JEE Physics Dual Nature Of Radiation and Matter MCQs Set B

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MCQ for Full Syllabus Physics Dual Nature Of Radiation and Matter

Full Syllabus Physics students should refer to the following multiple-choice questions with answers for Dual Nature Of Radiation and Matter in Full Syllabus.

Dual Nature Of Radiation and Matter MCQ Questions Full Syllabus Physics with Answers

 

 

Question: For an electron microscope, which of the following is false?

  • a) Its resolving power is directly proportional to accelerating potential of electrons
  • b) It uses magnetic lens to converge electron beam
  • c) Its resolving power is inversely proportional to wavelength of electrons
  • d) Magnification attained with the help of it is of the order of 106

Answer: Its resolving power is directly proportional to accelerating potential of electrons

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: The approximate wavelength of a photon of energy 2.48 eV is

  • a) 5000 Å
  • b) 2000 Å
  • c) 1000 Å
  • d) 500 Å

Answer: 5000 Å

 

Question: Wavelength of a 1 keV photon is 1.24 × 10–9 m. What is the frequency of 1 MeV photon?

  • a) 2.4 × 1020 Hz
  • b) 1.24 × 1018 Hz
  • c) 2.4 × 1023 Hz
  • d) 1.24 × 1015 Hz

Answer: 2.4 × 1020 Hz

 

Question:

  • a)

  • b)

  • c) 2 eV
  • d) 1 eV

Answer:

 

Question: Which of the following statements is not correct?

  • a) Infrared photons have more energy than photons of visible light
  • b) Photographic plates are sensitive to infrared rays
  • c) Infrared rays are invisible but can cast shadows like visible light
  • d) Photographic plates are sensitive to ultraviolet rays

Answer: Photographic plates are sensitive to infrared rays

 

Question: Ultraviolet radiations of 6.2 eV fall on an aluminium surface (work function 4.2 eV). The kinetic energy (in joule) of the fastest electron emitted is approximately

  • a) 3.2 × 10–19
  • b) 3.2 × 10–21
  • c) 3.2 × 10–17
  • d) 3.2 × 10–15

Answer: 3.2 × 10–19

 

Question: The work function of a metallic surface is 5.01 eV. The photo electrons are emitted when light of wavelength 2000 Å falls on it. The potential difference applied to stop the fastest photo electrons is [h = 4.14 × 10–15 eV s]

  • a) 1.2 volt
  • b) 2.24 volt
  • c) 3.6 volt
  • d) 4.8 volt

Answer: 1.2 volt

 

Question: A radio transmitter operates at a frequency of 880 kHz and a power of 10 kW. The number of photons emitted per second is

  • a) 1.72 × 1031
  • b) 1.327 × 1034
  • c) 13.27 × 1034
  • d) 0.075 × 10–34

Answer: 1.72 × 1031

 

Question:

  • a)

  • b)

  • c) 2
  • d) 4

Answer: 

 

Question:

  • a) Product of slope on the line and charge on the electron
  • b) Slope of the line
  • c) Product of intercept along Y-axis and mass of the electron
  • d) Product of slope and mass of electron

Answer: Product of slope on the line and charge on the electron

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: Specific heat of water is 4.2 J/g°C. If light of frequency 3 × 109 Hz is used to heat 400 gm of water from 20°C to 40°C, the number of photons needed will be

  • a) 1.69 × 1028
  • b) 2.80 × 104
  • c) 2.80 × 105
  • d) 1.69 × 1029

Answer: 1.69 × 1028

 

Question: The work function of a certain metal is 2.3 eV. If light of wave number 2 × 106 m–1 falls on it, the kinetic energies of fastest and slowest ejected electron will be respectively

  • a) 0.18 eV, zero
  • b) 2.30 eV, 0.18 eV
  • c) 0.18 eV, 0.18 eV
  • d) 2.48 eV, 0.18 eV

Answer: 0.18 eV, zero

 

Question: When the electromagnetic radiations of frequencies 4 × 1015 Hz and 6 × 1015 Hz fall on the same metal in different experiments, the ratio of maximum kinetic energy of electrons liberated is 1 : 3. The threshold frequency for the metal is

  • a) 1 × 1015 Hz
  • b) 2 × 1015 Hz
  • c) 3 × 1015 Hz
  • d) 1.67 × 1015 Hz

Answer:  1 × 1015 Hz

 

Question: How many photons are emitted by a laser source of 5 × 10–3 W operating at 632.2 nm in 2 s? (h = 6.63 × 10–34 Js)

  • a) 3.2 × 101.6 × 1016
  • b) 1.6 × 1016
  • c) 4 × 1016
  • d) 0.4 × 1016

Answer:  3.2 × 101.6 × 1016

 

Question:

  • a)

  • b)

  • c)

  • d) Metal 1 may be gold and metal 2 may be cesium

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a)

  • b)

  • c) E
  • d) Eº

Answer:

 

Question: Violet light is falling on a photosensitive material causing ejection of photoelectrons with maximum kinetic energy of 1 eV. Red light falling on metal will cause emission of photoelectrons with maximum kinetic energy (approxim ately) equal to

  • a) Zero, that is no photoemission
  • b) 0.5 eV
  • c) 0.9 eV
  • d) 1.2 eV

Answer: Zero, that is no photoemission

 

More Questions...................................

