WorksheetsTriple IGCSE Whole Course
Total questions: 150
Worksheet time: 1hrs 15mins
Which unit is used for measuring force in the SI system?
second (s)
metre per second (m/s)
newton (N)
kilogram (kg)
Average speed is calculated by which expression?
distance moved ÷ time taken
time taken ÷ distance moved
change in velocity ÷ time taken
final speed − initial speed
On a distance–time graph, a straight line with constant positive gradient indicates what motion?
constant speed forward
increasing acceleration
stationary object
motion with decreasing speed
Acceleration is defined as which of the following?
rate of change of distance
rate of change of velocity
rate of change of time
rate of change of speed
Which formula correctly relates acceleration to change in velocity and time?
a = v ÷ t
a = (v − u) ÷ t
a = t ÷ (v − u)
a = u × v × t
On a velocity–time graph, the area under the curve represents which quantity?
resultant force
change in momentum
acceleration of motion
distance travelled
The gradient of a velocity–time graph gives which physical quantity?
acceleration value
force applied
distance covered
speed of travel
Which equation links final speed, initial speed, acceleration, and distance moved?
v = u + at
s = ut + 1/2 at²
v² = u² + 2as
F = ma
Which statement best describes a vector quantity?
has magnitude only
has direction only
has magnitude and direction
has units but no value
Friction is known as a force that does what?
changes mass
increases speed
creates momentum
opposes motion
What is the relationship between unbalanced force, mass, and acceleration?
F = m + a
F = a ÷ m
F = m × a
F = m ÷ a
Weight is related to mass and gravitational field strength by which formula?
W = m + g
W = m ÷ g
W = m × g
W = g ÷ m
Which combination makes up the stopping distance of a vehicle?
engine plus tyre distance
rolling plus sliding distance
impact plus rebound distance
thinking plus braking distance
Which factor increases thinking distance for a driver?
lower mass of vehicle
shorter reaction time
greater road friction
higher vehicle speed
For falling objects, reaching terminal velocity is explained by what balance?
mass equals acceleration
weight equals air resistance
speed equals distance
force equals momentum
In the initial linear region of a force–extension graph for a spring, which law applies?
Ohm’s law
Kepler’s first law
Hooke’s law
Newton’s third law
Momentum is defined by which relationship?
p = m × v
p = m + v
p = v ÷ m
p = m ÷ v
Which principle allows calculation of unknown masses or velocities during collisions?
conservation of mass
conservation of charge
conservation of momentum
conservation of energy
Which expression links force to change in momentum over time?
F = (mu − mv) × t
F = (mv − mu) ÷ t
F = (mv + mu) ÷ t
F = t ÷ (mv − mu)
Newton’s third law states which of the following?
forces cause acceleration
every action has equal opposite reaction
energy is conserved in systems
weight acts through centre of gravity
The moment of a force about a pivot equals which product?
mass × acceleration
force × perpendicular distance
force × time
weight × height
Where does the weight of a body act?
through its base contact
through its highest point
through its centre of gravity
through its geometric centre
For a light beam supported at both ends, placing a heavy object near the left end causes what change?
equal upward forces remain
no change in reactions
greater upward force at left
greater upward force at right
Which unit measures electric current in a circuit?
watt (W)
coulomb (C)
ampere (A)
volt (V)
Which quantity is measured in joules?
electric current
electric charge
electrical energy
electrical resistance
A safe appliance casing is connected to earth. What is the main purpose of earthing?
reduces appliance power
prevents overheating coils
increases mains voltage
provides path for fault current
Which device interrupts a circuit automatically when current is too high?
transformer unit
double insulator
resistor pack
circuit breaker
In a resistor, current causes an energy transfer mainly into what form?
thermal energy
sound waves
light emission
chemical energy
Which equation links electrical power, current, and voltage?
P = I + V
P = V ÷ I
P = I × R
P = I × V
Energy transferred in an electrical device is given by which expression?
