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WorksheetsClass 10 Physics - Electricity
Total questions: 50
Worksheet time: 33mins
WHICH DEVICE IS USED FOR MEASURING SMALL CURRENT ?
VOLTMETER
DOUBLE AMMETER {SPECIFIC}
GALVANOMETER
AMMETER
The equivalent resistance of the series combination of two equal resistances is S. When they are joined in parallel, the total resistance is “P”. If S = nP, what is the value of “n”?
2
1
4
3
6
According to ohms law,
The resistance increases with the increases in current.
The resistance increases with the increases in voltage.
The resistance and current both increases wiTh the increases in voltage.
The current increases with the increases in voltage.
kilowatt hour is unit of
energy
power
momentum
force
SI unit of resistivity (specific resistance) is ----------
ohm
ohm meter
volt
ampere
SI unit of resistance is ------------
ohm
volt
ampere
coulomb
An electric bulb is rated 220 V and 100 W. When it is operated on 110 V, power consumed will be ---------------.
100 W
75 W
50 W
25 W
What is the direction of conventional current?
positive terminal to negative terminal
negative terminal to positive terminal
depends on the condition
none
Ohm's law is applicable only when ----------------
temperature remains constant
temperature increases
temperature decreases
Independent of temperature
Keeping the potential difference constant, the resistance of the circuit is halved, the current will become --------------
four times
half
double
one-third
What is the SI unit of electric charge?
ampere
volt
ohm
coulomb
What is the maximum resistance which can be made using five resistor each of 1/5 ohm?
1/5 ohm
10 ohm
5 ohm
1 ohm
What is the minimum resistance which can be made using five resistors each of 1/5 ohm?
1/5 ohm
1/25 ohm
1/10 ohm
1/25 ohm
When a 4 ohm resistor is connected across the terminals of a 2 V battery, the number of coulombs passing through the resistor per second is --------------
0.5
1
2
4
If the current flowing through a fixed resistor is halved, the heat produced in it will become -----------------
one-fourth
one-half
double
four times
The work done to bring unit positive charge from infinity to a point in an electric field is known as ----------
potential
resistance
current
charge
An electric iron of resistance 20 ohm takes a current of 5 A. Calculate the heat developed in 30 s.
1000 joules
2000 joules
15000 joules
30000 joules
An electric iron has a rating of 750 W, 220 V. Calculate current passing through it.
5 A
6 A
3.4 A
7 A
Calculate resistance of an electric bulb which allows a 10 A current when connected to 220 V power source.
10 ohm
12 ohm
22 ohm
32 ohm
When a 12 V battery is connected across an unknown resistor, there is a current 2.5 mA in the circuit. Find the value of resistance of the resistor.
1000 ohm
2000 ohm
4800 ohm
6700 ohm
total current
and the voltage through resistor 3.
What will happen if one light bulb is removed from this circuit?
The other bulbs will go out.
The other bulbs will stay on
The other bulbs will get dimmer.
The battery will become stronger.
What is a circuit with several paths for electricity to flow?
conductor
series circuit
parallel circuit
open circuit
Which type of circuit consumes more energy?
Series
Parallel
Which of the following copper wire has the lowest resistance?
1 metre of 1 mm diameter wire
0.5 metre of 1 mm diameter wire
0.5 metre of 0.5 mm diameter wire
1 metere of 0.5 mm diameter wire
The length of a certain conductor of resistance 100 ohm is doubled and its cross-sectional area is halved. Its new resistance is
100
50
200
400
Factor which does not affect the resistance is__________
Type of material
Length of material
Mass of the material
Area of the material
Two resistors R1 and R2 are made of wires of the same material. The wire used for R1 has half the diameter and is twice as long as the wire used for R2.
What is the value of the ratio resistance of R1 / resistance of R2?
8
4
1
0.5
Graph shows that _____________
Resistance is directly proportional to Area
Resistance is inversely proportional to Area
Resistance is a constant while Area changes.
Area is a constant while resistance changes.
Which component has the highest resistance?
1
2
Where would you place an ammeter in the circuit?
Green ?
Red ?
Where would you place a voltmeter in the circuit?
Green ?
Red ?
What is the unit of measurement for resistance?
Voltage
Ampere
Watts
Ohms
Based on the graph, which of the following would be true regarding the relationship of voltage and current?
As voltage increases, current decreases.
Voltage will not affect current.
As voltage decreases, current increases.
As voltage increases, current also increases.
The current flowing through a wire for various voltages are plotted in the graph. What is the resistance of the wire?
10 ohms
15 ohms
.075 ohms
13.3 ohms
Electric potential difference is measured in:
V
C
F
N/C
V or J/C
Which is the unit of measurement for power?
Ampere
Ohm
Volt
Watt
A family has a record of 09877 for the previous electric bill, and the current billing reads 09897 for the consumption in one month. Which is the total electric consumption of the family?
18 kWh
19 kWh
20 kWh
21 kWh
An air-con, rated 1.8 kW 240 V, is switched on for 10 minutes. Calculate the energy used.
1 080 000 J
144 000 J
2400 J
18 J
A television rated 1.2 kW , 240 V is connected to a 240V electricity supply. Calculate curent that flows through the television.
5 A
2.5 A
0.005
1.0 A
An electric heater is rated 230V, 10 A. Calculate the power of the electric heater in kW.
2300
23
2.3
0.23
