Test Details

Electric Charges and Fields, Electrostatic Potential and Capacitance and 4 other Topics

Dec 07, 8:00 PM

120 minutes

Dec 09, 6:00 PM

30.0 marks

MCQ

30 questions

Dinesh Kapri -dk

Class Details

Physics

Class 12th, ( C,D,E,F )

Physics

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Question Text

Question 1 :
The amount of work done is increasing the voltage across the plates of a capacitor from $5V$ to $10V$ is $W$. The work done in increasing it from $10V$ to $15V$ will be :

Question 2 :
The energy stored in a sphere of $10$ cm radius when the sphere is charged to a potential difference of $300$ V is

Question 3 :
The potential energy of system of two equal negative point charges of $2\mu C$ each held 1 m apart in air is ($k = 9 \times 10^9\, SI \,unit$)

Question 4 :
If a capacitor having capacitance of $1200\mu F$ is charged at a uniform rate of $100\mu C/s$, what is the time required to increase its potential by $20$ volts?

Question 5 :
A parallel plate capacitor of $1\mu F$ capacity is discharging through a resister. If its energy reduces to half in one second. The value of resistance will be?

Question 7 :
Rate at which electric work is done is called as ?

Question 9 :
If the current passing through an electric bell is doubled, the heat produced will become

Question 10 :
What is the total emf, when three cells of emfs  $2V$, $2V$, $2V$ connected in parallel?

Question 11 :
Assertion(A): An inductor in a D.C. circuit opposes both a steady current and a changing current.Reason(R): Induced emf is generated only when the flux linked with the inductor remains unchanged.

Question 12 :
Foran inductorcoil $L = 0.04H$ then work done by source to establish a current of 5A in it is:-

Question 16 :
Materials which allow larger currents to flow through them are called :

Question 17 :
The charge is negative, then the electric lines of forces are 

Question 18 :
Total Electric flux at a point in an electric field is

Question 20 :
Two point charges $+3\mu C$ and $+8\mu C$ repel each other with a force of $40 N$. If a charge of $-5\mu C$ is added to each of them, the force between them will become:

Question 22 :
In an oscillating LC circuit the maximum charge on the capacitor is $Q$. The charge on capacitor when the energy is stored equally between electric and magnetic field is :

Question 23 :
Assertion (A): More the turns more is the resistance Reason(R): Impedance of primary and secondary in a transformer is directly proportional to number of turns in the coils.

Question 24 :
A transformer connected to $220$ volt line shows an output of $2A$ at $11000V$. The efficiency is $100$%. The current drawn from the line is:

Question 28 :
A large solenoid of windings of 400 turns per meter carries a current 5A. The magnetic field at the centre of the solenoid is about:

Question 29 :
Assertion: The magnetic field at the ends of a very long current carrying solenoid is half of that at the centre. Reason: If the solenoid is sufficiently long, the field within it is uniform.

Question 30 :
A solenoid have the self inductance 2H. It length of the solenoid is doubled having turn density and area constant then new self inductance is going to be the:-

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