Question

Electromagnetic waves are transverse in nature is evident by

(a) Polarization

(b) Interference

(c) Reflection

(d) Diffraction

Answer

(a) Polarization

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The minimum charge on an object is

(a) 1 coulomb

(b) 1 stat coulomb

(c)  coulomb

(d)  coulomb

A divergent lens will produce

(a) Always a virtual image 

(b) Always real image

(c) Sometimes real and sometimes virtual

(d) None of the above

Mark the correct options:
  1. An atom with a vacancy has smaller energy that a neutral atom.
  2. K X-ray is emitted when a hole makes a jump from the K shell to some other shell.
  3. The wavelength of K X-ray is smaller than the wavelength of L X-ray of the same material.
  4. The wavelength of $\text{K}_\alpha$ X-ray is smaller than the wavelength of $\text{K}_\beta$ X-ray of the same material.
Which among the following is true?
An AC generator is a device which converts:
If L is the coherent length and c the velocity of light, the coherent time is:
1C is the charge which is placed at a distance of 1m from the another charge of same magnitude in vacuum experiences an electrical force of repulsion of magnitude:

Match List I with List II and select the correct answer using the codes given below the lists :

List I

(Position of the object)

List II

(Magnification)

(I) An object is placed at focus before a convex mirror

(A) Magnification is -

(II) An object is placed at centre of curvature before a concave mirror

(B) Magnification is 0.5

(III) An object is placed at focus before a concave mirror

(C) Magnification is +1

(IV) An object is placed at centre of curvature before a convex mirror

(D) Magnification is  -1

 

(E) Magnification is 0.33

Codes :

(a) I-B, II-D, III-A, IV-E

(b) I-A, II-D, III-C, IV-B

(c) I-C, II-B, III-A, IV-E

(d) I-B, II-E, III-D, IV-C

Which of the following are not electromagnetic waves

(a) Cosmic rays

(b) Gamma rays

(c) b-rays    

(d) X-rays

In a region of space having a uniform electric field E, a hemispherical bowl of radius r is placed. The electric flux $\phi$ through the bowl is: