Q. In a parallel RC circuit, what happens to the total current as the capacitor charges?
A.
It increases.
B.
It decreases.
C.
It remains constant.
D.
It oscillates.
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Solution
As the capacitor charges, the current through the capacitor decreases, leading to a decrease in total current.
Correct Answer:
B
— It decreases.
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Q. In a parallel RC circuit, what happens to the voltage across the capacitor as time approaches infinity?
A.
It approaches zero
B.
It approaches the supply voltage
C.
It oscillates
D.
It becomes negative
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Solution
In a parallel RC circuit, as time approaches infinity, the voltage across the capacitor approaches the supply voltage.
Correct Answer:
B
— It approaches the supply voltage
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Q. In a perfectly inelastic collision, what happens to the kinetic energy of the system?
A.
It is conserved
B.
It is lost
C.
It is doubled
D.
It is halved
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Solution
In a perfectly inelastic collision, the two colliding objects stick together, and some kinetic energy is transformed into other forms of energy, resulting in a loss of kinetic energy.
Correct Answer:
B
— It is lost
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Q. In a polarizer, what happens to unpolarized light?
A.
It is completely absorbed
B.
It becomes polarized
C.
It is reflected
D.
It is refracted
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Solution
When unpolarized light passes through a polarizer, it becomes polarized, with the electric field oscillating in a specific direction.
Correct Answer:
B
— It becomes polarized
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Q. In a semiconductor, what is the effect of doping?
A.
It increases the number of free electrons.
B.
It decreases the conductivity.
C.
It makes the material more insulating.
D.
It has no effect on the material.
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Solution
Doping a semiconductor introduces impurities that increase the number of free charge carriers, enhancing its electrical conductivity.
Correct Answer:
A
— It increases the number of free electrons.
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Q. In a semiconductor, what is the role of doping?
A.
To increase the electrical resistance.
B.
To create free charge carriers.
C.
To decrease the band gap.
D.
To make the material more opaque.
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Solution
Doping a semiconductor involves adding impurities to create free charge carriers (electrons or holes), which enhances its electrical conductivity.
Correct Answer:
B
— To create free charge carriers.
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Q. In a series circuit with a 10 Ω and a 20 Ω resistor, what is the total resistance?
A.
10 Ω
B.
20 Ω
C.
30 Ω
D.
5 Ω
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Solution
Total resistance in series is R_total = R1 + R2 = 10 Ω + 20 Ω = 30 Ω.
Correct Answer:
C
— 30 Ω
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Q. In a series circuit with a 12 V battery and two resistors of 3 Ω and 6 Ω, what is the current flowing through the circuit?
A.
1 A
B.
2 A
C.
3 A
D.
4 A
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Solution
Total resistance R_total = R1 + R2 = 3 Ω + 6 Ω = 9 Ω. Current I = V/R_total = 12 V / 9 Ω = 1.33 A, approximately 1 A.
Correct Answer:
B
— 2 A
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Q. In a series circuit with a 12 V battery and two resistors of 4 Ω and 6 Ω, what is the voltage across the 4 Ω resistor?
A.
4.8 V
B.
6 V
C.
8 V
D.
3.6 V
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Solution
Total resistance R = 4 Ω + 6 Ω = 10 Ω. Current I = V/R = 12 V / 10 Ω = 1.2 A. Voltage across 4 Ω = I * R = 1.2 A * 4 Ω = 4.8 V.
Correct Answer:
A
— 4.8 V
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Q. In a series circuit with a 12 V battery and two resistors of 4 Ω and 6 Ω, what is the current flowing through the circuit?
A.
1.2 A
B.
0.8 A
C.
2 A
D.
1 A
Show solution
Solution
Total resistance R = R1 + R2 = 4 Ω + 6 Ω = 10 Ω. Current I = V/R = 12 V / 10 Ω = 1.2 A.
Correct Answer:
A
— 1.2 A
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Q. In a series circuit with a 12V battery and two resistors (4Ω and 6Ω), what is the total current flowing through the circuit?
A.
0.5 A
B.
1 A
C.
1.2 A
D.
2 A
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Solution
Total resistance R = R1 + R2 = 4Ω + 6Ω = 10Ω. Current I = V/R = 12V / 10Ω = 1.2 A.
Correct Answer:
B
— 1 A
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Q. In a series circuit with a 12V battery and two resistors of 4Ω and 6Ω, what is the total current flowing through the circuit?
Show solution
Solution
The total resistance in series is R_total = R1 + R2 = 4Ω + 6Ω = 10Ω. Using Ohm's law, I = V/R_total = 12V / 10Ω = 1.2A.
Correct Answer:
B
— 2A
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Q. In a series circuit with two capacitors of capacitance 3 µF and 6 µF, what is the total capacitance?
A.
2 µF
B.
1 µF
C.
9 µF
D.
4 µF
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Solution
Total capacitance in series is given by 1/C_total = 1/C1 + 1/C2. Thus, 1/C_total = 1/3 + 1/6 = 1/2, so C_total = 2 µF.
Correct Answer:
A
— 2 µF
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Q. In a series circuit with two resistors R1 and R2, what is the total resistance (R_total)?
A.
R_total = R1 + R2
B.
R_total = R1 * R2 / (R1 + R2)
C.
R_total = R1 - R2
D.
R_total = R1 / R2
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Solution
In a series circuit, the total resistance is simply the sum of the individual resistances: R_total = R1 + R2.
