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Published on: 02/09/2022
QB365 provides a detailed and simple solution for every Possible Creative Questions in Class 12 Physics Subject - Retirement and Death of a Partner, English Medium. It will help Students to get more practice questions, Students can Practice these question papers in addition to score best marks.
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
According to Einstein's photoelectric equation the graph between the K.E of photoelectrons ejected and the frequency of incident radiation is ____________.
2.
A photon of frequency v has a momentum associated with it. If c is the velocity of light the momentum is _____________.
\(\frac{v}{c}\)
hvc
\(\frac { hv }{ { c }^{ 2 } } \)
\(\frac { hv }{ c } \)
3.
A charged oil drop is suspended in a uniform field of 3 x 104 Vm-1 so that it neither falls nor rises. The charge on the drop will be _____________.
3.3 x 10-18C
3.2 x 10-18C
1.6 x 10-18C
4.8 x 10-18C
4.
According to Einstein's photoelectric equation the plot of the K.E of the emitted photoelectrons from a metal vs the frequency of incident radiation gives a straight line where slope ____________.
depends on the nature of the metal used
depends on the intensity of the radiation
both a & b
Depends on neither a or b
5.
The anode plate in an experiment on photoelectric effect is kept vertically above the emitter plate. Light source is put on. An electric field is switched on which has vertically downward direction.
The photo current will increase
The kinetic energy of the electrons will increase
The stopping potential will decrease
The transhold wavelength will increase
6.
The photo current in an experiment on photoelectric effect increases if ____________.
the intensity of the source is increased
the exposure time is increased
the intensity of the source is decreased
the exposure time is decreased
7.
If the wavelength of light in an except on photoelectric effect is doubled ________________.
the photoelectric emission will not take place
the photoelectric emission may not take place
the stopping potential will increase
the stopping potential will decrease
8.
A photon of energy hv is absorbed by a free electrons of a metal having work function ф < hv _____________.
The electron is sure to come out
The electron is sure to come out with a kinetic energy ф < hv
Either the electron does not come out or it comes out with kinetic energy hv - ф
It may come out with a kinetic energy less than hv - ф
9.
Photo electron effect supports quantum nature of light because ___________.
there is a minimum frequency which no photo electrons are emitted
the maximum kinetic energy of photo electrons depends only one the frequency of light and not in intensity
even when the metal surface is faintly illuminated the photoelectrons leave the surface immedietly
All the above
10.
When the intensity of a light source is increased?
the number of photons emitted by the source in unit time increases
more energetic photons are emitted
faster photons are emitted
total energy of the photons emitted per unit time decreases.
11.
Light of wavelength falls on a metal having work function \(\frac { { h }_{ c } }{ { \lambda }_{ 0 } } \). Photo electric effect will place only if __________.
λ ≥ λ0
λ ≥ 2λ0
λ ≤ λ0
λ < λ0/2
12.
If the frequency of light in a photo electron experiment is doubled the stopping potential will ______________.
be doubled
be halved
become more than double
become less than double.
13.
When stopping potential is applied in an experiment on the photoelectric effect no photocurrent is observed. This means that ______________.
The emission of photoelectrons is stopped
The photoelectrons are emitted but are reabsorbed by the emitter metal
The photo electrons are accumulated near the collector plate
The photoelectrons are dispersed from the sides of the apparatus
14.
The work function of a metal is hv0. Light of frequency v falls on this metal. The photoelectric effect will take place only if ___________.
v \(\geq\) v0
v > 2vo
vo
v > vo/2
15.
P and E denote the linear momentum and energy of a photon. If the wavelength is decreased ____________.
Both P and E increase
P increases and E decreases
P decreases and E increases
both P & E decrease
1.
(b)
2.
(c)
\(\frac { hv }{ { c }^{ 2 } } \)
3.
(a)
3.3 x 10-18C
4.
(d)
Depends on neither a or b
5.
(b)
The kinetic energy of the electrons will increase
6.
(a)
the intensity of the source is increased
7.
(d)
the stopping potential will decrease
8.
(d)
It may come out with a kinetic energy less than hv - ф
9.
(a)
there is a minimum frequency which no photo electrons are emitted
10.
(a)
the number of photons emitted by the source in unit time increases
11.
(c)
λ ≤ λ0
12.
(c)
become more than double
13.
(b)
The photoelectrons are emitted but are reabsorbed by the emitter metal
14.
(a)
v \(\geq\) v0
15.
(a)
Both P and E increase
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Tamilnadu Stateboard 12th Standard Subjects
Maths
Chemistry
Physics
Biology
Computer Science
Business Maths and Statistics
Economics
Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
Economics
Maths
Chemistry
Physics
Computer Technology
History
Accountancy
Tamil
English
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