Modern Physics

Q. In a diode, what is the region called where no charge carriers are present?
  • A. Conduction band
  • B. Valence band
  • C. Depletion region
  • D. N-type region
Q. In a diode, what is the region called where no current flows?
  • A. Forward bias
  • B. Reverse bias
  • C. Depletion region
  • D. Conduction region
Q. In a hydrogen atom, the energy levels are quantized. What is the formula for the energy of the nth level?
  • A. E_n = -13.6/n^2 eV
  • B. E_n = -13.6n^2 eV
  • C. E_n = -13.6/n eV
  • D. E_n = -13.6n eV
Q. In a hydrogen atom, what is the energy of the electron in the ground state?
  • A. -13.6 eV
  • B. -3.4 eV
  • C. -1.51 eV
  • D. 0 eV
Q. In a hydrogen atom, what is the energy of the electron in the n=2 state?
  • A. -3.4 eV
  • B. -13.6 eV
  • C. -1.51 eV
  • D. -0.85 eV
Q. In a hydrogen atom, what is the wavelength of the emitted photon when an electron transitions from n=3 to n=2?
  • A. 656 nm
  • B. 486 nm
  • C. 434 nm
  • D. 410 nm
Q. In a hydrogen atom, which transition emits the photon with the highest energy?
  • A. n=2 to n=1
  • B. n=3 to n=2
  • C. n=4 to n=3
  • D. n=5 to n=4
Q. In a hydrogen atom, which transition would emit the highest energy photon?
  • A. n=2 to n=1
  • B. n=3 to n=2
  • C. n=4 to n=3
  • D. n=5 to n=4
Q. In a hydrogen atom, which transition would emit the photon with the highest energy?
  • A. n=2 to n=1
  • B. n=3 to n=2
  • C. n=4 to n=3
  • D. n=5 to n=4
Q. In a nuclear reaction, what is conserved?
  • A. Mass only
  • B. Charge only
  • C. Mass and charge
  • D. Energy only
Q. In a nuclear reaction, what is the term for the energy released when a nucleus is formed from its constituent nucleons?
  • A. Binding energy
  • B. Kinetic energy
  • C. Potential energy
  • D. Thermal energy
Q. In a nuclear reaction, what is the term for the energy released?
  • A. Kinetic energy
  • B. Potential energy
  • C. Binding energy
  • D. Nuclear energy
Q. In a nuclear reaction, what is the term for the mass difference between the reactants and products?
  • A. Mass defect
  • B. Binding energy
  • C. Nuclear fusion
  • D. Nuclear fission
Q. In a p-n junction diode, what happens when it is forward biased?
  • A. Depletion region widens
  • B. Current flows easily
  • C. No current flows
  • D. Reverse breakdown occurs
Q. In a p-n junction diode, what happens when it is reverse-biased?
  • A. Current flows freely
  • B. Depletion region widens
  • C. Holes move towards the n-side
  • D. Electrons move towards the p-side
Q. In a p-n junction, what is formed at the junction region?
  • A. Electric field
  • B. Magnetic field
  • C. Thermal field
  • D. Gravitational field
Q. In a p-n junction, what is the region called where no charge carriers are present?
  • A. Depletion region
  • B. Conduction band
  • C. Valence band
  • D. Neutral zone
Q. In a p-n junction, what is the region called where no charge carriers exist?
  • A. Depletion region
  • B. Conduction band
  • C. Valence band
  • D. Neutral zone
Q. In a photoelectric experiment, if the frequency of light is just above the threshold frequency, what can be said about the emitted electrons?
  • A. They have maximum kinetic energy
  • B. They are emitted with zero kinetic energy
  • C. They are emitted with high kinetic energy
  • D. No electrons are emitted
Q. In a photoelectric experiment, if the stopping potential is increased, what does it indicate about the emitted electrons?
  • A. They have higher kinetic energy
  • B. They have lower kinetic energy
  • C. They are emitted at a lower rate
  • D. They are not emitted
Q. In a photoelectric experiment, if the stopping potential is increased, what happens to the current?
  • A. It increases
  • B. It decreases
  • C. It remains constant
  • D. It becomes zero
Q. In a photoelectric experiment, if the stopping potential is increased, what happens to the energy of the emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes negative
Q. In a photoelectric experiment, if the stopping potential is increased, what happens to the maximum kinetic energy of the emitted electrons?
  • A. It increases
  • B. It decreases
  • C. It remains the same
  • D. It becomes zero
Q. In a semiconductor, what is the term for the energy required to move an electron from the valence band to the conduction band?
  • A. Ionization energy
  • B. Band gap energy
  • C. Thermal energy
  • D. Activation energy
Q. In amplitude modulation (AM), what does the amplitude of the carrier wave represent?
  • A. The frequency of the modulating signal
  • B. The phase of the modulating signal
  • C. The information signal
  • D. The power of the carrier wave
Q. In amplitude modulation (AM), what does the carrier wave represent?
  • A. The information signal
  • B. The frequency of the modulated signal
  • C. The average power of the signal
  • D. The high-frequency signal that carries the information
Q. In beta decay, which particle is emitted from the nucleus?
  • A. Alpha particle
  • B. Beta particle
  • C. Gamma ray
  • D. Neutron
Q. In digital communication, what does the term 'bit rate' refer to?
  • A. The number of bits transmitted per second
  • B. The number of bits stored in a device
  • C. The number of bits in a signal
  • D. The number of bits required for modulation
Q. In nuclear fission, what is released apart from energy?
  • A. Neutrons
  • B. Protons
  • C. Electrons
  • D. Photons
Q. In nuclear fission, what is the primary product of the reaction?
  • A. Helium
  • B. Neutrons
  • C. Protons
  • D. Alpha particles
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