Q. What is the relationship between induced emf and the resistance of the circuit?
A.
Induced emf is independent of resistance
B.
Higher resistance leads to higher induced emf
C.
Lower resistance leads to higher induced emf
D.
Induced emf is inversely proportional to resistance
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Solution
Induced emf is independent of the resistance of the circuit; however, the current produced will be affected by the resistance according to Ohm's law.
Correct Answer:
A
— Induced emf is independent of resistance
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Q. What is the relationship between linear momentum and angular momentum for a rolling object?
A.
They are equal.
B.
Angular momentum is linear momentum multiplied by radius.
C.
Angular momentum is linear momentum divided by radius.
D.
They are independent of each other.
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Solution
The angular momentum (L) of a rolling object is related to its linear momentum (p) by the equation L = p * r, where r is the radius.
Correct Answer:
B
— Angular momentum is linear momentum multiplied by radius.
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Q. What is the relationship between linear velocity and angular velocity for a point on a rotating rigid body?
A.
v = rω
B.
v = ω/r
C.
v = r/ω
D.
v = ω + r
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Solution
The relationship between linear velocity (v) and angular velocity (ω) for a point on a rotating rigid body is given by v = rω, where r is the radius.
Correct Answer:
A
— v = rω
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Q. What is the relationship between temperature and kinetic energy in gases?
A.
Directly proportional
B.
Inversely proportional
C.
No relationship
D.
Exponential relationship
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Solution
The average kinetic energy of gas molecules is directly proportional to the temperature of the gas.
Correct Answer:
A
— Directly proportional
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Q. What is the relationship between the charge (Q) and the voltage (V) across a capacitor?
A.
Q = V/R
B.
Q = C*V
C.
Q = V/C
D.
Q = R*V
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Solution
The relationship between the charge and the voltage across a capacitor is given by Q = C*V, where C is the capacitance.
Correct Answer:
B
— Q = C*V
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Q. What is the relationship between the energy of a photon and its frequency?
A.
Energy is directly proportional to frequency
B.
Energy is inversely proportional to frequency
C.
Energy is independent of frequency
D.
Energy is proportional to the square of frequency
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Solution
The energy of a photon is directly proportional to its frequency, as given by the equation E = hf, where h is Planck's constant.
Correct Answer:
A
— Energy is directly proportional to frequency
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Q. What is the relationship between the root mean square speed (v_rms) and temperature (T) for an ideal gas?
A.
v_rms = sqrt(3kT/m)
B.
v_rms = sqrt(2kT/m)
C.
v_rms = sqrt(kT/m)
D.
v_rms = 3kT/m
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Solution
The root mean square speed is given by v_rms = sqrt(3kT/m), where k is the Boltzmann constant and m is the mass of a gas molecule.
Correct Answer:
A
— v_rms = sqrt(3kT/m)
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Q. What is the relationship between torque and angular acceleration for a rigid body?
A.
Torque = Moment of inertia × Angular velocity
B.
Torque = Moment of inertia × Angular acceleration
C.
Torque = Angular acceleration / Moment of inertia
D.
Torque = Angular velocity × Moment of inertia
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Solution
The relationship is given by the equation τ = Iα, where τ is torque, I is moment of inertia, and α is angular acceleration.
Correct Answer:
B
— Torque = Moment of inertia × Angular acceleration
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Q. What is the relationship between torque and angular acceleration?
A.
Torque = I * α
B.
Torque = F * r
C.
Torque = m * a
D.
Torque = p * v
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Solution
The relationship between torque (τ) and angular acceleration (α) is given by τ = I * α, where I is the moment of inertia.
Correct Answer:
A
— Torque = I * α
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Q. What is the relationship between voltage (V), current (I), and resistance (R) according to Ohm's Law?
A.
V = I * R
B.
I = V * R
C.
R = V / I
D.
V = R / I
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Solution
According to Ohm's Law, the relationship is V = I * R.
Correct Answer:
A
— V = I * R
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Q. What is the relationship between voltage, current, and resistance in an RC circuit according to Ohm's Law?
A.
V = I * R
B.
I = V * R
C.
R = V/I
D.
Both A and C
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Solution
According to Ohm's Law, the relationship is V = I * R and R = V/I, so both A and C are correct.
Correct Answer:
D
— Both A and C
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Q. What is the role of a rectifier in a semiconductor circuit?
A.
To convert DC to AC
B.
To convert AC to DC
C.
To amplify signals
D.
To store electrical energy
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Solution
A rectifier is used in semiconductor circuits to convert alternating current (AC) to direct current (DC), allowing for the use of AC power in DC applications.
Correct Answer:
B
— To convert AC to DC
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Q. What is the root mean square speed of gas molecules at a temperature of 300 K for a gas with a molar mass of 0.029 kg/mol?
A.
300 m/s
B.
400 m/s
C.
500 m/s
D.
600 m/s
Show solution
Solution
Using the formula v_rms = sqrt(3RT/M), where R = 8.314 J/(mol·K), T = 300 K, and M = 0.029 kg/mol, we find v_rms ≈ 400 m/s.
Correct Answer:
B
— 400 m/s
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Q. What is the root mean square speed of nitrogen gas (N2) at 300 K? (Molar mass of N2 = 28 g/mol)
A.
400 m/s
B.
500 m/s
C.
600 m/s
D.
700 m/s
Show solution
Solution
The root mean square speed is given by the formula v_rms = sqrt(3RT/M), where R = 8.314 J/(mol·K), T = 300 K, and M = 0.028 kg/mol. v_rms = sqrt(3 * 8.314 * 300 / 0.028) ≈ 500 m/s.
Correct Answer:
B
— 500 m/s
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Q. What is the rotational equivalent of Newton's second law?
A.
