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Q1. | The specific resistance of a wire depends upon |

A. | Its length [Wrong Answer] |

B. | Its cross-sectional area [Wrong Answer] |

C. | Its dimensions [Wrong Answer] |

D. | Its material [Correct Answer] |

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

⇒ 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

⇒ 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

⇒ 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.

⇒ 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

⇒ 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.

8.08 Ohm.

7.92 Ohm.

7.20 Ohm

⇒ 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

⇒ N equal resistances are first connected in series and then connected in parallel. What is the ratio of the maximum to the minimum resistance ?

n

^{ 1 }^{n2}

n

^{2}

^{1}/

_{n}

⇒ Reciprocal of specific resistance is

Conductive resistance

Specific conductance

Conductive reactance

Plate resistance

⇒ Which of the following is an ohmic conductor?

Transistors

Thermionic valves

Constanton

Electrolyte

⇒ Voliage dependent resistors are used

for inductive circuits

to supress surges

as heating elements

as current stabilizers

⇒ The resistance of a straight conductor does not depend upon its

Shape of cross-section

Temperature

Material

Length

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

Voltage

Current

Power

Resistance

⇒ The example of non-ohmic resistance is

Copper wire

Carbon resistance

Diode

Tungsten wire

⇒ Conductance is reciprocal of

resistance

inductance

reluctance

capacitance

⇒ With rise in temperature the resistance of semi-conductors

decreases

increases

first increases and then decreases

remains constant

⇒ 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

⇒ The resistance of a parallel circuit consisting of two branches is 12 ohms. 1f the resistance of one branch is 18 ohms, what is the resistance of the other?

18 ω

36 ω

48 ω

64 ω

⇒ Which resistor will be physically larger in size?

100ω, 10W

10ω, 50W

1Mω, 1/2W

1kω, 1W

⇒ Resistance of a wire always increases if

temperature is reduced.

temperature is increased.

number of free electrons available become less.

number of free electrons available become more.

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

obms/°C

mhos/ohm°C

ohms/ohm°C

mhos/°C

⇒ 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.

⇒ 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.

⇒ Which of the following materials possesses the least specific resistance?

Aluminium.

Copper.

Silver.

Iron.

⇒ With rise in temperature the resistance of pure metals

increases

decreases

first increases and then decreases

remains constant

⇒ 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

⇒ The specific resistance of all metals is most affected by

Temperature

Pressure

Degree of illumination

Applied magnetic field

⇒ If the length of a wire of resistance R is uniformly stretched to n times its original value, its new resistance is

n R

R/n

n

^{2}R

R/n

^{2}

⇒ Two copper conductors have equal length. The cross-sectional area of one conductor is four times that of the other. If the conductor having smaller cross-sectional area has a resistance of 40 ohms the resistance of other conductor will be

160 ohms

80 ohms

20 ohms

10 ohms

⇒ 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

⇒ Two resistors R1 and R2 give combined resistance of 4.5 ω when in series and 1 ω when in parallel, the resistances are

2 ω and 2.5 ω

1 ω and 3.5 ω

1.5 ω and 3 ω

4 ω and 0.5 ω