12th Class Fsc Physics Online Preparation

Online Short Questions For Chapter 3 "12th Class Physics Chapter 3 Short Questions Preparation "

Try The Short Questions For 12th Class Physics Chapter 3 Short Questions Preparation

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Physics - 12th Class Physics Chapter 3 Short Questions Preparation

Question # 1

Briefly give the function of Filament,Cathode,Grid and plates in C.R.O.

  • Ans 1: Filament: It heats the cathode.
    Cathode: It emits the electrons.
    Grid:It controls the number of electrons.
    Plates: The two sets of plates are used to deflect the beam of electrons along x axis and y axis.
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Physics Chapter 3 Short Questions Preparation "

12th Class Physics Chapter 3 Short Questions Preparation - Set 1

Question # 1

Briefly give the function of Filament,Cathode,Grid and plates in C.R.O.

  • Ans 1: Filament: It heats the cathode.
    Cathode: It emits the electrons.
    Grid:It controls the number of electrons.
    Plates: The two sets of plates are used to deflect the beam of electrons along x axis and y axis.
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12th Class Physics Chapter 3 Short Questions Preparation - Set 2

Question # 1

What is AVO-meter?Explain

  • Ans 1: It is an instrument which can measure current in amperes potential difference in volts and resistance in ohms.It basically consists of sensitive moving coil galvanometer which is converted into multirange ammeter ,voltmeter or ohmmeter accordingly as a circuit.
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12th Class Physics Chapter 3 Short Questions Preparation - Set 3

Question # 1

Can a charge at rest be set into motion by bringing a magnet close to it?

  • Ans 1: No a charge at rest can not be set into motion by bringing a magnet close to it.
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12th Class Physics Chapter 3 Short Questions Preparation - Set 4

Question # 1

How can you use a magnetic field to separate isotopes of chemical elements?

  • Ans 1: Sinci isotopes of an elements have same charge number but different mass number.As we known that the radius of a charged particle inside a magnetic field is given as, r=mv/qB
    It shows that the isotopes projected from the same point at right angle to the magnetic field B will follow circular path of different radii due to their different masses,So they can be distinguished easily.
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Physics
14th Chapter

12th Class Physics Ch 14 Preparation

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