Physics Practice MCQ Page 46

Multiple Choice questions for Physics in the sets of 10 each on one page with questions and answers. All sets are useful in the preparation of subject tests for employment or admission.
Question: 4008   Rutherford's experiment on the atom demonstrated
  1. the presence of neutrons inside and atom
  2. the approximate size of the atom
  3. the approximate size of a nucleus
  4. the revolving of electrons in atomic orbits
Question: 4009   Which one of the following statements regarding photo-emission of electrons is correct?
  1. Kinetic energy of electrons increases with the intensity of incident light
  2. Electrons are emitted when the wavelength of the incident light is above a certain threshold
  3. photoelectric emission is instantaneous with the incidence of light
  4. photo electrons are emitted whenever a gas is irradiated with ultraviolet light
Question: 4010   The quanitiy h/m0c, with m0 as the electron mass, has the dimensions of
  1. length
  2. time
  3. mass
  4. temperature
Question: 4011   Forces binding neutrons and protons
  1. vary in versely as r2
  2. vary inversely as r4
  3. act upto a certain point and then become zero
  4. are responsible for the energy released during nuclear fission
Question: 4012   The energy of 1.6 Joule is equal to
  1. 1019 MeV
  2. 1013 MeV
  3. 106 MeV
  4. 1.0 MeV
Question: 4013   the avalanche breakdown in a p-n junction is due to
  1. shift of Fermi level
  2. cumulative effect of conduction band electron collision
  3. widening of forbidden gap
  4. high impurity concentration
Question: 4014   The thermonuclear fusion of hydrogen inside the stars is taking place by a cycle of operations. the particular element which acts as a catalyst, is
  1. nitrogen
  2. oxygen
  3. carbon
  4. helium
Question: 4015   A p-n diode is reverse biased. the resistance measured by an ohm meter connected across it will be
  1. zero
  2. low
  3. high
  4. infinite
Question: 4016   The cathode ray particles originate in a discharge tube from the
  1. cathode
  2. anode
  3. source of high voltage
  4. residual gas
Question: 4017   When a certain metallic surface is irradiated with monochromatic light of wavelength λ, the stopping potential for photoelectric current is 3V0. When the same surface is irradiated with light of wavelength 2λ, the stopping potential is V0. the threshold wavelength for the given surface is
  1. 4λ
  2. 6λ
  3. 8λ
  4. 4λ/3
Question: 4018   The angular momentum of the α-particles which are scattered through large angles by the heavier nuclei, is conserved because of the
  1. nature of the repulsive forces
  2. conservation of linear momentum
  3. conservation of kinetic energy
  4. conservation of total energy
Question: 4019   An X-ray tube is operating at 15 KV. The lower limit of the wavelength of X-rays produced is
  1. 0.82 × 10-7 m
  2. 0.82 × 10-8 m
  3. 0.82 × 10-10 m
  4. 0.82 × 10-13 m

Answers to the questions of Physics on this page

Following list gives the correct choice for the answer of the Physics mcqs.
4008 . C       4009 . D       4010 . A       4011 . D       4012 . B       4013 . B       4014 . D       4015 . C       4016 . A       4017 . A       4018 . D       4019 . C      

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