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WorksheetsTCE F5 Mock (2022) - Electricity
Total questions: 64
Worksheet time: 16hrs 0mins
An electric kettle is commonly used to heat up water at home. The heating element used is nichrome wire and not copper. Which of the following reasons best explains why nichrome is used instead of copper?
Nichrome conducts more current than copper, so more heat can be generated.
Nichrome has higher resistance than copper, so more heat can be generated.
Nichrome has higher voltage than copper, so more heat can be generated.
Nichrome are cheaper than copper, so it is more economical.
The parts of the national grid for generation and transmission of electrical power are
NGC natural gas pipeline - furnace-boiler - turbine-generator-
furnace-boiler - generator-turbine- NCG natural gas pipeline
NGC natural gas pipeline - Power station - step up transformer - Grid - consumers
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 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
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
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
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
What is the formula for power?
P = E⁄t
P = t⁄E
P = E⁄2t
P = 2E⁄t
What is power?
The number of repetitions of squats a body-builder can perform
The number of cylinders in a car
The rate at which energy is absorbed
The rate at which energy is transferred
Power, potential difference and current are correctly related by which equation?
P = I x V
P = 2I x V
P = I⁄V
P = I⁄2V
This is the symbol for a...
Light Emitting Diode
Fuse
Fixed Resistor
Variable Resistor
Assertion: Conductors allow the current to flow through themselves.
Reason: They have free charge carriers.
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
(a) Both the Assertion and the Reason are correct and the Reason is the correct explanation of the Assertion.
(b) The Assertion and the Reason are correct but the Reason is not the correct explanation of the Assertion.
(c) Assertion is true but the Reason is false.
(d) The statement of the Assertion is false but the Reason is true.
According to Ohm's Law, the potential difference across the ends of a resistor is directly proportional to the ……… through it, provided its ............ remains constant.
current, temperature
temperature, current
physical condition, temperature
physical condition, current
When electric current is passed, electrons move from:
high potential to low potential.
low potential to high potential.
in the direction of the current.
against the direction of the current.
What is the frequency of the mains electricity supply? (do not worry about the units here)
(a)
What does the graph on the left show?
direct current
alternating current
Imagine the symbols are numbered 1,2,3,4 from left to right.
What is number 3 the symbol for?
A variable resistor
A fuse
A lamp
A fixed resistor
A student used some everyday items to investigate static electricity.
Figure 1 shows a flexible plastic strip being rubbed with a cloth.
Complete the sentence (with 1 correct word).
Rubbing the plastic strip with the cloth causes the strip to become negatively charged because (a) move from the cloth onto the plastic strip.
Figure 1 shows a flexible plastic strip being rubbed with a cloth.
Rubbing the plastic strip with the cloth causes the strip to become negatively charged.
Complete the sentence with 1 correct term.
The cloth is left with a (a) charge.
A lamp is connected to a 24 V power supply. The current through the lamp is 1.5 A.
Calculate the power of the lamp. (Answer to 2 Sig Fig with unit symbol).
(a)
The diagram shows a temperature sensing circuit used to control a heating system in a house.
The current in the circuit is 3.5 mA when the potential difference across the thermistor is 4.2 V
Calculate the resistance of the thermistor in Ohms (Answer to 2 sig fig, no units needed)
(a)
The diagram shows a temperature sensing circuit used to control a heating system in a house.
Calculate the charge that flows through the thermistor in 5 minutes when the current is 3.5 mA. (answer to 3 sig fig, no units needed)
(a)
Figure 1 shows the inside of a battery pack designed to hold three identical 1.5 V cells.
Which one of the arrangements shown in Figure 2 would give a 4.5 V output across the battery pack terminals T?
The battery in the drone can store 97.5 kJ of energy.
When the drone is hovering, the power output of the battery is 65.0 W
Calculate the time in seconds for which the drone can hover. (2 sig fig answer with no units).
(a)
A student set up the electrical circuit shown in the figure.
The ammeter displays a reading of 0.10 A.
Calculate the resistance of the resistor labelled R in Ohms. (2 sig fig, no units needed).
(a)
A student set up the electrical circuit shown in the figure.
What line best describes what happens to the total resistance of the circuit and the current through the circuit when switch S is closed.
