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Q1. | If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes |

A. | 0.4 ohm [Correct Answer] |

B. | 0.6 ohm [Wrong Answer] |

C. | 0.8 ohm [Wrong Answer] |

D. | 1.0 ohm [Wrong Answer] |

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Explanation:-
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**Also Read Similar Questions Below :**

⇒ A network consists of linear resistors and ideal voltage source. If the value of the resistors are doubled, then voltage across each resistor is

halved.

doubled.

increased four lines.

not changed.

⇒ With rise in temperature the resistance of pure metals

increases

decreases

first increases and then decreases

remains constant

⇒ With rise in temperature the resistance of semi-conductors

decreases

increases

first increases and then decreases

remains constant

⇒ A rheostat differs from potentiometer in the respect that it

has lower wattage rating

has higher wattage rating

has large number of turns

offers large number of tappings

⇒ The insulation resistance of a cable of length 10 km is 1 Mega Ohm's. For a length of 100 km of same cable, the insulation resistance will be

1 Mega Ohm

10 Mega Ohm

0.1 Mega Ohm

0.01 Mega Ohm

⇒ Reciprocal of specific resistance is

Conductive resistance

Specific conductance

Conductive reactance

Plate resistance

⇒ How are 500 ω resistors connected so as to give an effective resistance of 750 ω ?

Three resistors of 500 ω each, in parallel

Three resistors of 500 ω each, in series.

Two resistors of 500 ω each, in parallel.

Two resistors of 500 ω each, in parallel and the combination in series with another 500 ω resistor.

⇒ The temperature coefficient of resistance of some material is negative. The material is

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Iron

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⇒ A resistance having rating 10 ohms, 10 W is likely to be a

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carbon resistor

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⇒ Which of the following quantities remain the same in all parts of a series circuit?

Voltage

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⇒ For which of the following substances the temperature co-efficient of resistivity is positive ?

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Germanium

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⇒ Three resistances of 10 ohms, 15 ohms and 30 ohms are connected in parallel. The total resistance of the combination is

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10 ohms

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⇒ Which of the following statements is correct regarding resistance?

The resistance of a conductor is the hindrance by which the conductor opposes the flow of current through it.

The resistance of wire is independent of the temperature for most of the materials

The resistance of a wire does not depend upon its material.

None of the above.

⇒ Four resistances 80 ω, 50 ω, 25 ω and R are connected in parallel. Current through 25 ω resistance is 4 A. Total current of the supply is 10 A. The value of R will be

66.66 ω

40.25 ω

36.36 ω

76.56 ω

⇒ For determining the polarity of the voltage drop across a resistor, it is necessary to know the

value of resistor.

value of current.

direction of current flowing through the resistor.

value of emf in the circuit.

⇒ The resistance of a few metres of wire conductor in closed electrical circuit is (a) practically zero (b) low

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very high

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infinite

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⇒ Voltage dependent resistors are usually made from

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⇒ Three parallel resistive branches are connected across a dc supply. What will be the ratio of the branch currents I1 : I2 : I3 if the branch resistances are in the ratio R1 : R2 : R3 : : 2 : 4 : 6 ?

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2 : 4 : 6

6 : 3 : 2

6 : 2 : 4

⇒ In an ordinary heater if the length of the coil is halved, then a given quantity of water will boil

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More time

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^{-8}ω-m

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1.6 x 10

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⇒ The temperature coefficient of resistance of a wire is 0.0008°C. If the resistance of the wire is 8 ohm at 0°C, what is the resistance at 100°C?

8.64 Ohm.

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⇒ Two resistors are said to be connected in series when

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⇒ Three resistances each of R Ω are corrected to form a triangle. The resistance between any two terminals will be

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number of free electrons available become more.