46.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) : Copper rods are preferred to iron rods for making lightning conductors.Reason (R) : Copper is a better conductor of electricity.

47.Which of the following countries has the largest area in the world ?

48.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) : A tennis ball will bounce higher in Calcutta than it would in Shimla. 2. Reason (R) : The downward pull due to gravity is less and air is more rarified in Shimla than in Calcutta.

49.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) : A lock of Einstens hair, if scientists could locate it and extract its DNA, could help in producing another Einstein.Reason (R) : The DNA extracted from the cell of an embryo at an early stage of development, can be transferred to individual eggs which in turn can be implanted into the uterus of a surrogate mother to give birth to an identical off-spring.

50.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) : Urine of some insects and birds contains uric acid.Reason (R) : Uric acid is more poisonous than urea.