What is the current through the battery in the circuit shown below?

Refer to the circuit diagram given in the figure. which of the following observations are correct?

A. Total resistance of circuit is $6 \Omega$

B. Current in Ammeter is 1 A

C. Potential across $A B$ is 4 Volts.

D. Potential across CD is 4 Volts

E. Total resistance of the circuit is $8 \Omega$.

Choose the correct answer from the options given below:

To obtain the given truth table, following logic gate should be placed at G :

Which of the following circuits represents a forward biased diode?

Choose the correct answer from the options given below: