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600
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1. The SI unit of electric charge is –
A. Ampere
B. Volt
C. Coulomb
D. Ohm
2. One coulomb of charge is equal to approximately –
A. 6 × 10¹⁶ electrons
B. 6 × 10¹⁷ electrons
C. 6 × 10¹⁸ electrons
D. 6 × 10¹⁹ electrons
4. The SI unit of electric current is –
A. Volt
B. Ohm
C. Ampere
D. Watt
5. 1 A of current is defined as –
A. 1 J per second
B. 1 C per second
C. 1 V per second
D. 1 W per second
6. An ammeter is always connected in –
A. Parallel
B. Series
C. Across battery
D. Across resistor
7. The direction of conventional current is –
A. Same as electron flow
B. Opposite to electron flow
C. Random
D. Along the electric field only
8. The unit of potential difference is –
A. Ampere
B. Coulomb
C. Watt
D. Volt
9. One volt is equal to –
A. 1 J/C
B. 1 C/J
C. 1 A/C
D. 1 C/A
10. A voltmeter is always connected –
A. In series
B. In parallel
C. In series-parallel
D. Across ammeter
11. Ohm’s law states that –
A. V ∝ 1/I
B. V ∝ I
C. I ∝ R
D. R ∝ V²
12. The SI unit of resistance is –
A. Ohm
B. Watt
C. Coulomb
D. Joule
13. 1 ohm is equal to –
A. 1 V/A
B. 1 A/V
C. 1 W/A
D. 1 C/V
14. The relation between current, potential difference, and resistance is –
A. I = V/R
B. V = R/I
C. R = 1/VI
D. P = VI
15. The device used to regulate current without changing voltage source is –
A. Voltmeter
B. Rheostat
C. Ammeter
D. Fuse
16. Resistance of a conductor is directly proportional to its –
A. Area
B. Square of diameter
C. Length
D. Resistivity only
17. Resistance of a conductor is inversely proportional to its –
A. Length
B. Area of cross-section
C. Volume
D. Current
18. The SI unit of resistivity is –
A. Ohm metre
B. Ohm/cm
C. Ohm/ampere
D. Ohm/volt
19. A good conductor has –
A. High resistivity
B. Low resistivity
C. Zero resistivity
D. Negative resistivity
20. Insulators have resistivity of the order of –
A. 10⁻⁸ Ω m
B. 10⁻² Ω m
C. 10¹² – 10¹⁷ Ω m
D. 10⁻⁶ Ω m
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