Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

Advertisement
11.

The electric field of an electromagnetic wave in free space is given by stack bold E bold space with rightwards arrow on top space equals space 10 space cos space left parenthesis 10 to the power of 7 space straight t space space plus kx right parenthesis bold j with hat on top space straight V divided by straight m, where t and x are in seconds and meters respectively. It can be inferred that

1) the wavelength λ is 188.4 m.
2)The wave number k is 0.33 rad/m.
3)The wave amplitude is 10 V /m.
4)The wave is propagating along +x direction

  • (3) and (4)

  • (1) and (2) 

  • (2) and (3)

  • (2) and (3)

311 Views

12.

The electric potential at a point (x, y, Z) is given by

V = - x2y -xz3 + 4

The electric field E at that point is

  • bold E with bold rightwards arrow on top space equals bold i with bold hat on top space left parenthesis 2 space xy space plus space straight z cubed right parenthesis space plus space bold j with hat on top space straight x squared space plus space bold k with bold hat on top space 3 xz squared
  • bold E with bold rightwards arrow on top space equals bold i with bold hat on top space 2 space xy space plus space bold j with hat on top space left parenthesis straight x squared space plus straight y squared space right parenthesis space plus space bold k with bold hat on top space left parenthesis 3 xz space minus straight y squared right parenthesis
  • bold E with bold rightwards arrow on top space equals bold i with bold hat on top space left parenthesis straight z cubed right parenthesis space plus space bold j with hat on top space left parenthesis xyz space right parenthesis space plus space bold k with bold hat on top space straight z squared
  • bold E with bold rightwards arrow on top space equals bold i with bold hat on top space left parenthesis straight z cubed right parenthesis space plus space bold j with hat on top space left parenthesis xyz space right parenthesis space plus space bold k with bold hat on top space straight z squared
343 Views

13.

A hollow cylinder has to charge q coloumb within it. Φ is the electric flux in a unit of voltmeter associated with the curved surface B, the flux linked with the plane surface A in a unit of voltmeter will be:

  • 1 half open parentheses q over epsilon subscript o minus capital phi close parentheses
  • fraction numerator straight q over denominator 2 straight epsilon subscript straight o end fraction
  • straight ϕ over 3
  • straight ϕ over 3
579 Views

14.

In a discharge tube ionization of enclosed gas is produced due to collisions between

  • positive ions and neutral atoms/molecules

  • negative electrons and neutral atoms/molecules

  • photons and neutral atoms/molecules

  • photons and neutral atoms/molecules

840 Views

Advertisement
15.

A square surface of side L m is in the plane of the paper. A uniform electric field straight E with rightwards arrow on top space left parenthesis straight V divided by straight m right parenthesis, also in the plane of the paper, is limited only to the lower half of the square surface, (see figure). The electric flux in SI units associated with the surface is

  • EL squared divided by left parenthesis 2 straight epsilon subscript 0 right parenthesis
  • EL squared divided by 2
  • zero

  • zero

614 Views

16.

An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is

  • Smaller

  • 5 times greater

  • Equal

  • 10 times greater


17.

A certain charge Q is divided into two parts q and Q-q. How the charge Q and q must be related so that when q and (Q-q) is placed at a certain distance apart experience maximum electrostatic repulsion?

  • Q = 2q

  • q = 3q

  • Q = 4q

  • Q= 4q + c


18.

A charged particle 'q' is shot with speed v towards another fixed charged particle Q. It approaches Q upto the closest distance r and then returns. If q were given a speed 2v, the closest distance of approach would be

  • r

  • 2r

  • r/2

  • r/4


Advertisement
19.

A conducting sphere of radius R = 20 cm is given by a charge Q = 16μC. What is E at centre?

  • 3.6×106 N/C

  • 1.8×10N/C

  • Zero

  • 0.9×106 N/C


20.

If an insulated non-conducting sphere of radius R has charge density ρ. The electric field at a distance r from the centre of sphere (r > R) will be

  • ρ R3εo

  • ρ rεo

  • ρ r3 εo

  • 3 ρ Rεo


Advertisement