12th Class FSC Part 2 Physics Online Test

Life time of metastable states is

• 10^-6 sec or more A
• 10^-3 sec or more B
• 10^-5 sec or more C
• None of these D

The mutual inductance between two coils depends upon their

• Size A
• Core material B
• Size, core material and separation C
• Separation D

For ohmic device the graph between V and I is.

• A straight line A
• Curve B
• Hyperbola C
• Parabola D

Before and after nuclear reaction the number of protons and neutrons:

• Must be different  A
• Must be decreased B
• Must be increased C
• Remains same D

Glass and high steel carbon are example of.

• Ductile substances A
• Brittle substances B
• Soft substances C
• Hard substances D

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

Depletion region carries.

• -ve charge A
• +ve charge B
• Ions C
• No charge D

Photo diode is used for detection of.

• Heat A
• Magnet B
• Current C
• Light D

If a charge Q flows through any cross section of the conductor in time t, the current I is

• I=Qt A
• I= Q/t
  
  B
• I= Q*t
  
  C
• I= Q-t
  
  D

An ammeter is an electrical instrument which is used to measure.

• Voltage A
• Current B
• Resistance C
• None D

The shortest wave length is Bracket series has wave length.

• 16/Rn A
• Rn/16 B
• 16 Rn C
• 4 Rn D

X- ray diffraction reveals that these are

• Particle type A
• Wave type B
• Both wave and particle C
• None of above 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 resistance between the inverting (-) and non inverting inputs is called Input resistance and is the order of.

• Ohms A
• Kilo Ohms B
• Mega Ohms C
• Thounds Ohms D

A positive charge is moving towards an observer, The direction of magnetic induction will be.

• Toward right A
• Anti clockwise B
• Clockwise C
• Toward left D

For workers in nuclear facilities is, a weekly does of is normally considered safe

• 1.0 msv A
• 5.0 msv B
• 2.0 msv C
• 3.0 msv D

When the back emf in a current is zero, it draws

• Zero current A
• Maximum current B
• Minimum current C
• Steady average current D