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Objective Questions
GS
GS Set-1
Physics
Dual Nature of Radiation
64

Dual Nature of Radiation MCQ with Answers

64) In Thomson's method for finding specific charge of positive rays, the electric and magnetic fields are

parallel and simultaneous

Parallel and separate

Crossed and separate

crossed and simultaneous

Answer is:

Parallel and separate

Explanation:

In Thomson?s method for finding specific charge of positive rays, the electric and magnetic fields are Parallel and separate

Dual Nature of Radiation MCQ with Answers

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Related Dual Nature of Radiation MCQ with Answers

65) The specific charge for positive rays is much less than that for cathode rays. This is because

they are positively charged

experimental approach is defective

their masses are very large

their charge is very small

Answer is:

their masses are very large

Explanation:

The specific charge for positive rays is much less than that for cathode rays. This is because their masses are very large

66) The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is

10 V

Answer is:

4V

Explanation:

Use 1/2mv²_max=hv??_? and W=hV_o

67) A stream of electrons enters an electric field with?10⁷ms^?1?at right angle to it. If the strength of field is?3?10⁴V/m³, the magnetic field acting perpendicular to electric field for producing no deflection of the beam is

0.3??10^?3T

3.5??10^?3T

3??10^?3T

4??10^?3T

Answer is:

3??10^?3T

Explanation:

Use BeV=eE

68) A drop of radius one micron carries a charge of 4 electrons. If the density of oil is 2g/cc, the electric field required to balance it is

12.83??10⁴?V/m

13.83??10⁴?V/m

12.03??10⁴?V/m

14.83??10⁴?V/m

Answer is:

12.83??10⁴?V/m

Explanation:

Use BeV=eE

Dual Nature of Radiation MCQ with Answers

For more MCQ's Click Here

64) In Thomson's method for finding specific charge of positive rays, the electric and magnetic fields are

Parallel and separate

Dual Nature of Radiation MCQ with Answers

Related Dual Nature of Radiation MCQ with Answers

65) The specific charge for positive rays is much less than that for cathode rays. This is because

their masses are very large

66) The maximum kinetic energy of photoelectrons emitted from a surface when photons of energy 6 eV fall on it is 4 eV. The stopping potential is

4V

67) A stream of electrons enters an electric field with?107ms?1?at right angle to it. If the strength of field is?3?104V/m3, the magnetic field acting perpendicular to electric field for producing no deflection of the beam is

3??10?3T

68) A drop of radius one micron carries a charge of 4 electrons. If the density of oil is 2g/cc, the electric field required to balance it is

12.83??104?V/m

Dual Nature of Radiation MCQ with Answers

67) A stream of electrons enters an electric field with?10⁷ms^?1?at right angle to it. If the strength of field is?3?10⁴V/m³, the magnetic field acting perpendicular to electric field for producing no deflection of the beam is

3??10^?3T

12.83??10⁴?V/m