56.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) : Velocity of sound in air is independent of the pressure of air.Reason (R) : When pressure changes, density of air changes in such a way that the ratio of pressure and density remains unchanged.

57.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) : Ammonium sulphate and lime should not be added together in a fertiliser mixture.Reason (R) : Reactive basic materials like lime react with ammonium sulphate liberating ammonia which is lost from the fertilizer mixture.

58.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) : Cadmium rods are used as control rods in nuclear reactors.Reason (R) : Cadmium has a high tendency to absorb free neutrons.

59.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 person with blood type O is considered a universal recipient.Reason (R) : Type O blood does not contain any antigens.

60.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) : Protein malnutrition is widely prevalent in India among cereal consuming population.Reason (R) : The cereal consuming population consumes a little protein and that too of inferior quality.