WorksheetsChristmas Science Quiz
Total questions: 25
Worksheet time: 13mins
Why do pine trees stay green at Christmas while many other trees lose their leaves?
They use less water in winter
They carry out more photosynthesis
They have needle-shaped leaves that reduce water loss
Their chloroplasts don’t break down
Why does pastry on a Christmas mince pie turn brown in the oven?
Sugar caramelises when heated
Oxidation of the metal tray
Respiration of the dough
Denaturation of gluten
Why can salt melt ice on roads during winter?
It raises the freezing point of water
It lowers the freezing point of water
It absorbs heat from the air
It reacts with ice to release heat
What gas is responsible for the bubbles in carbonated Christmas drinks?
Oxygen
Nitrogen
Carbon dioxide
Hydrogen
Which part of the nervous system makes you pull your hand away quickly from a cold metal pole outside at Christmas?
Cerebrum
Reflex arc in the spinal cord
Pituitary gland
Medulla
Why do Christmas candles burn?
Combustion of wax, which is mainly hydrocarbons
Evaporation of water
Melting of the wick
Breaking down of carbon dioxide
What causes the bright colours in Christmas fireworks?
Oxidation of metals
Electron transitions in metal ions
Burning nitrogen
Condensation of gases
Spruce trees absorb carbon dioxide. Which process uses CO₂?
Respiration
Photosynthesis
Fermentation
Diffusion
Why does hot chocolate cool down on a cold day?
It loses energy by radiation, conduction and convection
Energy disappears
Cold air forces heat out
Molecules stop moving
How does instant fake snow powder expand when water is added?
It dissolves into ions
It undergoes a chemical reaction
Water enters gaps in a cross-linked polymer network causing it to swell
Water freezes inside the powder
Reindeer store energy for cold climates. Which molecule stores the most energy per gram?
Carbohydrates
Proteins
Fats
Fibre
What process releases heat when you rub your gloved hands together at Christmas?
Endothermic reaction
Exothermic chemical reaction
Mechanical work converted to thermal energy
Condensation
Why do Christmas cookies rise in the oven?
Yeast respires anaerobically and produces carbon dioxide
Oxygen enters the dough
Water freezes
Proteins join together
Why might a poinsettia plant turn red near Christmas?
Reduced chlorophyll production
More photosynthesis
Less transpiration
More water uptake
What type of reaction occurs when magnesium burns in sparklers?
Oxidation
Reduction
Neutralisation
Precipitation
Why does your breath appear as mist on cold mornings?
Water vapour condenses into droplets
Carbon dioxide freezes
Respiration speeds up
Oxygen condenses
What type of sugar is found in candy canes?
Sucrose
Glucose
Lactose
Maltose
Why do Christmas lights wired in series switch off when one bulb fails?
The voltage increases
The circuit becomes open
Electrons reverse direction
The bulbs melt
Chestnuts roasting on a fire release energy. Which statement is true?
Energy is created when they burn
Energy is destroyed when they burn
Chemical energy is transferred to heat and light
Heat energy turns into atoms
Why does ice form on puddles at night in winter?
Water molecules lose energy and move slower
Water gains energy
Oxygen reacts with water
Freezing is an exothermic reaction
Why does a Christmas cracker snap when pulled?
Oxygen reacts with metal
A small amount of explosive undergoes a rapid oxidation reaction
Friction produces sound
Carbon dioxide expands in the paper
Which gas is most responsible for keeping Christmas jumpers warm by trapping heat near the body?
Oxygen
Nitrogen
Hydrogen
Carbon monoxide
Why do Brussels sprouts smell stronger when overcooked?
Proteins form new amino acids
Sulphur compounds are released as cells break down
Chlorophyll increases
Water evaporates leaving sugars behind
What happens to enzymes in your body when temperatures drop too low outdoors?
They denature instantly
Their activity decreases because particles move slower
They turn into fats
They speed up to keep you warm
Why does metal on a Christmas decoration feel colder than wood at the same temperature?
Metal reflects heat
Metal conducts heat away from skin more quickly
Wood gives off heat
Wood traps cold air
