12th Class FSC Part 2 Physics Online Test

The gate, which changes the logic level to its opposite level is called

• NOR gate A
• AND gate B
• OR gate C
• NOT gate D

For non-ohmic devices, the graph between V and I is

• Not a straight line A
• A straight line B
• A curve C
• All of above D

Torque is produced in a current carrying coil when it is placed in a

• Magnetic field A
• Electric field B
• Gravitational field C
• Nuclear field D

The permeability of free space is measured in

• wb A/m A
• Am/wb B
• wb/Am C
• m/wbA D

The phase angle of a series RLC circult at resonant frequency is

• 1/2 A
• sigma B
• Zero C
• sigma /4 D

Electric intensity due to an infinite sheet of charge is:

• ∂/2ε_∘ A
• ∂/rε_∘ B
• ∂/r2ε_∘ C
• none of these 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

Direct current can not flow through.

• Inductor A
• Resistor B
• Transistor C
• Capacitor D

The semi conductor diode has the property of

• Two way conduction A
• Zero conduction B
• One way conduction C
• Amplification D

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

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

If a step up transformer were 100% efficient the primary and secondary winging's would have the same.

• Current A
• Power B
• Voltage C
• Direction of winding D

• Lenz's law A
• Faraday's law B
• Ampere's law C
• None of these D

If the potential difference across two plates of capacitor is doubled, then energy stored in it will be.

• Two times A
• Eight times B
• Four times C
• Remain same D

Subatomic particles are divided into groups.

• Photon A
• Laptons B
• Hadrons C
• All of these D

The Weber is unit of measure of:

• Conductance A
• Electric current B
• Magnitic flux C
• Electric flux D

The acceleration of an electron of mass m and charge e, moving with uniform speed v at right angles to a magnetic field of flux density B, is given by

• 
  A
• 
  B
• 
  C
• Bevm D

the substances in which the atoms do not form magnetic dipoles are called.

• Diamagnetic A
• Para magnetic B
• Ferro magnetic C
• Crystal D