MCQ
The resistance of a metal increases with increasing temperature because:
  • The collisions of the conducting electrons with the electrons increase.
  • B
    The collisions of the conducting electrons with the lattice consisting of the ions of the metal increase.
  • C
    The number of conduction electrons decreases.
  • D
    The number of conduction electrons increases.

Answer

Correct option: A.
The collisions of the conducting electrons with the electrons increase.

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

The mass number of a nucleus is:
Laser beams are used to measure long distance because
Assertion : The induced e.m.f. and current will be same in two identical loops of copper and aluminium, when rotated with same speed in the same magnetic field.
Reason : Induced e.m.f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.
The resultant capacitance of given circuit is
The decay constant of a radio isotope is $\lambda$. If  $A_1$ and $A_2$ are its activities at times $t_1$ and $t_2$  respectively, the number of nuclei which have decayed during the time $(t_1 - t_2)$ 
The effective value of current $i = 2\, sin\, 100\, \pi\, t + 2 \,sin(100\, \pi \,t + 30^o)$ is :
The atomic mass of ${ }_6 \mathrm{C}^{12}$ is $12.000000\ \mathrm{u}$ and that of ${ }_6 \mathrm{C}^{13}$ is $13.003354 \ \mathrm{u}$. The required energy to remove a neutron from ${ }_6 \mathrm{C}^{13}$, if mass of neutron is $1.008665 \ \mathrm{u}$, will be :
An image of the sun is formed by a lens of focal length of 30 cm on the metal surface of a photoelectric cell and a photoelectric current I is produced. The lens forming the image is then replaced by another of the same diameter but of focal length 15 cm. The photoelectric current in this case is
The work functions for sodium and copper are 2eV and 4eV. Which of them is suitable for a photocell with 4000 Å light
The phase difference between the flux linked with a coil rotating in a uniform magnetic field and induced $e.m.f.$ produce in it is