are two statements, labelled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ?Assertion (A) : The main source of energy in most of the Indian diets is carbohydrate.Reason (R) : Carbohydrates provide more energy per gram than proteins and fats.
A. Both A and R are true and R is the correct explanation of A.
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false but R is true.
Explanation:
510. Angora wool is obtained from a breed of
A. goat
B. rabbit
C. sheep
D. cat
Explanation:
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