Objective-type MCQs for the best preparation and conceptual questions for practice tests.
1. Main reason for the worldwide use of A.C is:
Ans. It is cheaper
2. The frequency of A.C sources used in Pakistan is:
Ans. 50Hz
3. The phase angle at +ve peak is
Ans. π/2
4. The value of peak-to-peak voltage is
Ans. 2V•
5. An A.C voltmeter reads 220 V, its peak value will be:
Ans. 311.12 V
6. Power dissipated in the pure inductor is:
Ans. Zero
7. Direct current cannot flow through:
Ans. Capacitor
8. Choke consumes extremely small:
Ans. Power
9. Resistance of pure choke is:
Ans. very small
10. Which device permits the flow of DC
Ans. Inductor
11. Power factor is equal to
Ans. cosθ
12. Electromagnetic waves emitted from radio antenna are ;
Ans. renseverse
13. Electromagnetic waves do not transport ………
Ans. Charge
14. The A.M transmission frequencies range from.
Ans. 540 kHz to 1600kHz
15. The F.M transmission frequencies range from;
Ans. 88MHz to 108MHz
16. A charging electric flux creates
Ans. Magnetic field
17. Example of a ductile substance is
Ans. lead
18. SI unit of modulus of elasticity is:
Ans. pascal (N/m²)
19. The young”s modulus of steel is.
Ans. 2 x 10^11 N/m²
20. Glass and high-carbon steel are examples of
Ans. Brittle substance