WorksheetsELECTRICITY
Total questions: 20
Worksheet time: 15mins
A wire of length /, made of material resistivity ρ is cut into two equal parts. The resistivity of the two parts are equal to-
ρ
ρ2
2 ρ
4 ρ
The temperature of a conductor is increased. The graph best showing the variation of its resistance is-
A battery of 10 volt carries 20,000 C of charge through a resistance of 20 Ω. The work done in 10 seconds is-
2 × 103 joule
2 × 105joule
2 × 104 joule
2 × 102 joule
A boy records that 4000 joule of work is required to transfer 10 coulomb of charge between two points of a resistor of 50 Ω. The current passing through it is-
2 A
4 A
8 A
16 A
What will be The resistance whose V-I graph is given above..
To get 2 Ω resistance using only 6 Ω resistors, the number of them required is-
2
3
4
6
Two wires of same length and area made of two materials of resistivity ρ1 and ρ2 are connected in series to a source of potential V. The equivalent resistivity for the same area is-
Two devices are connected between two points say A and B in parallel. The physical quantity that will remain the same between the two points is-
current
voltage
resistance
None of these
The least resistance obtained by using 2 Ω, 4 Ω, 1 Ω and 100 Ω is
< 100 Ω
< 4 Ω
< 1 Ω
> 2 Ω
Two wires of same length and area, made of two materials of resistivity ρ1 and ρ2 are connected in parallel V to a source of potential. The equivalent resistivity for the same length and area is-
Calculate the current flows through the 10 Ω resistor in the given circuit.
1.2 A
0.6 A
0.2 A
2.0 A
Two resistors are connected in series gives an equivalent resistance of 10 Ω. When connected in parallel, gives 2.4 Ω. Then the individual resistance are-
each of 5 Ω
6 Ω and 4 Ω
7 Ω and 4 Ω
8 Ω and 2 Ω
If R1 and R2 be the resistance of the filament of 40 W and 60 W respectively operating 220 V, then..
R1 < R2
R2 < R1
R1 = R2
R1 ≥ R2
The resistance of hot filament of the bulb is about 10 times the cold resistance. What will be the resistance of 100 W-220 V lamp, when not in use?
48 Ω
400 Ω
484 Ω
48.4 Ω
If P and V are the power and potential of device, the power consumed with a supply potential V1 is-
A coil in the heater consume power P on passing current. If it is cut into halves and joined in parallel, it will consume power-
P
P2
2P
4P
A fuse wire repeatedly gets burnt when used with a good heater. It is advised to use a fuse wire of-
more length
less radius
less length
more radius
A cooler of 1500 W, 200 volt and a fan of 500 W, 200 volt are to be used from a household supply. The rating of fuse to be used is-
2.5 A
5.0 A
7.5 A
10 A
The effective resistance between A and B is.
4Ω
6Ω
May be 10 Ω
Must be 10 Ω
A cell, a resistor, a key, and an ammeter are arranged as shown in the circuit diagrams. The current recorded in the ammeter will be.
maximum in (i)
maximum in (ii)
maximum in (iii)
same in all the cases
