Order Photoelectric Effect Assignment

Order Photoelectric Effect Assignment
Order 5698456
Order Photoelectric Effect Assignment
1. Cathode rays are
(a) positive rays (b) neutral rays
(c) helium rays (d) electron waves
2. Which one of the following statement(s)
is/are not correct? [CDS 2016]
(a) The cathode rays originate from
cathode and proceed towards the
anode in a cathode ray discharge
tube.
(b) The television picture tubes are
nothing but cathode ray tubes.
(c) The cathode rays themselves are not
visible.
(d) The characteristics of cathode
rays depend upon the nature of the
gas present in the cathode ray tube.
3. Positive rays were discovered by
(a) Thomson (b) Goldstein
(c) W-Crookes (d) Rutherford
4. Positive rays are very identical to
(a) α-particle rays (b) β-rays
(c) γ-rays (d) None of these
5. Electron emission from a metallic
surface by the application of light is
known as [NDA 2017]
(a) thermonic emission
(b) photoelectric emission
(c) high field emission
(d) auto electronic emission
Order Photoelectric Effect Assignment
6. Who among the following has
explained the phenomenon of
photoelectric effect? [NDA 2019]
(a) Max Planck
(b) Albert Einstein
(c) Neils Bohr
(d) Ernest Rutherford
7. Which phenomena shows the particle
nature of light? [SSC CGL 2017]
(a) Diffraction
(b) Interference
(c) Photoelectric effect
(d) Polarisation
8. Photoelectric effect can be explained
by assuming that light
(a) can be polarised.
(b) consist of quanta.
(c) is a form of transverse wave.
(d) is a form of longitudinal wave.
9. Which one of the following metal is
used in the filaments of photoelectric
cells that converts light energy into
electric energy? [NDA 2018]
(a) Tungsten (b) Copper
(c) Rubidium (d) Aluminium
Order Photoelectric Effect Assignment
10. If a free electron moves through a
potential difference of 1 kV, then the
energy gained by the electron is given
by [NDA 2018]
(a) 16 10 19
. ×
−
J
(b) 16 10 16
. ×
−
J
(c) 1 10 19 ×
−
J
(d) 1 10 16 ×
−
J
11. In photoelectic effect, the number of
photo electrons emitted is proportional
to
(a) velocity of incident beam.
(b) work function of photo cathode.
(c) frequency of incident beam.
(d) intensity of incident beam.
12. Consider the following sentences.
I. The phenomenon of emission of
electrons from metals under the effect of
light rays is called photoelectric effect.
II. The electron emitted by the
photoelectron effect are called proton.
III. The phenomena like interference
diffraction and polarisation were
explained successfully on the basis of
wave nature of radiation.
Which of the above sentence/sentences
is/are correct? [NDA 2020]
(a) I and II
(b) II and III
(c) I and III
(d) None of the above
13. The minimum energy required for the
emission of photoelectron from a metal
is called
(a) work function
(b) stopping potential
(c) frequency
(d) None of the above
14. The stopping potential for
photoelectrons depends
(a) on the intensity of the incident light.
(b) on the frequency of the incident light
and the cathode materials.
(c) only on the cathode materials.
(d) only on the frequency of the incident
light.
15. The threshold frequency of material is
[NDA 2020]
(a) the minimum frequency of light
which can emit photoelectrons from
materials.
(b) the maximum frequency of light
which can emit photoelectrons from
materials.
(c) The minimum energy required for the
emission of photoelectron from a
material.
(d) None of the above
16. The value of plank’s constant is
(a) 6 6 10 38
. ×
−
Js (b) 6 6 10 34
. ×
−
Js
(c) 67 10 39
. ×
−
Js (d) 7 9 10 35
. ×
−
Js
17. Assertion (A) Photoelectric effect
demonstrates the particle nature of
light.
Reason (R) The number of
photoelectrons is proportional to the
frequency of light.
Codes
(a) Both A and R are true and R is the
correct explanation of A
(b) Both A and R are true, but R is not the
correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
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