E = Q × R × t
E = V × R × t
E = I × V × t
E = I × R × t
Mains electricity is typically which type of current?
alternating current
steady direct current
constant voltage current
pulsed direct current
Which circuit type is preferable for domestic lighting so one lamp failing does not stop others?
balanced bridge
single-loop circuit
parallel circuit
series circuit
In a series circuit, the current is mainly affected by which factors?
supply voltage and component resistances
lamp brightness and fuse rating
wire color and switch type
battery size and casing material
What happens to current when the resistance of a circuit increases, assuming constant voltage?
current oscillates randomly
current stays identical
current decreases
current increases
Which statement about an LDR and a thermistor is correct?
thermistor resistance never changes
thermistor resistance increases when warmed
LDR resistance decreases with light
LDR resistance increases with light
Which relation links voltage, current, and resistance?
V = P × t
R = V ÷ I²
I = V × R
V = I × R
What is electric current in a metal conductor at the particle level?
flow of electrons
flow of positive ions
flow of neutral atoms
flow of photons
At a junction in a circuit, what must be conserved?
resistance value
current flow
power rating
voltage drop
Two resistors are connected in parallel. What is true about the voltage across them?
varies with wire length
the same across both
lower on the smaller resistor
higher on the larger resistor
Which statement about voltage and energy per charge is correct?
volt is ampere per ohm
volt is joule per coulomb
volt equals joule per second
volt equals watt per second
Which equation relates charge, current, and time?
Q = P × t
Q = I × t
Q = R × t
Q = V × t
Electrostatic charging by friction most directly involves which process?
fusion of atoms
absorption of photons
creation of new protons
movement of electrons
Which hazard can arise from electrostatic charges when refuelling aircraft?
engine overcooling
spontaneous magnetization
spark ignition of fuel
battery reverse charging
Which unit is used to measure frequency of a wave?
second (s)
degree (°)
hertz (Hz)
metre per second (m/s)
In a transverse wave, which direction do particle vibrations occur relative to energy transfer?
opposite to propagation
parallel to propagation
perpendicular to propagation
along curved paths
Which statement best describes longitudinal waves?
no vibrations while traveling
vibrations random in direction
vibrations perpendicular to travel
vibrations parallel to travel
Which quantity is the number of wave cycles per second?
period
wavelength
amplitude
frequency
Which relationship correctly links wave speed, frequency, and wavelength?
v = f ÷ λ
v = λ × T
v = λ ÷ f
v = f × λ
A wave has period T. What is its frequency?
f = v × T
f = 1/T
f = λ/T
f = T/λ
All electromagnetic waves in free space share which property?
same speed
same amplitude
same wavelength
same frequency
Which ordering shows decreasing wavelength across the electromagnetic spectrum?
gamma → radio
infrared → microwave
radio → gamma
visible → ultraviolet
Which electromagnetic wave is commonly used for broadcasting communications?
x-rays
microwaves
radio waves
ultraviolet
Excessive exposure to ultraviolet light primarily risks which effect?
bone density increase
internal tissue heating
damage to surface cells and blindness
sterilising food contamination
Which law describes reflection of light at a mirror?
angle of reflection equals critical angle
angle of refraction equals angle of incidence
angle of incidence equals angle of reflection
angle of incidence equals refractive index
What does the refractive index n equal for a ray entering a material?
n = sin i / sin r
n = sin r / sin i
n = 1 / sin c
n = v / f
What is the critical angle c within a material?
angle giving zero reflection
angle between wavefronts
angle for total internal reflection
angle giving maximum refraction
Which relation connects critical angle and refractive index?
sin c = 1/n
sin c = 1/λ
sin c = n
sin c = n²
Sound waves are classified as which type of wave?
longitudinal waves
transverse waves
electromagnetic waves
standing waves
What is the typical frequency range of human hearing?
200–200 000 Hz
20–20 000 Hz
2–20 Hz
2–2000 Hz
Increasing the frequency of a sound source changes pitch in which way?
pitch stays constant
pitch becomes higher
pitch becomes lower
pitch becomes random
Increasing the amplitude of vibration of a sound source affects loudness how?
loudness becomes irregular
loudness unchanged
loudness decreases
loudness increases
What change in observed frequency occurs when a source moves toward an observer?
frequency stays identical
frequency decreases
frequency increases
frequency becomes zero
When a light ray enters a denser medium at an angle, which effect occurs?
no refraction occurs
refraction away from the normal
refraction toward the normal
reflection only
Which unit measures the rate of energy transfer in physics?
metre (m) per second
joule (J) per second
newton (N) per metre
kilogram (kg) per hour
Which quantity is measured in newtons?