Total resistance decreases, so current decreases
Total resistance decreases, so current increases
Total resistance decreases, so voltage decreases.
Total resistance increases, so current decreases.
Total resistance increases, so current increases.
The diagram shows the circuit used to obtain the data needed to plot the current-potential difference graph for a filament lamp.
Why is component M included in the circuit?
To keep the current constant.
To keep the potential difference constant.
To vary the current.
To vary the bulbs resistance.
The diagram shows the circuit used to obtain the data needed to plot the current-potential difference graph for a filament lamp.
Why does the resistance of the lamp increase as the potential difference across the lamp increases?
It varies with voltage.
Because resistance is linked to voltage and current.
Because there is more current.
The temperature of the filament increases
A cell, a resistor, a key and ammeter are arranged as shown in the circuit diagrams of Figure (i), (ii) and (iii). The current recorded in the ammeter will be
maximum in (i)
maximum in (ii)
maximum in (iii)
will be same in all the cases
A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 R2 and R3 respectively. Which of the following is high ?
R1 = R2 = R3
R1 > R2 > R3
R3 > R2 > R1
none of these
1-A, 2-C, 3-B, 4-D
1-D, 2-A, 3-C, 4-B
1-C, 2-B, 3-D, 4-A
1-B, 2-D, 3-A, 4-C
The picture shows a balloon and a portion of a wall with a neutral charge.
If a student rubs the balloon against his or her hair, giving the balloon a negative charge, which image correctly shows the how the charges in the balloon and wall will be arranged?
Given below are two statements:
Statement 1: A 2-input OR gate and a 2-input AND gate have similar inputs, but both outputs may be the same or different
Statement 2: An AND gate has inputs A and B. The input B is always low, the state of input A can affect the output
Choose the correct answer from the options below.
Both statements 1 and 2 are true
Both statements 1 and 2 are false
Statement 1 is true but statement 2 is false
Statement 1 is false but statement 2 is true
For a 3-input NOR gate, the possible number of states where output is 0, is ____
8
1
7
5
If a signal passing through a logic gate is inhibited by sending a LOW into 1 of its inputs, and the output is high, the gate is a/an ______
AND
NAND
NOR
OR
The format used to present the logic output for the various combinations of logic inputs to a gate is called a/an ______
input logic function
Boolean algebra
truth table
Boolean variable
If the input of a NOT gate is A, and the output is X, then ______
X = A
X = Ā
X = 0
How many input combinations would a truth table have for a six-input AND gate?
32
48
64
128
With regard to an AND gate, which statement is true?
An AND gate has two inputs and one output
An AND gate has two or more inputs and two outputs
If one input to a 2-input AND gate is high, the output reflects the other input
A two-input AND gate has eight input possibilities
NOR and AND
NOR and OR
OR and NOR
NOT and OR
1
2
3
4
1
2
3
4
A and B
B and C
A and C
A, B and C
The wire maintained at zero potential by connecting it to earth at the power station itself is called
earth/ground wire
neutral wire
live wire
delta wire
The potential difference between the live wire and the neutral wire is ____
180 V
110 V
220 V
320 V
An electric kettle has two heating coils. When one of the coils is connected to an alternating current source, the water in the kettle boils in 10 minutes. When the other coil is used, the same quantity of water 15 minutes to boil. How long it will take for the same quantity of water to boil, if the two coils are connected in parallel?
6 minutes
12 minutes
18 minutes
24 minutes
Which one/ones of the following statements is INCORRECT for alternating current?
It can be transmitted over long distances
Its production is cheaper
Its voltage can be easily changed
The loss of power during transmission of alternating current is more when compared to direct current
The conversion of alternating current to direct current is hard
If the transformer ratio is in the order of 1:16, what will the ratio of the primary and secondary currents?
4:1
1:16
16:1
1:4
If 25 W of power are applied to the primary of an ideal transformer with a turns ratio of 10, the power delivered to the secondary load is
25 W
0 W
250 W
2.5 W
At main sub-station, the voltage is stepped _____ from ______ to _____
down, 132kV, 33 kV
down 33 kV, 11kV
up, 110 V, 132kV
down, 33 kV, 11kV
up, 220 V, 11 kV
State the colour-coding of wires in the flexible lead used for connecting the appliances to the mains in house wiring
(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
