Question
The electrical resistivities of five substances A, B, C, D and E are given below:
$\begin{matrix}\text{B}&110\times10^{-8}\Omega\text{ m}\\\text{C}&2.60\times10^{-8}\Omega\text{ m}\\\text{D}&10.0\times10^{-8}\Omega\text{ m}\\\text{E}&1.70\times10^{-8}\Omega\text{ m}\end{matrix}$

Answer

  1. E is best conductor of electricity due to its least electrical resistivity.
  2. C, because its resistivity is lesser than that of A.
  3. B, because it has the highest electrical resistivity.
  4. C and E, because of their low electrical resistivities.

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

i. Write the correct sequence of steps followed during journey of oxygen rich blood from lungs to various organs of human body.
ii. What happens when the system of blood vessels develop a leak?
What is a ‘food web’? Show its formation.
Define an ecosystem. Draw a block diagram to show the flow of energy in an ecosystem.
State the important precautions which should be observed in the use of electricity.
Nikita took Zn, Al, Cu, Fe, Mg and Na metal and put each metal in cold water and then hot water. She reacted the metal with steam
(i) Name the metal which reacts with cold water.
(ii) Which of the above metals react with steam?
(iii) Name the metal which reacts with hot water.
(iv) Arrange these metals in order of increasing reactivity.
Where in period 3 of the modern periodic table do we find:
  1. Non-metals?
  2. Elements forming negative ions?
  3. Elements with high melting points?
  4. Elements forming positive ions?
  5. Metals?
  6. Elements with low boiling points?
Mention their atomic numbers only.
Draw circuit symbols for:
  1. Fixed resistance.
  2. Variable resistance.
  3. A cell.
  4. A battery of three cells.
  5. An open switch.
  6. A closed switch.
A concave mirror produces three times enlarged virtual image of an object placed at 10cm in front of it. Calculate the radius of curvature of the mirror.
Calculate the power used in the $2Ω$ resistor in each of the following circuits:
  1. A 6V battery in series with $1Ω$ and $2Ω$ resistors.
  2. A 4V battery in parallel with $12Ω$ and $2Ω$ resistors.
Describe how petroleum was formed in the earth.