Question 1 :
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 2 :
How many 176 Ω resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 4 :
How much work is done in moving a charge of 2 C across two points having a potential difference 12 V?
Question 5 :
An electric bulb is rated 220 V and 100 W. What will be the power consumed if it is operated on 110V?
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 readings in voltmeter?
Question 7 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d72273b230584979c06.PNG' />
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. What is the resistance of the resistor?
Question 9 :
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 10 :
State true or false: When connected to the same source the current will flow more easily through a thick wire than thin wire.
Question 11 :
An electric motor takes 5 A from a 220 V line. Determine the power of the motor.
Question 12 :
Two lamps, one rated at 100W-220 V and other 60 W-220 V are connected in parallel to electric mains supply. What current is drawn from the line, if supply voltage is 220 V ?
Question 13 : <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 14 :
Which of the following terms does not represent electrical power in a circuit?
Question 15 : <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 16 :
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 current when heating is at minimum rate?
Question 17 :
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 19 :
What is the equivalent resistance when $10^6\Omega$ , $1\Omega$ and $10^3\Omega$ are connected in parallel?
Question 20 :
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 21 :
What is the name of a device that helps to maintain a potential difference across a conductor?
Question 22 :
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 23 :
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 24 :
How many 176 ohm resistors (in parallel) are required to carry 5 A on a 220 V line?
Question 25 : <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 26 :
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 27 :
Compute the heat generated while transferring 96000 C of charge in one hour through a potential difference of 50V?
Question 28 :
An electric iron of resistance 20 ohm takes a current 5 A. Calculate the heat developed in 30 s.
Question 29 :
A wire of given material having length l and area of cross-section A
has a resistance of 4 Ω. What would be the resistance of another wire
of the same material having length $\frac{l}{2}$ and area of cross-section 2A?
Question 30 :
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 31 :
How is voltmeter connected in circuit to measure the potential difference between the two points?
Question 32 :
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 33 :
A copper wire has diameter 0.5 mm and resistivity of $1.6×10^{-8}Ω$m. What will be the length of this wire to make its resistance 10 Ω?
Question 35 :
What is the equivalent resistance when 1Ω ,10$^{6}$Ω and $10^{3}$Ω are connected in parallel?
Question 36 :
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 37 :
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, the power consumed will be
Question 38 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b19d39273b230584979bc4.jpg' /> In 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 conductor.
Question 39 :
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 40 :
An electric motor takes 5 A from a 220 V line. How much energy is consumed in 2 h.?
Question 42 :
100 J of heat is produced each second in a 4 Ω resistance. Find the potential difference across the resistor.
Question 43 :
How much energy is given to each coulomb of charge passing through a 6 Volt battery?
Question 44 :
Which uses more energy, a 250 W TV set in 1 hr, or a 1200 W toaster in 10 minutes?
Question 45 :
What is the minimum resistance which can be made using five resistors each of $\frac{1}{5}\Omega$ ?
Question 46 :
An electric iron of resistance 20 Ω takes a current of 5 A. Calculate the heat developed in 30 s.
Question 47 :
State whether the statement is TRUE or FALSE : If a current larger than a specified value flows in a circuit,
temperature of fuse wire increases to its melting point. The fuse
wire melts and the circuit breaks to protect electrical appliances.
Question 49 :
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 50 :
Which device is used to change the resistance in the circuit?
