Uses of an Oscilloscope

An a.c. voltage is displayed on an oscilloscope screen. The Y-gain is set at $2.0\ \text{V/ cm}$.

What is the maximum value of the voltage?

Options

A   $2.0\ \text{V}$
B   $4.0\ \text{V}$
C   $8.0\ \text{V}$
D   $12\ \text{V}$

A magnet moves at constant speed through a coil of wire. The coil is connected to an oscilloscope. The diagram shows the trace produced on the screen.

The experiment is changed and a new trace is produced.

Which statement explains why the new trace is different from the original trace?

Options

A   The coil is longer and the other pole of the magnet enters the coil first.
B   The coil is longer and the same pole of the magnet enters the coil first.
C   The coil is shorter and the other pole of the magnet enters the coil first.
D   The coil is shorter and the same pole of the magnet enters the coil first.

The diagram shows the trace produced on the screen of an oscilloscope due to an alternating voltage input.

The time–base on the oscilloscope is set to $4\ \text{ms / cm}$.

What does the trace look like when the time base is set to $2\ \text{ms / cm}$?

Options

The sound wave produced by a note is displayed on the screen of a cathode-ray oscilloscope.

The time-base is set at $5\ \text{ms}$ for one division.

What is the frequency of the note?

Options

A   $20\ \text{Hz}$
B   $50\ \text{Hz}$
C   $60\ \text{Hz}$
D   $150\ \text{Hz}$

Sound waves are displayed as a trace on the screen of an oscilloscope.

Which trace shows a sound that becomes quieter with a higher pitch?

Options

In an alternating current (a.c.) generator, a magnet rotates near a coil of wire. The induced electromotive force (e.m.f.) in the coil is displayed on an oscilloscope screen.

Which trace is produced as the magnet slows down?

Options

A microphone detects a musical sound and the signal is fed into an oscilloscope. The diagram shows the trace which appears on the screen.

The spot of light on the oscilloscope screen takes 1.2 ms to travel across the screen.

What is the frequency of the musical sound?

Options

A   170 Hz
B   330 Hz
C   1700 Hz
D   3300 Hz

A cathode-ray oscilloscope with the Y-gain set at $2\ \text{V/division}$ is connected to a generator.

Which row describes the signal from the generator and its amplitude?

Options

A coil is rotating in a magnetic field. The coil is connected to an oscilloscope. The diagram shows the trace on the screen of the oscilloscope.

The coil now speeds up and rotates twice as fast.

Which diagram shows the new trace?

Options

An a.c. supply connected to an oscilloscope produces the trace shown.

A diode is now connected in series to the circuit as shown.

What is the new trace on the screen?

Options