Question 1 :
A current of 1 A is drawn by a filament of an electric bulb. Number of electrons passing through a cross section of the filament in 16 seconds would be roughly
Question 2 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3d273b230584979bc8.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 total current in the cicruit.
Question 3 :
State whether the statement is TRUE or FALSE : Parallel arrangement is used in domestic wiring because it provides the same potential difference across each electrical appliance.
Question 5 :
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 6 :
A battery of 9 V is connected in series with resistors of 0.2 Ω, 0.3 Ω, 0.4 Ω , 0.5 Ω and 12 Ω, respectively. How much current would flow through the 12 Ω resistor?
Question 7 :
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 8 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d35273b230584979bbf.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 10 :
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
Question 11 :
How much work is done in moving a charge of 2 C across two points having a potential difference 12 V?
Question 12 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d33273b230584979bbd.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 13 :
How much energy is given to each coulomb of charge passing through a 6 V battery?
Question 14 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2f273b230584979bb8.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 16 : <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 17 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d38273b230584979bc3.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 potential difference across the electric lamp.
Question 18 :
What is the lowest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
Question 19 :
An electric lamp of 100 Ω, a toaster of resistance 50 Ω, and a water filter of resistance 500 Ω 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 20 :
An electric iron consumes energy at a rate of 840 W when heating is at the maximum rate and the voltage is 220 V. What is the resistance when heating is at maximum rate?
Question 21 :
What is the equivalent resistance when $10^6\Omega$ , $1\Omega$ and $10^3\Omega$ are connected in parallel?
Question 22 :
When a 12 V battery is connected across a unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of resistance.
Question 23 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2e273b230584979bb6.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 24 :
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
Question 25 :
A hot plate of an electric oven connected to a 220 V line has two resistance coils A and B, each of 24 Ω resistance, which may be used separately, in series, or in parallel. What is the current when only one resistance coil is used?
Question 26 :
State true or false: Series arrangement is used for domestic circuits.
Question 27 :
What is the equivalent resistance when 1Ω ,10$^{6}$Ω and $10^{3}$Ω are connected in parallel?
Question 28 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.
Question 29 : <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 30 :
An electric kettle consumes 1 kW of electric power when operated at 220 V . A fuse wire of what rating must be used for it ?
Question 31 :
A battery of 9 V is connected in series with resistors of 0.2 ohm, 0.3 ohm, 0.4 ohm, 0.5 ohm and 12 ohm, respectively. Find total resistance.
Question 32 :
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 readings in voltmeter?
Question 33 :
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 34 :
What determines the rate at which energy is delivered by a current?
Question 35 :
What is the highest total resistance that can be secured by combinations of four coils of resistance 4 Ω, 8 Ω, 12 Ω, 24 Ω?
Question 36 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d33273b230584979bbc.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 37 :
An electric motor takes 5 A from a 220 V line. Determine the power of the motor.
Question 38 :
How many 176 ohm resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 40 :
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 41 :
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 43 :
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 44 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19c79273b230584979ae6.jpg' />
In the above image, electrical resistivity of some substances at 20° C is given. Which material is the best conductor?
Question 45 :
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 46 :
A piece of wire of resistance R is cut into five equal parts. These parts are connected in parallel. If equivalent resistance of this combination is R', then find the ratio R/R' is
Question 47 :
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 48 : <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 49 :
Which among iron and mercury is a better conductor? If resistivity of iron is $10.0 × 10^{–8}$ Ω m and resistivity of mercury is $94.0 × 10^{–8}$ Ω m.
Question 50 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3a273b230584979bc5.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 $R_{1}$.
