# P1 OCR GATEWAY

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## Heating houses

The specific heat capacity of water is 4181 J/kg/°C and that of lead is 128 J/kg/°C. This means:

a)Lead melts at a low temperature

b)More ennergy is needed to boil water than is needed to boil lead

c)More energy is needed to heat water than is needed to heat the same mass of lead by the same amount

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## Heating Houses

As a solid melts:

a) Its temperature increases

b) Its tempertature stays the same

c) Its temperature decreases

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## Heating Houses

Which statement about units is correct?

a) Temperature is measured in °C and energy in W

b) Temperature is measured in °C and energy in J

c) Temperature is measured in °C and energy in K

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## Heating Houses

Which equation is correct?

a) energy= mass x specific latent heat x temperature

b) energy= mass x specific heat capacity x temperature

c) energy= mass x specific heat capacity x change in temperature

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## Heating Houses

Energy = mass x specific latent heat. If the specific latent heat of melting of water is 334 kJ/kg, how much energy is needed to melt 100 g of ice?

a) 33,400 kJ

b) 33.4 kJ

c) 3.34 kJ

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## Heating Houses

The specific latent heat of melting for lead is 22.4 kJ/kg and that of oxygen is 13.9 kJ/kg. This means:

a) more energy is needed to heat lead than is needed to heat the same mass of oxygen by the same amount

b) lead melts at a high temperature

c) more energy is needed to melt lead than is needed to melt oxygen

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## Keeping homes warm

How does heat pass through a single pane of window glass?

a) By conduction and radiation

b) By conduction and convection

c) By convection and radiation

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## Keeping homes warm

What substances can convection happen in?

a) Liquids and gases

b) Solids and gases

c) Solids and liquids

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## keeping homes warm

What are the best absorbers of thermal radiation?

a) Black, shiny surfaces

b) Black, dull surfaces

c) Light, dull surfaces

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## Keeping homes warm

An electric lamp is 25% efficient. If it receives 100 J per second of electrical energy, how much of this is transferred as light energy?

a) 25 J/s

b) 75 W

c)75 J/s

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## Waves

What is the unit of frequency?

a) s

b) Hz

c) m/s

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## Waves

Which is the correct equation?

a) Wave speed= frequency x wavelength

b) Wave speed= frequency / wavelength

c) Wave speed= frequency + wavelength

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## Waves

The distance from the crest of one wave to the crest of the next wave is called:

a) The frequency

b) The amplitude

c) The wavelength

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## Waves

What is the speed of a wave with a wavelength of 2 metres and frequency of 6 hertz?

a) 12 m/s

b) 8 m/s

c) 3 m/s

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## Spectrum of waves

Which of the following types of electromagnetic radiation has the longest wavelength?

a) Microwaves

b) Infrared radiation

c) X-rays

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## Spectrum of waves

Which type of electromagnetic radiation is used when mobile phones communicate with their base stations?

a) Infrared radiation

b) Radio waves

c) Microwaves

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## Spectrum of waves

Which of the following types of electromagnetic radiation has the highest frequency?

a) Visible light

b) Microwaves

c) Gamma radiation

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## Lights and Lasers

Light rays that are in the same phase as each other, and have the same frequency, typically form what sort of light?

a) Polarised light

b) Laser light

c) Diffracted light

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## Lights and Lasers

In the Morse code, how much longer than a dot is a dash?

a) Four times as long

b) Three times as long

c) Twice as long

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## Lights and Lasers

How do signals travel through optical fibres?

a) As infared radiation or visible light

b) As microwaves

c) As radiowaves

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