Which material has the highest resistivity?
a. Copper
b. Aluminum
c. Silver
d. Nichrome
Answer: d. Nichrome
What is the unit of inductance?
a. Volt
b. Ampere
c. Farad
d. Henry
Answer: d. Henry
What is the unit of capacitance?
a. Henry
b. Farad
c. Ohm
d. Watt
Answer: b. Farad
What is the unit of frequency?
a. Hertz
b. Watt
c. Ohm
d. Farad
Answer: a. Hertz
What is the function of a transformer?
a. To increase voltage
b. To decrease voltage
c. To increase or decrease voltage
d. To store electrical energy
Answer: c. To increase or decrease voltage
What is the purpose of a rectifier?
a. To convert AC to DC
b. To convert DC to AC
c. To store electrical energy
d. To regulate voltage
Answer: a. To convert AC to DC
What is the difference between a diode and a transistor?
a. Diode has two terminals while transistor has three terminals
b. Diode is a current-controlled device while transistor is a voltage-controlled device
c. Diode is a passive device while transistor is an active device
d. Diode is used for amplification while transistor is used for rectification
Answer: a. Diode has two terminals while transistor has three terminals
What is the purpose of a capacitor in a circuit?
a. To store electrical energy
b. To regulate voltage
c. To increase current
d. To convert AC to DC
Answer: a. To store electrical energy
What is the function of an inductor in a circuit?
a. To store electrical energy
b. To regulate voltage
c. To increase current
d. To convert AC to DC
Answer: c. To increase current
What is the function of a resistor in a circuit?
a. To store electrical energy
b. To regulate voltage
c. To increase current
d. To limit current
Answer: d. To limit current
What is the formula for the voltage across an inductor in an AC circuit?
a. V = LdI/dt
b. V = I/R
c. V = IR
d. V = I/ωC
Answer: a. V = LdI/dt
What is the formula for the power consumed by a capacitor in an AC circuit?
a. P = V²/R
b. P = I²R
c. P = VIcos(θ)
d. P = VIsin(θ)
Answer: d. P = VIsin(θ)
What is the formula for the resonant frequency of an LC circuit?
a. f = 1/(2π√LC)
b. f = 1/(2π√L/C)
c. f = 2π√LC
d. f = 2π√L/C
Answer: b. f = 1/(2π√L/C)
What is the formula for the power consumed by an inductor in an AC circuit?
a. P = V²/R
b. P = I²R
c. P = VIcos(θ)
d. P = VIsin(θ)
Answer: c. P = VIcos(θ)
What is the formula for the impedance of an RC circuit?
a. Z = R/ωC
b. Z = ωC/R
c. Z = R²/ωC
d. Z = ωC/R²
Answer: a. Z = R/ωC
What is the formula for the voltage drop across a resistor in a series circuit?
a. V = IR
b. V = I/R
c. V = I-IR
d. V = I+IR
Answer: a. V = IR
What is the formula for the power consumed by a resistor in an AC circuit?
a. P = VIcos(θ)
b. P = VIsin(θ)
c. P = V²/R
d. P = I²R
Answer: c. P = V²/R
What is the formula for the capacitance of a parallel-plate capacitor?
a. C = ε₀A/d
b. C = d/ε₀A
c. C = A/d
d. C = ε₀d/A
Answer: a. C = ε₀A/d
What is the formula for the energy stored in a capacitor?
a. U = ½CV²
b. U = ½QV
c. U = ½CQ²
d. U = ½CV
Answer: a. U = ½CV²
What is the formula for the power consumed in a resistive circuit?
a. P = VI
b. P = V²/R
c. P = I²R
d. P = V/R
Answer: c. P = I²R
What is the formula for the electric potential at a point in space?
a. V = kQ/r
b. V = kQ/r²
c. V = kQ²/r
d. V = kQ²/r²
Answer: b. V = kQ/r²
What is the formula for the magnetic field strength at the center of a circular loop of wire?
a. H = NI/2r
b. H = NI/r
c. H = NI/4r
d. H = NI/8r
Answer: b. H = NI/r
What is the formula for the inductance of a solenoid?
a. L = μN²A/l
b. L = μN²l/A
c. L = μN/A²
d. L = μN²A
Answer: a. L = μN²A/l
What is the formula for the power factor of a capacitive circuit?
a. cos θ = R/Z
b. cos θ = XC/Z
c. cos θ = XL/Z
d. cos θ = S/P
Answer: b. cos θ = XC/Z
What is the formula for the energy stored in a magnetic field?
a. U = ½LI²
b. U = ½LI
c. U = ½B²/μ
d. U = ½μB
Answer: a. U = ½LI²
What is the formula for the force on a current-carrying wire in a magnetic field?
a. F = BIℓ
b. F = BI
c. F = B/ℓ
d. F = Bℓ
Answer: a. F = BIℓ
What is the formula for the magnetic field inside a solenoid?
