NEET 2020 Revision: Current Electricity - 1

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Question 1

The V-I graph of a metallic wire at different temperatures T_A, T_B, T_C, and T_D. Rank the temperature in descending order.

• AA > B > C > D
• BD > B > C > A
• CA > C > D > B
• DData is insufficient

Question 2

In the given circuit what will be the value of R so that current flowing through the circuit is 2A. Assume battery has negligible resistance.

• A
• B
• C
• D

Question 3

Choose the most appropriate answer to why resistivity increases with the increase in temperature in most materials?

• ABecause velocity of electrons increases leading to frequent collisions.
• BBecause atomic space increases.
• CBecause more electrons become bounded to move.
• DBecause dimensions of material changes due to heat.

Question 4

What is the current density if resistivity of a material is and the applied electric field is 4 V/m?

• Aamp/m.
• Bamp/m².
• Camp/m.
• Damp/m².

Question 5

Dimensional formula of mobility ‘’ is :

• A
• B
• C
• D

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