Characteristics of alternating currents — Paper 1 · A Level Physics 9702

5 When a 12 V 50 Hz supply is connected to the Y-terminals of an oscilloscope, the trace in the diagram is obtained. 1 cm 1 cm What is the setting of the time-base control? A 2.0 ms cm–1 B 2.5 ms cm–1 C 5 ms cm–1 D 20 ms cm–1

1 marks

Answer: B

This question in 9702/11 Oct/Nov 2004

4 The Y-input terminals of a cathode-ray oscilloscope (c.r.o.) are connected to a supply of peak value 5.0 V and of frequency 50 Hz. The time-base is set at 10 ms per division and the Y-gain at 5.0 V per division. Which trace is obtained? A B C D

1 marks

Answer: D

This question in 9702/11 Oct/Nov 2006

4 The diagram shows an oscilloscope screen displaying two signals. X Y Signal X has a frequency of 50 Hz and peak voltage of 12 V. What is the period and peak voltage of signal Y? peak voltage period / ms / V A 20 4 B 20 12 C 50 4 D 50 12

1 marks

Answer: A

This question in 9702/11 Oct/Nov 2009

3 The diagram shows an oscilloscope screen displaying two signals. X Y Signal X has a frequency of 50 Hz and peak voltage of 12 V. What is the period and peak voltage of signal Y? peak voltage period / ms / V A 20 4 B 20 12 C 50 4 D 50 12

1 marks

Answer: A

This question in 9702/12 Oct/Nov 2009

4 The diagram shows a square-wave trace on the screen of a cathode-ray oscilloscope. A grid of 1 cm squares covers the screen. The time-base setting is 10 ms cm–1. 1 cm 1 cm What is the approximate frequency of the square wave? A 70 Hz B 140 Hz C 280 Hz D 1400 Hz Space for working

1 marks

Answer: B

This question in 9702/11 May/June 2010

36 A 100 Ω resistor conducts a current with changing direction and magnitude, as shown. 2 current / A 0 time –1 What is the mean power dissipated in the resistor? A 100 W B 150 W C 250 W D 400 W Space for working

1 marks

Answer: C

This question in 9702/12 Oct/Nov 2012

5 A cathode-ray oscilloscope displays a square wave, as shown in the diagram. The time-base setting is 0.20 ms per division. What is the frequency of the square wave? A 8.3 Hz B 830 Hz C 1300 Hz D 1700 Hz Space for working

1 marks

Answer: B

This question in 9702/13 Oct/Nov 2012

6 The Y-input terminals of a cathode-ray oscilloscope (c.r.o.) are connected to a supply of amplitude 5.0 V and frequency 50 Hz. The time-base is set at 10 ms per division and the Y-gain at 5.0 V per division. Which trace is obtained? A B C D

1 marks

Answer: D

This question in 9702/11 May/June 2013

4 A signal that repeats periodically is displayed on the screen of a cathode-ray oscilloscope. The screen has 1 cm squares and the time base is set at 2.00 ms cm–1. What is the frequency of this periodic signal? A 50 Hz B 100 Hz C 125 Hz D 200 Hz Space for working

1 marks

Answer: B

This question in 9702/11 Oct/Nov 2013

4 A signal that repeats periodically is displayed on the screen of a cathode-ray oscilloscope. The screen has 1 cm squares and the time base is set at 2.00 ms cm–1. What is the frequency of this periodic signal? A 50 Hz B 100 Hz C 125 Hz D 200 Hz Space for working

1 marks

Answer: B

This question in 9702/12 Oct/Nov 2013

5 The display on a cathode-ray oscilloscope shows the signal produced by an electronic circuit. The time-base is set at 5.0 ns per division and the Y-gain at 10 V per division. What is the frequency of the signal? A 2.0 × 10–8 Hz B 2.5 × 10–2 Hz C 5.0 × 107 Hz D 3.1 × 108 Hz Space for working

1 marks

Answer: C

This question in 9702/13 May/June 2014

25 A cathode-ray oscilloscope (c.r.o.) displays a waveform corresponding to a sound wave. In order to determine the frequency of the sound wave, which part of the displayed waveform must be measured and which c.r.o. setting must be known? on-screen c.r.o. setting measurement A amplitude time-base B amplitude Y-gain C wavelength time-base D wavelength Y-gain Space for working

1 marks

Answer: C

This question in 9702/13 May/June 2014

32 A 100 Ω resistor conducts a current with changing direction and magnitude, as shown. 2 current / A 0 0 1 2 3 4 5 6 7 8 time / ms –1 What is the mean power dissipated in the resistor? A 100 W B 150 W C 250 W D 400 W

1 marks

Answer: C

This question in 9702/11 May/June 2016

23 A trace is shown on the screen of a cathode-ray oscilloscope (c.r.o.). 1.0 cm 1.0 cm The time-base setting is 2.5 ms cm–1 and the Y-gain is 2.0 V cm–1. What is the frequency and the amplitude of the waveform displayed by the c.r.o.? frequency amplitude / Hz / V A 0.00375 4.0 B 0.00375 8.0 C 267 4.0 D 267 8.0

1 marks

Answer: C

This question in 9702/13 May/June 2017

6 A cathode-ray oscilloscope (c.r.o.) is connected to an alternating voltage. The following trace is produced on the screen. 1 cm 1 cm The oscilloscope time-base setting is 0.5 ms cm–1 and the Y-plate sensitivity is 2 V cm–1. Which statement about the alternating voltage is correct? A The amplitude is 3.5 cm. B The frequency is 0.5 kHz. C The period is 1 ms. D The wavelength is 4 cm.

1 marks

Answer: B

This question in 9702/12 Feb/March 2018

25 The diagram shows a cathode-ray oscilloscope display of an electromagnetic wave. 1.0 cm The time base setting is 0.20 µs cm–1. Which statement is correct? A The frequency of the wave is 2.5 MHz and it lies in the microwave region of the electromagnetic spectrum. B The frequency of the wave is 2.5 MHz and it lies in the radio-wave region of the electromagnetic spectrum. C The frequency of the wave is 5.0 MHz and it lies in the microwave region of the electromagnetic spectrum. D The frequency of the wave is 5.0 MHz and it lies in the radio-wave region of the electromagnetic spectrum.

1 marks

Answer: B

This question in 9702/12 Feb/March 2018

4 A cathode-ray oscilloscope displays a square wave, as shown. The time-base setting is 0.20 ms per division. What is the frequency of the square wave? A 0.83 Hz B 830 Hz C 1300 Hz D 1700 Hz

1 marks

Answer: B

This question in 9702/11 May/June 2020