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ECAT Chemistry Chapter 5 Atomic Structure Online Test
| Sr. # | Questions | Answers Choice |
|---|---|---|
| 1 | The experimental evidences for the existence of atomic nucleus comes from: | Line spectrum of hydrogen. Magnetic bonding of cathode rays. Millikan oil drop experiment. Scattering of alpha particles by thin metal foil. |
| 2 | Anode is the surface on which probability of finding electron is: | 50% Less than 10%. More than 95%. Zero. |
| 3 | Which one of the following statements is true about discovery of neutrons? | These particles were formed by the bombardment of Alpha-particles on Beryllium. These particles are formed by the spiting of alpha-particles. These particles were discovered by natural radioactivity. None of above. |
| 4 | With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s: | Greater. same. Smaller. Not fixed. |
| 5 | Negatively charged particle nature of cathode rays was first demonstrated in 1895 by: | Millikan. J. Perrin. Hittrof J.J. Thomson. |
| 6 | Which one of the following particles has amass 1/1836 time, that of hydrogen? | Neutron. Proton. Electron. Positron. |
| 7 | Proton was discovered by: | Chadwick J.J. Rhomson Millikan. Goldstein. |
| 8 | Charge on electron was discovered by: | Millikan. Crook. Neil Bohr. Rutherford. |
| 9 | The charge over mass ratio of electron is: | <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.6 x 10<sup>-1</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.7588 x 10<sup>11</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">6.62 x 10<sup>-34</sup></span> C Kg<sup>-1</sup><o:p></o:p></p> |
| 10 | Mass of simple electron is: |
<p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> kg<o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-30</sup></span> kg<o:p></o:p></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.66 x 10<sup>-31</sup></span> kg<span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;"><o:p></o:p></span></p> <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">9.1 x 10<sup>-31</sup></span> kg<o:p></o:p></p> |
| 11 | Charge of an electron is: | <p class="MsoNormal"><span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">1.6 x 10<sup>-19</sup></span> C<o:p></o:p></p> <p class="MsoNormal">9.1 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>-34</sup></span> C<o:p></o:p></p> <p class="MsoNormal">1.7588 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>11</sup></span> C<o:p></o:p></p> <p class="MsoNormal">6.62 x <span style="font-size: 10.5pt; line-height: 107%; font-family: Arial, sans-serif; background-image: initial; background-position: initial; background-size: initial; background-repeat: initial; background-attachment: initial; background-origin: initial; background-clip: initial;">10<sup>-34</sup></span> C<o:p></o:p></p> |
| 12 | When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of: | Alpha rays. Negative particles. Electromagnetic rays. Positive particles. |
| 13 | Charge to mass ratio of electron was discovered by: | Millika. Rutherford. J.J. Thomson. Chadwick. |
| 14 | Alpha rays consist of: | Neutrons. Helium nucleus. Protons. Hydrogen nucleus. |
| 15 | Maximum potential energy that an electron can have within the atom is: | Equal to zero. Less than zero. Greater than zero. Infinite |
| 16 | Which of the following particles has longest wavelength, if they have same speed: | Proton. Neutron. Electron. Positron. |
| 17 | Which of the following was discovered first: | Charge to mass ratio of electrons. Mass of electrons. Charge of electrons. All of above at same time. |
| 18 | The nature of positive rays depend on: | Nature of discharge tube. Nature of resident gas. Nature of electrode. All of above. |
| 19 | The e.m value for positive rays maximum for: | Oxygen. Nitrogen. Helium. Hydrogen. |
| 20 | Neutron was discovered by: | Chadwick. Bohr. Rutherford. Plank. |
| 21 | When 6d orbital is complete, the entering electron goes into: | 7f. 7s. 7p. 7d. |
| 22 | Orbital having same energy is called: | Hybrid orbital. Valence orbital. Degenerate orbital. D-orbital. |
| 23 | Quantum number value for 2p orbitals are: | n=2 ,l=1 n=1 ,l=2 n= ,l=0 n=2 ,l=0 |
| 24 | In the ground state of an atom, the electron is present: | In the nucleus. In the second shell. Nearest to the nucleus. farthest from the nucleus. |
| 25 | Splitting of spectral lines when atoms are subjected to strong electric field is called: | Zeeman effect. Stark effect Photoelectric effect. Compton effect. |
| 26 | Bohr model of atom is contradicted by: | Planck's quantum theory Pauli's exclusion theory Heisenberg's uncertainty principle. All of above. |
| 27 | Rutherford's model of atom failed because: | The atom did o have a nucleus and electrons It did not account fro the attraction b/w protons and neutrons It did no account for the stability of the atom. There is actually no space b/w the nucleus ad the electrons. |
| 28 | The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be: | 500 NM. 500 M. 200 NM. 5 x 10<sup>7</sup>m |
| 29 | The velocity of photon is: | Independent of its wavelength. Depends on its wavelength. Equal to square of its amplitude Depends on its source. |
| 30 | The nature of positive ray depend on: | The nature of electrode. The nature of discharge tube. The nature of residual gas. All of above. |
