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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 |

58%

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Two resistors A and B have resistances R_{A} and R_{B} respectively with R_{A} < R_{B} . The resistivities of their materials are ρ_{A }and ρ_{B}

1. ρ_{A} > ρ_{B }

2. ρ_{A }= ρ_{B}

3. ρ_{A} < ρ_{B }

4. The information is not sufficient to find the relation between ρ_{A} and ρ_{B}

Subtopic: Derivation of Ohm's Law |

From NCERT

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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%

From NCERT

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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 |

77%

From NCERT

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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. remain unchanged.

4. Can't be determined.

Subtopic: Heating Effects of Current |

68%

From NCERT

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A current passes through a resistor. Let K_{1} and K_{2} represent the average kinetic energy of the conduction electrons and the metal ions respectively.

1. K_{1 }< K_{2}

2. K_{1} = K_{2}

3. K_{1} > K_{2}

4. Any of these three may occur

Subtopic: Current & Current Density |

From NCERT

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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 |

78%

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 |

74%

From NCERT

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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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