Transcript Document

Which of the signals below is a digital signal?
1.
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20%3.
20%4.
20%5.
20%
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The box below contains components used in electronics
Capacitor, thermistor, loudspeaker, relay ,
potential divider, LED, solar cell
The box contains:
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2 input devices and 5 output devices
3 input devices and 4 output devices
4 input devices and 3 output devices
5 input devices and 2 output devices
6 input devices and 1 output devices
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Which of the symbols below is
the correct symbol for LDR
1.
20%2.
20%3.
20%4.
20%5.
20%
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A resistor is usually placed in
series with a LED to
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Increase the current flowing in the LED
Give the current an alternative path
Reduce the voltage flowing through the LED
Increase the brightness of the LED
Reduce the current flowing through the LED
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Which of the components below would be a suitable
input device for a public address system at sports day
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20%2.
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20%5.
Relay
Buzzer
Solenoid
Loudspeaker
Microphone
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This is the symbol for which
electronic component?
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20%4.
20%5.
A NOT gate
An AND gate
An OR gate
A light dependent resistor
A light emitting diode
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In the circuit when the switch
is closed the reading on the
voltmeter rises slowly to 6v.
X
Which of the following
V
components could X be?
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Capacitor
Resistor
Bulb
Diode
LED
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When this circuit is switched
on the bulb lights dimly and
the LED is bright.
What would happen if the battery connections were
reversed?
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20%
2.
20%
20%
3.
20%
4.
20%
5.
The bulb goes out
The LED burns out
the bulb becomes a little duller
the bulb becomes a little brighter
The bulb and the LED go out
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Which single digit number on a
seven segment display uses the
most segments
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20%5.
Three
Four
Five
Eight
Nine
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A solar cell changes
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20%3.
20%4.
20%5.
Light energy to heat energy
Light energy to electrical energy
Light energy to chemical energy
Heat energy to electrical energy
Heat energy to light energy
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A Thermistor has a resistance of 1000Ω at 300oC
and 2000Ω at 1000C. It is connected to a 3V supply.
What could be the current in the circuit at 2000C?
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20%5.
0.5mA
1.0mA
1.5mA
2.0mA
3.0mA
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In this circuit V1 reads 2v
and V2 reads 7v. If the light level
was increased, what could be
the new readings on V1 and V2?
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V2
V1
1v and 8v
2v and 5v
2v and 8v
4v and 5v
5v and 4v
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When 11binary is multiplied by
11binary the answer in binary is
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100
101
121
1000
1001
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Which of the symbols below is the symbol for
a two input OR gate
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20%2.
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20%4.
20%5.
X
Y
The circuit above was designed to switch a
LED on when
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Switch X is on and switch Y is not on
Switch X is not on and switch Y is on
Switch X is on or switch Y is on
Switch X is not on or switch Y is not on
Switch X is not on and switch Y is not on
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This circuit is
designed to:
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Produce a voltage gain
Produce a power gain
Produce clock pulses
Produce a switched circuit
Produce a high voltage
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An amplifier has a voltage gain of 5. If the
input voltage is 12mv and the input current is
2mA, the output voltage of the amplifier is
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10mv
17mv
24mv
60mv
120mv
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Which of the following appliances
does not have an amplifier?
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20%5.
Hairdryer
CD player
Television
Telephone
Satellite receiver
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What is the least number of switches
that must be closed to light the LED
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20%2.
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20%4.
20%5.
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A voltage from a signal generator is fed
into an oscilloscope and the pattern to the
right is obtained.If voltage is now fed into
an amplifier with a gain of 2, what would
the pattern look like ?
25%
25%
25%
25%
1.
2.
3.
4.
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A voltage signal from a signal generator is fed into
an oscilloscope.The trace is shown below.
100%
1.
Enter answer text...
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