S2 Apocalypse Revision

Copy and complete the following sentences. Energy can be represented by the symbol ​ (a)   and is measured in joules or ​ (b)   for short. Energy can be calculated by multiplying power (P) by ​ (c)   (t) measured in seconds (s). Power is measured in ​ (d)   or ​ (e)   for short.

• E
• J
• time
• watts
• W
• Volts
• V
• T
• seconds
• power

Calculate the energy used by a TV that uses 20W of power in a 600 second advert break.

• 12,000 Joules

• 10,000 Joules

• 15,000 Joules

• 8,000 Joules

Calculate the energy used by a 900W industrial microwave being used to heat up soup for 2 minutes.

• 108,000 J

• 90,000 J

• 54,000 J

• 72,000 J

Calculate the energy used when having a 5-minute shower using a 7500 W electric shower.

• 15000 J

• 37500 J

• 2250000 J

• 3750000 J

Calculate the energy used by a kettle that takes 43 seconds to boil and uses 2200W of power.

• 94,600 Joules

• 95,000 Joules

• 92,000 Joules

• 90,000 Joules

Which of the following is an example of a physical barrier our body uses to stop infections?

• Skin

• Antibodies

• White blood cells

• Vaccines

The pH of a substance can be changed in various methods. Which of the following methods can change the pH of a substance?

• A. Dilution

• B. Neutralisation

• C. Both A and B

• D. None of the above

What is the main difference between germination and photosynthesis?

• Germination is the process of a seed developing into a plant, while photosynthesis is the process by which plants make their food.

• Germination occurs in the presence of sunlight, while photosynthesis occurs in the dark.

• Germination is a chemical process, while photosynthesis is a physical process.

• Germination requires water, while photosynthesis requires soil.

Which three of the following are required for germination to occur?

• Water

• Oxygen

• Warmth

• Sunlight

• Oil

Which three of the following are required for photosynthesis to occur?

• Carbon dioxide

• Glucose

• Oil

• Water

• Sunlight