Modern Physics
Q. What is the minimum energy required to remove an electron from the surface of a metal called?
A.
Work function
B.
Ionization energy
C.
Binding energy
D.
Threshold energy
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Solution
The minimum energy required to remove an electron from the surface of a metal is known as the work function.
Correct Answer: A — Work function
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Q. What is the minimum frequency of light required to eject electrons from a metal surface in the photoelectric effect?
A.
It depends on the intensity of light
B.
It is constant for all metals
C.
It depends on the work function of the metal
D.
It is equal to the energy of the incident photons
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Solution
The minimum frequency required to eject electrons is determined by the work function of the metal, given by the equation E = hf, where E is the work function, h is Planck's constant, and f is the frequency.
Correct Answer: C — It depends on the work function of the metal
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Q. What is the Nyquist rate for a signal with a maximum frequency of 1 kHz? (2000)
A.
1 kHz
B.
2 kHz
C.
500 Hz
D.
4 kHz
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Solution
Nyquist rate = 2 * f_max = 2 * 1000 Hz = 2000 Hz = 2 kHz.
Correct Answer: B — 2 kHz
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Q. What is the Nyquist rate for a signal with a maximum frequency of 5 kHz?
A.
5 kHz
B.
10 kHz
C.
15 kHz
D.
20 kHz
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Solution
Nyquist rate = 2 * f_max = 2 * 5 kHz = 10 kHz.
Correct Answer: B — 10 kHz
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Q. What is the Nyquist rate in a communication system?
A.
The minimum sampling rate to avoid aliasing
B.
The maximum data rate achievable
C.
The frequency of the carrier wave
D.
The bandwidth of the communication channel
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Solution
The Nyquist rate is the minimum sampling rate required to avoid aliasing, which is twice the highest frequency of the signal.
Correct Answer: A — The minimum sampling rate to avoid aliasing
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Q. What is the Nyquist rate in communication systems?
A.
The minimum sampling rate to avoid aliasing
B.
The maximum frequency of the signal
C.
The bandwidth of the communication channel
D.
The maximum data rate of a channel
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Solution
The Nyquist rate is the minimum sampling rate required to avoid aliasing, which is twice the maximum frequency of the signal.
Correct Answer: A — The minimum sampling rate to avoid aliasing
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Q. What is the Nyquist rate in the context of signal sampling?
A.
The minimum sampling rate to avoid aliasing
B.
The maximum frequency of the signal
C.
The bandwidth of the signal
D.
The average power of the signal
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Solution
The Nyquist rate is defined as twice the maximum frequency of the signal, which is the minimum sampling rate required to avoid aliasing.
Correct Answer: A — The minimum sampling rate to avoid aliasing
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Q. What is the Nyquist rate?
A.
The minimum sampling rate to avoid aliasing
B.
The maximum frequency of a signal
C.
The bandwidth of a communication channel
D.
The rate of data transmission in a channel
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Solution
The Nyquist rate is the minimum sampling rate required to avoid aliasing, which is twice the maximum frequency of the signal.
Correct Answer: A — The minimum sampling rate to avoid aliasing
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Q. What is the output of a NAND gate when both inputs are high?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
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Solution
A NAND gate outputs 0 only when both inputs are 1. Therefore, if both inputs are high (1), the output is 0.
Correct Answer: A — 0
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Q. What is the output of a NAND gate when both inputs are true?
A.
True
B.
False
C.
Undefined
D.
Depends on the circuit
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Solution
A NAND gate outputs false when both inputs are true.
Correct Answer: B — False
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Q. What is the output of a NOR gate when both inputs are false?
A.
True
B.
False
C.
Both true
D.
Both false
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Solution
A NOR gate outputs true when both inputs are false.
Correct Answer: A — True
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Q. What is the output of a NOR gate when both inputs are low?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
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Solution
A NOR gate outputs 1 only when both inputs are 0. Therefore, if both inputs are low (0), the output is 1.
Correct Answer: B — 1
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Q. What is the output of a NOT gate when the input is 0?
A.
0
B.
1
C.
Undefined
D.
Depends on the circuit
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Solution
A NOT gate inverts the input. Therefore, NOT 0 = 1.
Correct Answer: B — 1
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Q. What is the output of a NOT gate when the input is true?
A.
True
B.
False
C.
