Test Details

Current Electricity

MCQs

Dec 08, 9:00 AM

200 minutes

Dec 08, 12:20 PM

30.0 marks

MCQ

30 questions

Yayati Keshari

You are in the class of Physics by YK sir 🙏🏾

Class Details

Physics

Class 12th (21-22)

Physics

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Question Text

Question 1 :
An electricity bulb of 100 watt is connected to supply of electricity of 220V. Resistance of filament is

Question 2 :
State whether given statement is True or False The wire of potentiometer is made up of Aluminium.

Question 3 :
A cell can be balanced against 110 cm and 100 cm of potentiometer wire, respectively with and without being short circuited through a resistance of 10 . Its internal resistance is -

Question 4 :
Which physical quantity cannot be determined with the help of potentiometer?

Question 8 :
A $10\ m$ long potentiometer wire is connected to a battery having a steady voltage. A Leclanche cell is balanced at $4\ m$ length of the wire. If the length is kept the same, but its cross-section is doubled, the null point will be obtained at:

Question 10 :
What is the power produced by an appliance marked " $240 V$, $2 A?$

Question 11 :
Kirchoffs law of junctions is also called the law of conservation of:

Question 12 :
The cells are joined in parallel to get the maximum current when

Question 13 :
If three resistors 2 ohm, 3 ohm and 4 ohm are connected in series, then effective resistance in a circuit will be _______ ohm.

Question 14 :
Calculate the current through a lamp of 25w operating at 220v.

Question 15 :
The amount of work done by the cell on a unit positive charge carrier to force it to go to the point of higher potential is called

Question 16 :
Assertion : Material used in the construction ofa standard resistance is constantan or manganin Reason : Temperature coefficients of constantan and Magnanin arevery small

Question 17 :
For a heater rated at $4 \  kW$; $220 \  V$ . Calculate the resistance of the heater element.

Question 19 :
Which is the equivalent resistance when resistors $3 \Omega$ and $6 \Omega$ are in parallel?

Question 20 :
$\displaystyle P=\frac { { V }^{ 2 } }{ R }$ is applied when

Question 22 :
Kirchhoff's law of junction, $\displaystyle \sum { I } =0$, is based on

Question 23 :
Three resistors of value $2R$, $R$, and $4R$ are wired in series to a battery with a voltage $v$. Derive an expression for the current on the resistor with a value of $R$.

Question 24 :
If the equivalent resistance is to be increased, then the number of resistances should be connected in:

Question 25 :
State whether true or false. Electric current can easily pass through a sheet of thermocol.

Question 26 :
The filament of a bulb takes a current 100 mA when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 400 mA. Calculate the resistance of filament in each case and account for the difference.

Question 27 :
The resistance of a wire at room temperature $30^o C$ is found to be $10 \Omega $. Now to increase the resistance by 10%, the temperature of the wire must be [The temperature coefficient of resistance of the material of the wire is $0.002 \,per\, ^oC$].

Question 28 :
An energy source will supply constant current into the load if its internal resistance is :

Question 30 :
If the current passing through an electric bell is doubled, the heat produced will become

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