rero 2

_____________ waves are waves which can travel through the vacuum of outer space.

• Sound

• Water

• Electromagnetic

Infrared _______ be seen by human eyes.

• can

• cannot

Which of the following animals have receptors in their eyes that receive IR waves

• bats

• dolphins

• snakes

• mice

Light Speed = ______________ km/s

• 3,000

• 30,000

• 300,000

• 3,000,000

Which of the following sensors cannot be functioned well under strong sunlight or spotlight?

• Motion Sensor

• Ultrasonic Sensor

• IR Sensor

• Sound Sensor

What symbol is this?

• LED

• Photodiode

• Battery

• Resistor

1, 2, 3 = ____ axis, ____ axis, ____ axis

• x, y, z

• x, z, y

• z, x, y

• y, x, z

Acceleration =

• the change of time

• the change of displacement

• the change of speed

• the change of acceleration

1, 2, 3 = ________________

• Controller, Sensors, Actuators

• Sensors, Actuators, Controller,

• Actuators, Sensors, Controller,

• Sensors, Controller, Actuators

The LED indicator is blinking ____ times

• 1

• 2

• 3

• 4