1. Which statement about units is FALSE?
The answer is (b), 1 volt = 1 newton /coulomb.
The unit of voltage is the volt (V), which is equivalent to joules per coulomb (J/C). The unit of force is the newton (N), which is equivalent to kg⋅m/s². Therefore, 1 volt = 1 J/C ≠ 1 N/C.
The other statements are all true.
2. Which statement is FALSE?
The answer is (c), By the passive sign convention, current enters through the positive polarity of the voltage.
The passive sign convention states that current flows from the positive terminal of a voltage source to the negative terminal. Therefore, current enters through the negative polarity of the voltage.
The other statements are all true.
3. Which statement is FALSE?
The answer is (b), A nonlinear resistor does not obey Ohm’s law.
Ohm's law states that the current through a resistor is directly proportional to the voltage across the resistor. A nonlinear resistor does not obey this law, and the current through the resistor is not directly proportional to the voltage across the resistor.
The other statements are all true.
4. Which statement is FALSE?
The answer is (a), If there is a voltage source in the circuit, then we have to introduce supernode for nodal analysis.
Supernodes are not necessary for nodal analysis if there are no voltage sources in the circuit. However, supernodes can be used to simplify the nodal analysis of circuits with voltage sources.
The other statements are all true.
5. Which statement is FALSE?
The answer is (d), When a load RL is collected to a Thevenin equivalent circuit, then the power delivered to RL increases first and then decreases as RL increases from 0 to infinite.
The power delivered to RL by a Thevenin equivalent circuit is constant for all values of RL. This is because the Thevenin equivalent circuit is a linear circuit, and the power delivered to a linear circuit is constant for all values of the load.
The other statements are all true.
6. Which statement is TRUE?
The answers are (f) and (h).
The open loop gain of an operational amplifier depends on the feedback resistor Rf connected between the inverting input and output.
In an ideal op amp, the voltage across the input terminals is equal to zero.
The other statements are false.