Test Details

Current Electricity

Physics test

Oct 19, 10:05 AM

60 minutes

Oct 19, 11:05 AM

20.0 marks

MCQ

20 questions

Dinesh Kapri -dk

Class Details

Physics

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

Physics

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Question Text

Question 1 :
The current in a wire is doubled keeping temperature constant. Which of the following statements is/are wrong?

Question 4 :
An electric cell does 5 joules of work in carrying 10-coulomb charge around the closed circuit. The electromotive force of the cell is :

Question 5 :
As the temperature of a conductor increases, its resistivity and conductivity change. The ratio of resistivity to conductivity<br>

Question 6 :
The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimumpossible value of n is

Question 7 :
If n resistance (each R) are connected in series then their resultant will be

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

Question 11 :
We have n resistors each of resistance R. The ratio of the combination for maximum and minimum values is

Question 12 :
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 14 :
If a copper wire is stretched to make it 0.1% longer, the percentage increases in resistance will be

Question 15 :
The specific resistance of a rod of copper as compared to that ofthin wire of copper is

Question 16 :
A lamp of 6 V and 30 W is used in a laboratory but the supply is of 120 V. what will be done to make use of the lamp?<br>(1)A resistance may be used<br>(2)A resistance may be used in series with lamp.<br>(3) The resistance should be of 18 $$\Omega$$.

Question 18 :
Which among the following is the commercial unit of electric power?

Question 19 :
Resistance of a platinum resistance thermom-eter is 2 ohm at $$ 20^\circ C $$, 4ohm at $$ 100^\circ C $$ and 2.2 ohm at some temperature. this temperature-is

Question 20 :
Two sources of equal emf are connected to an external resistance R. The internal resistance of the two sources are $$R_1$$ and $$R_2$$ $$(R_2 > R_1)$$. If the potential difference across the source having internal resistance $$R_2$$ is zero, then.

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