Download The instrument used to measure the temperature of a human

In the circuit shown, the switch is open and capacitor
9V
uncharged.
S
R
C
When the switch is closed the voltage across the capacitor
20%
20%
5
20%
4
20%
3
5.
20%
2
4.
remains at 0V
gradually rises from 0 to 9V
immediately drops from 9V
to 0V
gradually drops from 9V to
0V
remains at 9V
1
1.
2.
3.
Identify the circuit symbol shown
e
20%
LE
D
N
20%
di
od
20%
O
T
20%
O
R
AND gate
OR gate
NOT gate
diode
LED
A
1.
2.
3.
4.
5.
N
D
20%
Which of the following electronic devices
contains a counter circuit?
er
re
c
io
ra
d
in
t
er
c
ei
v
om
er
rm
om
et
th
e
op
w
st
di
g
rk
in
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lig
at
c
h
ht
Automatic parking light
Digital stopwatch
Electronic thermometer
Intercom
Radio receiver
pa
1.
2.
3.
4.
5.
20% 20% 20% 20% 20%
A baby alarm needs an output device that
transforms electrical energy into sound energy.
Which of the following is suitable?
no
id
So
le
y
R
el
a
r
ak
e
pe
ud
s
Lo
tri
c
M
ot
or
Electric Motor
LED
Loudspeaker
Relay
Solenoid
El
ec
1.
2.
3.
4.
5.
LE
D
20% 20% 20% 20% 20%
Which of the following devices contains a
counter circuit?
20% 20% 20% 20% 20%
om
C
ra
ur
gl
a
B
o
ad
i
R
pu
te
r
rm
la
om
er
c
In
t
m
pl
ifi
e
r
Amplifier
Intercom
Burglar alarm
Computer
Radio receiver
A
1.
2.
3.
4.
5.
20%
20%
5
20%
4
20%
2
20%
1
1. convert an analogue signal
to a digital signal
2. transform an electrical
signal to a sound signal
3. transform a sound signal to
an electrical signal
4. increase the frequency of
an electrical signal
5. increase the amplitude of
an electrical signal
3
The purpose of the amplifier in a personal stereo is to
Which of the following is an output device?
Th
er
m
C
la
r
So
ho
ic
ro
p
M
20%
el
l
ne
20%
is
to
r
20%
D
20%
LE
LDR
LED
Microphone
Solar cell
Thermistor
LD
R
1.
2.
3.
4.
5.
20%
20%
20%
20%
5
4
electrical to sound
sound to electrical
chemical to sound
sound to chemical
electrical to chemical
1
1.
2.
3.
4.
5.
20%
3
20%
2
A telephone answering machine contains a
loudspeaker, which is used in playing back any
message received. The main energy transfer in
the loudspeaker is
Which of the following is an input device?
20% 20% 20% 20% 20%
ne
ro
ph
o
M
ic
Lo
ud
s
pe
ak
e
r
no
id
So
le
r
uz
ze
B
el
a
y
Relay
Buzzer
Solenoid
Loudspeaker
Microphone
R
1.
2.
3.
4.
5.
The symbol below is used to represent a
component in an electronic circuit.
What does it represent?
1. A NOT gate
2. An AND gate
3. A LDR
4. A LED
5. An OR gate
20%
20%
20%
20%
20%
Which of the following does not need a
magnetic field to make it work?
r
m
pl
ifi
e
A
el
l
B
El
ec
ot
or
M
El
ec
no
id
So
le
el
a
y
Relay
Solenoid
Electric Motor
Electric Bell
Amplifier
R
1.
2.
3.
4.
5.
20% 20% 20% 20% 20%
The following symbol is used in circuit diagrams.
The symbol represents a
1.
2.
3.
4.
20% 20% 20% 20% 20%
light emitting diode (LED)
light dependent resistor (LDR)
transistor
variable resistor
5
4
3
2
1
5. battery
20%
1. A…
20%
20%
20%
20%