Modern Physics
Q. Which of the following is a characteristic of beta decay?
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A.
Emission of alpha particles
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B.
Conversion of a neutron into a proton
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C.
Emission of gamma rays
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D.
No change in atomic number
Solution
In beta decay, a neutron is converted into a proton, resulting in an increase in atomic number by one.
Correct Answer: B — Conversion of a neutron into a proton
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Q. Which of the following is a characteristic of digital communication systems?
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A.
Continuous signal representation
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B.
Higher susceptibility to noise
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C.
Easier encryption and security
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D.
Lower data transmission rates
Solution
Digital communication systems allow for easier encryption and security measures compared to analog systems.
Correct Answer: C — Easier encryption and security
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Q. Which of the following is a characteristic of digital signals?
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A.
Continuous in nature
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B.
Discrete in nature
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C.
More susceptible to noise
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D.
Require more bandwidth than analog signals
Solution
Digital signals are discrete in nature, representing data in binary form, which makes them less susceptible to noise compared to analog signals.
Correct Answer: B — Discrete in nature
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Q. Which of the following is a characteristic of gamma radiation?
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A.
It has mass
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B.
It is positively charged
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C.
It has high penetrating power
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D.
It can be deflected by magnetic fields
Solution
Gamma radiation is a form of electromagnetic radiation with high penetrating power and no mass or charge.
Correct Answer: C — It has high penetrating power
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Q. Which of the following is a characteristic of intrinsic semiconductors?
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A.
High conductivity
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B.
Temperature-dependent conductivity
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C.
Presence of impurities
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D.
Permanent charge carriers
Solution
Intrinsic semiconductors have conductivity that is highly dependent on temperature, as they have no impurities.
Correct Answer: B — Temperature-dependent conductivity
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Q. Which of the following is a characteristic of isotopes?
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A.
Same number of protons, different number of neutrons
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B.
Different number of protons, same number of neutrons
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C.
Same mass number
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D.
Different chemical properties
Solution
Isotopes have the same number of protons but different numbers of neutrons.
Correct Answer: A — Same number of protons, different number of neutrons
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Q. Which of the following is a common application of digital modulation?
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A.
Television broadcasting
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B.
AM radio
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C.
Satellite communication
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D.
Analog audio transmission
Solution
Digital modulation is commonly used in satellite communication.
Correct Answer: C — Satellite communication
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Q. Which of the following is a common application of Phase Shift Keying (PSK)?
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A.
Television broadcasting
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B.
Satellite communication
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C.
AM radio
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D.
FM radio
Solution
Phase Shift Keying (PSK) is commonly used in satellite communication.
Correct Answer: B — Satellite communication
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Q. Which of the following is a disadvantage of frequency modulation (FM) compared to amplitude modulation (AM)?
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A.
Higher bandwidth requirement
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B.
More susceptible to noise
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C.
Lower fidelity
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D.
Easier to demodulate
Solution
FM requires a larger bandwidth than AM, which can be a disadvantage in certain communication systems.
Correct Answer: A — Higher bandwidth requirement
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Q. Which of the following is a disadvantage of Frequency Modulation (FM)?
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A.
Less bandwidth
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B.
More noise immunity
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C.
Complex receiver design
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D.
Simple implementation
Solution
FM requires a more complex receiver design compared to AM.
Correct Answer: C — Complex receiver design
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Q. Which of the following is a universal gate?
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A.
AND
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B.
OR
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C.
NAND
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D.
XOR
Solution
The NAND gate is a universal gate because it can be used to create any other gate.
Correct Answer: C — NAND
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Q. Which of the following is NOT a type of digital modulation?
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A.
Amplitude Shift Keying (ASK)
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B.
Frequency Shift Keying (FSK)
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C.
Phase Shift Keying (PSK)
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D.
Continuous Wave Modulation (CWM)
Solution
Continuous Wave Modulation (CWM) is not a type of digital modulation; it refers to analog modulation techniques.
Correct Answer: D — Continuous Wave Modulation (CWM)
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Q. Which of the following is the output of the expression NOT (A AND B) when A = 1 and B = 1?
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A.
0
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B.
1
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C.
2
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D.
Undefined
Solution
First, evaluate A AND B which is 1 AND 1 = 1. Then NOT 1 = 0.
Correct Answer: A — 0
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Q. Which of the following is the truth table for an AND gate?
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A.
00, 01, 10, 11
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B.
00, 01, 11, 10
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C.
00, 10, 01, 11
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D.
00, 11, 01, 10
Solution
The truth table for an AND gate is: 00 -> 0, 01 -> 0, 10 -> 0, 11 -> 1.
Correct Answer: A — 00, 01, 10, 11
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Q. Which of the following materials is commonly used as a p-type semiconductor?