 

Question: For a proton accelerated through potential difference of one volt, kinetic energy gained in eV is

  • a) 1
  • b) 1840
  • c)

  • d) 931.5 × 10–6

Answer: 1

 

Question: If frequency of light falling on a photosensitive material doubles

  • a) Cut-off voltage becomes more than double
  • b) Stopping potential doubles
  • c) Saturation photocurrent becomes more than double
  • d) Saturation photocurrent doubled

Answer: Cut-off voltage becomes more than double

 

Question: Photoelectrons from metal do not come out with same energy. Most appropriate explanation is

  • a) Electrons in metal occupy different energy levels and work function is the minimum energy required for electron in highest level of conduction band to get out of metal
  • b) For some electrons, some part of energy gained during inelastic collision with photon is spent in over coming attractive force by nucleus
  • c) Work function of a metal is average energy required to pull out electrons
  • d) Some electrons loose energy in form of heat

Answer: Electrons in metal occupy different energy levels and work function is the minimum energy required for electron in highest level of conduction band to get out of metal

 

Question: For an alpha particle, accelerated through a potential difference V, wavelength (in Å) of the associated matter wave is

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: Which one among the following shows particle nature of light?

  • a) Photoelectric effect
  • b) Refraction
  • c) Interference
  • d) Polarization

Answer: Photoelectric effect

 

Question: Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is

  • a) 1 : 2
  • b) 1 : 4
  • c) 1 : 1
  • d) 1 : 5

Answer: 1 : 2

 

Question: In photoelectric emission process from a metal of work function 1.8 eV, the kinetic energy of most energetic electrons is 0.5 eV. The corresponding stopping potential is

  • a) 0.5 V
  • b) 1.3 V
  • c) 1.8 V
  • d) 2.3 V

Answer: 0.5 V

 

Question:

  • a)

  • b) h
  • c) eh
  • d) e

Answer:

 

Question: Photoelectric emission occurs only when the incident light has more than a certain minimum

  • a) Frequency
  • b) Power
  • c) Wavelength
  • d) Intensity

Answer: Frequency

 

Question: The threshold frequency for a photosensitive metal is 3.3 × 1014 Hz. If light of frequency 8.5 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectric emission is nearly

  • a) 2 V
  • b) 1 V
  • c) 5 V
  • d) 3 V

Answer: 2 V

 

Question: An electron in the hydrogen atom jumps from excited state n to the ground state. The wavelength so emitted illuminates a photosensitive material having work function 2.75 eV. If the stopping potential of the photoelectron is 10 V, then the value of n is

  • a) 4
  • b) 3
  • c) 2
  • d) 5

Answer: 4

 

Question: The maximum kinetic energy of the photoelectrons varies

  • a) Linearly with the frequency and is independent of the intensity of the incident radiation
  • b) Linearly with the frequency and the intensity of the incident radiation
  • c) Inversely with the frequency and is independent of the intensity of the incident radiation
  • d) Inversely with the intensity and is independent of the frequency of the incident radiation

Answer: Linearly with the frequency and is independent of the intensity of the incident radiation

 

Question: The work function for Al, K and Pt is 4.28 eV, 2.30 eV and 5.65 eV respectively. Their respective threshold frequencies would be

  • a) Pt > Al > K
  • b) Al > Pt > K
  • c) K > Al > Pt
  • d) Al > K > Pt

Answer: Pt > Al > K

 

Question: The work function of a surface of a photosensitive material is 6.2 eV. The wavelength of the incident radiation for which the stopping potential is 5 V lies in the

  • a) Ultraviolet region
  • b) Visible region
  • c) Infrared region
  • d) X-ray region

Answer: Ultraviolet region

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question:

  • a)

  • b)

  • c)

  • d)

Answer:

 

Question: Which of the following statement is correct?

  • a) The photocurrent increases with intensity of light
  • b) The stopping potential increases with increase in intensity of incident light
  • c) The current in photocell increases with increasing frequency
  • d) The photocurrent is proportional to the applied voltage

Answer: The photocurrent increases with intensity of light

 

Question: Light of wavelength 5000 Å falls on a sensitive plate with photoelectric work function of 1.9 eV. The kinetic energy of the photoelectron emitted will be

  • a) 0.58 eV
  • b) 1.16 eV
  • c) 2.48 eV
  • d) 1.24 eV

Answer:  0.58 eV

 

Question:

  • a) Greater than v(4/3)1/2
  • b) v(3/4)1/2
  • c) v(4/3)1/2
  • d) Less than v(4/3)1/2

Answer: Greater than v(4/3)1/2

 

Question: The photoelectric work function for a metal surface is 4.125 eV. The cut-off wavelength for this surface is about

  • a) 3000 Å
  • b) 2062.5 Å
  • c) 6000 Å
  • d) 4125 Å

Answer: 3000 Å

 

MCQs for Dual Nature Of Radiation and Matter Physics Full Syllabus

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