Light
Sound
ELECTRICITY-3
ELECTRICITY-4
ELECTRICITY-5
100
What is light?
A) A form of matter that can be touched and seen.
B) A type of electromagnetic wave that allows us to see objects.
C) A type of sound wave that travels through air.
D) A substance that only travels in straight lines.
B) A type of electromagnetic wave that allows us to see objects.
100
How is sound produced and how does it travel through a medium?
A) Sound is produced by the movement of air molecules and travels in the form of longitudinal waves with compressions and rarefactions.
B) Sound is produced by light vibrations and travels as transverse waves through a vacuum.
C) Sound is produced by electrical energy and travels in the form of longitudinal waves without compressions or rarefactions.
D) Sound is produced by heat vibrations and travels in the form of electromagnetic waves.
A) Sound is produced by the movement of air molecules and travels in the form of longitudinal waves with compressions and rarefactions.
100
What is electricity?
A) The movement of sound waves through air.
B) The flow of electric charge through a conductor.
C) The interaction of light with matter.
D) The transfer of thermal energy between objects.
B) The flow of electric charge through a conductor.
100
If you place a 50 Volt power source across a 10 Ohm resistor, what will the current be?
I = V/R = 50/10 = 5 A
100
What part of a circuit is this object?
Energy source
200
describe using appropriate scientific terminology what a concave lens does to the rays of light that pass through it.
A concave lens is a diverging lens that causes parallel rays of light passing through it to spread out or diverge. This occurs because the lens is thinner in the centre and thicker at the edges. When light passes through a concave lens, the rays are refracted outwards, away from the principal axis.
200
The distance from the crest (high point) of a wave to the next crest is called the
a) wavelength
b) frequency
c) trough
d) velocity
a) wavelength
200
What is Ohm's law
V= RI
Voltage = resistance * Current
200
Does this diagram represent a series or parallel circuit?
Series circuit
200
Does this diagram represent a series or parallel circuit?
Parallel
300
What does the Law of Reflection indicate?
The angle of incidence= the angle of reflection
(i=r)
300
The speed of sound:
a) Depends on the medium through which it travels.
b) Is constant throughout the universe.
c) Is the same as the speed of light.
d) Depends on the speed of electrons moving in a transverse direction.
a) Depends on the medium through which it travels.
300
If you have a 12 Volt battery placed across a 6 Ohm resistor, what will the current be?
I = V/R = 12/6 = 2 A
300
Does this diagram represent a series or parallel circuit?
Parallel Circuit
300
Draw a circuit diagram containing 3 bulbs, a battery and 2 switches. The circuit should have 1 switch that will turn “on” and “off” only 1 bulb and the other switch will turn “on” and “off” both the other 2 bulbs.
Teacher checks the answer.
400
Which wave has the longest wavelength?
Radio waves
400
How does temperature affect the speed of sound in a medium?
A) As the temperature increases, the particles in the medium move slower, causing the speed of sound to decrease.
B) As the temperature increases, the particles in the medium move faster, causing the speed of sound to increase.
C) The speed of sound is unaffected by changes in temperature.
D) The speed of sound decreases as the temperature increases due to more frequent collisions between particles.
B) As the temperature increases, the particles in the medium move faster, causing the speed of sound to increase.
400
In a circuit, how are an ammeter and a voltmeter connected?
A) Ammeter is connected in series, and voltmeter is connected in parallel.
B) Ammeter is connected in parallel, and voltmeter is connected in series.
C) Both ammeter and voltmeter are connected in parallel.
D) Both ammeter and voltmeter are connected in series.
A) Ammeter is connected in series, and voltmeter is connected in parallel.
400
What happens to the brightness of the light bulbs in a series circuit when you add more lights.
Each bulb gets dimmer
400
What is the main purpose of an electrical transformer?
A) To convert electrical energy into mechanical energy.
B) To increase or decrease the voltage of an alternating current (AC) signal.
C) To store electrical energy for later use.
D) To convert direct current (DC) into alternating current (AC).
B) To increase or decrease the voltage of an alternating current (AC) signal.
500
When a light ray passes from air into water, which of the following happens?
A) The light ray bends away from the normal because water is denser than air.
B) The light ray bends towards the normal because water has a higher refractive index than air.
C) The light ray continues in a straight line with no bending.
D) The light ray speeds up as it enters the water.
B) The light ray bends towards the normal because water has a higher refractive index than air.
500
Two people are on a fishing trip. They send an ultrasound pulse into the water below, as shown in the diagram. It takes 0.6 seconds to return.
Calculate how far below the boat the fish are likely to be. Use the speed of sound waves in water as 1500 m/s in your calculations. Ensure your answer has units.
o.6/2=0.3s
0.3*1500= 450m
500
What is the unit of measurement for electrical current?
Ampere (A)
500
Does this diagram re
Parallel
500
What kind of circuit is this?
Series