 # AQA GCSE Physics Unit 2.5

Quiz by , created over 5 years ago

## Twenty questions on the fifth section of Unit 2 in AQA GCSE Physics: Mains electricity. 355 26 0  Created by Matthew T over 5 years ago
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### Question 1

Question
True or false? In alternating current, the potential difference switches between positive and negative values.
Answer
• True
• False

### Question 2

Question
Which of these statements are true about the UK mains supply?
Answer
• Frequency of 50Hz
• Frequency of 60Hz
• Peak voltages of +230 and -230V
• Peak voltages of +325 and -325V
• Direct voltage of 230V
• Direct voltage of 325V

### Question 3

Question
True or false? The device used to show how alternating potential difference varies with time is called a voltascope.
Answer
• True
• False

### Question 4

Question
What is the peak voltage of an AC supply whose peak is 3.4cm from the centre and whose Y-gain control is 0.75V/cm?
Answer
• 2.55V
• 4.53V
• 4.15V
• 2.65V

### Question 5

Question
What is the frequency of an AC supply if the length of one cycle is 4cm and the time-base control is 15ms/cm?
Answer
• 60Hz
• 0.06Hz
• 16.67Hz
• 0.02Hz

### Question 6

Question
What colour cable is the live wire in a three-core cable?
Answer
• Green and yellow
• Brown
• Blue

### Question 7

Question
What colour cable is the neutral wire in a three-core cable?
Answer
• Green and yellow
• Brown
• Blue

### Question 8

Question
What colour cable is the earth wire in a three-core cable?
Answer
• Green and yellow
• Brown
• Blue

### Question 9

Question
True or false? Appliances with plastic cases such as hairdryers only need two-core cable as they are doubly-insulated and do not need to be earthed.
Answer
• True
• False

### Question 10

Question
True or false? A circuit breaker is a piece of metal that melts if the current flowing through it is too large.
Answer
• True
• False

### Question 11

Question
What fuse would you need to buy if an appliance drew 2.7A of current?
Answer
• 1A
• 2A
• 3A
• 5A
• 13A

### Question 12

Question
True or false? Residual current circuit breakers break if the current in the live wire is different to the current in the neutral wire.
Answer
• True
• False

### Question 13

Question
Which of these equations connecting power, energy and time is correct?
Answer
• P = E/t
• P = t/E
• P = Et

### Question 14

Question
Which of these equations connecting power, current and potential difference is correct?
Answer
• P = I/V
• P = V/I
• P = IV

### Question 15

Question
What fuse would I buy if I bought a 230V, 1000W appliance?
Answer
• 1A
• 2A
• 3A
• 5A
• 13A

### Question 16

Question
How many units of charge would each electron carry if they carried 6A of current in 1 minute?
Answer
• 10C
• 0.1C
• 360C

### Question 17

Question
True or false? The equation connecting charge, potential difference and energy is Q = VE.
Answer
• True
• False

### Question 18

Question
What would be the potential difference of circuit in which 2000J of energy were carried by electrons with a charge of 4C?
Answer
• 8000V
• 500V
• 0.002V

### Question 19

Question
True or false? Connecting too many appliances to a single socket can lead to overheating.
Answer
• True
• False

### Question 20

Question
Which of these are considered energy-efficient bulbs?
Answer
• Filament bulb
• Compact fluorescent bulbs
• Light-emitting diodes
• Halogen bulbs