MDCAT Physics Online Test With Answers

MDCAT Physics Online Test

Sr. # Questions Answers Choice
1 The potential difference applied to an X-rays tube is increased. As a result, in the emitted radiation The intensity increases The minimum wavelength decrease The intensity remains unchanged Both B & C
2 Light of frequency 4f0 is incident on the metal of the threshold frequency f0. The maximum kinetic energy of the emitted photoelectrons is 3h f0 3/2h f0 2h f0 1/2h f0
3 Figure represents a graph of kinetic energy (K) of the photoelectrons (in eV) and frequency (v) for a metal used as cathode in photoelectric experiment. The work function of metal is: 1 eV 2 eV 1.5 eV 3 eV
4 The ratio of the longest and shortest wavelength of the Lyman series is approximately: 4/3 9/4 9/5 16/7
5 According to Bohr’s theory, a line in the Ballmer series arises when the electron jumps from any of the higher orbits to the orbit with quantum number: 1 2 3 4
6 In which region of the electromagnetic spectrum does the Lyman series of hydrogen atom lie? Infrared Visible Ultraviolet X-rays
7 A proton and an π‘Ž βˆ’ π’‘π’‚π’“π’•π’Šπ’„π’π’† are accelerated through same voltage, the ratio of their de- Broglie wavelength will be: 1:2 √2: 1 2√2: 1 2:1
8 The de-Broglie wavelength of the particle of mass m and energy E is: ℎ 𝜆 = ℎ√2𝑚𝐸 𝜆 =<span style="white-space:pre"> </span>1
9 Threshold wavelength for metal having work function 𝝋 is 𝝀. What is the threshold wavelength for metal having work function 2 π’Šπ’”: /𝟐 2 4 𝝀/𝟒
10 When ultraviolet rays are incident in metal plate, then photoelectric effect does not occur. It occurs by the incidence of: x-rays Infrared rays Radio wave Greenhouse effect
11 The hydrogen atoms are excited to the stationary state designated by the principal quantum number n=4, the number of maximum spectral lines are observe: 2 3 4 6
12 A proton, accelerated through a p.d V has a certain de Broglie wavelength. In order to have the same de Broglie wavelength, an π‘Ž βˆ’particles must be accelerated through a potential difference: 4V 8V V/4 V/8
13 As the intensity of incident light increases: Photoelectric current increases Photoelectric current decreases Kinetic energy of emitted photoelectrons increases Kinetic energy of emitted photoelectrons decreases
14 To find longest wavelength radiation in Ballmer series, the value of n used is: 2 3 4 ∞
15 Maximum speed of electrons in X-rays tube which is producing X-rays photons of frequency f is
16 J.J Thomson finds: Particle nature of the electron Dual nature of electron Wave nature of electron Electromagnetic nature of electron
17 G.P Thomson revealed: Particle nature of electron Dual nature of electron Wave nature of electron Electromagnetic nature of electron
18 Interference and diffraction of light confirms its: Particle nature Dual nature Wave nature Electromagnetic nature
19 Davisson and Germer received the Nobel prize for their work on: Wave nature of particle Corpuscular nature of wave Dual nature of particle All of them
20 De-Broglie received the Nobel prize on his work on: Wave nature of particle Corpuscular nature of wave Dual nature of particle All of them
21 De-Broglie received the Nobel prize in 1929 1937 1928 1924
22 Diffraction pattern has also been observed for: Proton Neutron Hydrogen atom All of them
23 In order to perform experiment, Davisson and Germer used accelerating voltage of: 54V 120V 220V 400V
24 Davisson and Germer, in their experiment used: Nickle crystal Lead crystal Graphite crystal Glass
25 Which of the particles, electron, proton and neutron moving with same speed has longest wave length? Electron Proton Neutron All have same
26 Interference and diffraction confirm: Particle nature Wave nature Dual nature None of these
27 The number of electrons emitted depend upon Colour of target surface Shape of surface Frequency of incident light Intensity of incident light
28 Rest mass energy of electron is: 1.02 MeV 0.51 MeV 931 MeV 200 MeV
29 In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased Number K.E P.E Frequency
30 The unit of work function is eV Volt Farad Herdz
31 The maximum kinetic energy of emitted photoelectrons depends upon: The intensity of incident light Frequency of incident light Metal surface Both frequency of incident light and metal surface
32 In order to increase the K.E of ejected photo electrons, there should be an increase in: Intensity of radiation NoneI Frequency of radiation Both (b) &amp; (c)
33 The reverse process of photo-electric effect is called: Pair production Compton effect Annihilation of matter X-rays
34 Potassium cathode in photocell emits electrons for a light: Visible Infrared Ultraviolet X-rays
35 Photoelectric effect and Compton effect prove the: Wave nature of light Particle nature of light Dual nature of light Dual nature of light
36 Compton Effect makes the use of the law of conservation of: Energy Momentum Charge Both (a) &amp; (b)
37 The unit Compton wavelength is same as: Compton wavelength Compton frequency Compton shift Both (a) &amp; (b)
38 In Compton effect, it was considered that X-rays consist of: Electrons Positrons Photons All of these
39 A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in: 1905 1911 19251 1923
40 Photo cells is a device which convert light into: Wave nature Particle nature Particle wave nature Dual nature
Download This Set

Is this page helpful?