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1. Question marks are mentioned with each Question.
2. Please write neat and clean hand-writing on Answer Sheet. Use Margin on right side and left side of Answer Sheet.
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5. This is a ONE TIME attempt test. Once started, it cannot be reversed or attempted again.
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1
Who discovered Neutron?
Ostwalt
Thomson
Goldstein
Chadwick
2
When the pressure of the gas in the discharge tube is at atmospheric pressure and a high voltage is applied across the electrodes, nothing noticeable happens. But, as the pressure is ____________ or the voltage is __________, sparking, or irregular streaks of light are seen in the tube.
lowered, increased
lowered, decreased
high, increased
high, decreased
3
Which of the following statement / statements is correct :
(a) Cathode rays are positively charged.
(b) Speed of cathode rays is slower than light.
Only (a) is correct.
Only (b) is correct.
Only (a) and (b) is correct.
None of these
4
Anode rays consists of ____________ charged particles.
Positively
Negatively
Zero
5
Most of the space inside the atom is _____________ because most of the alpha-particles passed through the gold foil without getting deflected.
filled with electrons
filled with protons
empty
Both (a) and (b) are correct.
6
Which of the following statement / statements are correct :
(a) A thin sheets of gold foil was used by Rutherford.
(b) A thin sheets of Silver foil was used by Rutherford.
7
At normal pressure air or any other gas is a non - conductor of electricity, but at ____________ pressures the gases become conductors of electricity.
High
Low
Normal
None of these.
8
(a) Cathode rays travel in straight line.
(b) Specific charge of cathode ray is constant.
9
The electrode which is connected to the negative terminal of the source is called the ____________.
Anode
Electrode
Rod
Cathode
10
(a) J.J Thomson discovered electron.
(b) Electron are negatively charged particle and are denoted by e-
Only (a) is the correct.
Only (b) is the correct.
Only (a) and (b) the correct.
11
(a) The absolute mass of a proton is g.
(b) The mass of a proton is 1838 times that of an electron.
12
(a) The Cathode Rays is the phenomena observed under reduced pressure and high voltage depends upon the nature of the gas in the tube.
(b) The Cathode Rays is the beam of negatively charged particles.
13
A very small fraction i.e. _________ in 1,00,000 of alpha-particles were deflected by __________ (i.e. they rebound), indicating that all the positive charge and mass of atom were concentrated in a very small volume within the atom.
1, 180º
2, 90º
1, 90º
2, 180º
14
(a) Anode rays also called canal rays is a beam of positive ions.
(b) Anode rays also called positive rays is a beam of positive ions.
(c) Canal rays also called positive rays is a beam of positive ions.
Only (c) is correct.
All of these
15
Which of the following are the limitations of Thomson model :
(a) It could not explain the stability of the atom ,i.e. how positive and negative charges could remain, so close together.
(b) It could not explain the distribution of electrons in the extra nuclear portion of the atom.