# 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. remain unchanged. 4. Can't be determined.

Subtopic:  Heating Effects of Current |
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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 |
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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 |
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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 |
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Consider the following two statements:

 Statement I: Kirchhoff’s junction law follows from the conservation of charge. Statement II: Kirchhoff’s loop law follows from the conservative nature of the electric field.

 1 Both Statement I and Statement II are correct. 2 Statement I is correct but Statement II is incorrect. 3 Statement I is incorrect but Statement II is correct. 4 Both Statement I and Statement II are incorrect.

Subtopic:  Kirchoff's Voltage Law | Kirchoff's Current Law |
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Two non-ideal batteries are connected in series. Consider the following statements:

 A: The equivalent emf is larger than either of the two emfs. B: The equivalent internal resistance is smaller than either of the two internal resistances.

 1 Each of A and B is correct. 2 A is correct but B is wrong. 3 B is correct but A is wrong. 4 Each of A and B is wrong.
Subtopic:  Grouping of Cells |
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Two non-ideal batteries are connected in parallel. Consider the following statements:

 Statement-I: The equivalent emf is smaller than either of the two emfs. Statement-II: The equivalent internal resistance is smaller than either of the two internal resistances.

 1 Both Statement I and Statement II are correct. 2 Statement I is correct but Statement II is wrong. 3 Statement II is correct but Statement I is wrong. 4 Both Statement I and Statement II are wrong
Subtopic:  Grouping of Cells |
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Electrons are emitted by a hot filament and are accelerated by an electric field as shown in the figure. The two stops at the left ensure that the electron beam has a uniform cross-section.

(a) The speed of the electron is more at B than at A.
(b) The electric current is from left to right.
(c) The magnitude of the current is larger at B than at A.
(d) The current density is more at B than at A

Choose the correct option

1. (a) only

2. (b), (c)

3. (c), (d)

4. (a), (d)

Subtopic:  Current & Current Density |
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When no current is passed through a conductor,

 (a) the free electrons do not move. (b) the average speed of a free electron over a large period of time is zero. (c) the average velocity of a free electron over a large period of time is zero. (d) the average of the velocities of all the free electrons at an instant is zero.

Choose the correct option:
1. (a) only
2. (b), (c)
3. (c), (d)
4. (a), (d)

Subtopic:  Current & Current Density |
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