A metallic resistor is connected across a battery. If the number of collisions of the free electrons with the lattice is somehow decreased in the resistor (for example, by cooling it), the current will:

 1 increase 2 decrease 3 remain constant 4 become zero
Subtopic:  Derivation of Ohm's Law |
60%
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Two resistors A and B have resistances RA and RB respectively with RA < RB . The resistivities of their materials are ρA and ρB

1.   ρA > ρ

2.   ρA = ρB

3.   ρA < ρ

4.   The information is not sufficient to find the relation between ρA and ρB

Subtopic:  Derivation of Ohm's Law |
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The product of resistivity and conductivity of a cylindrical conductor depends on

1.   temperature

2.   material

3.   area of cross-section

4.   none of these.

Subtopic:  Derivation of Ohm's Law |
56%
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As the temperature of a metallic resistor is increased, the product of its resistivity and conductivity:

 1 increases 2 decreases 3 remains constant 4 may increase or decrease
Subtopic:  Derivation of Ohm's Law |
76%
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In an electric circuit containing a battery, the charge (assumed positive) inside the battery:

 1 always goes from the positive terminal to the negative terminal. 2 may go from the positive terminal to the negative terminal. 3 always goes from the negative terminal to the positive terminal. 4 does not move.
Subtopic:  Grouping of Cells |
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A resistor of resistance $$R$$ is connected to an ideal battery. If the value of $$R$$ is decreased, the power dissipated in the resistor will:

 1 increase 2 decrease 3 remains unchanged 4 can't be determined
Subtopic:  Heating Effects of Current |
68%
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A current passes through a resistor. Let K1 and K2 represent the average kinetic energy of the conduction electrons and the metal ions respectively.

1.   K1 < K2

2.   K1 = K2

3.   K1 > K2

4.   Any of these three may occur

Subtopic:  Current & Current Density |
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Two resistors $$R$$ and $$2R$$ are connected in series in an electric circuit. The thermal energy developed in $$R$$ and $$2R$$ are in the ratio of:
1. $$1:2$$
2. $$2:1$$
3. $$1:4$$
4. $$4:1$$

Subtopic:  Heating Effects of Current |
79%
From NCERT
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Two resistances R and 2R are connected in parallel in an electric circuit. The thermal energy developed in R and 2R are in the ratio

1.   1 : 2

2.   2 : 1

3.   1 : 4

4.   4 : 1.

Subtopic:  Heating Effects of Current |
75%
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A uniform wire of resistance $$50~\Omega$$  is cut into $$5$$ equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is:

 1 $$2~\Omega$$  2 $$10~\Omega$$  3 $$250~\Omega$$  4 $$6250~\Omega$$
Subtopic:  Derivation of Ohm's Law |
75%
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