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🔬 Science, Years 9 and 10

Years 9 to 10 · Read up first

10 questions. Get 8 right to earn 10 minutes. All 10 right = +5 bonus. They start easy and get harder as you go, so treat the first few as a warm-up. Every one you miss comes back with the answer and why.

1. Which of these is part of the electromagnetic spectrum?

Sound wavesSeismic wavesVisible lightOcean waves

2. What is electrical current measured in?

Watts (W)Ohms (ohm)Volts (V)Amperes (A)

3. An atom has 6 protons and 6 electrons. What is true about this atom?

It is electrically neutral, because the positive and negative charges balanceIt is positively charged overallIt is negatively charged overallIt cannot exist because the numbers are equal

4. According to Newton's first law, what happens to an object with no overall force acting on it?

It changes direction randomlyIt always speeds upIt always slows downIt keeps moving at a constant speed in a straight line, or stays still, if it was already still

5. Which type of electromagnetic radiation is used in microwave ovens to cook food?

MicrowavesGamma raysUltravioletRadio waves

6. Ohm's law is V = I x R. A circuit has a current of 2 A and a resistance of 6 ohm. What is the voltage?

12 V3 V8 V4 V

7. What is natural selection?

A sudden change in an organism's DNAThe process of an organism learning new skills during its lifeThe process where organisms better suited to their environment are more likely to survive and reproduceThe process of a scientist choosing which animals to breed

8. Which equation represents respiration?

C6H12O6 -> 6O2 + 6H2O6O2 -> 6CO26CO2 + 6H2O -> C6H12O6 + 6O2C6H12O6 + 6O2 -> 6CO2 + 6H2O

9. Why must a cell copy its DNA before it divides by mitosis?

So the cell can grow bigger before dividingSo each of the two new cells ends up with a complete, identical set of DNASo the cell can change its functionDNA does not actually need to be copied before mitosis

10. A population of insects is exposed to a pesticide. Over many generations, the insects become resistant to it. What is the best explanation using natural selection?

Insects that happened to already have resistance survived and reproduced more, passing resistance onThe pesticide directly changed every insect's DNA to make them resistantThe insects deliberately evolved resistance because they needed itResistance appeared by chance in every insect at the same time

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