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

EASY

NEET

IMPORTANT

Earn 100

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 $n$ is

85.71% studentsanswered this correctly

Important Questions on Current Electricity

EASY

NEET

IMPORTANT

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?

EASY

NEET

IMPORTANT

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

EASY

NEET

IMPORTANT

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
Question Image

MEDIUM

NEET

IMPORTANT

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

EASY

NEET

IMPORTANT

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:

EASY

NEET

IMPORTANT

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:

EASY

NEET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>AIPMT - 25th July 2015>Q 32

Two metal wires of identical dimensions are connected in series. If

v_{1}

and

v_{2}

are the conductivities of the metal wires respectively, the effective conductivity if the combination is:

EASY

NEET

IMPORTANT

EMBIBE CHAPTER WISE PREVIOUS YEAR PAPERS FOR PHYSICS>Chapter 13 - Current Electricity>AIPMT - 25th July 2015>Q 33

In the given figure, a diode

D

is connected to an external resistance

R = 100 Ω

and an

e m f

3.5 V

If the barrier potential developed across the diode is

0.5 V

, the current in the circuit will be

Question Image

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 10I . The value of n is

Important Questions on Current Electricity

Learn and Prepare for any exam you want !