GCSE GCSE Combined Science

Question 1

What is the equation for photosynthesis?

Accepted Answer

6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂

Answer

Glucose + Oxygen → Carbon dioxide + Water

Answer

CO₂ + H₂O → CH₂O + O

Answer

C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

Question 2

What is the difference between mitosis and meiosis?

Accepted Answer

Mitosis produces 2 identical daughter cells (for growth/repair); meiosis produces 4 genetically unique gametes (for reproduction)

Answer

Mitosis produces 4 genetically unique cells; meiosis produces 2 identical cells

Answer

Both are the same process

Answer

Meiosis occurs only in plants

Question 3

What is Newton's Second Law of Motion?

Accepted Answer

Force = mass × acceleration (F = ma)

Answer

Every action has an equal and opposite reaction

Answer

An object stays at rest unless acted on by a force

Answer

Momentum = mass × velocity

Question 4

What is an ionic bond?

Accepted Answer

A bond formed by transferring electrons from a metal to a non-metal, creating oppositely charged ions

Answer

A bond formed by sharing electrons

Answer

A bond between two non-metals

Answer

A weak bond between molecules

Question 5

What is the relationship between frequency, wavelength, and wave speed?

Accepted Answer

Speed = frequency × wavelength

Answer

Speed = frequency ÷ wavelength

Answer

Speed = frequency + wavelength

Answer

Frequency = speed × wavelength

Question 6

What is the half-life of a radioactive substance?

Accepted Answer

The time for half of the radioactive nuclei in a sample to decay

Answer

The time for all of the substance to decay

Answer

The total amount of radiation emitted

Answer

The energy released per decay