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WorksheetsH Physics - Unit 2 Electricity Complete
Total questions: 40
Worksheet time: 1hrs 20mins
The output from a signal generator is connected to the input terminals of an oscilloscope. The trace observed on the oscilloscope screen, the Y-gain setting and the timebase setting are shown.
The frequency of the signal shown is calculated using the
timebase setting and the vertical height of the trace
timebase setting and the horizontal distance between the peaks of the trace
Y-gain setting and the vertical height of the trace
Y-gain setting and the horizontal distance between the peaks of the trace
Y-gain setting and the timebase setting
A circuit is set up as shown.
The r.m.s voltage across the lamp is 12 V.
The power produced by the lamp is 24 W.
The peak current in the lamp is
0·71 A
1·4 A
2·0 A
2·8 A
17 A
A
B
C
D
E
The rms voltage of the mains supply is 230 V.
The approximate value of the peak voltage is
115 V
163 V
325 V
460 V
651 V
An oscilloscope is connected to the output terminals of a signal generator.
The trace displayed on the screen is shown.
The timebase of the oscilloscope is set at 30 ms/div.
The frequency of the output signal from the signal generator is
4·2 × 10−3 Hz
8·3 × 10−3 Hz
0·12 Hz
4·2 Hz
8·3 Hz
The output from an AC power supply is connected to an oscilloscope.
The trace seen on the oscilloscope screen is shown.
The Y-gain setting on the oscilloscope is 1·0 V/div.
The rms voltage of the power supply is
2·1 V
3·0 V
4·0 V
4·2 V
6·0 V
The output from a signal generator is connected to an oscilloscope. The trace observed on the oscilloscope screen is as shown in the diagram.
The frequency of the signal from the signal generator is now doubled.
The amplitude of the signal is unchanged.
The Y-gain setting on the oscilloscope is unchanged.
The timebase setting on the oscilloscope is changed from 1·0 ms/division to 0∙5 ms/division.
Which of the following diagrams shows the trace that is now observed on the oscilloscope screen?
The heating element of an electric kettle has a resistance of 30 Ω.
The kettle is connected to an a.c. power supply.
The r.m.s. voltage of the supply is 230 V.
The peak value of the current in the element is
0·1 A
0·2 A
5·4 A
7·7 A
10·8 A
The output of a 50 Hz a.c. supply is connected to the input of an oscilloscope. The trace produced on the screen of the oscilloscope is shown.
The time-base control of the oscilloscope is set at
1 ms/div
10 ms/div
20 ms/div
100 ms/div
200 ms/div
An oscilloscope is connected to the output terminals of a signal generator. The trace displayed on the screen is shown.
The timebase of the oscilloscope is set at 30 ms/div.
The frequency of the output signal from the signal generator is
4·2 × 10−3 Hz
8·3 × 10−3 Hz
0·28 Hz
4·2 Hz
8·3 Hz
A circuit is set up as shown.
The r.m.s voltage across the lamp is 12 V.
The power produced by the lamp is 24 W.
The peak current in the lamp is
0·71 A
1·4 A
2·0 A
2·8 A
17 A
increases
decreases
remains constant
decreases and then increases
increases and then decreases
A circuit is set up as shown.
The battery has negligible internal resistance.
A student makes the following statements about the readings on the meters in this circuit.
I When switch S is open the reading on the voltmeter will be 6·0 V.
II When switch S is open the reading on A2 will be 0·60 A.
III When switch S is closed the reading on A1 will be 0·80 A.
Which of these statements is/are correct?
I only
II only
I and II only
II and III only
I, II and III
The power dissipated in a 120Ω resistor is 4·8 W.
The current in the resistor is
0·020 A
0·040 A
0·20 A
5·0 A
25 A
In the diagrams below, each resistor has the same resistance.
Which combination has the least value of the effective resistance between the terminals X and Y?
Four resistors each of resistance 20Ω are connected to a 60 V supply of negligible internal resistance as shown.
The potential difference across PQ is
12 V
15 V
20 V
24 V
30 V
A circuit is set up as shown.
The power supply has negligible internal resistance.
The power dissipated in the 3∙0 Ω resistor is
3∙0 W
6∙0 W
9∙0 W
12 W
18 W
The diagram shows part of an electrical circuit.
What is the resistance between X and Y?
0·2 Ω
5 Ω
10 Ω
20 Ω
50 Ω
One volt is equivalent to one
farad per coulomb
ampere per ohm
joule per ampere
joule per ohm
joule per coulomb
A battery of e.m.f. 24 V and negligible internal resistance is connected as shown.
The reading on the ammeter is 2. 0 A.
The resistance of R is
3.0 Ω
4.0 Ω
10 Ω
12 Ω
18 Ω
A 20 μF capacitor is connected to a 12 V d.c. supply.
The maximum charge stored on the capacitor is
1·4 × 10−3 C
2·4 × 10−4 C
1·2 × 10−4 C
1·7 × 10−6 C
6·0 × 10−7 C
A circuit containing a capacitor is set up as shown.
