51.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) : When our body is excited, we breathe at a higher rate. 2. Reason (R) : When oxygen content in arterial blood increases, breathing becomes faster.

52.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 vaccine enables the body to build up its own antibodies.Reason (R) : Active immunity can be acquired only by injecting dead or weakened germs into the body.

53.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) : In a musical contest it can be experienced that one instrument produces sweeter sound than the other.Reason (R) : Quality of musical sound depends only on the pitch and loudness.

54.Which of the following continents has the largest area ?

55.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) : In High Fedelity radio broadcasts frequency modulation (FM) is preferred over amplitude modulation (AM) for transmission purposes.Reason (R) : Atmospheric disturbances affect the amplitude of transmitted broadcast signals.