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Q1. | In an ordinary heater if the length of the coil is halved, then a given quantity of water will boil |

A. | Less time [Correct Answer] |

B. | More time [Wrong Answer] |

C. | Same time [Wrong Answer] |

D. | None of these [Wrong Answer] |

View Answer
Explanation:-
Answer : ADiscuss it below :Bishal shrestha Said on 2021-02-28 21:45:02
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**Also Read Similar Questions Below :**

⇒ When the temperature of metallic conductor is increased, its resistance

Always decreases

Always increases

May increase or decrease

Remains the same

⇒ 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 straight conductor does not depend upon its

Shape of cross-section

Temperature

Material

Length

⇒ With rise in temperature the resistance of pure metals

increases

decreases

first increases and then decreases

remains constant

⇒ Which of tite following materials has the least resistivity?

Zinc

Lead

Mercury

Copper

⇒ Specific resistance of a conductor depends upon

dimensions of the conductor.

composition of conductor material.

resistance of the conductor

both (a) and (b).

⇒ 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

⇒ With rise in temperature the resistance of semi-conductors

decreases

increases

first increases and then decreases

remains constant

⇒ 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.

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

obms/°C

mhos/ohm°C

ohms/ohm°C

mhos/°C

⇒ 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

⇒ 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 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

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

reactance

capacitance

impedance

resistance

⇒ 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

⇒ A thermistor has

positive temperature coefficient

negative temperature coefficient

zero temperature coefficient

variable temperature coefficient

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

Aluminium.

Copper.

Silver.

Iron.

⇒ Conductance is reciprocal of

resistance

inductance

reluctance

capacitance

⇒ 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}

⇒ The temperature-coefficient of resistance of conductors is

Positive

Negative

Neutral

First A then C

⇒ 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

⇒ 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

⇒ 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 specific resistance of a wire depends upon

Its length

Its cross-sectional area

Its dimensions

Its material

⇒ 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

⇒ Varistors are

insulators

non-linear resistors

carbon resistors

resistors with zero temperature coefficient

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

Carbon

Germanium

Electrolyte

Aluminium

⇒ 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.

⇒ 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.

⇒ 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.