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WorksheetsQuiz
Total questions: 20
Worksheet time: 10mins
1. What does RGB stand for in an RGB LED?
a) Red-Gold-Blue
b) Red-Green-Black
c) Red-Green-Blue
d) Right-Gain-Base
2. Which leg of the LED is usually longer?
a) Negative
b) Positive
c) Ground
d) None of the above
3. What happens to an LED if its terminals are reversed?
a)Glow brighter
b)Glow dimmer
c)Not Glow
d)LED will burn
4. LED is related to these. Which one is the odd one out?
(Hint: Think about what an LED can and cannot do.)
a)Emits light
b)Diode
c)Semiconductor
d)Produces sound
5. What color will be produced if Red and Green LEDs are both on in an RGB LED?
a)Yellow
b)Cyan
c)Magenta
d)White
6. What does a rain sensor do?
a) Make light
b) Detect rain
c) Play music
d) Heat water
7.When water falls on the rain sensor, what happens?
a) The buzzer makes sound
b) The buzzer not makes sound
c) It becomes open circuit
d) Nothing happens
8. If a wire is cut between a battery and an LED so that electricity can’t flow, what is this
situation called?
a) Closed circuit
b) Open circuit
c) Short circuit
d) All the above
9. Which device is used to make a propeller rotate?
a) LED
b) DC Motor
c) Buzzer
d) Bulb
10. Which component helps to turn a fan ON and OFF?
a) Resistor
b) Switch
c) Capacitor
d) Bulb
11. What type of energy conversion takes place in hand-powerd torch?
a) Electrical Energy to Mechanical Energy
b) Mechanical to Electrical
c)Light Energy to Electrical Energy
d) Electrical Energy to Light Energy
12. What is the full form of LDR?
a) Light Drawing Resistor
b) Low Density Resistor
c) Light Dependent Resistor
d) Light Direct Receiver
13. What does an LDR do when light falls on it?
a) Resistance increases
b) Resistance decreases
c) It glows
d) It stops working
14. Which part is used to control brightness in the dimmer circuit
a) Battery
b) Switch
c) Variable resistor (potentiometer)
d) Wire
15. How many pins (terminals) does a typical variable resistor (potentiometer) have?
a) 1
b) 2
c) 3
d) 4
16.. What is the middle pin of a variable resistor usually called?
a) Source
b) Wiper
c) Ground
d) Power
17. What happens when current flows in the opposite direction through a DC motor?
a) Motor runs faster
b) Motor stops
c) Motor reverses direction
d) Nothing happens
18. Which sensor is used in Proximity- Based door Bell?
a) IR Sensor
b) Rain Alarm Sensor
c) PIR Sensor
d) Reed Sensor
19. What is the main purpose of an H-Bridge circuit?
a) To charge a battery
b) To turn a motor into a generator
c) To control the direction of a DC motor
d) To control sound from a speaker
20. What is the main use of a simple pulley?
a) To store electrical energy
b) To increase the speed of a motor
c) To lift or move heavy objects easily
d) To make sounds louder
