A multiplexer (MUX) (A) is a parallel to serial converter
(B) is also known as data distributor
(C) can be used as a logic function generator
(D) switch the data from several lines to one line
Choose the correct answer from the options given below:
1
(A), (B), (C) and (D)
2
(A), (B) and (D) only
3
(B), (C) and (D) only
4
(A), (C) and (D) only
Official Solution
Correct Option:
(1)
A multiplexer (MUX) is a digital switch that can perform various functions:
- Parallel to serial conversion: It converts multiple parallel data inputs to a single serial data output.
- Data distributor: It can distribute one of several inputs to the output based on selection.
- Logic function generator: It can be configured to perform different logic operations by appropriately setting its selection lines.
- Switching data: It switches data from multiple lines to a single output line. Thus, all options (A), (B), (C), and (D) are correct. Final Answer:
02
PYQ 2025
medium
nanoelectronicsID: cuet-pg-
Choose the correct statement from the options below:
1
Non-linear distortion is expected to be minimum in Single Side-band Suppressed Carrier (SSB-SC) systems and Amplitude Modulation (AM).
2
The AM system has a suppressed carrier system, which is cheaper than the performance point of view.
3
The receiver of a suppressed carrier system is simpler and cheaper than that of the AM system.
4
The AM system is always easier to analyze and more efficient.
Official Solution
Correct Option:
(3)
Step 1: Understand the receiver design. In an Amplitude Modulation (AM) system, the carrier signal is transmitted along with the modulated signal, requiring more complex receivers. On the other hand, a suppressed carrier system in Single Sideband (SSB) modulation omits the carrier, simplifying the receiver design and reducing the cost.
Step 2: Analyze the correct statement. Thus, the receiver of a suppressed carrier system is simpler and cheaper than that of the AM system. Final Answer:
03
PYQ 2025
medium
nanoelectronicsID: cuet-pg-
The voltage across the inductor for in the given circuit is:
1
2
3
4
Official Solution
Correct Option:
(2)
Step 1: Understand the behavior of an inductor. In an RL circuit, the voltage across the inductor for is governed by the natural response of the inductor, given by the equation: where is the time constant. Step 2: Apply the given values. Here, , and we find that the voltage across the inductor for is: Final Answer:
04
PYQ 2026
medium
nanoelectronicsID: cuet-pg-
In optical fibers, does the core or the cladding have a higher refractive index?
1
Core
2
Cladding
3
Both are equal
4
It varies randomly
Official Solution
Correct Option:
(1)
Concept:
An optical fiber is a flexible transparent fiber used to transmit light signals over long distances using the principle of total internal reflection. Step 1:Structure of optical fiber.
An optical fiber consists of three main parts:
Core
Cladding
Protective coating
Step 2:Refractive index relationship.
For total internal reflection to occur, the refractive index of the core must be slightly higher than that of the cladding. Step 3:Propagation of light.
Because of this difference in refractive index, light entering the core reflects internally at the core–cladding boundary and travels through the fiber with minimal loss. Conclusion:
Therefore, in optical fibers the core has a higher refractive index than the cladding.
05
PYQ 2026
medium
nanoelectronicsID: cuet-pg-
For an ideal op-amp, what is the output voltage if the feedback resistance is equal to the input resistance in an inverting configuration?
1
2
3
4
Official Solution
Correct Option:
(2)
Concept:
In an inverting amplifier configuration of an operational amplifier (op-amp), the input signal is applied to the inverting terminal through an input resistance , while a feedback resistor connects the output to the inverting input. The gain of an ideal inverting amplifier is given by: Step 1:Applying the gain formula.
If the feedback resistance equals the input resistance: then the voltage gain becomes: Step 2:Determining output voltage.
Since the gain is , the output voltage is the negative of the input voltage: Conclusion:
Therefore, when , the output voltage of an ideal inverting op-amp is }.
06
PYQ 2026
medium
nanoelectronicsID: cuet-pg-
In a BJT, what is the primary consequence of the Early effect on the effective base width?
1
The base width increases
2
The base width decreases
3
The base width remains constant
4
The base width becomes zero
Official Solution
Correct Option:
(2)
Concept:
The Early effect (also known as base-width modulation) occurs in a Bipolar Junction Transistor (BJT) when the collector-base junction voltage increases. Step 1:Reverse bias of collector-base junction.
In normal transistor operation, the collector-base junction is reverse biased. Increasing this reverse bias causes the depletion region at the collector-base junction to widen. Step 2:Effect on the base region.
As the depletion region expands into the base region, the effective width of the base decreases. Step 3:Impact on transistor current.
A thinner base region allows more charge carriers to pass from emitter to collector, increasing the collector current slightly even if the base current remains constant. Conclusion:
Therefore, the primary consequence of the Early effect is that the effective base width decreases.
About Electronics - CUET-PG
Electronics is a vital chapter for CUET-PG aspirants. Mastering the concepts covered in this chapter is essential for securing a top rank.
By rigorously practicing the previous year questions associated with this chapter, you can identify high-yield topics, understand the examiner's perspective, and boost your confidence during the actual exam.
Frequently Asked Questions
Why focus on Electronics PYQs?
Analyzing PYQs for this specific chapter reveals the most frequently tested concepts and the typical complexity of questions, allowing you to tailor your study plan efficiently.
How to best use this analysis?
Review the topic breakdown to see which sub-topics within Electronics carry the most weight. Then, tackle the questions iteratively to solidify your understanding.
