Electronic Science - Online Test
Q1. The equivalent capacitance of the input loop of the circuit shown is
Answer : Option A
Explaination / Solution:
No Explaination.
Q2. A parallel plate capacitor of capacity 100 μF is charged by a battery of 50 volts. The battery remains connected and if the plates of the capacitor are brought closer so that the distance between them becomes half the original distance, the additional energy given by the battery to the capacitor in joules is:
Answer : Option C
Explaination / Solution:
Initial energy of the capacitor. When the plates are kept at half the original distance, the new capacitance
Final energy Increase in energy = additional energy given by the battery=
Final energy Increase in energy = additional energy given by the battery=
Q3. In IC technology, dry oxidation (using dry oxygen) as compared to wet oxidation (using steam or water vapor) produces
Answer : Option D
Explaination / Solution:
In IC technology, dry oxidation as compared to wet oxidation produces superior quality oxide with a lower growth rate
Q4. 
In the following circuit, the comparators output is logic “1” if V1 > V2 and is logic "0" otherwise. The D/A conversion is done as per the relation
Volts, where b3 (MSB), b1,b2 and b0 (LSB) are the counter outputs. The counter starts from the clear state.
Volts, where b3 (MSB), b1,b2 and b0 (LSB) are the counter outputs. The counter starts from the clear state.The stable reading of the LED displays is
Answer : Option D
Explaination / Solution:
and when VADC = 6.5 V (at 1101), the output of AND is zero and the counter stops. The stable output of LED display is 13.
Q5. The RC circuit shown in the figure is
Answer : Option C
Explaination / Solution:
At ω⟶3, capacitor acts as short circuited and circuit acts as shown in fig below
At ω⟶0, capacitor acts as open circuited and circuit look like as shown in fig
below
So frequency response of the circuit is as shown in fig and circuit is a Band pass
filter.
Q6. 64 water drops having equal charges combine to form one bigger drop. The capacitance of the bigger drop, as compared to that of smaller drop will be
Answer : Option D
Explaination / Solution:
Capacitance of the small drop of radius r and that of the big drop of radius R is The volume of 64 small drops = volume of 1 big dropThe ratio
Q7.
In a MOSFET operating in the saturation region, the channel length modulation effect causes
Answer : Option D
Explaination / Solution:
In a MOSFET operating in the saturation region, the channel length modulation effect causes a decrease in output resistance.
Q8.
In the following circuit, the comparators output is logic “1” if V1 > V2 and is logic "0" otherwise. The D/A conversion is done as per the relationVolts, where b3 (MSB), b1,b2 and b0 (LSB) are the counter outputs. The counter starts from the clear state.
Volts, where b3 (MSB), b1,b2 and b0 (LSB) are the counter outputs. The counter starts from the clear state.The magnitude of the error between VDAC and Vin at steady state in volts is
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. Two series resonant filters are as shown in the figure. Let the 3-dB bandwidth
of Filter 1 be B1 and that of Filter 2 be B2. the value B1/B2 is
Answer : Option D
Explaination / Solution:
Q10. Four capacitors, each of capacitance 50 are connected as shown in the figure. If the voltmeter reads 100 V, the charge on each capacitor is
Answer : Option D
Explaination / Solution:
PD across each 50μF capacitor is 100 V ( reading of the voltmeter.)