The supply has negligible internal resistance.
The maximum energy stored in the capacitor is
5·4 × 10−4 J
3·5 × 10−4 J
1·4 × 10−4 J
3·4 × 10−5 J
2·2 × 10−5 J
A 24·0 μF capacitor is charged until the potential difference across it is 125 V.
The charge stored on the capacitor is
5·21 × 106 C
7·75 × 10−2 C
1·50 × 10−3 C
3·00 × 10−3 C
1·92 × 10−7 C
A circuit is set up as shown.
When the capacitor is fully charged the energy stored in the capacitor is
1·6 × 10−5 J
1·3 × 10−3 J
2·6 × 10−3 J
1·6 × 10−2 J
1·6 × 104 J
The circuit shown is used to charge and then discharge a capacitor C.
Which pair of graphs shows how the potential difference V across the capacitor varies with time t during charging and discharging?
A
B
C
D
E
The graph shows how the charge, Q, stored on a capacitor varies with the potential difference, V, across the capacitor.
Which of the following statements is/are correct?
I The gradient of the graph represents the capacitance of the capacitor.
II The area under the graph represents the work done in charging the capacitor.
III The energy, E, stored in the capacitor is given by the equation E = QV.
I only
II only
III only
I and II only
I, II and III
The capacitance of a capacitor is 1000 μF. The potential difference (p.d.) across the capacitor is 100 V. The charge stored by the capacitor is 0·10 C.
The charge on the capacitor is now reduced to half its original value.
Which row in the table shows the capacitance of the capacitor and the p.d. across the capacitor, for this new value of charge?
A
B
C
D
E
A student makes the following statements about capacitors.
I Capacitors block a.c. signals.
II Capacitors store energy.
III Capacitors store charge.
Which of these statements is/are true?
I only
I and II only
I and III only
II and III only
I, II and III
A circuit is set up as shown.
The capacitor is initially uncharged. Switch S is now closed. Which graph shows how the potential difference, V, across R, varies with time, t?
A student makes the following statements about energy bands in different materials.
I In metals the highest occupied energy band is not completely full.
II In insulators the highest occupied energy band is full.
III The gap between the valence band and conduction band is smaller in semiconductors than in insulators.
Which of these statements is/are correct?
I only
II only
I and II only
I and III only
I, II and III
A student makes the following statements about conductors, insulators and semiconductors.
I In conductors, the conduction band is completely filled with electrons.
II In insulators, the gap between the valence band and the conduction band is large.
III In semiconductors, increasing the temperature increases the conductivity.
Which of these statements is/are correct?
I only
II only
III only
I and II only
II and III only
A student connects four identical light emitting diodes (LEDs) to a 2 V DC supply as shown.
Which of the LEDs P, Q, R, and S will light?
P only
Q only
P and Q only
P and R only
Q and S only
A student makes the following statements about p-n junction devices.
I In solar cells, a potential difference is produced when photons are incident on the junction.
II The photovoltaic effect occurs in solar cells.
III In LEDs, photons are emitted from the junction when a current is passed through it.
Which of these statements is/are correct?
I only
III only
I and II only
I and III only
I, II and III
The letters X, Y and Z represent missing words in the following passage.
Solids can be categorised as conductors, semiconductors or insulators.
In . . . X . . . the energy gap between the valence band and the conduction band is . . . Y . . . , allowing . . . Z . . . conduction to take place at room temperature.
Which row in the table shows the missing words?
A
B
C
D
E
A crystal of silicon is “doped” with arsenic. This means that a small number of the silicon atoms are replaced with arsenic atoms.
The effect of the doping on the crystal is to
make it into a photodiode
make it into an insulator
increase its resistance
decrease its resistance
allow it to conduct in only one direction
The letters X, Y and Z represent missing words from the following passage.
Solids can be divided into 3 broad categories: conductors, insulators and semiconductors.
In ....X.... the conduction band is not completely full and this allows electrons to move easily.
In ....Y.... the valence band is full.
In ....Z.... electrons can move from the valence to the conduction band at room temperature.
Which row in the table shows the missing words?
A
B
C
D
E
An LED is connected as shown.
When switch S is closed
the p-n junction is reverse biased and free charge carriers are produced which may recombine to give quanta of radiation
the p-n junction is forward biased and positive and negative charge carriers are produced by the action of light
the p-n junction is reverse biased and positive and negative charge carriers are produced by the action of light
the p-n junction is forward biased and positive and negative charge carriers may recombine to give quanta of radiation
the p-n junction is reverse biased and positive and negative charge carriers may recombine to give quanta of radiation
A student writes the following statements about p-type semiconductor material.
I Most charge carriers are positive.
II The p-type material has a positive charge.
III Impurity atoms in the material have 3 outer electrons.
Which of these statements is/are true?
I only
II only
I and II only
I and III only
I, II and III
A p-n junction diode is forward biased.
Positive and negative charge carriers recombine in the junction region. This causes the emission of
a hole
an electron
an electron-hole pair
a proton
a photon
