ECAT Physics Online Test With Answers

ECAT Physics Online Test

Sr. # Questions Answers Choice
1 According to Rutherford atomic model, the positive charge in an atom is concentrated at its centre is in the form of positive electron at same distance from its centre is spread uniformly through its volume none of these
2 The chemical behaviour of an atom is determined by binding energy atomic number mass number number of isotopes
3 1 amu is equal to 1.66 x 10<sup>-24</sup>kg 1.66 x 10<sup>-19</sup>kg 1.66 x 10<sup>-34</sup>kg 1.66 x 10<sup>-27</sup>kg
4 Mass of proton is 1.67 x 10<sup>-27</sup>kg 1.67 x 10<sup>-31</sup>kg 1.66 x 10<sup>-34</sup>kg 1.67 x 10<sup>-17</sup>kg
5 Mass of neutron is 1.67 x 10<sup>-31</sup>kg 1.67 x 10<sup>-27</sup>kg 9.1 x 10<sup>-31</sup>kg 1.67 x 10<sup>-</sup>19kg
6 Nucleus consists of proton and neutron protons and electron electron and neutron protons only
7 A particle having the mass of electron and charge of a proton is called a photon position antiproton antineutrino
8 Charge on neutron is 1.6 x 10<sup>-19</sup>C zero -1.6 x 10<sup>-19</sup>C 1.2 x 10<sup>-19</sup>C
9 In 1932 Chadwick discovered proton neutron photon electron
10 Neutron was discovered by Curie Roentgen Chadwick Rutherford
11 Neutron was discovered in 1915 1920 1925 1932
12 Proton was discovered by Rutherford in 1915 1906 1910 1920
13 According to the electromagnetic wave theory of light, increasing the intensity of incident light should increase the number of photoelectrons size of the photoelectrons charge on photoelectrons K.E of photoelectrons
14 As the light shines on the metal surface, the electrons are ejected slowly instantaneously either of these none of these
15 The value of threshold frequency for different metals is different same may be different or may be same none of these
16 There is certain frequency below which no electrons are emitted from the metal surface, this frequency is known as maximum frequency minimum frequency threshold frequency all of these
17 The photoelectric effect, the maximum energy of photoelectrons depends on the particular metal surface frequency of incident light both of them none of them
18 When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called thermoionic electrons free electrons photoelectrons slow electrons
19 The emission of electrons from a metal surface when exposed to light of suitable frequency is called the pair production Compton effect photoelectric effect relativity
20 Electromagnetic radiation or photons interact with matter in two distinct ways three distinct ways four distinct ways five distinct ways
21 The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by Max plank Newton Einstein J.J. Thomson
22 The analysis of the distribution of wavelengths of the radiation emitted from a hot body set the foundation of new mechanics, known as classical mechanics Newtonian mechanics quantum mechanics statistical mechanics
23 The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is 100 ev 10<sup>6</sup>e v 10<sup>3</sup>e v 1.0 e v
24 The photon of radio-waves has energy of about 1 Me V 1 Ke v 10<sup>-10</sup>e v 10<sup>10</sup>e v
25 From the theory of relativity, momentum p of the photon is related to energy as p = hfc p = hf/c p = f(hc,f) p = cf/h
26 Max plank received the Nobel Prize in physics for his discovery of energy quanta in 1900 1906 1912 1918
27 In photoelectric effect the energy of ejected electrons depend on The frequency The intensity Both frequency and intensity None of these
28 The value of the plank's constant 'h' is given by 1.6 x 10<sup>-19</sup>J 1.67 x 10<sup>-27</sup>Kg 6.63 x 10<sup>34</sup>Js 6.63 x 10<sup>-34</sup>Js
29 A photon is considered to have Momentum Energy Wavelength All of the above
30 S.I. unit of planks constant is J-s<sup>-1</sup> J.s J.s<sup>-2</sup> J.s<sup>2</sup>
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