PHOTOELECTRIC EFFECT

The current through a motor is larger in the beginning than when the motor is running at full speed is due to

• back emf

• amature speed

• potential difference

• magnetic field

The amount of energy radiated per second by a body does not depend upon ________

• Nature of surface

• Area of surface

• Mass of the body

• Temperature difference of the surface and surrounding

If the rms current in a 50 Hz AC circuit is 5A, the value of the current is 1/300 seconds after its value becomes zero is

• 5/6 A

The capacity of a parallel plate condenser is inversely proportional to:

• area of each plate

• dielectric constant

• permittivity of medium

• distance between two plates

Which of the following phenomenon proves that light is a transverse wave 

• Reflection

• Refraction

• Ploarisation

• interference

At what temperature will the R.M.S. velocity of a gas be double its value at N.T.P.?

• 273^o C

• 546^oC

• 819^oC

• 1092^oC

Pa (Pascal) is the unit for

• Thrust
• Pressure
• Frequency
• Conductivity

what is the formula for momentum?

• p=vm

• p=mv

• i=mv

solve for momentum! .14kg and 30m/s

• 4.2

• 4.8

The unit of electrical potential is the ? , which is represented by the letter ? .

• ampere/A

• resistance/R

• volt/V

• watt/W