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- 1. Multiple Choice
P
Q
R
S
- 2. Multiple Choice
200m
300m
360m
480m
- 3. Multiple Choice
- 4. Multiple Choice
The foreign atom P is a
monovalent atom
divalent atom
trivalent atom
pentavalent atom
- 5. Multiple Choice
- 6. Multiple Choice
the resistor R is disconnected
the surrounding is bright
the terminals of the battery are reversed
the surrounding is dark
- 7. Multiple Choice
0 0
0 1
1 0
1 1
- 8. Multiple Choice
What should be done so that the bulb will light up?
use a new bulb
increases the number of dry cells
reverse the connection of the diode
connect a resistor in series with the bulb
- 9. Multiple Choice
100Hz, 2V
100Hz, 1V
50Hz, 2V
50Hz, 1V
- 10. Multiple Choice
lnterchange R1 and LDR
Reverse the terminal of the battery
Replace the npn transistor with a pnp transistor
lnterchange R1 and R3
- 11. Multiple Choice
Which transistor circuits will lights up the bulb?
- 12. Multiple Choice
100
101
011
001
- 13. Multiple Choice
If c, b and e have the usual meanings for a transistor, which one of the following transistors is correctly labelled?
- 14. Multiple Choice
Direct current, tIme base off
Direct current, tIme base on
Alternating current, tIme base off
Alternating current, tIme base on
- 15. Multiple Choice
The galvanometer pointer is deflected to the left
The galvanometer pointer is not deflected
The galvanometer pointer is deflected to the right
The galvanometer pointer oscillates to the left and then to the right.
- 16. Multiple Choice
A thermistor and a transistor are connected in a fire alarm circuit. The resistance of the thermistor decreases as the temperature rises.
Which of the following circuits will cause the bell to ring when there is a fire?
- 17. Multiple Choice
OR
AND
NOR
NAND
- 18. Multiple Choice
AND
OR
NOR
NAND
- 19. Multiple Choice
A light-dependent resistor (LDR) is a resistor which is sensitive to light. The resistance of the
LDR is low when surrounding is bright and high in the dark.
Which circuit will light up the bulb at night?
- 20. Multiple Choice
Both Y-input and time base are switched off
Y-input is connected to battery and the time base is switched off
Y-input is connected to alternating current power supply and the time base is switched off
Y-input is connected to alternating current power supply and the time base is switched on
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