Question Text
Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d74273b230584979c08.PNG' />
In the above image, Which material is the best conductor?
Question 2 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, What will be the power consumed?
Question 3 :
An electric iron of resistance 20 Ω takes a current of 5 A. How much heat is developed in 30 s?
Question 4 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 $\Omega$ resistance. What is the current when they are used in parallel?
Question 5 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.
Question 6 :
What is the equivalent resistance when $10^6\Omega$ and $1\Omega$ are connected in parallel?
Question 7 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d73273b230584979c07.PNG' />
In the above image, Which among iron and mercury is a better conductor?
Question 8 :
State true or false: Series arrangement is used for domestic circuits.
Question 9 :
How many number of electrons constitute 1 coulomb of charge ?
Question 10 :
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. What is the value of the resistance of the resistor?