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BS Electronics Entrance Test MCQS Past Papers

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1. Which one of the following is not a vector quantity?
(A) Kinetic energy (B) Momentum
(C) Acceleration (D) Force

2. If the distance is doubled between two charges, then Coulomb force becomes:
(A) Reduce four times (B) Double
(C) Half (D) Remain same

3. What is the unit of Power?
(A) Watt (B) kilo watt hour
(C) Newton (D) Joules

4. The power dissipated in a resistor is 12.8 watts when 4A current is passed. How
much power will be dissipated if 6A current is passed through the same resistor?
(A) 16 watts (B) 24 watts
(C) 28.8 watts (D) 32.6 watts

5. An instrument which measure potential difference without drawing current?
(A) Potentiometer (B) 24 watts
(C) Galvanometer (D) Voltmeter

6. Ammeter is a galvanometer with:
(A) High resistance in series (B) High resistance in parallel
(C) Low resistance in series (D) Low resistance in parallel

7. Electric generators work on the principle of:
(A) Coulomb’s law (B) Newton’s law of gravitation
(C) Ampere’s law (D) Electromagnetic Induction

8. A transformer has 100 turns on the input side and 500 turns on the output side. If
the rms value of the input voltage and current are 220 V and 2 A respectively, then
the output power is about:
(A) 480 watt (B) 220 watt
(C) 440 watt (D) 110 watt

9. The frequency of AC used in Pakistan is:
(A) 30 Hz (B) 50 Hz
(C) 90 Hz (D) 180 Hz

10. Materials in which there is a very large gap between the conduction and valence
energy band are called:
(A) Semiconductors (B) Superconductor
(C) Conductor (D) Insulator

11. A diode cannot be used as a:
(A) Switch (B) Amplifier
(C) Rectifier (D) light source

12. The process of combining low frequency waves with high frequency is called:
(A) Rectification (B) Amplification
(C) Modulation (D) Magnification

13. In a pure resistive circuit current and voltage are:
(A) In phase (B) Out of phase
(C) Current leads (D) Voltage leads

14. A reverse biased PN junction acts as a:
(A) Capacitor (B) Off switch
(C) Inductor (D) ON switch

15. LDR is a sensor for:
(A) Light (B) Heat
(C) Electricity (D) Pressure

Answers: A, A, A, C, A, D, D, C, B, D, B, C, A, B, A

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