Current Electricity - Electromagnetism - Physics Previous Year Questions

1

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

A piece of copper is to be shaped into a conducting wire of maximum resistance. The suitable length and diameter are ......................and............................respectively.

A

$2 L$ and $d / 2$

B

$L / 2$ and $2 d$

C

Landd

D

$2 L$ and $d$

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2

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

A galvanometer of resistance $50 \Omega$ is connected to a battery of $3 \cdot \mathrm{~V}$ along with a${ }^{\text { }}$ resistance of $2950 \Omega$ in series shows full-scale deflection of 30 divisions. The additional series resistance required to reduce the deflection to 20 divisions is

A

$2950 \Omega$

B

$1500 \Omega$

C

$4440 \Omega$

D

$7400 \Omega$

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3

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

A cylindrical conductor of diameter 0.1 mm carries a current of 90 mA . The current density ( in $\mathrm{Am}^{-2}$ ) is ( $\pi \approx 3$ )

A

$1.2 \times 10^7$

B

$3 \times 10^6$

C

$6 \times 10^6$

D

$2.4 \times 10^7$

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4

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

The power dissipated in $3 \Omega$ resistance in the following circuit is

A

0.25 W

B

0.75 W

C

1 W

D

0.5 W

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5

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

Of the following graphs, the one that correctly represents the $I-V$ characteristics of a 'Ohmic device' is

A

B

C

D

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6

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

$$\text { The value of } I \text { in the figure shown below is }$$

A

21 A

B

4 A

C

8 A

D

19 A

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7

2017 · Physics · Electromagnetism · Current Electricity

KCET 2017

In meter bridge experiment, with a standard resistance in the right gap and a resistance coil dipped in water (in a beaker) in the left gap, the balancing length obtained is ' $l$ '. If the temperature of water is increased, the new balancing

A

$<1$

B

$>1$

C

$=0$

D

$=1$

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8

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

If the last band on the carbon resistor is absent, then the tolerance is

A

$5 \%$

B

$20 \%$

C

$10 \%$

D

$15 \%$

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9

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

Ohm's law is applicable to

A

diode

B

transistor

C

electrolyte

D

conductor

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10

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

The resistance $R=\frac{V}{I}$, where $V=(100 \pm 5) \mathrm{V}$ and $I=(10 \pm 0.2) \mathrm{A}$. The percentage error in $R$ is

A

$5.2 \%$

B

$4.8 \%$

C

$7 \%$

D

$3 \%$

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11

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

The effective resistance between $P$ and $Q$ for the following network is

A

$\frac{1}{12} \Omega$

B

$21 \Omega$

C

$12 \Omega$

D

$\frac{1}{21} \Omega$

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12

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

Five identical resistors each of resistance $R=1500 \Omega$ are connected to a 300 V battery as shown in the circuit. The reading of the ideal ammeter $A$ is

A

$\frac{1}{5} \mathrm{~A}$

B

$\frac{3}{5} \mathrm{~A}$

C

$\frac{2}{5} A$

D

$\frac{4}{5} A$

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13

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

The $I-V$ graphs for two different electrical appliances $P$ and $Q$ are shown in the diagram: If $R_P$ and $R_Q$ be the resistances of the devices, then

A

$R_P=R_Q$

B

$R_P>R_Q$

C

$R_P

D

$R_P=\frac{R_Q}{2}$

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14

2018 · Physics · Electromagnetism · Current Electricity

KCET 2018

Two cells of internal resistances $r_1$ and $r_2$ and of same emf are connected in series, across a resistor of resistance $R$. If the terminal potential difference across the cells of internal resistance $r_1$ is zero, then the value of $R$ is

A

$R=2\left(r_1+r_2\right)$

B

$R=r_2-r_1$

C

$R=r_1-r_2$

D

$R=2\left(r_1-r_2\right)$

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15

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

Though the electron drift velocity is small and electron charge is very small, a conductor can carry an appreciably large current because

A

electron number density is very large

B

drift velocity of electron is very large

C

electron number density depends on temperature

D

relaxation time is small

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16

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

In the given circuit, the current through 2\(\Omega\) resistor is

A

0.2 A

B

0.3 A

C

0.4 A

D

0.1 A

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17

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

The readings of ammeter and voltmeter in the following circuit are respectively

A

\(1.2 \mathrm{~A}, 120 \mathrm{~V}\)

B

\(1.5 \mathrm{~A}, 100 \mathrm{~V}\)

C

\(2.7 \mathrm{~A}, 220 \mathrm{~V}\)

D

\(2.2 \mathrm{~A}, 220 \mathrm{~V}\)

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18

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

In a potentiometer experiment, the balancing point with a cell is at a length \(240 \mathrm{~cm}\). On shunting the cell with a resistance of \(2 \Omega\), the balancing length becomes \(120 \mathrm{~cm}\). The internal resistance of the cell is

A

\(4 \Omega\)

B

\(2 \Omega\)

C

\(1 \Omega\)

D

\(0.5 \Omega\)

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19

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

Kirchhoff 's junction rule is a reflection of

A

conservation of current density vector

B

conservation of energy

C

conservation of momentum

D

conservation of charges

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20

2019 · Physics · Electromagnetism · Current Electricity

KCET 2019

The variation of terminal potential difference \(V\) with current flowing through a cell is as shown. The emf and internal resistance of the cell are

A

\(3 \mathrm{~V}, 3 \Omega\)

B

\(3 \mathrm{~V}, 0.5 \Omega\)

C

\(6 \mathrm{~V}, 2 \Omega\)

D

\(6 \mathrm{~V}, 0.5 \Omega\)

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