Correct Answer:
A
— R_total = R1 + R2
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Q. In a series RC circuit, how does the total impedance (Z) relate to resistance (R) and reactance (Xc)?
A.
Z = R + Xc
B.
Z = R - Xc
C.
Z = R*Xc
D.
Z = R/Xc
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Solution
In a series RC circuit, the total impedance is given by Z = R + Xc, where Xc is the capacitive reactance.
Correct Answer:
A
— Z = R + Xc
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Q. In a series RC circuit, if the resistance is doubled, how does the time constant change?
A.
It remains the same.
B.
It doubles.
C.
It halves.
D.
It quadruples.
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Solution
The time constant τ = R * C, so if R is doubled, τ also doubles.
Correct Answer:
B
— It doubles.
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Q. In a series RC circuit, if the resistance is doubled, what happens to the time constant?
A.
It remains the same.
B.
It doubles.
C.
It halves.
D.
It quadruples.
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Solution
The time constant τ = R * C will double if the resistance R is doubled, assuming capacitance C remains constant.
Correct Answer:
B
— It doubles.
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Q. In a series RC circuit, what happens to the current as the capacitor charges?
A.
Increases
B.
Decreases
C.
Remains constant
D.
Oscillates
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Solution
As the capacitor charges, the current decreases exponentially until it approaches zero.
Correct Answer:
B
— Decreases
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Q. In a series RC circuit, what is the time constant (τ) defined as?
A.
τ = R * C
B.
τ = R / C
C.
τ = C / R
D.
τ = R + C
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Solution
The time constant τ in a series RC circuit is defined as τ = R * C, where R is resistance and C is capacitance.
Correct Answer:
A
— τ = R * C
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Q. In a simple AC circuit, if the voltage is given by V(t) = 10 sin(100t), what is the peak voltage?
A.
5 V
B.
10 V
C.
15 V
D.
20 V
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Solution
The peak voltage is the coefficient of the sine function, which is 10 V.
Correct Answer:
B
— 10 V
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Q. In a simple harmonic motion (SHM), what is the relationship between the period and frequency?
A.
T = f^2
B.
T = 1/f
C.
T = f
D.
T = 2πf
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Solution
The period (T) is the reciprocal of frequency (f), given by T = 1/f.
Correct Answer:
B
— T = 1/f
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Q. In a simple series circuit with a 12V battery and two resistors (4Ω and 8Ω), what is the total current flowing through the circuit?
Show solution
Solution
Total resistance R_total = R1 + R2 = 4Ω + 8Ω = 12Ω. Using Ohm's Law, I = V / R_total = 12V / 12Ω = 1A.
Correct Answer:
B
— 2A
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Q. In a stable rolling motion, what is the relationship between the center of mass and the base of the object?
A.
The center of mass must be above the base.
B.
The center of mass must be below the base.
C.
The center of mass must be at the edge of the base.
D.
The center of mass can be anywhere.
Show solution
Solution
For stability in rolling motion, the center of mass must be above the base to ensure that the object does not tip over.
Correct Answer:
A
— The center of mass must be above the base.
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Q. In a system of particles, if the total external torque is zero, what can be said about the angular momentum of the system?
A.
It is constant
B.
It is increasing
C.
It is decreasing
D.
It is zero
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Solution
If the total external torque acting on a system of particles is zero, the angular momentum of the system remains constant according to the conservation of angular momentum.
Correct Answer:
A
— It is constant
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Q. In a system of particles, if the total momentum before a collision is equal to the total momentum after the collision, what type of collision is this?
A.
Elastic collision
B.
Inelastic collision
C.
Perfectly inelastic collision
D.
Explosive collision
Show solution
Solution
This describes an elastic collision, where both momentum and kinetic energy are conserved.
Correct Answer:
A
— Elastic collision
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Q. In a system of rigid bodies, if one body exerts a force on another, what is true about the reaction force?
A.
It is equal and opposite
B.
It is greater than the applied force
C.
It is less than the applied force
D.
It acts in the same direction
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Solution
According to Newton's third law, for every action, there is an equal and opposite reaction, meaning the reaction force is equal and opposite to the applied force.
Correct Answer:
A
— It is equal and opposite
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Q. In a transient response of an RC circuit, what is the behavior of the current as the capacitor charges?
A.
It remains constant
B.
It decreases exponentially
C.
It increases linearly
D.
It oscillates
Show solution
Solution
In the transient response of an RC circuit, the current decreases exponentially as the capacitor charges.
Correct Answer:
B
— It decreases exponentially
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Q. In a Zener diode, what is the primary function?
A.
To rectify AC to DC
B.
To regulate voltage
C.
To amplify signals
D.
To store energy
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Solution
A Zener diode is designed to regulate voltage by allowing current to flow in the reverse direction when a specific reverse voltage is reached.
Correct Answer:
B
— To regulate voltage
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Q. In a Zener diode, what is the primary use of the breakdown region?
A.
To amplify signals
B.
To regulate voltage
C.
To rectify current
D.
To store energy
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Solution
Zener diodes are designed to operate in the breakdown region to provide voltage regulation by maintaining a constant output voltage.
Correct Answer:
B
— To regulate voltage
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Q. In an AC circuit, what is the relationship between voltage (V), current (I), and impedance (Z)?
A.
V = I * Z
B.
I = V * Z
C.
Z = V / I
D.
Z = I / V
Show solution
Solution
In an AC circuit, the voltage is related to current and impedance by V = I * Z.
Correct Answer:
A
— V = I * Z
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