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3.4 - exam questions
Biological science (University of Oxford)
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Colonel Frank Seely School
Exampro A-level Physics Name:
(7407/7408) Class:
3.4.1.7 Work, energy and power
Author:
Date:
Time: 626
Marks: 529
Comments
:
Page 1
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Colonel Frank Seely School
Q1.The force on a sample of a material is gradually increased and then decreased. The graph
of force against extension is shown in the diagram.
The increase in thermal energy in the sample is represented by area
A R
B P+Q
C P+Q+R
D P+Q−R
(Total 1 mark)
Q2.(a) (i) A label on a capacitor shows it to have a capacitance of 0.020 F. Explain what
this tells you about the capacitor.
...............................................................................................................
...............................................................................................................
(1)
(ii) Sketch on Figure 1 the graph that shows how the charge on the 0.020 F
capacitor varies with the potential difference across it over the voltage range
given. Insert an appropriate scale on the charge axis.
(2)
(iii) Explain how your graph could be used to obtain the energy stored for a given
potential difference.
...............................................................................................................
Page 2
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, lOMoARcPSD|59658805
Colonel Frank Seely School
...............................................................................................................
...............................................................................................................
(2)
Figure 1 Figure 2
(iv) Show on Figure 2 how two similar capacitors could be connected to a supply
to store more energy for the same potential difference.
(1)
(b) Figure 3 shows one 0.020 F capacitor connected to a 20 V supply. By means of the
changeover switch S, the capacitor is disconnected from the supply and connected
to a small motor. The motor lifts an object of mass 0.15 kg through a height of 0.80
m, after which the energy left in the capacitor is negligible.
acceleration of free fall, g = 9.8 m s–2
Page 3
Downloaded by olinder seth ()
3.4 - exam questions
Biological science (University of Oxford)
Scan to open on Studocu
Studocu is not sponsored or endorsed by any college or university
Downloaded by olinder seth ()
, lOMoARcPSD|59658805
Colonel Frank Seely School
Exampro A-level Physics Name:
(7407/7408) Class:
3.4.1.7 Work, energy and power
Author:
Date:
Time: 626
Marks: 529
Comments
:
Page 1
Downloaded by olinder seth ()
, lOMoARcPSD|59658805
Colonel Frank Seely School
Q1.The force on a sample of a material is gradually increased and then decreased. The graph
of force against extension is shown in the diagram.
The increase in thermal energy in the sample is represented by area
A R
B P+Q
C P+Q+R
D P+Q−R
(Total 1 mark)
Q2.(a) (i) A label on a capacitor shows it to have a capacitance of 0.020 F. Explain what
this tells you about the capacitor.
...............................................................................................................
...............................................................................................................
(1)
(ii) Sketch on Figure 1 the graph that shows how the charge on the 0.020 F
capacitor varies with the potential difference across it over the voltage range
given. Insert an appropriate scale on the charge axis.
(2)
(iii) Explain how your graph could be used to obtain the energy stored for a given
potential difference.
...............................................................................................................
Page 2
Downloaded by olinder seth ()
, lOMoARcPSD|59658805
Colonel Frank Seely School
...............................................................................................................
...............................................................................................................
(2)
Figure 1 Figure 2
(iv) Show on Figure 2 how two similar capacitors could be connected to a supply
to store more energy for the same potential difference.
(1)
(b) Figure 3 shows one 0.020 F capacitor connected to a 20 V supply. By means of the
changeover switch S, the capacitor is disconnected from the supply and connected
to a small motor. The motor lifts an object of mass 0.15 kg through a height of 0.80
m, after which the energy left in the capacitor is negligible.
acceleration of free fall, g = 9.8 m s–2
Page 3
Downloaded by olinder seth ()
