NWCA CET TEST Questions and Answers | Fall 2025/2026 Update | 100% Correct

NWCA CET TEST Questions and Answers | Fall 2025/2026
Update | 100% Correct


QUESTION 1:

Which component of an electrical circuit restricts the flow of current?
A. Resistor
B. Capacitor
C. Inductor
D. Diode

CORRECT ANSWER: A
RATIONALE: The resistor converts electrical energy to heat and limits current in accordance
with Ohm’s Law.



QUESTION 2:

What law states that the current through a conductor is directly proportional to the voltage and
inversely proportional to the resistance?
A. Faraday’s Law
B. Ohm’s Law
C. Kirchhoff’s Current Law
D. Coulomb’s Law

CORRECT ANSWER: B
RATIONALE: Ohm’s Law (V = IR) defines the linear relationship between voltage, current, and
resistance.



QUESTION 3:

Which unit measures electrical capacitance?
A. Ohm (Ω)
B. Farad (F)
C. Henry (H)
D. Ampere (A)

CORRECT ANSWER: B
RATIONALE: Capacitance is the ability to store charge; the SI unit is the farad.

,QUESTION 4:

What happens to the total resistance when resistors are connected in parallel?
A. It increases.
B. It decreases.
C. It remains unchanged.
D. It equals the highest single resistance.

CORRECT ANSWER: B
RATIONALE: Parallel connections provide multiple current paths, lowering total circuit resistance.



QUESTION 5:

Which device converts AC voltage to DC voltage?
A. Amplifier
B. Rectifier
C. Oscillator
D. Transformer

CORRECT ANSWER: B
RATIONALE: A rectifier uses diodes to permit current flow in one direction, converting alternating
to direct current.



QUESTION 6:

The time it takes for a waveform to complete one full cycle is the:
A. Amplitude
B. Frequency
C. Period
D. Phase

CORRECT ANSWER: C
RATIONALE: Period is the reciprocal of frequency; it measures seconds per cycle.



QUESTION 7:

,Which instrument measures electric current directly?
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Oscilloscope

CORRECT ANSWER: B
RATIONALE: An ammeter connects in series to measure current in amperes.



QUESTION 8:

What type of filter passes low frequencies and blocks high frequencies?
A. High-pass filter
B. Low-pass filter
C. Band-pass filter
D. Notch filter

CORRECT ANSWER: B
RATIONALE: A low-pass filter allows slow-changing signals through and attenuates rapid
variations.



QUESTION 9:

Which of the following increases the inductance of a coil?
A. Reducing number of turns
B. Inserting an iron core
C. Decreasing coil diameter
D. Using non-magnetic material

CORRECT ANSWER: B
RATIONALE: A ferromagnetic core concentrates magnetic flux, raising inductance.



QUESTION 10:

In a purely resistive AC circuit, current and voltage are:
A. In phase
B. 90° out of phase

, C. 180° out of phase
D. At zero phase difference

CORRECT ANSWER: A
RATIONALE: With only resistance, current changes instantly with voltage—no phase shift occurs.



QUESTION 11:

Which semiconductor device allows current flow in only one direction?
A. Zener diode
B. PN-junction diode
C. Bipolar transistor
D. SCR

CORRECT ANSWER: B
RATIONALE: A normal PN-junction diode conducts during forward bias and blocks reverse bias.



QUESTION 12:

What is the function of a fuse?
A. Amplify current
B. Store charge
C. Protect circuit from excessive current
D. Steady voltage fluctuations

CORRECT ANSWER: C
RATIONALE: A fuse opens the circuit when current exceeds safe limit, preventing damage.



QUESTION 13:

What does the transformer primarily change?
A. Frequency
B. Voltage level
C. Power factor
D. Current direction

CORRECT ANSWER: B
RATIONALE: A transformer transfers power magnetically and steps voltage up or down.