Atoms  MCQs

MCQs of Atoms

Showing 61 to 70 out of 146 Questions
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61.
X-rays are produced due to _____
(a) break up of molecules
(b) change in atomic energy levels
(c) change in the nuclear energy levels
(d) radioactive disintegration
Answer:

Option (b)

62.
Characteristics X-rays are not obtained in the spectrum of H-atom because _____
(a) hydrogen is a gas
(b) hydrogen is very light
(c) energy difference in energy levels of hydrogen is much less
(d) energy difference in energy levels of hydrogen is much high
Answer:

Option (c)

63.
The energy of characteristic X-ray photons obtained from Coolidge tube comes from _____
(a) kinetic energy of incident electron
(b) kinetic energy of free electrons of target material
(c) kinetic energy of ions of target material
(d) electron transition in target material
Answer:

Option (d)

64.
The order of energy of an X-rays photon is _____
(a) MeV
(b) keV
(c) eV
(d) GeV
Answer:

Option (b)

65.
If X-rays are passed through a strong magnetic field, then X-rays _____
(a) will deviate maximum
(b) will deviate minimum
(c) will be undeviated
(d) None of the above
Answer:

Option (c)

66.
An X-rays tube when operated at 60 kV, the reading of tube current is 50 mA. Assuming that the total energy of electron is converted into heat, the rate of heat produced at the anode in cal/s is about _____
(a) 100
(b) 300
(c) 500
(d) 714
Answer:

Option (d)

67.
Electron volt is the unit of _____ physical quanitiy.
(a) electric charge
(b) energy
(c) mass
(d) potential difference
Answer:

Option (b)

68.
An accelerated charge emits _____
(a) Charge
(b) Energy
(c) Heat
(d) Angular Momentum
Answer:

Option (b)

69.
The ratio of kinetic energy and the total energy of the electron in the n th quantum state of Bohr's atomic model of hydrogen atom is _____
(a) +2
(b) -2
(c) +1
(d) -1
Answer:

Option (d)

70.
The ratio of areas of the electron orbits for the first excited state and the ground state for the hydrogen atom is _____
(a) 8 : 1
(b) 4 : 1
(c) 2 : 1
(d) 16 : 1
Answer:

Option (d)

Showing 61 to 70 out of 146 Questions
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