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Q1. | The hot resistance of the filament of a bulb is higher than the cold resistance because the temperature coefficient of the filament is |

A. | negative. [Wrong Answer] |

B. | infinite. [Wrong Answer] |

C. | zero. [Wrong Answer] |

D. | positive. [Correct Answer] |

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

⇒ Which resistor will be physically larger in size?

100ω, 10W

10ω, 50W

1Mω, 1/2W

1kω, 1W

⇒ The temperature coefficient of resistance of an insulator is

positive and independent oftemperature.

negative and independent of temperature.

negative and dependent on temperature.

positive and dependent on temperature

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

Copper

Aluminium

Iron

Gennanium

⇒ Which of the following is an ohmic conductor?

Transistors

Thermionic valves

Constanton

Electrolyte

⇒ Which of tite following materials has the least resistivity?

Zinc

Lead

Mercury

Copper

⇒ 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.

⇒ Heat in a conductor is produced on the passage of electric current due to

reactance

capacitance

impedance

resistance

⇒ A current of 16 amperes divides between two branches in parallel of resistances 8 ohms and 12 ohms respectively. The current in each branch is

6.4 A, 6.9 A

6.4 A, 9.6 A

4.6A, 6.9A

4.6A,9.6A

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

practically zero

low

high

very high

⇒ The resistance of a conductor varies inversely as

length

area of cross-section

temperature

resistivity

⇒ The specific resistance of all metals is most affected by

Temperature

Pressure

Degree of illumination

Applied magnetic field

⇒ If a wire conductor of 0.2 ohm resistance is doubled in length, its resistance becomes

0.4 ohm

0.6 ohm

0.8 ohm

1.0 ohm

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

Less time

More time

Same time

None of these

⇒ Temperature co-efficient of resistance is expressed in terms of

obms/°C

mhos/ohm°C

ohms/ohm°C

mhos/°C

⇒ 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

⇒ The specific resistance of a wire depends upon

Its length

Its cross-sectional area

Its dimensions

Its material

⇒ 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 ?

3 : 2 : 6

2 : 4 : 6

6 : 3 : 2

6 : 2 : 4

⇒ With rise in temperature the resistance of semi-conductors

decreases

increases

first increases and then decreases

remains constant

⇒ You have to replace 1500 ω resistor in radio. You have no 1500 ω resistor but have several 1000 ω ones which you would connect

two in parallel

two in parallel and one in series

three in parallel

three in series

⇒ Specific resistance of a conductor depends upon

dimensions of the conductor.

composition of conductor material.

resistance of the conductor

both (a) and (b).

⇒ Four wires of same material, the same cross-sectional area and the same length when connected in parallel give a resistance of 0.25 ω. If the same four wires are connected is series the effective resistance will be

1 ω

2 ω

3 ω

4 ω

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

5 ohms

10 ohms

15 ohms

55 ohms

⇒ An open resistor, when checked with an ohm-meter reads

zero

infinite

high but within tolerance

low but not zero

⇒ In a circuit containing two unequal resistors connected in parallel

The current is same in both the resistors

The current is larger in larger resistance

The voltage drop is same across both the resistances

The voltage drop is larger across larger resistances

⇒ With three resistances connected in parallel, if each dissipates 20 W the total power supplied by the voltage source equals

10 W

20 W

40 W

60 W

⇒ The example of non-ohmic resistance is

Copper wire

Carbon resistance

Diode

Tungsten wire

⇒ 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.

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

Carbon

Germanium

Electrolyte

Aluminium

⇒ Resistance of a material always decreases if

temperature of material is decreased

temperature of material is increased

number of free electrons available become more

none of the above is correct

⇒ Two resistors are said to be connected in series when

same current passes in turn through both

both carry the same value of current

total current equals the sum of branch currents

sum of IR drops equals the applied e.m.f.