Unit 18: Electronics + Unit 19: Electromagnetism

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1. A PN junction is formed by joining:

A Two N-type materials

B Two P-type materials

C P-type and N-type materials

D Metal and semiconductor

2. AC generator uses which type of rings?

A Split rings

B Slip rings

C Commutator

D Carbon rings

3. The working principle of electric generator is:

A Heating effect

B Chemical effect

C Electromagnetic induction

D Electrostatic force

4. Increasing the number of turns in a coil will:

A Decrease induced emf

B Have no effect

C Increase induced emf

D Stop induction

5. Analogue signals vary:

A In steps

B Digitally

C Continuously

D Randomly

6. Inside a long solenoid, the magnetic field is:

A Zero

B Weak and varying

C Strong and uniform

D Random

7. A step-up transformer increases:

A Current

B Power

C Voltage

D Resistance

8. When a transistor is used as a switch, it operates in:

A Active region

B Cut-off and saturation regions

C Linear region

D Breakdown region

9. Which device converts electrical energy into mechanical energy?

A Generator

B Transformer

C Electric motor

D CRO

10. Which impurity is added to make a P-type semiconductor?

A Pentavalent

B Trivalent

C Hexavalent

D Divalent

Unit 18: Electronics + Unit 19: Electromagnetism

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