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Atoms Test - 18

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Atoms Test - 18
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  • Question 1
    1 / -0
    Which one of the following properties is not found in cathode rays ?
    Solution
    Properties of cathode rays:
    They are produced by the negative electrode, or cathode, in an evacuated tube, and travel towards the anode.
    They travel in straight lines and cast sharp shadows.
    They have energy and can do work.
    They are deflected by electric and magnetic fields and have a negative charge.
  • Question 2
    1 / -0
    According to kinetic theory of matter, a molecule is the smallest particle of a substance and it possesses :
    Solution
    A molecule is defined as the smallest particle which possesses all the properties of the substance.
  • Question 3
    1 / -0
    How does mass change with increase in temperature?
    Solution
    With increase in temperature
    1. The mass of the substance remains unchanged.
    2. Volume of the substance increases as with increase in temperature and the substance expands.
    3. The density of the metallic piece is decreased. This is because density is inversely proportional to volume.
    And as Volume increases, so the density decreases.
  • Question 4
    1 / -0
    If the pressure within a discharge tube is reduced from $${10}^{-3}   mm$$ to $${10}^{-4}  mm$$ mercury then the rays which are produced perpendicular to the cathode surface are known as
    Solution
    If the pressure in a discharge tube is reduced to $$10^{-4}mm$$, then cathode rays (rays of electrons) come out, perpendicular to the cathode surface .Due to very low pressure, electrons can easily reach to the target without any deflection due to gas molecules.
    Anode rays or Canal rays travel from anode through the cathode holes to the tube wall. 
    X-rays are generated by the reverse photo electric effect, in which photons are produced by electrons.
  • Question 5
    1 / -0
    The idea of parmanu was given by :
    Solution
    John Dalton (1766 – 1844), an English chemist and physicist, is the man credited today with the development of atomic theory.  However, a theory of atoms was actually formulated 2,500 years before Dalton by an Indian sage and philosopher, known as Acharya Kanad.
  • Question 6
    1 / -0
    The name atom belongs to which language ?
    Solution
    The word atom is derived from Greek word, 'atomos'.  In Greek, the prefix "a" means "not" and the word "tomos" means cut. Our word atom therefore comes from atomos, a Greek word meaning uncuttable.
  • Question 7
    1 / -0
    Complete the following :
    Mass $$=$$___________  $$ \times $$ density
    Solution
    We know that Density is the mass per unit volume
    i.e $$\Rightarrow density = \dfrac{mass}{volume}$$
    $$\therefore mass = Volume \times density$$
  • Question 8
    1 / -0
    In a vacuum diode, the space around the cathode which is filled with electrons, is called ________ .
    Solution
    A
    The large number of free electrons emitted from the cathode is builds up at one place near the cathode and forms a cloud of free electrons. Thus cloud of free electrons near the cathode is called space charge. Due to this space charge, the further emitted electrons come back to the cathode hence no virtual emission takes place hence no current flows in the circuit. 
  • Question 9
    1 / -0
    The conditions for the discharge of electricity in a discharge tube are :
    Solution
    Low pressure and high potential 
    In discharge tubes,  a high electric field is applied between the two electrodes the medium between them which is a gas at low pressure.  Due to the electric field, the gas gets ionized, releasing electrons which moves towards the anode thus constitutng the electric current.  A low pressure is required as at high pressure the movement of electron will be retarded due to collision with nucleus / atoms of gas. 
  • Question 10
    1 / -0
    An element has number of proton = 7. Then what will be its atomic number?
    Solution
    Atomic number of any element is equal to number of proton or number of electron
    Atomic Number = no. of proton = no of electron 
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