Question 1 :
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), the increase in power dissipated will be
Question 2 :
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 3 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d2e273b230584979bb7.PNG' />
Above image is the symbol of ______ in circuit diagram.
Question 4 :
How much heat is generated while transferring 96000 coulomb of charge in one hour through a potential difference of 50 V?
Question 5 :
In series combination of resistors, the current is _____in every part of
the circuit.
Question 6 :
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 7 :
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 9 :
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 10 :
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 11 : <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 12 :
When a 12 V battery is connected across an unknown resistor, there is a current of 2.5 mA in the circuit. Find the value of the resistance of the resistor.
Question 13 :
What determines the rate at which energy is delivered by a current?
Question 15 :
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 17 :
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 18 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d3d273b230584979bc9.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 circuit resistance.
Question 19 :
In an electrical circuit two resistors of $2\Omega \ and \ 4\Omega$ respectively are connected in series to a 6 V battery. The heat dissipated by the $4\Omega$ resistor in 5 s will be
Question 20 :
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 current through the electric iron if it is connected to the same source that and takes as much current as all three appliances?
Question 21 :
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Question 22 :
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 ammeter?
Question 23 : <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 25 :
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 27 :
An electric refrigerator rated 400 W operates 8 hour/day. What is the cost of the energy to operate it for 30 days at Rs 3.00 per kW h?
Question 28 :
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 the ratio $\frac{R}{R'}$ is?
Question 30 : <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 31 :
Two conducting wires of 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, the ratio of heat produced in series and parallel combinations would be
Question 32 :
How much energy is given to each coulomb of charge passing through a 6 V battery?
Question 33 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
Question 34 :
What are the factors resistance of conductor does not depend upon?
Question 36 :
An electric iron consumes energy at a rate of 360 W when the heating is at the minimum and the voltage is 220 V. What is the resistance when heating is at minimum rate?
Question 37 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 38 :
Compute the heat generated while transferring 96000 C of charge in one hour through a potential difference of 50V?
Question 39 :
What is the maximum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$ ?
Question 40 :
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 will be the ratio of heat produced in series and parallel combinations?
Question 41 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cda273b230584979b55.JPG ' />
In the above electric circuit, find out the power dissipated in $4\Omega$ resistor .
Question 42 :
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 43 :
How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 44 :
State true or false: Series arrangement is used for domestic circuits.
Question 45 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, What will be the power consumed?
Question 46 : <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 47 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19cdc273b230584979b58.JPG ' />
In the above circuits , heat produced in the resistor or combination of resistors connected to a 12 V battery will be
Question 48 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d38273b230584979bc2.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 current through the circuit.
Question 49 :
Will current flow more easily through a thick wire or a thin wire of the same material, when connected to the same source?
