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The Substance Having Infinitely High Electrical Resistance is Called: (A) Conductor (B) Resistor (C) Superconductor (D) Insulator - Science

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प्रश्न

The substance having infinitely high electrical resistance is called:

(a) conductor
(b) resistor
(c) superconductor
(d) insulator

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उत्तर

(d) insulator
A substance having infinitely high electrical resistance is called an insulator.

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  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 1: Electricity - Exercise 3

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संबंधित प्रश्‍न

In series combination which remains constant?
(a) Voltage
(b) Current
(c) Both current and voltage
(d) Both are variables


The V-I graph for a series combination and for a parallel combination of two resistors is shown in the figure below. Which of the two A or B. represents the parallel combination? Give reasons for your answer.


(i) Two sets A and B, of three bulbs each, are glowing in two separate rooms. When one of the bulbs in set A is fused, the other two bulbs also cease to glow. But in set B, when one bulb fuses, the other two bulbs continue to glow. Explain why this phenomenon occurs.

(ii) Why do we prefer arrangements of Set B for house circuiting?


When a 4 Ω resistor is connected across the terminals of a 12 V battery, the number of coulombs passing through the resistor per second is:

(a) 0.3
(b) 3
(c) 4
(d) 12


If the length of a wire is doubled by taking more of wire, what happens to its resistance?


The diagram below shows part of a circuit: 

 

If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
 
(a) 9 Ω
(b) 4 Ω
(c) 6 Ω
(d) 18 Ω


What is electrical resistance? Write its SI unit.

What is the value of a resistance if 20 V drives 2 A through it?

What do you mean by power rating of an electrical appliance? How do you use it to calculate 

(a) the resistance of the appliance and

(b) the safe limit of the current in it, while in use?


Answer the following question.
While studying the dependence of potential difference ( V) across a resistor on the current (I) passing through it, in order to determine the resistance of the resistor, a student took 5 readings for different values of current and plotted a graph between V and t. He got a straight line graph passing through the origin. What does the straight-line signify? Write the method of determining the resistance of the resister using this graph. 


What material is used for making wire to prepare heating coils? Give a reason.


State the effect of rise in temperature on the resistance of semi-conductors.


How does the resistivity of an alloy such as constantace depends on temperature.


Write an expression for calculating electrical power in terms of current and resistance.


State a relation between electrical power, resistance and potential difference in an electrical circuit.


Calculate the equivalent resistance between the points A and B for the following combination of resistors:


Four resistances of 2.0Ω each are joined end to end, to form a square ABCD. Calculate the equivalent resistance of the combination between any two adjacent comers.


In the circuit shown below, calculate the equivalent resistance between the points (i) A and B, (ii) C and D.


Two wires of same material and same lengths have radii in the ratio of 2 : 3, Compare their resistances.


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