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611. Given below are two statements, labeled as Assertion (A) and Reason (R). In the context of the two statements, which of the following is correct ? 1. Assertion (A) : Deficiency of iodine in diet may produce Myxoederna, a symptom of hypothyroidism. 2. Reason (R) : Deficiency of iodine reduces the secretion of thyrtropic hormone.
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:
612. 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) : Lead is used for shielding of nuclear radiations.Reason (R) : Lead has a high density.
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:
613. The wavelength of X - rays is of the order of
A. 1 cm
B. 1 m
C. 1 Angstrom
D. 10 micron
Explanation:
614. 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) : If a vertical U - tube contains kerosene in one limb and water in the other, at equilibrium, the level of kerosene is higher than that of water.Reason (R) : The pressures on the two limbs of a U - tube being the same, the height of the liquid level depends on its density; the denser the liquid the lesser the height.
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:
615. 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) : Tadpole larva is carnivorous.Reason (R) : Tadpole larva feeds on plant material.
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:
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