NEET 2020 Revision: Current Electricity - 3

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Question 1

Find the current in the 2Ω resistor in the middle section.

• A3.9A
• B3.2A
• C2.8A
• D2.9A

Question 2

Which of the following is true?

• AWheatstone bridge is used to find two unknown resistances.
• BPotentiometer is used to find two resistances.
• CPotentiometer is used to compare two resistances.
• DPotential drop across a cross section of wire in potentiometer is proportional to square of length of wire.

Question 3

See the electrical circuit shown in this figure. Which of the following equations is a correct equation for it?

• A
• B
• C
• D

Question 4

The total power dissipated in watts in the circuit shown here is:

• A16
• B40
• C54
• D4

Question 5

A wire of a certain material is stretched slowly by ten per cent. lts new resistance and specific resistance become respectively

• A1.2 times, 1.1 times
• B1.21 times, same
• Cboth remain the same
• D1.1 times, 1.1 times

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