MCQ
The direction of electric field is from:
  • A
    Positive to negative plate.
  • B
    Negative to positive plate.
  • C
    Both a and b.
  • D
    None.

Answer

  1. Positive to negative plate.

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

A magnet oscillating in a horizontal plane has a time period of 2 second at a place where the angle of dip is 30o and 3 seconds at another place where the angle of dip is 60o. The ratio of resultant magnetic fields at the two places is

(a)  

(b)

(c)      

(d)

The dispersive powers of glasses of lenses used in an achromatic pair are in the ratio 5 : 3. If the focal length of the concave lens is 15 cm, then the nature and focal length of the other lens would be

(a) Convex, 9 cm

(b) Concave, 9 cm

(c) Convex, 25 cm

(d) Concave,  25 cm

The ratio of the magnetic field at the centre of a current carrying circular wire and the magnetic field at the centre of a square coil made from the same length of wire will be

(a)

(b)

(c)

(d)

If ne and vd be the number of electrons and drift velocity in a semiconductor. When the temperature is increased

(a) ne increases and vd decreases

(b) ne decreases and vd increases

(c) Both ne and vd increases

(d) Both ne and vd decreases

According to Joule's law, if the potential difference across a conductor having a material of specific resistance remains constant, then the heat produced in the conductor is directly proportional to

(a) ρ

(b)  

(c)  

(d)  

A thin metal plate P is inserted between the plates of a parallel-plate capacitor of capacitance C in such a way that its edges touch the two plates (figure). The capacitance now becomes:

Consider the following two statements A and B, and identify the correct choice out of given answers

A. Thermo e.m.f. is minimum at neutral temperature of a thermocouple

B. When two junctions made of two different metallic wires are maintained at different temperatures, an electric current is generated in the circuit.

(a) A is false and B is true

(b) A is true and B is false

(c) Both A and B are false

(d) Both A and B are true

Four light waves are represented by

  1. $\text{y}=\text{a}_1\sin\omega\text{t}$

  2. $\text{y}=\text{a}_2\sin(\omega\text{t}+\in)$

  3. $\text{y}=\text{a}_1\sin2\omega\text{t}$

  4. $\text{y}=\text{a}_2\sin2(\omega\text{t}+\in)$

Interference fringes may be observed due to superposition of:

  1. (i) and (ii)
  2. (i) and (iii)
  3. (ii) and (iv)
  4. (iii) and (iv)
The propagation constant of a photon of wavelength 6284 A°.

What causes chromatic aberration?