Test
AQA GCSE Physics Unit 2.5
Este test tiene tiempo límite, así que se abre en el reproductor de siempre.
Preguntas del test (20)
1True or false? In alternating current, the potential difference switches between positive and negative values.
- AVerdadero
- BFalso
2Which of these statements are true about the UK mains supply?
- AFrequency of 50Hz
- BFrequency of 60Hz
- CPeak voltages of +230 and -230V
- DPeak voltages of +325 and -325V
- EDirect voltage of 230V
- FDirect voltage of 325V
3True or false? The device used to show how alternating potential difference varies with time is called a voltascope.
- AVerdadero
- BFalso
4What 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?
- A2.55V
- B4.53V
- C4.15V
- D2.65V
5What is the frequency of an AC supply if the length of one cycle is 4cm and the time-base control is 15ms/cm?
- A60Hz
- B0.06Hz
- C16.67Hz
- D0.02Hz
6What colour cable is the live wire in a three-core cable?
- AGreen and yellow
- BBrown
- CBlue
7What colour cable is the neutral wire in a three-core cable?
- AGreen and yellow
- BBrown
- CBlue
8What colour cable is the earth wire in a three-core cable?
- AGreen and yellow
- BBrown
- CBlue
9True 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.
- AVerdadero
- BFalso
10True or false? A circuit breaker is a piece of metal that melts if the current flowing through it is too large.
- AVerdadero
- BFalso
11What fuse would you need to buy if an appliance drew 2.7A of current?
- A1A
- B2A
- C3A
- D5A
- E13A
12True or false? Residual current circuit breakers break if the current in the live wire is different to the current in the neutral wire.
- AVerdadero
- BFalso
13Which of these equations connecting power, energy and time is correct?
- AP = E/t
- BP = t/E
- CP = Et
14Which of these equations connecting power, current and potential difference is correct?
- AP = I/V
- BP = V/I
- CP = IV
15What fuse would I buy if I bought a 230V, 1000W appliance?
- A1A
- B2A
- C3A
- D5A
- E13A
16How many units of charge would each electron carry if they carried 6A of current in 1 minute?
- A10C
- B0.1C
- C360C
17True or false? The equation connecting charge, potential difference and energy is Q = VE.
- AVerdadero
- BFalso
18What would be the potential difference of circuit in which 2000J of energy were carried by electrons with a charge of 4C?
- A8000V
- B500V
- C0.002V
19True or false? Connecting too many appliances to a single socket can lead to overheating.
- AVerdadero
- BFalso
20Which of these are considered energy-efficient bulbs?
- AFilament bulb
- BCompact fluorescent bulbs
- CLight-emitting diodes
- DHalogen bulbs
Información
- Descripción
- Twenty questions on the fifth section of Unit 2 in AQA GCSE Physics: Mains electricity.
- Autor
- Matthew T
- Idioma
- English
- Visitas
- 467
- Historial
- Creado el 17 may 2014 · actualizado el 23 dic 2016
- Etiquetas
- Valoración
- 4,6 de 5 · 5 valoraciones Valora este test