Time taken for a process
Distance moved by an object
Energy stored in a battery
Force exerted by a push
Which statement best describes an energy store?
A way energy is kept in a system
A path energy takes between objects
A unit used to measure energy
A device that produces electricity
Which pair lists two energy stores correctly?
Sankey and magnetic
Radiation and sound
Mechanical and heating
Chemical and elastic
Which transfer method moves thermal energy through direct particle collisions?
Convection of fluids
Conduction of heat
Electrical resistance
Radiation by waves
What does the principle of conservation of energy state?
Energy is only stored chemically
Energy increases in all processes
Energy depends only on temperature
Energy cannot be created or destroyed
A device has 200 J input and 50 J useful output. What is its efficiency?
25% efficiency
40% efficiency
50% efficiency
75% efficiency
Which diagram is commonly used to represent energy flows and efficiency?
Ray diagrams
Free-body diagrams
Vector diagrams
Sankey diagrams
Which surface property increases absorption and emission of thermal radiation?
Shiny metallic surfaces
Smooth and white surfaces
Dull and black surfaces
Transparent glass surfaces
Which method primarily reduces unwanted energy transfer from a house?
Installing insulation
Painting walls
Adding heavier furniture
Opening more windows
Which equation links work done, force, and distance moved in the force direction?
W = F × d
GPE = m g h
P = W ÷ t
KE = ½ m v²
What is work done equal to in energy terms?
Power consumed
Energy transferred
Force multiplied
Speed squared
Which formula gives gravitational potential energy near Earth’s surface?
F = m a
KE = ½ m v²
P = W ÷ t
GPE = m g h
A 3 kg object moves at 4 m/s. Its kinetic energy is
12 joules
48 joules
36 joules
24 joules
Power is defined as
Total energy stored
Amount of force applied
Rate of energy transfer
Distance moved per time
A motor transfers 600 J in 20 s. What is its power?
30 watts
60 watts
120 watts
300 watts
Which resource is non-renewable for electricity generation?
Geothermal
Fossil fuels
Wind power
Solar cells
Which advantage is common to wind and solar electricity?
Low fuel cost and low emissions
Stable output regardless of weather
Short construction and decommission
High energy density of fuel
Which SI unit is used to measure pressure in physics?
Newton per square metre
Joule per kilogram degree
Kilogram per cubic metre
Metre per second squared
Which unit correctly measures density of a material?
Kilogram per cubic metre
Newton per metre squared
Joule per kilogram kelvin
Metre per second
Which temperature scale has an absolute zero at 0 K?
Kelvin temperature scale
Celsius temperature scale
Fahrenheit temperature scale
Rankine temperature scale
For mass m and volume V, which expression gives density ρ?
ρ equals m divided by V
ρ equals V divided by m
ρ equals m times V
ρ equals V minus m
Pressure p is defined by which relationship for force F on area A?
p equals F minus A
p equals F times A
p equals A divided by F
p equals F divided by A
At rest, how does pressure at a point act in a liquid or gas?
Equally in all directions
Only horizontally outward
More along flow direction
Only vertically downward
Which unit is used for specific heat capacity in this course?
Watts per kilogram kelvin
Joules per kilogram degree Celsius
Joules per mole kelvin
Calories per gram kelvin
Which statement best describes particle motion in gases?
Ordered paths in layers
Fixed positions vibrating only
Random motion colliding with walls
Circular orbits around nuclei
Which relation gives pressure difference in a fluid column of height h and density ρ?
Δp equals g divided by h ρ
Δp equals h plus ρ plus g
Δp equals ρ divided by h g
Δp equals h times ρ times g
Which statement about Kelvin temperature and kinetic energy is correct?
Directly proportional relationship
Inversely proportional relationship
Unrelated at constant volume
Proportional only for liquids
A block has mass 2.0 kg and volume 0.001 m³. What is its density?
500 kilograms per cubic metre
2 kilograms per cubic metre
2000 kilograms per cubic metre
0.5 kilograms per cubic metre
A force of 80 N acts uniformly on an area of 0.02 m². What is the pressure?
