ISRO 2023 Quiz 14

The 6V zener diode is shown in fig. It has zero zener resistance and a knee current of 5 m. 

The minimum value of R so that the voltage across it does not fall below 6V is

For the circuit shown in fig, V₀ is equal to

Find the value of R_a such that

In the following circuit, the ammeter reads 13.46 A when it is of MI type. What would be the ammeter reading if it is of MC type

In a rectangular parallelepiped, the sum of length, breadth and height is calculated as 20 cm. if the length of the body diagonal is 16 cm, then the total surface area will be _____cm².