DXRDXR ASOC EXAM PRACTICE PORTAL · VU3DXR.IN
OPEN LEARNING LIBRARY

ASOC Question Bank

Browse MCQs, correct answers and explanations free of charge. No registration is required.

236 matching questions

Question #641Basic Electricity and Electronics

Which instrument measures voltage?

  1. Voltmeter ✓ Correct answer
  2. Ammeter
  3. Ohmmeter
  4. Frequency counter
Explanation: A voltmeter measures electric potential difference.

Open this question separately

Question #642Basic Electricity and Electronics

A semiconductor has conductivity

  1. Between a conductor and an insulator ✓ Correct answer
  2. Equal to a conductor
  3. Equal to an insulator
  4. Zero always
Explanation: Semiconductors have conductivity between conductors and insulators.

Open this question separately

Question #643Basic Electricity and Electronics

The majority carriers in an n-type semiconductor are

  1. Electrons ✓ Correct answer
  2. Holes
  3. Protons
  4. Neutrons
Explanation: In n-type material, majority carriers are electrons.

Open this question separately

Question #644Basic Electricity and Electronics

A diode allows current to flow mainly in

  1. One direction ✓ Correct answer
  2. Both directions equally
  3. No direction
  4. Three directions
Explanation: A diode conducts primarily in one direction (forward bias).

Open this question separately

Question #645Basic Electricity and Electronics

Forward bias of a diode means

  1. The anode is positive with respect to the cathode ✓ Correct answer
  2. The anode is negative with respect to the cathode
  3. Both terminals at same potential
  4. No battery is connected
Explanation: Forward bias: anode positive relative to cathode.

Open this question separately

Question #646Basic Electricity and Electronics

The process of converting AC to DC is called

  1. Rectification ✓ Correct answer
  2. Amplification
  3. Modulation
  4. Oscillation
Explanation: Rectification converts alternating current to direct current.

Open this question separately

Question #647Basic Electricity and Electronics

A bridge rectifier uses how many diodes?

  1. 4 ✓ Correct answer
  2. 1
  3. 2
  4. 3
Explanation: A full-wave bridge rectifier uses four diodes.

Open this question separately

Question #648Basic Electricity and Electronics

RMS value of a sine wave is approximately

  1. 0.707 × peak value ✓ Correct answer
  2. 1.414 × peak value
  3. 0.5 × peak value
  4. 2 × peak value
Explanation: For a sine wave, Vrms ≈ 0.707 × Vpeak.

Open this question separately

Question #649Basic Electricity and Electronics

Peak value of a sine wave is approximately

  1. 1.414 × RMS value ✓ Correct answer
  2. 0.707 × RMS value
  3. 0.5 × RMS value
  4. 2 × RMS value
Explanation: Vpeak ≈ 1.414 × Vrms for a sine wave.

Open this question separately

Question #650Basic Electricity and Electronics

Energy stored in a capacitor is given by

  1. (1/2)CV² ✓ Correct answer
  2. CV
  3. C/V
  4. V/C
Explanation: Energy in a capacitor is ½·C·V².

Open this question separately

Question #651Basic Electricity and Electronics

The unit of inductance is

  1. Henry ✓ Correct answer
  2. Farad
  3. Ohm
  4. Siemens
Explanation: Inductance is measured in henrys (H).

Open this question separately

Question #652Basic Electricity and Electronics

The unit of capacitance is

  1. Farad ✓ Correct answer
  2. Henry
  3. Ohm
  4. Tesla
Explanation: Capacitance is measured in farads (F).

Open this question separately

Question #653Basic Electricity and Electronics

Two 10 ohm resistors in parallel give

  1. 5 ohms ✓ Correct answer
  2. 20 ohms
  3. 10 ohms
  4. 100 ohms
Explanation: Equal parallel resistors: R/2 = 5 Ω.

Open this question separately

Question #654Basic Electricity and Electronics

Two 10 ohm resistors in series give

  1. 20 ohms ✓ Correct answer
  2. 5 ohms
  3. 10 ohms
  4. 100 ohms
Explanation: Series resistors add: 10+10 = 20 Ω.

Open this question separately

Question #655Basic Electricity and Electronics

Kirchhoff’s Current Law states that

  1. Algebraic sum of currents at a junction is zero ✓ Correct answer
  2. Sum of voltages in a loop is zero
  3. Power is always constant
  4. Resistance is constant
Explanation: KCL: total current entering a node equals total current leaving.

Open this question separately

Question #656Basic Electricity and Electronics

A zener diode is mainly used for

  1. Voltage regulation ✓ Correct answer
  2. Amplification
  3. Oscillation
  4. Rectification only
Explanation: Zener diodes are commonly used as voltage regulators.

Open this question separately