1
1 mark
1 markThe diagram below shows the oscilloscope trace for an electrical signal.
The time-base setting of the oscilloscope is 2 μs cm−1.
What is the frequency of the signal?
125 Hz
250 Hz
125 kHz
250 kHz
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Use of Measuring Instruments & Electrical Equipment (OCR A Level Physics)
Exam Questions
9 mins9 questions21 mark
1 markA student is investigating the angular deflection with respect to the current. He plots the graph between angular deflection and current for an analogue ammeter as shown in the graph
Which diagram(s) does not represent the appearance of the scale on these meters?
Diagram 1
Diagram 2
Diagram 3
Diagram 4
1, 2 and 3
2,3 and 4
Only 2 and 3
Only 1
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31 mark
1 markA student is investigating the relationship between current and resistance.
He uses a variable resistor in his circuit to make changes in the current and resistance.
Fig.1 shows the top of a variable resistor with a scale of resistance, which gives the resistance in use.
Fig. 1
What range of values of resistance are available with this resistor?
0 – 5 Ω
0 – 10 Ω
0 – 8 Ω
0 – 100 Ω
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41 mark
1 markA student uses a micrometer to measure the thickness t of tissue paper. The tissue paper is folded in half two times and the total thickness is measured. The micrometer is shown in Figure 3
Fig. 3
What is the value of the thickness t ?
0.295
0.59
1.18
2.36
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51 mark
1 markA student uses a cathode-ray oscilloscope (c.r.o) to determine the frequency of the electric signal emitted by an AC generator. The trace produced on the screen of the c.r.o. is shown in Fig. 4.
Fig. 4
The frequency of the electric signal is 2000 Hz
What is the time-base setting (µs cm-1) of the c.r.o?
0.0002
0.2
200
500
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11 mark
1 markA wave travelling at a speed of 125 m s-1 with a wavelength of 20 cm is being measured by an oscilloscope. The reading from the oscilloscope is shown below.
What is the time base of the oscilloscope?
1.6 ms div-1
6.25 s div-1
0.2 ms div-1
12.8 ms div-1
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21 mark
1 markA micrometre is used to measure the thickness of the wire and the reading is shown below. The resolution of the main scale and thimble scale is 0.5 mm and 0.01 mm respectively.
What is the lowest possible value of the cross-sectional area of the wire?
4.13 × 10−5 m2
1.35 × 10−3 m2
1.18 × 10−5 m2
1.03 × 10−5 m2
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31 mark
1 markBelow are four different circuit diagrams and a statement about the diagram. The potential difference of the cell is 10 V.
Which one of the statements is true?
A. |  | The bulb will not light up |
B. |  | The potential difference of the diode is 10 V |
C. |  | The bulb will light up |
D. |  | The current through the diode is 0 A |
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41 mark
1 markA student conducted an experiment to determine the acceleration due to gravity by dropping a ball from a height of 1.8 m. The time it took the ball to hit the floor was measured with a stopwatch and a light gate three times. The resolution of the light gate and the stopwatch is 0.01 s.
The results from the experiment are shown below.
| Component A t / s | Component B t / s |
Reading 1 | 0.62 | 0.85 |
Reading 2 | 0.61 | 0.80 |
Reading 3 | 0.62 | 0.88 |
Which statement is true?
The readings from component B are neither precise or accurate
The readings from Component A are most likely from the stopwatch
Component B is more accurate than component A
The uncertainty in the readings from the stopwatch is ± 0.005 s
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