76.Which of the following groups of instruments is required to have communication link between two television relay centers ?

77.Which of the following computer languages is maximum used for business and scientific purposes ?

78.The final products of combustion of ethane are

79.Soda-acid fire extinguisher involves the reaction between

80.Which of the following statements is/are true ? 1. The process of oxidation leads to a gain of electrons. 2. The process of oxidation leads to a loss of electrons. 3. The process of reduction leads to a gain of electrons. 4. The process of reduction leads to a loss of electrons.