8000 pascals
1600 pascals
40 pascals
4000 pascals
Heating a system increases which energy change when temperature rises by ΔT?
m c ΔT for thermal energy
m g h for potential energy
½ m v² for kinetic energy
P t for electrical energy
During melting, the temperature of a pure substance at its melting point tends to
Oscillate with random fluctuations
Increase steadily as heat is added
Remain constant while energy changes state
Decrease due to latent cooling
Which set of base units corresponds to pressure?
kg m s⁻²
kg m⁻¹ s⁻²
kg m⁻³ s
kg m² s⁻²
Gas at constant temperature follows which qualitative trend between pressure and volume?
Pressure decreases as volume increases
Pressure increases as volume increases
Pressure fluctuates without pattern
Pressure independent of volume change
For a fixed mass of gas at constant temperature, which equation holds?
ΔQ equals m c ΔT
V equals m over ρ
p₁ over T₁ equals p₂ over T₂
p₁V₁ equals p₂V₂
For a fixed mass of gas at constant volume, which equation relates pressure and Kelvin temperature?
p₁ over T₁ equals p₂ over T₂
p₁V₁ equals p₂V₂
p equals F over A
ρ equals m over V
A liquid column 0.5 m deep has density 1200 kg/m³. Take g = 10 N/kg. What is the pressure difference between top and bottom?
6000 pascals
1200 pascals
24000 pascals
500 pascals
A 0.80 kg copper block with c = 385 J/kg°C cools by 5°C. What thermal energy change occurs?
1540 joules released
308 joules absorbed
3850 joules released
1925 joules absorbed
Which unit measures electric current in circuit problems?
ampere (A)
ohm (Ω)
volt (V)
watt (W)
What best describes the interaction between two like magnetic poles?
they cancel magnetism
they attract strongly
they rotate together
they repel each other
Which material property suits making a permanent magnet?
thermally conductive
magnetically hard
magnetically soft
electrically resistive
What is a magnetic field line?
edge of a magnet
line showing field direction
line of electric current
path of moving charges
Placing iron in a magnetic field can cause what effect?
thermal expansion
electric breakdown
induced magnetism
optical reflection
Two bar magnets are arranged to produce a uniform field between them. Which orientation works best?
opposite poles facing
like poles facing
side-by-side lengthwise
stacked end-to-end
An electric current in a straight conductor produces what around it?
a thermal gradient
an electric spark
a pressure wave
a magnetic field
Which diagram shows the magnetic field around a long straight wire carrying current?
radial spokes outward
zigzag segments
parallel straight lines
concentric circles
In a loudspeaker, why is there a force on the voice coil?
current in magnetic field
sound pushing the cone
heat expanding the coil
gravity pulling downward
Which hand rule predicts the force direction on a current-carrying wire in a magnetic field?
Lenz’s law
left-hand rule
right-hand grip
Fleming’s thumb rule
How does force on a current-carrying conductor change when field strength doubles and current is unchanged?
force reverses
force unchanged
force halves
force doubles
When a conductor cuts magnetic field lines, what is produced across it?
an induced voltage
a heating effect
a light emission
a mechanical stress
Increasing the speed of coil rotation in a generator affects the induced voltage in what way?
voltage becomes DC
voltage unchanged
voltage decreases
voltage increases
A transformer changes voltage by which design feature?
thicker iron casing
different turns numbers
parallel input coils
higher input current
Which statement describes a step-up transformer used in transmission?
more primary turns
more secondary turns
no iron core needed
equal turns both sides
For an ideal transformer, which relationship holds when efficiency is 100%?
power equals voltage
Ip = Is always
Vp = Vs always
Vp Ip = Vs Is
Which unit measures the activity of a radioactive source?
centimetre (cm)
hour (h)
becquerel (Bq)
minute (min)
Which particles reside in the nucleus of an atom?
protons and neutrons
electrons only
protons and electrons
neutrons and electrons
What does the atomic (proton) number represent?
number of protons
number of neutrons
number of nucleons
number of electrons
Which statement best describes an isotope?