τ = I * α
B.
F = m * a
C.
W = F * d
D.
p = m * v
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Solution
The rotational equivalent of Newton's second law is τ = I * α, where τ is torque, I is moment of inertia, and α is angular acceleration.
Correct Answer:
A
— τ = I * α
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Q. What is the significance of the emission spectrum of an atom?
A.
It shows the mass of the atom
B.
It indicates the energy levels of electrons
C.
It determines the size of the nucleus
D.
It reveals the temperature of the atom
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Solution
The emission spectrum of an atom indicates the energy levels of electrons, as each line corresponds to a transition between energy levels.
Correct Answer:
B
— It indicates the energy levels of electrons
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Q. What is the significance of the wave-particle duality in quantum mechanics?
A.
Particles can only behave as waves.
B.
Waves can only behave as particles.
C.
Particles exhibit both wave-like and particle-like properties.
D.
There is no duality; they are separate phenomena.
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Solution
Wave-particle duality is a fundamental concept in quantum mechanics that states that every particle or quantum entity can be described as either a particle or a wave, depending on the experimental conditions.
Correct Answer:
C
— Particles exhibit both wave-like and particle-like properties.
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Q. What is the significance of the wave-particle duality?
A.
It shows that particles can only behave as waves.
B.
It indicates that light and matter exhibit both wave-like and particle-like properties.
C.
It proves that energy is quantized.
D.
It suggests that particles can exist in multiple locations.
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Solution
Wave-particle duality is significant because it reveals that light and matter can exhibit both wave-like and particle-like properties, depending on the experimental conditions.
Correct Answer:
B
— It indicates that light and matter exhibit both wave-like and particle-like properties.
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Q. What is the specific heat capacity of a substance if 2000 J of heat raises its temperature from 20°C to 60°C for 1 kg of the substance?
A.
1000 J/kg°C
B.
2000 J/kg°C
C.
500 J/kg°C
D.
3000 J/kg°C
Show solution
Solution
Specific heat capacity (c) is calculated as c = Q / (m * ΔT) = 2000 J / (1 kg * 40°C) = 50 J/kg°C.
Correct Answer:
A
— 1000 J/kg°C
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Q. What is the specific heat capacity of a substance if 500 J of heat raises the temperature of 2 kg of the substance by 10°C?
A.
25 J/kg°C
B.
50 J/kg°C
C.
100 J/kg°C
D.
200 J/kg°C
Show solution
Solution
Using Q = mcΔT, we have 500 = 2 * c * 10, thus c = 500 / 20 = 25 J/kg°C.
Correct Answer:
B
— 50 J/kg°C
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Q. What is the speed of a wave if its frequency is 500 Hz and its wavelength is 2 meters?
A.
1000 m/s
B.
250 m/s
C.
500 m/s
D.
2000 m/s
Show solution
Solution
The speed of a wave is given by the formula v = f * λ. Here, v = 500 Hz * 2 m = 1000 m/s.
Correct Answer:
A
— 1000 m/s
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Q. What is the standard unit of length in the SI system?
A.
Centimeter
B.
Meter
C.
Kilometer
D.
Millimeter
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Solution
The standard unit of length in the SI system is the meter (m).
Correct Answer:
B
— Meter
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Q. What is the term for the bending of light as it passes from one medium to another?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Dispersion
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Solution
Refraction is the change in direction of light due to a change in its speed when entering a different medium.
Correct Answer:
B
— Refraction
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Q. What is the term for the bending of waves around obstacles?
A.
Reflection
B.
Refraction
C.
Diffraction
D.
Interference
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Solution
The bending of waves around obstacles is known as diffraction.
Correct Answer:
C
— Diffraction
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Q. What is the term for the energy required to change a substance from solid to liquid at its melting point?
A.
Latent heat of fusion
B.
Latent heat of vaporization
C.
Specific heat
D.
Thermal energy
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Solution
The energy required to change a substance from solid to liquid at its melting point is called the latent heat of fusion.
Correct Answer:
A
— Latent heat of fusion
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Q. What is the term for the expansion of materials when heated?
A.
Thermal contraction
B.
Thermal expansion
C.
Thermal equilibrium
D.
Thermal conductivity
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Solution
Thermal expansion refers to the increase in volume of materials when they are heated.
Correct Answer:
B
— Thermal expansion
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Q. What is the term for the maximum displacement of a wave from its equilibrium position?
A.
Wavelength
B.
Amplitude
C.
Frequency
D.
Period
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Solution
Amplitude is defined as the maximum displacement of a wave from its equilibrium position.
Correct Answer:
B
— Amplitude
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Q. What is the term for the minimum amount of energy required to remove an electron from an atom?
A.
Ionization energy
B.
Binding energy
C.
Dissociation energy
D.
Activation energy
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Solution
Ionization energy is the minimum amount of energy required to remove an electron from an atom, leading to the formation of a positive ion.
Correct Answer:
A
— Ionization energy
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Q. What is the term for the minimum energy required to remove an electron from an atom?
A.
Ionization energy
B.
Binding energy
C.
Dissociation energy
D.
Activation energy
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Solution
Ionization energy is the minimum energy required to remove an electron from an atom, leading to the formation of a positively charged ion.
Correct Answer:
A
— Ionization energy
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Q. What is the thermal conductivity of a material if a 1 m² area conducts 100 W of heat through a thickness of 0.1 m with a temperature difference of 50°C?
A.
0.2 W/m°C
B.
0.5 W/m°C
C.
1 W/m°C
D.
2 W/m°C
Show solution
Solution
Using Fourier's law, Q = kA(ΔT/d), we have 100 = k * 1 * (50/0.1), thus k = 0.5 W/m°C.
Correct Answer:
B
— 0.5 W/m°C
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