Both True and False
D.
Undefined
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Solution
A NOT gate outputs false when the input is true.
Correct Answer: B — False
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Q. What is the output of an AND gate with inputs 0 and 1?
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Solution
An AND gate outputs 1 only when both inputs are 1. Since one input is 0, the output is 0.
Correct Answer: A — 0
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Q. What is the output of an AND gate with inputs A = 0 and B = 0?
A.
0
B.
1
C.
2
D.
Undefined
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Solution
An AND gate outputs 1 only when both inputs are high. Since both A and B are 0, the output is 0.
Correct Answer: A — 0
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Q. What is the output of an AND gate with inputs A = 0 and B = 1?
A.
0
B.
1
C.
2
D.
Undefined
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Solution
An AND gate outputs 1 only when both inputs are high. Since A = 0, the output is 0.
Correct Answer: A — 0
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Q. What is the output of an OR gate if one input is false and the other is true?
A.
True
B.
False
C.
Both True
D.
Both False
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Solution
An OR gate outputs true if at least one input is true.
Correct Answer: A — True
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Q. What is the output of an OR gate when both inputs are low?
A.
0
B.
1
C.
2
D.
Undefined
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Solution
An OR gate outputs 0 only when both inputs are low. Therefore, the output is 0.
Correct Answer: A — 0
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Q. What is the output of an XOR gate when both inputs are the same?
A.
True
B.
False
C.
Both True and False
D.
Undefined
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Solution
An XOR gate outputs false when both inputs are the same.
Correct Answer: B — False
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Q. What is the output of the expression NOT (A AND B) when A = 0 and B = 1?
A.
0
B.
1
C.
2
D.
Undefined
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Solution
A AND B = 0 AND 1 = 0. Therefore, NOT (0) = 1.
Correct Answer: B — 1
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Q. What is the phenomenon called when an electron transitions from a higher energy level to a lower energy level in an atom?
A.
Ionization
B.
Excitation
C.
Emission
D.
Absorption
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Solution
When an electron transitions from a higher energy level to a lower energy level, it releases energy in the form of a photon, a process known as emission.
Correct Answer: C — Emission
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Q. What is the phenomenon called when electrons are emitted from a metal surface when it is exposed to light?
A.
Photoelectric effect
B.
Compton effect
C.
Rayleigh scattering
D.
Black body radiation
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Solution
The emission of electrons from a metal surface when exposed to light is known as the photoelectric effect.
Correct Answer: A — Photoelectric effect
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Q. What is the photoelectric effect primarily used for in technology?
A.
Solar panels
B.
LEDs
C.
Lasers
D.
Television screens
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Solution
The photoelectric effect is primarily used in solar panels to convert light energy into electrical energy.
Correct Answer: A — Solar panels
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Q. What is the primary advantage of using digital signals over analog signals in communication systems?
A.
Higher bandwidth
B.
Less susceptibility to noise
C.
Easier to modulate
D.
Lower power consumption
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Solution
Digital signals are less susceptible to noise, making them more reliable for communication compared to analog signals.
Correct Answer: B — Less susceptibility to noise
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Q. What is the primary application of nuclear fusion in stars?
A.
Energy production
B.
Nuclear weapons
C.
Radioactive dating
D.
Medical imaging
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Solution
Nuclear fusion in stars primarily serves as a source of energy production, converting hydrogen into helium and releasing vast amounts of energy.
Correct Answer: A — Energy production
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Q. What is the primary charge carrier in n-type semiconductors?
A.
Holes
B.
Electrons
C.
Protons
D.
Neutrons
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Solution
In n-type semiconductors, electrons are the majority charge carriers due to the addition of donor impurities.
Correct Answer: B — Electrons
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Q. What is the primary charge carrier in P-type semiconductors?
A.
Electrons
B.
Holes
C.
Protons
D.
Neutrons
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Solution
In P-type semiconductors, holes are the primary charge carriers.
Correct Answer: B — Holes
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Q. What is the primary force that holds the nucleus of an atom together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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Q. What is the primary force that holds the nucleus together?
A.
Electromagnetic force
B.
Gravitational force
C.
Strong nuclear force
D.
Weak nuclear force
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Solution
The strong nuclear force is the primary force that holds the protons and neutrons together in the nucleus.
Correct Answer: C — Strong nuclear force
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