Modern Physics

Q. Which of the following is a characteristic of beta decay?
  • A. Emission of alpha particles
  • B. Conversion of a neutron into a proton
  • C. Emission of gamma rays
  • D. No change in atomic number
Q. Which of the following is a characteristic of digital communication systems?
  • A. Continuous signal representation
  • B. Higher susceptibility to noise
  • C. Easier encryption and security
  • D. Lower data transmission rates
Q. Which of the following is a characteristic of digital signals?
  • A. Continuous in nature
  • B. Discrete in nature
  • C. More susceptible to noise
  • D. Require more bandwidth than analog signals
Q. Which of the following is a characteristic of gamma radiation?
  • A. It has mass
  • B. It is positively charged
  • C. It has high penetrating power
  • D. It can be deflected by magnetic fields
Q. Which of the following is a characteristic of intrinsic semiconductors?
  • A. High conductivity
  • B. Temperature-dependent conductivity
  • C. Presence of impurities
  • D. Permanent charge carriers
Q. Which of the following is a characteristic of isotopes?
  • A. Same number of protons, different number of neutrons
  • B. Different number of protons, same number of neutrons
  • C. Same mass number
  • D. Different chemical properties
Q. Which of the following is a common application of digital modulation?
  • A. Television broadcasting
  • B. AM radio
  • C. Satellite communication
  • D. Analog audio transmission
Q. Which of the following is a common application of Phase Shift Keying (PSK)?
  • A. Television broadcasting
  • B. Satellite communication
  • C. AM radio
  • D. FM radio
Q. Which of the following is a disadvantage of frequency modulation (FM) compared to amplitude modulation (AM)?
  • A. Higher bandwidth requirement
  • B. More susceptible to noise
  • C. Lower fidelity
  • D. Easier to demodulate
Q. Which of the following is a disadvantage of Frequency Modulation (FM)?
  • A. Less bandwidth
  • B. More noise immunity
  • C. Complex receiver design
  • D. Simple implementation
Q. Which of the following is a universal gate?
  • A. AND
  • B. OR
  • C. NAND
  • D. XOR
Q. Which of the following is NOT a type of digital modulation?
  • A. Amplitude Shift Keying (ASK)
  • B. Frequency Shift Keying (FSK)
  • C. Phase Shift Keying (PSK)
  • D. Continuous Wave Modulation (CWM)
Q. Which of the following is the output of the expression NOT (A AND B) when A = 1 and B = 1?
  • A. 0
  • B. 1
  • C. 2
  • D. Undefined
Q. Which of the following is the truth table for an AND gate?
  • A. 00, 01, 10, 11
  • B. 00, 01, 11, 10
  • C. 00, 10, 01, 11
  • D. 00, 11, 01, 10
Q. Which of the following materials is commonly used as a p-type semiconductor?
  • A. Silicon
  • B. Germanium
  • C. Gallium Arsenide
  • D. Boron-doped Silicon
Q. Which of the following materials is commonly used as a semiconductor?
  • A. Copper
  • B. Silicon
  • C. Aluminum
  • D. Iron
Q. Which of the following orbitals is the highest in energy?
  • A. 3s
  • B. 3p
  • C. 4s
  • D. 3d
Q. Which of the following particles has the smallest mass?
  • A. Proton
  • B. Neutron
  • C. Electron
  • D. Alpha particle
Q. Which of the following particles is emitted during beta decay?
  • A. Alpha particle
  • B. Beta particle
  • C. Gamma ray
  • D. Neutron
Q. Which of the following particles is not a baryon?
  • A. Proton
  • B. Neutron
  • C. Pion
  • D. Lambda particle
Q. Which of the following particles is not a constituent of the nucleus?
  • A. Proton
  • B. Neutron
  • C. Electron
  • D. Alpha particle
Q. Which of the following particles is not a nucleon?
  • A. Proton
  • B. Neutron
  • C. Electron
  • D. Alpha particle
Q. Which of the following particles is not found in the nucleus of an atom?
  • A. Proton
  • B. Neutron
  • C. Electron
  • D. Alpha particle
Q. Which of the following particles is not found in the nucleus?
  • A. Proton
  • B. Neutron
  • C. Electron
  • D. Alpha particle
Q. Which of the following phenomena can be explained by the wave nature of light?
  • A. Photoelectric effect
  • B. Compton effect
  • C. Interference
  • D. Electron diffraction
Q. Which of the following phenomena demonstrates the wave-particle duality of light?
  • A. Photoelectric effect
  • B. Compton effect
  • C. Diffraction
  • D. All of the above
Q. Which of the following quantum numbers cannot be the same for two electrons in the same atom?
  • A. Principal quantum number
  • B. Azimuthal quantum number
  • C. Magnetic quantum number
  • D. Spin quantum number
Q. Which of the following quantum numbers describes the orientation of an orbital?
  • A. Principal quantum number
  • B. Azimuthal quantum number
  • C. Magnetic quantum number
  • D. Spin quantum number
Q. Which of the following statements about isotopes is true?
  • A. Isotopes have the same number of protons
  • B. Isotopes have different chemical properties
  • C. Isotopes have different numbers of protons
  • D. Isotopes are always radioactive
Q. Which of the following statements about the Bohr model of the atom is correct?
  • A. Electrons can exist in any orbit
  • B. Electrons emit radiation in stable orbits
  • C. Energy levels are quantized
  • D. All orbits are elliptical
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