Question 1 : <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 2 :
How much power is used in 2$\Omega$ resistor when a 4 V battery is connected in parallel with 12$\Omega$ and 2$\Omega$ resistors?
Question 3 :
Several electric bulbs designed to be used on a 220 V electric supply line, are rated 10 W. How many lamps can be connected in parallel with each other across the two wires of 220 V line if the maximum allowable current is 5 A?
Question 4 :
How is a voltmeter connected in the circuit to measure the potential difference between two points?
Question 5 :
What is the equivalent resistance when $10^6\Omega$ , $1\Omega$ and $10^3\Omega$ are connected in parallel?
Question 6 :
A battery of 9 V is connected in series with resistors of 0.2 $\Omega$, 0.3 $\Omega$, 0.4 $\Omega$ , 0.5 $\Omega$ and 12 $\Omega$, respectively. How much current would flow through the 12 $\Omega$ resistor?
Question 7 :
Which of the following terms does not represent electrical power in a circuit?
Question 8 :
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 9 :
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 separately?
Question 10 :
What determines the rate at which energy is delivered by a current?
Question 11 :
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?
Question 12 :
Two lamps, one rated 100 W at 220 V, and the other 60 W at 220 V, are connected in parallel to electric mains supply. What current is drawn from the line if the supply voltage is 220 V?
Question 13 :
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. What is the rate at which heat is developed in the heater?
Question 14 :
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Question 15 :
How many number of electrons constitute 1 coulomb of charge ?
Question 16 :
How much power is used in 2$\Omega$ resistor when a 4 V battery is connected in parallel with 12$\Omega$ and 2$\Omega$ resistors?
Question 17 :
An electric lamp of $100\Omega$, a toaster of resistance $50\Omega$, and a water filter of resistance $500\Omega$ are connected in parallel to a 220 V source. What is the current through an electric iron connected to the same source that takes as much current as all three appliances?
Question 18 :
How much heat is generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V?
Question 19 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, What will be the power consumed?
Question 20 :
A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{-8} \Omega m$. How much does the resistance change if the diameter is doubled?
Question 21 : <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 22 :
How much energy is given to each coulomb of charge passing through a 6 Volt battery?
Question 23 :
What is the lowest total resistance that can be secured by combinations of four coils of resistance 4 $\Omega$, 8 $\Omega$, 12 $\Omega$, 24 $\Omega$?
Question 24 :
How many 176 $\Omega$ resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 25 :
How much power is used in 2$\Omega$ resistor when a 6 V battery is connected in series with 1$\Omega$ and 2$\Omega$ resistors?
Question 26 :
An electric motor takes 5 A from a 220 V line. What is the power of the motor?
Question 27 :
Two conducting wires of the same material and of equal lengths and equal diameters are first connected in series and then parallel in a circuit across the same potential
difference. What would be the ratio of heat produced in series and parallel combinations ?
Question 28 :
An electric iron of resistance 20 Ω takes a current of 5 A. How much heat is developed in 30 s?
Question 29 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.
Question 30 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 $\Omega$, 8 $\Omega$, 12 $\Omega$, 24 $\Omega$?
