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25 questions
1
Conductivity
Moderate
+1.0
-0.25
The substance which has a large number of free electrons and offer a low resistance is called :
2
Conductivity
Moderate
+1.0
-0.25
Which elements is the best conductor of electricity?
3
Conductivity
Moderate
+1.0
-0.25
Which one of the following is the best conductor of electricity?
4
Conductivity
Moderate
+1.0
-0.25
Which of the following is the best conductor of electricity?
5
Conductivity
Moderate
+1.0
-0.25
Which of the following liquids is a bad conductor of electricity?
6
Conductivity
Moderate
+1.0
-0.25
Assertion (A): Copper rods are generally preferred to iron rods for making lightning conductors. Reason (R): Copper is better conductor of electricity than iron and is not easily oxidized under atmospheric conditions.
7
Conductivity
Moderate
+1.0
-0.25
Due to temperature variation along a conductor, potential variation occurs along it. This phenomenon is known as :
8
Conductivity
Moderate
+1.0
-0.25
Given below are two statements, in which one is labelled as Assertion (A) and the other as Reason (R). Assertion (A): A person travelling in a car with closed glass windows and doors is safe from the lightening strike. Reason (R): Actually a closed car behaves like a hollow conductor, so charges cannot enter inside the car. Select the correct answer using the code given below-Code:
9
Conductivity
Moderate
+1.0
-0.25
Which of the following diode is used in ultra-high speed switching electronic circuits?
10
Conductivity
Moderate
+1.0
-0.25
The characteristic of superconductor is –