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A.
Silicon
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B.
Germanium
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C.
Gallium Arsenide
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D.
Boron-doped Silicon
Solution
Boron-doped Silicon is a common p-type semiconductor as boron creates holes in the silicon lattice.
Correct Answer: D — Boron-doped Silicon
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Q. Which of the following materials is commonly used as a semiconductor?
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A.
Copper
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B.
Silicon
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C.
Aluminum
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D.
Iron
Solution
Silicon is widely used as a semiconductor material due to its suitable band gap and availability.
Correct Answer: B — Silicon
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Q. Which of the following orbitals is the highest in energy?
Solution
The 3d orbital is higher in energy than the 4s orbital due to its shape and electron repulsion.
Correct Answer: D — 3d
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Q. Which of the following particles has the smallest mass?
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A.
Proton
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B.
Neutron
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C.
Electron
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D.
Alpha particle
Solution
Among the given particles, the electron has the smallest mass, approximately 1/1836 of a proton.
Correct Answer: C — Electron
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Q. Which of the following particles is emitted during beta decay?
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A.
Alpha particle
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B.
Beta particle
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C.
Gamma ray
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D.
Neutron
Solution
Beta decay involves the emission of beta particles, which are electrons or positrons.
Correct Answer: B — Beta particle
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Q. Which of the following particles is not a baryon?
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A.
Proton
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B.
Neutron
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C.
Pion
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D.
Lambda particle
Solution
Pions are mesons, not baryons. Baryons are particles made up of three quarks, while mesons are made up of a quark and an antiquark.
Correct Answer: C — Pion
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Q. Which of the following particles is not a constituent of the nucleus?
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A.
Proton
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B.
Neutron
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C.
Electron
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D.
Alpha particle
Solution
Electrons are not constituents of the nucleus; they orbit around the nucleus, while protons and neutrons are found within it.
Correct Answer: C — Electron
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Q. Which of the following particles is not a nucleon?
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A.
Proton
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B.
Neutron
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C.
Electron
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D.
Alpha particle
Solution
An electron is not a nucleon; nucleons are particles found in the nucleus, which include protons and neutrons.
Correct Answer: C — Electron
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Q. Which of the following particles is not found in the nucleus of an atom?
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A.
Proton
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B.
Neutron
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C.
Electron
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D.
Alpha particle
Solution
Electrons are not found in the nucleus; they orbit around the nucleus, while protons and neutrons are the constituents of the nucleus.
Correct Answer: C — Electron
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Q. Which of the following particles is not found in the nucleus?
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A.
Proton
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B.
Neutron
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C.
Electron
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D.
Alpha particle
Solution
Electrons are not found in the nucleus; they orbit around it.
Correct Answer: C — Electron
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Q. Which of the following phenomena can be explained by the wave nature of light?
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A.
Photoelectric effect
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B.
Compton effect
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C.
Interference
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D.
Electron diffraction
Solution
Interference is a phenomenon that can be explained by the wave nature of light, as it involves the superposition of light waves.
Correct Answer: C — Interference
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Q. Which of the following phenomena demonstrates the wave-particle duality of light?
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A.
Photoelectric effect
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B.
Compton effect
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C.
Diffraction
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D.
All of the above
Solution
All of the mentioned phenomena (photoelectric effect, Compton effect, and diffraction) demonstrate the wave-particle duality of light.
Correct Answer: D — All of the above
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Q. Which of the following quantum numbers cannot be the same for two electrons in the same atom?
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A.
Principal quantum number
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B.
Azimuthal quantum number
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C.
Magnetic quantum number
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D.
Spin quantum number
Solution
According to the Pauli Exclusion Principle, no two electrons in an atom can have the same set of all four quantum numbers.
Correct Answer: D — Spin quantum number
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Q. Which of the following quantum numbers describes the orientation of an orbital?
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A.
Principal quantum number
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B.
Azimuthal quantum number
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C.
Magnetic quantum number
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D.
Spin quantum number
Solution
The magnetic quantum number describes the orientation of an orbital in space.
Correct Answer: C — Magnetic quantum number
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Q. Which of the following statements about isotopes is true?
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A.
Isotopes have the same number of protons
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B.
Isotopes have different chemical properties
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C.
Isotopes have different numbers of protons
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D.
Isotopes are always radioactive
Solution
Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.
Correct Answer: A — Isotopes have the same number of protons
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Q. Which of the following statements about the Bohr model of the atom is correct?
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A.
Electrons can exist in any orbit
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B.
Electrons emit radiation in stable orbits
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C.
Energy levels are quantized
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D.
All orbits are elliptical
Solution
In the Bohr model, energy levels are quantized, meaning electrons can only exist in specific energy states.
Correct Answer: C — Energy levels are quantized
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