Current Electricity Test

Result

Current Electricity Test - 71

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Weekly Quiz Competition

Question 1
1 / -0

The peak value of an alternating e.m.f. which is given by $$E={ E }_{ 0 }$$$$\omega $$ is 10 volts and its frequency is 50 Hz. At time $$t=\dfrac { 1 }{ 600 } $$ s, The instantaneous e.m.f.

A
10 V

B
$$5\sqrt { 3 } V$$

C
5 V

D
1 V

Solution
Question 2
1 / -0

The length of a potentiometer wire is $$l$$. A cell of emf E is balanced at a length $$\dfrac{l }{ 3}$$ from the positive end of the wire. If the length of the wire is increased by $$\dfrac{l} { 2}$$.
At what distance will the same cell give a balance point?

A
$$

\dfrac{2l}{3}

$$

B
$$

\dfrac{l}{2}

$$

C
$$

\dfrac{l}{6}

$$

D
$$

\dfrac{4l}{3}

$$

Solution
Question 3
1 / -0

Current in a circuit falls from $$5.0$$A to $$0.0$$A in $$0.1$$S. If an average emf of $$200$$V induced, given an estimate of the self-inductance of the circuit.

A
$$4$$H

B
$$40$$H

C
$$0.4$$H

D
$$0.04$$H

Solution

Change in current $$dI=5-0=5$$A
$$dt=0.1$$s
$${E}_{av}=200$$V
$$e=L\dfrac{dI}{dt}$$
$$\therefore 200=L\left(\dfrac{5}{0.1}\right)$$
$$\Rightarrow L=\dfrac{200}{50}=4$$H
Question 4
1 / -0

The equivalent resistance between A and B in the following figure is

A
$$120\Omega $$

B
$$40\Omega $$

C
$$30\Omega $$

D
$$22.5\Omega $$

Solution
Question 5
1 / -0

Two cells of e.m.f. $$ E_1 = 8$$V and $$E_2 = 4V, $$ with internal resistance 1 ohm and 2 ohm respectively are connected so that they oppose each other. this combination of cells is connected to an external resistance of 5 ohm. the terminal potential difference across the cell $$ E_2 $$ is :

A
$$7.5V$$

B
$$3.0V$$

C
$$4.0V$$

D
$$5.0V$$

Solution
Question 6
1 / -0

Kirchhoff's first law is based on the law of conservation of.

A
Charge

B
Energy

C
Momentum

D
Sum of mass and energy

Solution
Question 7
1 / -0

For the circuit shown in figure given below, the equivalent resistance between points A and B is

A
$$10\Omega$$

B
$$5\Omega$$

C
$$\dfrac{10}{3} \Omega$$

D
$$2\Omega$$

Solution
Question 8
1 / -0

Kirchhoff's first law at a junction is based on conservation of

A
Angular momentum

B
Mass

C
Charge

D
Energy

Solution
Question 9
1 / -0

In Fig.,value of $${ I }_{ x }and\quad { I }_{ y }$$ are respectively

A
1A,1A

B
1.2A,1.2A

C
0.8A,0.8A

D
1A,1.2A

Solution
Question 10
1 / -0

In metre 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 length is

A
>l

B
none

C
=0

D
=l

Solution

$$\begin{array}{l} \frac { { { R_{ unknown } } } }{ { { R_{ s\tan dard } } } } =\frac { l }{ { \left( { 1-l } \right) } } . \\ If\, \, temperature\, \, increases,\, \, resis\tan ce\, \, increases. \end{array}$$
Hence, Option $$A$$ is correct.