PHYSICS 2 ASSESSMENT

Question 1

What is the primary function of a diode?

Answer 1

A diode primarily allows current to flow in one direction only.

Question 2

True or False: A variable resistor can change its resistance.

Answer 2

True

Question 3

What does LED stand for?

Answer 3

LED stands for Light Emitting Diode.

Question 4

Fill in the blank: A _____ is used to protect circuits from excessive current.

Answer 4

fuse

Question 5

What is a thermistor used for?

Answer 5

A thermistor is used to measure temperature changes.

Question 6

True or False: An LDR is a light-dependent resistor.

Answer 6

True

Question 7

What happens to the resistance of a thermistor as temperature increases?

Answer 7

The resistance decreases as temperature increases.

Question 8

Multiple Choice: Which component emits light when current passes through it? A) Diode B) LED C) Variable Resistor D) Fuse

Answer 8

B) LED

Question 9

What is the main characteristic of a fuse?

Answer 9

A fuse is designed to stop the circuit when the current exceeds a certain level.

Question 10

Fill in the blank: An LDR’s resistance decreases in _____ light.

Answer 10

bright

Question 11

What does a variable resistor do?

Answer 11

changes the amount of resistance in a circuit

Question 12

True or False: Diodes can be used for rectification in circuits.

Answer 12

True

Question 13

What is the function of a fuse in an electrical circuit?

Answer 13

To protect the circuit from overcurrent.

Question 14

Multiple Choice: Which device is commonly used in temperature sensing applications? A) LED B) Thermistor C) Diode D) Fuse

Answer 14

B) Thermistor

Question 15

What does a light-dependent resistor (LDR) do?

Answer 15

An LDR changes its resistance based on the intensity of light.

Question 16

Fill in the blank: A diode has a forward bias and a _____ bias.

Answer 16

reverse

Question 17

True or False: Variable resistors are also known as potentiometers.

Answer 17

True

Question 18

What is the typical use of an LED in circuits?

Answer 18

Emits light when current flows through it.

Question 19

Multiple Choice: Which component can be used to control the brightness of a light? A) Diode B) Fuse C) Variable Resistor D) Thermistor

Answer 19

C) Variable Resistor

Question 20

What type of current does a diode allow to pass?

Answer 20

Direct current (DC)

Question 21

Fill in the blank: A _____ resistor is sensitive to temperature changes.

Answer 21

thermistor

Question 22

True or False: An LDR can be used in automatic street lighting systems.

Answer 22

True

Question 23

What happens to the current in a circuit when a fuse blows?

Answer 23

The current is interrupted and stops flowing.

Question 24

What is the primary difference between a thermistor and a regular resistor?

Answer 24

A thermistor’s resistance changes significantly with temperature, while a regular resistor’s resistance remains constant.

Question 25

Multiple Choice: What happens to the resistance of an LDR in darkness? A) Increases B) Decreases C) Remains the same D) Fluctuates

Answer 25

A) Increases

Question 26

why do metals such as copper, zinc or tin conduct electricity?

Answer 26

because they are transition metals and i between the ions they have a sea of delocalised electrons which can carry charge.

Question 27

Charge Flow =

Answer 27

Current x Time

Question 28

Electric charge is?

Answer 28

a fundamental property of matter everywhere.

Question 29

Electrical power is?

Answer 29

filling the modern world with artificial light and sound and entertainment.