a. B = μN/l
b. B = μNI
c. B = μN/lI
d. B = μNI/l
Answer: b. B = μNI
What is the formula for the capacitance of a cylindrical capacitor?
a. C = 2πε₀L/ln(b/a)
b. C = 2πε₀ln(b/a)/L
c. C = 2πε₀L/ln(a/b)
d. C = 2πε₀ln(a/b)/L
Answer: a. C = 2πε₀L/ln(b/a)
What is the unit of electric current?
a. Volt
b. Ampere
c. Ohm
d. Watt
Answer: b. Ampere
What is the formula for electrical power?
a. P = V × I
b. P = V/I
c. P = I/V
d. P = I²R
Answer: a. P = V × I
What is the formula for electric potential difference?
a. V = IR
b. V = I/R
c. V = P/I
d. V = Q/C
Answer: b. V = I/R
What is the formula for electric current?
a. I = V/R
b. I = R/V
c. I = P/V
d. I = Q/t
Answer: d. I = Q/t
What is the formula for capacitance?
a. C = Q/V
b. C = V/Q
c. C = I/R
d. C = R/I
Answer: a. C = Q/V
What is the formula for inductance?
a. L = IR
b. L = V/I
c. L = V/R
d. L = Φ/I
Answer: d. L = Φ/I
What is the formula for impedance in an AC circuit?
a. Z = R
b. Z = XL
c. Z = XC
d. Z = R + XL + XC
Answer: d. Z = R + XL + XC
What is the formula for reactance in an AC circuit?
a. XL = 2πfL
b. XC = 1/2πfC
c. XC = 2πfC
d. XL = 1/2πfL
Answer: a. XL = 2πfL
What is the formula for power factor in an AC circuit?
a. cos θ = R/Z
b. cos θ = XC/Z
c. cos θ = XL/Z
d. cos θ = P/S
Answer: a. cos θ = R/Z
What is the formula for frequency in an AC circuit?
a. f = 1/T
b. f = 2π/T
c. f = 1/2πT
d. f = T/2π
Answer: a. f = 1/T
What is the unit of magnetic flux?
a. Tesla
b. Weber
c. Henry
d. Gauss
Answer: b. Weber
What is the formula for magnetic field strength?
a. H = B/μ
b. H = μB
c. H = Bμ
d. H = B²/μ
Answer: a. H = B/μ
What is the formula for the force between two charged particles?
a. F = kQ₁Q₂/r²
b. F = kQ₁Q₂/r
c. F = kQ₁/r²
d. F = kQ₂/r²
Answer: a. F = kQ₁Q₂/r²
What is the unit of electric flux density?
a. Coulomb
b. Volt/meter
c. Farad
d. Ampere/meter²
Answer: d. Ampere/meter²
The unit of electric charge is:
a. Volt
b. Ohm
c. Coulomb
d. Ampere
Answer: c. Coulomb
What is the symbol for resistance?
a. R
b. V
c. I
d. Q
Answer: a. R
What is the formula for power?
a. P = VI
b. P = IR
c. P = V/R
d. P = R/V
Answer: c. P = V/R
A circuit with a resistance of 5 ohms and a current of 2 amps has a power of:
a. 0.4 watts
b. 2 watts
c. 5 watts
d. 10 watts
Answer: d. 10 watts
What is the formula for Ohm's Law?
a. V = IR
b. I = VR
c. R = VI
d. V = RI
Answer: a. V = IR
The direction of current flow in a circuit is from:
a. Positive to negative
b. Negative to positive
c. Depends on the circuit
d. There is no direction to current flow
Answer: a. Positive to negative
What is the unit for voltage?
a. Watt
b. Ampere
c. Volt
d. Ohm
Answer: c. Volt
A circuit has a voltage of 12 volts and a resistance of 4 ohms. What is the current in the circuit?
a. 3 amps
b. 8 amps
c. 48 amps
d. 144 amps
Answer: a. 3 amps
What is the formula for capacitance?
a. C = Q/V
b. C = V/Q
c. C = I/R
d. C = R/I
Answer: a. C = Q/V
What is the unit of frequency?
a. Hertz
b. Newton
c. Joule
d. Watt
Answer: a. Hertz
What is the formula for inductance?
a. L = IR
b. L = V/I
c. L = V/R
d. L = Φ/I
Answer: d. L = Φ/I
A circuit has an inductance of 0.1 henry and a current of 2 amps. What is the magnetic flux in the circuit?
a. 0.2 Wb
b. 0.05 Wb
c. 0.02 Wb
d. 0.01 Wb
Answer: d. 0.01 Wb
What is the unit of electric power?
a. Watt
b. Volt
c. Ohm
d. Ampere
Answer: a. Watt
A circuit has a voltage of 120 volts and a current of 5 amps. What is the power in the circuit?
a. 24 watts
b. 600 watts
c. 6000 watts
d. 24000 watts
Answer: b. 600 watts
What is the unit of electric potential difference?
a. Watt
b. Volt
c. Ohm
d. Ampere
Answer: b. Volt
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