JEE PHYSICS UNIT 12
QUIZ NO 4
TOTAL QUESTIONS = 20
1. The SI unit of electric current is
A. Coulomb
B. Volt
C. Ohm
D. Ampere
2. Ohm's law is valid for
A. Semiconductors
B. Conductors
C. Insulators
D. Non-ohmic materials
3. The resistance of a wire depends on
A. Length of the wire
B. Area of cross-section
C. Material of the wire
D. All of the above
4. Kirchhoff's first law deals with the conservation of
A. Energy
B. Charge
C. Momentum
D. Mass
5. If the potential difference across a resistor is doubled, the current will
A. Be halved
B. Double
C. Remain the same
D. Be quadrupled
6. Which material has the least resistivity?
A. Copper
B. Iron
C. Mercury
D. Nichrome
7. The reciprocal of resistivity is
A. Conductance
B. Conductivity
C. Resistance
D. Permittivity
8. A voltmeter is used to measure
A. Current
B. Voltage
C. Resistance
D. Capacitance
9. The unit of electric power is
A. Joule
B. Watt
C. Ampere
D. Coulomb
10. The drift velocity of electrons in a conductor is
A. Directly proportional to the length of the conductor
B. Directly proportional to the electric field
C. Inversely proportional to the electric field
D. Inversely proportional to the length of the conductor
11. The power dissipated in a resistor is given by
A. I²R
B. IR²
C. IR
D. I/R
12. In a parallel circuit, the total resistance is
A. Less than the smallest individual resistance
B. The sum of all individual resistances
C. Equal to the largest individual resistance
D. More than the largest individual resistance
13. The device used to measure electric current is
A. Voltmeter
B. Ammeter
C. Ohmmeter
D. Wattmeter
14. The internal resistance of an ideal ammeter is
A. Zero
B. Infinite
C. Very high
D. Very low
15. The temperature coefficient of resistance is positive for
A. Semiconductors
B. Insulators
C. Metals
D. Superconductors
16. The equivalent resistance of two resistors R₁ and R₂ connected in series is
A. R₁ + R₂
B. 1/R₁ + 1/R₂
C. (R₁R₂)/(R₁ + R₂)
D. None of the above
17. The equivalent resistance of two resistors R₁ and R₂ connected in parallel is
A. R₁ + R₂
B. 1/R₁ + 1/R₂
C. (R₁R₂)/(R₁ + R₂)
D. None of the above
18. The drift velocity of electrons is of the order of
A. 10⁶ m/s
B. 10⁴ m/s
C. 10⁻¹ m/s
D. 10⁻⁴ m/s
19. The mobility of charge carriers is defined as
A. Drift velocity per unit electric field
B. Electric field per unit drift velocity
C. Current per unit voltage
D. Voltage per unit current
20. The resistivity of a material depends on
A. Length of the conductor
B. Cross-sectional area
C. Temperature
D. Shape of the conductor
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