71.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) : Soft iron is used in electromagnets. 2. Reason (R) : Soft iron does not retain magnetism permanently.

72.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) : Oxytocin causes vigorous contraction of uterus muscles which initiates labour. 2. Reason (R) : The level of the oxytocin reached is at its maximum just before labour.

73.Consider the following statement regarding biomedication. It involves the use of bacteria and fungi to 1. clean up aquifers 2. clean up toxic dumps 3. clean up oil spills 4. cure bacterial and fungal diseasesOf these, the correct ones are

74.Riveting is done for

75.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 ?Assertion (A) : Detergents can easily remove oil and dirt from soiled graments.Reason (R) : Detergents increase the surface tension of water.