Test Details

Part Test 3

Syllabus: Current Electricity

Nov 07, 8:00 AM

80 minutes

Nov 07, 10:00 PM

48.0 marks

MCQ

30 questions

Shiv Narayan Kumar

Three years of excellent teaching and mentoring experience. Aimed to provide the most effective teaching methodology to assure quality and indepth education of Science. SHIV NARAYAN SIR (Faculty of Physics )

Class Details

PHYSICS

Class 12th

PHYSICS

NEW BATCH STARTING FROM 01/04/2021 In this course we will cover all the syllabus prescribed by NCERT for students of standard 12th.

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Question Text

Question 1 :
A given resistor has the following colour scheme of the various strips on it : Brown, black, green and silver. Its value in ohm is :

Question 2 :
A bulb uses 5000J of energy in 10s, calculate its power.

Question 3 :
Ten identical batteries each of emf 2 V are connected in series to a $8 \Omega$ resistor. If the current in the circuit is 2 A, then the internal resistance of each battery is

Question 5 :
A solid spherical non-conductor of radius 5 cm has the potential of 50 V at its outer surface. The potential atits center is

Question 6 :
A potentiometer has a driving cell of negligible internal resistance. The balancing length of a Daniel cell is 5 m. If the driving cell had internal resistance, the balancing length of the same Daniel cell would have been

Question 7 :
On which one of the following the emf of a cell does not depend : 

Question 8 :
By increasing the temperature, the specific resistance of a conductor _____ and that of asemiconductor _______

Question 9 :
In a potentiometer experiment, the balancing length with a cell is 560cm. When an external resistance of I0 ohms is connected in parallel to the cell the balancing length changes by 41cm. The internal resistance of the cell in ohm is 

Question 10 :
Calculate the power of a source if it produces an energy of 250 joules in 10 sec.

Question 11 :
Between any two points in a circuit, the sum of all .............. is the same through any pathway.

Question 12 :
Two cylindrical rod have area of cross-section$A_1$ $A_2$. If $A_1$ is greater than $A_2$. Then which of the following is correct?

Question 14 :
If three resistors 2 ohm, 3 ohm and 4 ohm are connected in series, then effective resistance in a circuit will be _______ ohm.

Question 17 :
Name two factors on which the internal resistance of a cell depends.

Question 20 :
If n resistance (each R) are connected in series then their resultant will be

Question 22 :
Wires A and B have resistivities $\rho_A$ and $\rho_B$, $(\rho_B =2\rho_A)$ and have lengths $l_A$ and $l_B$. If the diameter of the wire B is twice that of A and the two wires have same resistance, then $\displaystyle\frac{l_B}{l_A}$ is:

Question 23 :
In an experiment to measure the internal resistance of a cell by a potnetiometer, it is found that the balance point is at a length of 2 m, when the cell is shunted by a 5 $\Omega$ resistance; and is at a length of 3 m, when the cell is shunted by a 10$\Omega$ resistance. The internal resistance of the cell is, then

Question 24 :
The specific resistance of a rod of copper as compared to that of thin wire of copper is

Question 25 :
Assertion: Potentiometer is used only to compare potential differences. Reason: The potentiometer draws current from the voltage source being measured.

Question 26 :
It is easier to start a car engine on a hot day than on a cold day. This is because the internal resistance of the car battery

Question 27 :
Three resistors are connected in parallel across a potential difference and a current $I$ passes through it, the resistance values are such that $R_1 < R_2 < R_3$, then the ratio of branch currents in the same order is:

Question 28 :
A wire of resistance R divided in 10 equal parts. These parts are connected in parallel. Then resistance equivalent is

Question 29 :
Assertion: Ohm's law holds only for small currents in metallic wire not for high currents Reason: For metallic wire resistance increases with decrease in temperature.

Question 30 :
Two parallel straight conductors carrying currents 5A each repel other with a force of $25 \times 10^{-5} Nm^{-1}$. The distance between the conductors is

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