The IIT Madras BS Electronic Systems Thinking and Circuits (ESTC) Quiz 1 paper sat on 15 Mar 2026, in the January 2026 term: 24 questions for 43 marks in 120 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.
Instructions: ● Numerical answers need to be rounded off to two decimal places. ● Make sure that the answers are entered as per the specified units in the questions.
Instructions has been mentioned above.
This Instructions is just for a reference & not for an evaluation.
Correct answer
Instructions has been mentioned above.
A 3 mH inductor carrying a current of 2 mA will store 6 µJ of energy.
True
False
Correct answer
False
The energy that can be stored in a 8 V car battery rated at 550 Ahr is 4.4 units.
True
False
Correct answer
True
In a circuit with two resistors R1 and R2 that are connected in parallel carry currents of 12 mA and 3 mA, respectively. Then the ratio of their resistances is R1: R2 = 1:4.
True
False
Correct answer
True
In a given signal, if the third harmonic frequency is 5 Hz, then the fundamental frequency is 15 Hz.
True
False
Correct answer
False
The following figure corresponds to the voltage-current characteristics of an ideal current source of value 5 A.
True
False
Correct answer
True
The equivalent resistance (in kΩ) across A and B in the given circuit is _______kΩ.
10
2.5
15
6.67
Correct answer
10
The frequency (in rad/s) of the given waveform is ________ rad/s.
251.33
40
0.025
20
Correct answer
251.33
The magnitude of voltage (in V) across the terminals ‘a’ and ‘b’ in the figure is ________V.
2.5
3.5
1.75
3
Correct answer
3.5
The plot below shows the current flowing through a 30 Ω resistor. The average power (in W) dissipated by the resistor is ______ W.
500
1000
100
200
Correct answer
1000
The potential difference VAB (in V) between the terminals A and B for the circuit shown below is ___________V.
0
13
11
5
Correct answer
11
A kitchen uses the following appliances while preparing a meal:
Electricity costs Rs 10 per kWh. The electricity charge (in Rs) for preparing the meal is Rs. ________
5350
35.3
3530
53.5
Correct answer
53.5
For the circuit shown below, assume that the initial charge in the capacitors is zero. The charge (in µC) stored in the capacitor labelled C is ________µC.
25
30
20
50
Correct answer
50
The voltage V in the figure is equal to ______ V.
3
-3
5
None of these
Correct answer
3
Which of the following circuits is not practical?
Both II and III
Both I and II
I
I, II, and IV
Correct answer
I
With (v(t)=Asin(ωt+ϕ)), where A, ω, and ϕ are constants, and the reference waveform featuring ϕ=0 (rad), examine the sinusoidal waveforms as shown below. Choose the appropriate waveform(s) concerning the reference waveform.
Sin A = A sin(ωt−30 ) and Sin C = A sin(ωt+90 )
Sin A = A sin(ωt+30 ) and Sin C = A sin(ωt+90 )
Sin A = A sin(ωt−30 ) and Sin C = A sin(ωt-90 )
Sin A = A sin(ωt+30 ) and Sin C = A sin(ωt-90 )
Correct answer
Sin A = A sin(ωt+30 ) and Sin C = A sin(ωt-90 )
For the circuit shown below, the resistance R (in Ω) is _______Ω.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
The value of i (in mA) is _______ mA.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
The value of i (in mA) is _______ mA.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
The value of i (in mA) is _______ mA.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
The value of V - V is _______ V.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
The value of I (in mA) is _______ mA.
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
A written answer, not marked automatically.
Consider the circuit given below and answer the given sub-questions:
A written answer, not marked automatically.
