Question

Dielectric constant for metal is

(a) Zero  

(b) Infinite

(c) 1  

(d) Greater than 1

Answer

(b) Infinite

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

Predict the effect of length of conductor on drift velocity of electrons.
Force between the two parallel wires carrying currents has been used to define:

γ-rays radiation can be used to create electron-positron pair. In this process of pair production, γ-rays energy cannot be less than

(a) 5.0 MeV

(b) 4.02 MeV

(c) 15.0 MeV

(d) 1.02 MeV

A current passes through a wire of non-uniform cross-section. Which of the following quantities are independent of the cross-section?
  1. The charge crossing in a given time interval.
  2. Drift speed.
  3. Current density.
  4. Free-electron density.

Consider the following statements A to B  and identify the correct answer

A. Polarised light can be used to study the helical surface of nucleic acids.

B. Optics axis is a direction and not any particular line in the crystal

(a) A and B are correct

(b) A and B are wrong

(c) A is correct but B is wrong

(d) A is wrong but B is correct

A silver ball of radius 4.8 cm is suspended by a thread in the vacuum chamber. UV light of wavelength 200 nm is incident on the ball for some times during which a total energy of 1 × 10–7 J falls on the surface. Assuming on an average one out of 103 photons incident is able to eject electron. The potential on sphere will be

(a) 1 V     

(b) 2 V

(c) 3 V     

(d) Zero

Huygens' principle of secondary wavelets may be used to:
A metal wire is subjected to a constant potential difference. When the temperature of the metal wire increases, the drift velocity of the electron in it:
The contact angle between as solid and a liquid is a property of:
  1. The material of the solid.
  2. The material of the liquid.
  3. The shape of the solid.
  4. The mass of the solid.

The danger signals installed at the top of tall buildings are red in colour. These can be easily seen from a distance because among all other colours, the red light: