12th Class FSC Part 2 Physics Online Test

The velocity of an oscillating charge as it moves to and fro along a wire is.

• Changing A
• Constant B
• Infinite C
• zero D

The Compton effect is associated with

• X-rays A
• y-rays B
• Positive rays C
• ß-rays D

In gas the charge carriers are:

• Electrons A
• Ions B
• Both a & b C
• None of above D

The SI unit of decay constant is

• m A
• m^-1 B
• S^-1 C
• Nm^-1 D

In an N-type silicon, which of the following statement is true?

• Electrons are majority carriers & trivalent atoms are the dopants A
• Electrons are majority carriers & pentavalent atoms are the dopants B
• Holes are minority carriers & pentavalent atoms are the dopants. C
• Holes are minority carriers & trivavalent atoms are the dopants. D

The X-rays diffraction with crystal was first studied by

• W.H Bragg A
• W.L. Bragg B
• Michelson C
• None of these D

X-rays were discovered by

• Curie A
• Henry Becquerel B
• Rontgen C
• None of these D

A solid having regular arrangement of molecules throughout its structure is called.

• Amorphous solid A
• Polymeric solid B
• Crystalline solid C
• Glassy solid D

Pair production can take place only when energy of radiation is equal and greater than 1.02 MeV, thus correct option is.

• X rays A
• Gama rays B
• Heat Radiation C
• Ultraviolet rays D

Pair production cannto take place in vacuum because :

• Mass in not conserved A
• Momentum is not conserved B
• Energy is not conserved C
• Charge is not conserved D

Black Body radiation spectrum is an example of:

• Atomic spectra A
• Line spectra B
• Continuous spectra C
• None of above D

The sensitivity of galvanometer directly depends upon

• Magnetic field A
• Area of coil B
• Both a and b C
• None of a, b, c D

• 
  A
• 
  B
• 
  C
• 
  D

The capacitance of a capacitor depends upon.

• Thickness of plates A
• Charges on the plates B
• Voltage applied C
• Geometry of the capacitor D

If there is no fourth band, tolerance is shows as

• 
  A
• 
  B
• 
  C
• 10% D

Electro encephalon graph is the diagnostic test for the working of.

• Eye A
• Heart B
• Brain C
• Lungs D

The color code of "Green"

• 8 A
• 3 B
• 5 C
• 7 D