Electronic Science - Online Test
Q1. A capacitor is made with a polymeric dielectric having an εr of 2.26 and a
dielectric breakdown strength of 50kV/cm. The permittivity of free space is
8.85pF/m. If the rectangular plates of the capacitor have a width of 20cm and a
length of 40cm, then the maximum electric charge in the capacitor is
Answer : Option C
Explaination / Solution:
Q2. A clipper circuit is shown below.
Assuming forward voltage drops of the diodes to be 0.7V, the input-output transfer characteristics of the circuit is
Answer : Option C
Explaination / Solution:
Q3. Lorentz Force generally refers to
Answer : Option C
Explaination / Solution:
A moving charge experiences a force in a magnetic field called magnetic Lorentz force given by
Q4. The simplified SOP (Sum of Product) form of the Boolean expression
is
is
Answer : Option B
Explaination / Solution:
Q5. In the sum of products function f (X, Y, Z) = ∑(2, 3, 4, 5), the prime implicants are
Answer : Option A
Explaination / Solution:
Q6. In the circuit shown below, the current through the inductor is
Answer : Option C
Explaination / Solution:
Q7. In a potentiometer experiment, for measuring internal resistance of a cell, the balance point has been obtained on the fourth wire. The balance point can be shifted to fifth wire by
Answer : Option B
Explaination / Solution:
If the current due to the auxillary battery is decreased, the potential gradient will be decreases, so the balancing length increases.
Thus null point will move to fifth wire.
Q8. In which case of comparing solenoid and bar magnet there is no exact similarity?
Answer : Option B
Explaination / Solution:
No Explaination.
Q9. In a pure, or intrinsic, semiconductor, valence band holes and conduction-band electrons are always present
Answer : Option A
Explaination / Solution:
An intrinsic semiconductor, also called an undoped semiconductor or i-type semiconductor, is a pure semiconductor without any significant dopant species present. The number of charge carriers is therefore determined by the properties of the material itself instead of the amount of impurities. In intrinsic semiconductors the number of excited electrons and the number of holes are equal: n = p.
Q10. In the circuit shown below the op-amps are ideal. Then Vout in Volts is
Answer : Option C
Explaination / Solution:
No Explaination.
