Assertion (A): In a meter bridge experiment null point for an unknown resistance is put inside an enclosure maintained at a higher temperature. The null point can be obtained at the same point as before by increasing the value of the standard resistance. 
Reason (R): Resistance of metal increases with an increase in temperature.
 
1. If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
 
2. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
 
3. If Assertion is true but Reason is false.
 
4. If both Assertion and Reason are false.

Concept Questions :-

Wheatstone bridge
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A circuit contains an ammeter, a battery of 30 V, and a resistance 40.8 Ω all connected in series. If the ammeter has the coil of resistance 480 Ω and a shunt of 20 Ω, then reading in the ammeter will be:

1. 0.5 A

2. 0.02 A

3. 2 A

4. 1 A

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In the circuit shown, the current through the 4 Ωresistor is 1 A when the points P and M are connected to a DC voltage source. The potential difference  between the points M and N is 

1. 1.5 V 

2. 1.0 V

3. 0.5 V 

4. 3.2 V

Concept Questions :-

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

(a) 1.0 Ω

(b) 0.5 Ω

(c) 2.0 Ω

(d) zero 

Concept Questions :-

Grouping of cells
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An electric kettle takes 4 A current at 220 V. How much time will it take to boil 1 kg of water from temperature 20°C? The temperature of boiling water is 100°C

(a) 6.3 min

(b) 8.4 min

(c) 12.6 min

(d) 4.2 min

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A wire of a certain material is streched slowly by ten per cent. Its new resistance and specific resistance become respectively 

(a) 1.2 times, 1.1 times

(b) 1.21 times,same 

(c) both remain the same

(d) 1.1 times, 1.1 times

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A current of 3A flows through the 2Ω resistor shown in the circuit. The power dissipated in the 5Ω resistor is

 

(a) 4 W                                              (b) 2 W

(c) 1 W                                              (d) 5 W

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See the electrical circuit shown in this figure. Which of the following equation is a correct equation for it?

1. ε1-i1+i2R-i1r1=0

2. ε2-i2r2-ε1-i1r1=0

3. -ε2-i1+i2R+i2r2=0

4. ε1-i1+i2R+i1r1=0

Concept Questions :-

Kirchoff's voltage law
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A student measures the terminal potential difference (V) of a cell (of emf ε and internal resistance r) as a function of the current (I) flowing through it. The slope and intercept of the graph between V and I, then respectively, equal :

(a) ε and r                               (b) r and ε

(c) r and ε                               (d) ε and r

Concept Questions :-

Emf and terminal voltage
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A wire of resistance 12 Ωm-1 is bent to form a complete circle of radius 10 cm. The resistance between its two diametrically opposite points, A and B as shown in the figure, is :

                         

(a) 0.6 π Ω                                               (b) 3 Ω

(c) 6 π Ω                                                  (d) 6 Ω

 

Concept Questions :-

Combination of resistors
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Difficulty Level: