A Wheatstone bridge is used to determine the value of unknown resistance X by adjusting the variable resistance Y as shown in the figure. For the most precise measurement of X , the resistances P and Q

should be approximately equal and are small

should be very large and unequal

do not play any significant role

should be approximately equal to 2 X

Column - I gives certain physical terms associated with flow of current through a metallic conductor. Column - II gives some mathematical relations involving electrical quantities. Match Column - I and Column - II with appropriate relations. Column - I Column - II (A) Drift Velocity P m n e 2 ρ (B) Electrical Resistivity Q n e v d (C) Relaxation Period R e E m τ (D) Current Density S E J

( A ) - ( R ) , ( B ) - ( S ) , ( C ) - ( P ) , ( D ) - ( Q )

( A ) - ( R ) , ( B ) - ( S ) , ( C ) - ( Q ) , ( D ) - ( P )

( A ) · ( R ) , ( B ) - ( P ) , ( C ) - ( S ) , ( D ) - ( Q )

( A ) - ( R ) , ( B ) - ( Q ) , ( C ) - ( S ) , ( D ) - ( P )

For the circuit given below, the Kirchhoff's loop rule for the loop B C D E B is given by the equation

i 2 R 2 + E 2 - E 3 - i 3 R 1 = 0

- i 2 R 2 + E 2 - E 3 + i 3 R 1 = 0

i 2 R 2 + E 2 + E 3 + i 3 R 1 = 0

- i 2 R 2 + E 2 + E 3 + i 3 R 1 = 0

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Which of the following acts as a circuit protective device?

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Important Questions on Current Electricity

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 5th May 2019>Q 20

In the circuits shown below, the readings of the voltmeters and the ammeters will be,

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 6th May 2018>Q 22

A set of

n

equal resistances, of value

R

each, are connected in series to a battery of emf

E

and internal resistances

R

. The current drawn is

I

. Now, the

n

resistance are connected in parallel to the same battery. Then the current drawn from battery becomes

10 I

. The value of

n

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 6th May 2018>Q 23

A battery consists of a variable number 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terminals of the battery are short-circuited and the current

I

is measured. Which of the graphs shows the correct relationship between

I

and n?

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 7th May 2017>Q 24

The resistance of a wire is

R

ohm. If it is melted and stretched to

n

times its original length, its new resistance will be

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 24th July 2016>Q 26

The potential difference $(V_{A} - V_{B})$ between the points $A$ and $B$ in the given figure is
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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 24th July 2016>Q 27

A filament bulb

(500 W, 100 V)

is to be used in a

230 V

main supply. When a resistance,

R

is connected in series, it works perfectly and the bulb consumes

500 W

. The value of

R

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>NEET - 1st May 2016>Q 28

The charge flowing through a resistance

R

varies with time

t

Q = a t - b t^{2}

where

a

and

b

are positive constants. The total heat produced in

R

is:

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EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>AIPMT - 3rd May 2015>Q 31

Across a metallic conductor of non-uniform cross section a constant potential difference is applied. The quantity which remains constant along the conductor is:

Which of the following acts as a circuit protective device?

Important Questions on Current Electricity

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