same protons, different neutrons
same neutrons, different protons
different electrons, same nucleons
same mass, different charge
Which radiation has the greatest ionising ability?
visible light
gamma rays
beta particles
alpha particles
Which radiation is most penetrating through lead?
gamma rays
infrared waves
alpha particles
beta particles
Which detector can reveal ionising radiation exposure?
barometer sensor
ohmmeter device
thermometer probe
Geiger–Müller tube
Which source contributes to background ionising radiation?
cosmic rays
sound waves
visible light
thermal conduction
As time passes, the activity of a radioactive source generally
oscillates randomly
stays exactly constant
increases in becquerels
decreases in becquerels
Half-life is defined as the time taken for
charge to vanish
temperature to rise
mass to double
activity to halve
A sample has activity 800 Bq and a half-life of 2 hours. What is its activity after 4 hours?
200 Bq
100 Bq
400 Bq
800 Bq
Which statement distinguishes contamination from irradiation?
contamination adds radioactive material
irradiation creates new atoms
contamination is harmless exposure
irradiation means physical transfer
Which is a danger of ionising radiation to living tissue?
strengthening membranes
causing mutations
improving cell repair
reducing chemical reactivity
In nuclear fission of U-235, what initiates the split?
gamma absorption
neutron collision
electron bombardment
proton capture
Fission of U-235 typically produces
no neutrons released
pure electromagnetic waves
one larger nucleus
two daughter nuclei
A chain reaction occurs when
fission neutrons cause more fissions
control rods absorb all neutrons
moderator speeds up neutrons
gamma rays split nuclei directly
What is the role of control rods in a reactor?
detect emitted gamma
compress the coolant
moderate fuel temperature
absorb excess neutrons
Nuclear fusion is best described as
joining small nuclei
splitting heavy nuclei
emitting alpha particles
ionising outer electrons
Why does fusion require high temperature and pressure?
increase electron speed
overcome proton repulsion
reduce neutron capture
cool the plasma faster
What is the primary energy source for stars?
gravitational collapse
chemical combustion
radioactive decay
nuclear fusion
Which unit measures gravitational field strength in astrophysics?
kilogram per second, kg/s
metre per second squared, m/s²
newton per metre, N/m
newton per kilogram, N/kg
Which list correctly shows base and derived SI units used in astrophysics?
kg, m, s, N, m/s, m/s²
kg, cm, hr, J, km/s
g, m, s, Pa, m/min
kg, m, s, °C, mph
What best describes a galaxy?
a cloud of interstellar gas only
a large collection of billions of stars
a small cluster of a few planets
a single star with many moons
Our solar system belongs to which galaxy?
the Milky Way galaxy
the Andromeda galaxy
the Triangulum galaxy
the Sombrero galaxy
Why is gravitational field strength g different on the Moon than on Earth?
the Moon rotates faster than Earth
the Moon receives less sunlight
the Moon has thicker atmosphere
the Moon has lower mass and radius
Which effect is caused by gravitational force in planetary systems?
moons orbit planets
planets spin on axes
comets emit visible light
asteroids create seasons
Which statement about artificial satellites is correct?
They are stationary above poles
They repel Earth’s gravity
They hover using solar wind
They orbit Earth due to gravity
Comets usually have which kind of orbit compared to planets?
highly elliptical, long-period
nearly circular, short-period
random, non-gravitational
perfectly parabolic, zero-period
Which equation gives orbital speed v for a circular orbit?
v = 2πr / T
v = T / 2πr
v = rT / 2π
v = 2π / rT
A satellite orbits at radius 7.0×10^6 m with period 6.3×10^3 s. What is its orbital speed?
about 7.0 km/s
about 14 km/s
about 1.1 km/s
about 3.5 km/s
How are stars commonly classified in basic astrophysics?
by the shape of nebulae
by the age of galaxies
by the number of planets
by their colour categories
A bluer star compared to a redder star typically has what property?
temperature unrelated to colour
identical surface temperature
lower surface temperature
higher surface temperature
Which sequence shows the life cycle of a Sun-like star?
nebula → main sequence → red giant → white dwarf
white dwarf → red giant → main sequence → nebula
main sequence → nebula → white dwarf → red giant
nebula → red giant → main sequence → white dwarf
