MCQ
Assertion : An electric bulb is first connected to a dc source and then to a ac source having the same brightness in both the cases.
Reason : The peak value of voltage for an $A.C.$ source is $\sqrt{2}$ times the root mean square voltage.
  • A
    If both assertion and reason are true and the reason is the correct explanation of the assertion.
  • B
    If both assertion and reason are true but reason is not the correct explanation of the assertion.
  • C
    If assertion is true but reason is false.
  • If assertion is false but reason is true.

Answer

Correct option: D.
If assertion is false but reason is true.
If assertion is false but reason is true.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

The average momentum of a molecule in a sample of an ideal gas depends on:
  1. Temperature.
  2. Number of moles.
  3. Volume.
  4. None of these.
An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along (a) Positive y-direction (b) Negative y-direction(c) Positive z-direction(d) Negative z-direction
   
   
Which of the following particles will have minimum frequency of revolution when projected with the same velocity perpendicular to a magnetic field?
$F _{g}$ and $F _{e}$ represents gravitational and electrostatic force respectively between electrons situated at a distance $10 \ cm$ . The ratio of $F _{ g } / F _{e}$ is of the order of
Total internal reflection can take place only if:
  1. Light goes from optically rarer medium $($smaller refractive index$)$ to optically denser medium.
  2. Light goes from optically denser medium to rarer medium.
  3. The refractive indices of the two media are close to each other.
  4. The refractive indices of the two media are widely different.
For uranium nucleus how does its mass vary with volume
A square coil of area $10^{-2} m^2$ is kept perpendicular in a magnetic field of intensity $10^3 Wb / m ^2$. The magnitude of magnetic flux passing through the square is :
An electron moving towards the east enters a magnetic field directed towards the north. The force on the electron will be directed (a) Vertically upward(b) Vertically downward(c) Towards the west(d) Towards the south
   
   
The wavelength of X-rays decreases, when(a) Temperature of target is increased(b) Intensity of electron beam is increased(c) K.E. of electrons striking the target is increased(d) K.E. of electrons striking the target is decreased
 
 
 
 
The minimum amount of energy required to emit electrons from a metal surface is called: