12th Class FSC Part 2 Physics Online Test

when an inductor comes close to a metallic object, its inductance is.

• Decreased A
• Increased B
• Becomes half C
• Becomes 4 times D

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

• 50 V A
• 2 V B
• 5 V C
• 15 V D

The number of electrons in one coulomb charge is equal to

• 6.2 x 10¹⁸ electrons A
• Zero electrons B
• 1.6 x 10^-22 electrons C
• 6.2 x 10²¹ electrons D

• 
  A
• 
  B
• 
  C
• None of the above D

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

• Uncertainity Priciple A
• De-broglie Theory B
• Einstin Theory C
• Photo electric effect D

Transistor was invented by:

• Bardeen A
• Micheal faraday B
• Lenz C
• Newton D

A wire uniform cross-section. A length L and resistance R is cut into two equal parts. The resistivity of each part will be:

• Doubled A
• Halved B
• Remain the same C
• One fourth D

The peak value of alternating current is 5√2 A. The mean square value of current will be:

• 5A A
• 2.5A B
• 5√2A C
• 5² D

There is no charge in A and Z of any radioactive element by the emission of.

• Alpha particle A
• Beta particle B
• Gama particle C
• X- rays D

Binding energy per nucleus for uranium is above:

• 6.7 Mev A
• 7.7 Mev B
• 6.9 MeV C
• 7.9 MeV D

The radius of hydrogen atom is:

• 0.53A° A
• 0.053A° B
• 0.53 x 10^-9 C
• 0.053 x10^-9 D

If a charged body is moved against the electric field it will gain.

• P.E. A
• K.E. B
• Mechanical energy C
• Electrical potential energy D

The converses of annihilation of matter is:

• Photoelectric effect A
• Relativistic effect B
• Pair production C
• Compton effect D

The rod of unit length is moving at 30 o through a magnetic field of 1 T. If the velocity of rod is 1 m/s, then induced emf in the rod will be given by

• I V A
• 0.25 V B
• 0.5 V C
• 0.6 V D

The absolute electric potential at a point distance 20 cm from a charge of 2 uC is.

• 9 x 10² V A
• 9 x 10³ V B
• 9 x 10⁴ V C
• 9 x 10 ⁵ V D

When gama rays are emitted, the nuclear mass.

• Decreases by 4 units A
• Does not change B
• Increases by 2 units C
• Increase by 1 unit D

We can find from de Broglie formula

• Wavelength A
• Amplitude B
• Speed of wave C
• Frequency of wave D