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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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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Which of the following quantities do not change when a resistor connected to a battery is heated due to the current?

(a) drift speed
(b) resistivity
(c) resistance
(d) the number of free electrons

Choose the correct option: 

1. (d) only  2. (b), (c) 
3. (c), (d)  4. (a), (d) 
Subtopic:  Derivation of Ohm's Law |
 52%
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