MCQ
Which is the best conductor of electricity?
  • A
    Iron
  • B
    Silver
  • C
    Copper
  • D
    Carbon

Answer

  1. Silver

Explanation:

Silver is the best conductor of electricity because it contains maximum number of free electrons.

Also the resistance of silver is very low.

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 light of an energy $6.48 \times 10^5 J$ is incident normally on nonreflecting surface The momentum imparted on the surface is _________ N-s.

The ratio of the magnetic field at the centre of a current carrying coil of the radius a and at a distance ‘a’ from centre of the coil and perpendicular to the axis of coil is

(a)  

(b)  

(c)  

(d) 2 

A dielectric slab is inserted between the plates of an isolated capacitor. The force between the plates will:
Let r be the distance of a point on the axis of a magnetic dipole from its centre. The magnetic field at such a point is proportional to:
  1. $\frac{1}{\text{r}}$
  2. $\frac{1}{\text{r}^2}$
  3. $\frac{1}{\text{r}^3}$
  4. None of these.
Which of the following waves is used in speed gun to measure the speed of ball in cricket match?

A magnet of magnetic moment M and pole strength m is divided in two equal parts, then magnetic moment of each part will be

(a) M

(b) M/2

(c) M/4

(d) 2M

Bernoulli's theorem is based on conservation of:
  1. Momentum.
  2. Mass.
  3. Energy.
  4. Angular momentum.

The intensity of gamma radiation from a given source is I. On passing through  36 mm of lead, it is reduced to  . The thickness of lead which will reduce the intensity to   will be

(a) 18 mm

(b) 12 mm

(c) 6 mm 

(d) 9 mm

Light wave is travelling along y-direction. If the corresponding   vector at any time is along the x-axis, the direction of   vector at that time is along

(a) y-axis

(b) x-axis

(c) + z-axis

(d) – z axis

Assertion  :   A laser beam 0.2 W power can drill holes through a metal sheet, whereas 1000 W torch-light cannot.   

Reason     : The frequency of laser light is much higher then that of torch light.

(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.

(d) If the assertion and reason both are false.