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# Match the Following, Integer Value of Current Electricity, Past year Questions JEE Advance, Class 12 JEE Notes | EduRev

## Class 12 Physics 35 Years JEE Mains &Advance Past year Paper

Created by: Abhishek Kapoor

## JEE : Match the Following, Integer Value of Current Electricity, Past year Questions JEE Advance, Class 12 JEE Notes | EduRev

The document Match the Following, Integer Value of Current Electricity, Past year Questions JEE Advance, Class 12 JEE Notes | EduRev is a part of the JEE Course Class 12 Physics 35 Years JEE Mains &Advance Past year Paper.
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Each question contains statements given in two columns, which have to be matched. The statements in Column-I are labelled A, B, C and D, while the statements in Column-II are labelled p, q, r and s. Any given statement in Column-I can have correct matching with ONE OR MORE statement(s) in Column-II. The appropriate bubbles corresponding to the answers to these questions have to be darkened as illustrated in the following example :

If the correct matches are A-p, s and t; B-q and r; C-p and q; and D-s then the correct darkening of bubbles will look like the given.

Q.1. Column I gives some devices and Column II gives some processes on which the functioning of these devices depend. Match the devices in Column I with the processes in Column II and indicate your answer by darkening appropriate bubbles in the 4 Ã— 4 matrix given  in the  ORS.

 Column I Column II (A) Bimetallic strip (p) Radiation from a hot body (B) Steam engine (q) Energy conversion (C) Incandescent lamp (r) Melting (D) Electric fuse (s) Thermal expansion of solids

Ans. A â†’ s; B â†’ q; C â†’ p, q; D â†’q, r

Solution.

A â†’ s

Reason : Bimetallic strip is based on thermal expansion of solids.

B â†’ q

Steam engine is based on energy conversion.

C â†’ p, q

Incandescent lamp is based on energy conversion and radiation from a hot body.

D â†’ q, r

Electric fuse is based on melting point of the fuse material which is turn depends on the heating effect of current.

Q.2. When two identical batteries of internal resistance 1Î© each are connected in series across a resistor R, the rate of heat produced in R is J1. When the same batteries are connected in parallel across R, the rate is J2. If J1 = 2.25 J2 then the value of R in Î© is

Ans.  4

Solution. Cells connected in series

Q.3. At time t = 0, a battery of 10 V is connected across points A and B in the given circuit. If the capacitors have no charge initially, at what time (in sceonds) does the voltage across them become 4 V? [Take : ln5 =1.6, ln3 = 1.1]

Ans. 2

Solution. The equivalent circuit is shown in the figure.

âˆ´The time constant Ï„ = RC = 4 sec The potential across 4Î¼F capacitor at any time â€˜tâ€™ is given as

Q.4. Two batteries of different emfs and different internal resistances are connected as shown. The voltage across AB in volts is

Ans. 5

Solution. Let i be the current flowing in the circuit. Apply Kirchhoffâ€™s law in the loop we get

â€“3 â€“ 2i â€“ i + 6 = 0

âˆ´ 3i = 3

âˆ´ i = 1 Amp

Now let us travel in the circuit from A to B through battery of 6V, we get

VA â€“ 6 + 1 Ã— 1 = VB

âˆ´ Vâ€“ VB = 5 volt.

Q.5.A galvanometer gives full scale deflection with 0.006 A current. By connecting it to a 4990 W resistance, it can be converted into a voltmeter of range 0 â€“ 30 V. If connected to 2n/249Î© resistance, it becomes an ammeter of range 0 â€“ 1.5A.The value of n is

Ans. 5

Solution.

âˆ´n â‰ˆ 5

Q.6. In the following circuit, the current through the resistor R (= 2 Î©) is I amperes. The value of I is

Ans. 1

Solution. The equivalent resistance of balanced wheatstone bridge is

The equivalent resistance of balanced wheat stone bridge is

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