15 Questions MCQ Test Science Class 9 - Test: Model Of An Atom
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Detailed Solution for Test: Model Of An Atom - Question 4
An anode ray (also positive ray or canal ray) is a beam of positive ions that is created by certain types of gas-discharge tubes. They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886.
Detailed Solution for Test: Model Of An Atom - Question 5
They were first observed in Crookes tubes during experiments by the German scientist Eugen Goldstein, in 1886. Later work on anode rays by Wilhelm Wien and J. J. Thomson led to the development of mass spectrometry.
Which of the following gases do not have neutron in the nucleus of their atoms?
Detailed Solution for Test: Model Of An Atom - Question 6
There is only one stable atom that does not have neutrons. It is an isotope of the element hydrogen called protium. Protium, which contains a single proton and a single electron, is the simplest atom. All other stable atoms contain some number of neutrons.
Which of the following is not true for cathode rays?
Detailed Solution for Test: Model Of An Atom - Question 7
Characteristics of cathode rays are:
(i) The cathode rays start from cathode and move towards the anode.
(ii) These rays themselves are not visible but their behaviour can be observed with the help of phosphor materials such as ZnS.
(iii) In the absence of electrical or magnetic field, these rays travel in straight lines.
(iv) In the presence of electrical or magnetic field, the behaviour of cathode rays are similar to that expected from negatively charged particles, suggesting that the cathode rays consist of negatively charged particles, called electrons.
(v) The characteristics of cathode rays (electrons) do not depend upon the material of electrodes and the nature of the gas present in the cathode ray tube.
Correct answer is C.
What will be the net charge on the atom if it contains one electron and one proton?
Detailed Solution for Test: Model Of An Atom - Question 8
An electron is a negatively charged particle, whereas a proton is a positively charged particle. The magnitude of their charges is equal. Therefore, an atom containing one electron and one proton will not carry any charge.
Which of the following is not a part of J. J. Thomson’s atomic model?
Detailed Solution for Test: Model Of An Atom - Question 11
J. J. Thomson, who discovered the electron in 1897, proposed the plum pudding model of the atom in 1904 before the discovery of the atomic nucleus in order to include the electron in the atomic model. In Thomson's model, the atom is composed of electrons (which Thomson still called “corpuscles,” though G. J.
Select the sub-atomic particles that are present in the nucleus of an atom.
Detailed Solution for Test: Model Of An Atom - Question 12
Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons.
The mass of an electron is approximately 1/2000 times that of:
Detailed Solution for Test: Model Of An Atom - Question 15
Here it means that when we compare the mass of protons and electrons. Electrons weigh much less than protons and therefore when the mass of an atom is calculated then just the mass of protons and neutrons is taken into consideration.
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