Question 1 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cda273b230584979b56.JPG ' />
In the above electric circuit, there is no difference in the reading of ammeters $A_1$ and $A_2$. Is it TRUE or FALSE ?
Question 2 :
A cylindrical conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross section
Question 3 :
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 4 :
Which of the following terms does not represent electrical power in a circuit?
Question 5 :
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 resistance of an electric iron connected to the same source that takes as much current as all three appliances?
Question 7 :
A current of 0.5 A is drawn by a filament of an electric bulb for 10 minutes. Find the amount of electric charge that flows through the circuit?
Question 8 :
An electric lamp of 100 ohm, a toaster of 50 ohm and a water filter of resistance 500 ohm 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 the three appliances?
Question 10 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d31273b230584979bba.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 11 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c7a273b230584979ae7.jpg' />
In the above image, electrical resistivity of some substances at 20° C is given. Which among iron and mercury is a better conductor?
Question 12 :
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R’, then what is the ratio $\frac{R}{R^{'}}$?
Question 13 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 14 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3e273b230584979bca.jpg' /> In the above diagram, $R_{1}$= 10 Ω, $R_{2}$= 40 Ω, $R_{3}$ = 30 Ω, $R_{4}$= 20 Ω,$R_{5}$ = 60 Ω, and a 12 V battery is connected to the arrangement. Calculate the total resistance in the circuit.
Question 17 :
Which device is used to change the resistance in the circuit?
Question 18 :
In a schematic diagram of a circuit consisting of a battery of three cells of 2 V each, a 5 ohm resistor, a 8 ohm resistor and a 12 ohm resistor and a plug key, all connected in series and put an ammeter to measure the current through the resistors and a voltmeter to measure the potential difference across 12 ohm resistor. What will be the equivalent resistance?
Question 19 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d41273b230584979bcd.jpg' /> In the above image,the values of current I flowing in a given resistor for the corresponding values of potential difference V across the resistor are given. Find the mean resistance.
Question 20 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d37273b230584979bc1.jpg' /> In the above figure, an electric lamp, whose resistance is 20 Ω, and a conductor of 4 Ω resistance are connected to a 6 V battery. Calculate the total resistance of the circuit.
Question 22 :
A copper wire has diameter 0.5 mm, resistance 10Ω and resistivity $1.6×10^{-8}Ω$m.How much does the resistance change if the diameter is doubled?
Question 23 :
Which of the following terms does not represent electrical power in a circuit?
Question 24 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d34273b230584979bbe.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 25 :
A copper wire has diameter 0.5 mm and resistivity of $1.6 \times 10^{-8} \Omega m$. What will be the length of this wire to make its resistance 10 $\Omega$?
Question 26 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3c273b230584979bc7.jpg' /> In the above diagram, the resistors $R_{1},R_{2},R_{3}$ have the values 5 Ω, 10 Ω, 30 Ω, respectively, which have been connected to a battery of 12 V. Calculate the current through $R_{3}$ .
Question 27 :
Resistance of a metal wire of length 1 m is 26 Ω at 20°C. If the diameter of the wire is 0.3 mm, what will be the resistivity of the metal at that temperature?
Question 29 :
An electric iron of resistance 20 ohm takes a current 5 A. Calculate the heat developed in 30 s.
Question 30 :
In an electrical circuit three incandescent bulbs A, B and C of rating 40 W, 60 W and 100 W respectively are connected in parallel to an electric source . Which of the following is likely to happen regarding their brightness ?
Question 31 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cd7273b230584979b52.JPG ' />
In the above electric circuit, find out the effective resistance of two $8\Omega$ resistors in the combination
Question 32 :
An electric heater of resistance 8 Ω draws 15 A from the service mains 2 hours. Calculate the rate at which heat is developed in the heater.
Question 33 :
State true or false: Series arrangement is used for domestic circuits.
Question 34 :
<img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cd9273b230584979b54.JPG ' />
In the above electric circuit, find out the potential difference across $4\Omega$ resistance .
Question 35 :
How is voltmeter connected in circuit to measure the potential difference between the two points?