AQA AS Physics

Topic Questions

1.1 Use of SI Units & Their Prefixes

1a3 marks

Use the equation Capacitance = fraction numerator C h a r g e over denominator P o t e n t i a l space D i f f e r e n c e end fraction   to write 1 Farad [F] in SI base units.

1b3 marks

A parallel plate capacitor of capacitance 75μF is connected to a 5 kV power supply.

Using the equation Charge = Potential difference × Capacitance, calculate the charge between the plates in mC.

1c4 marks

Rearrange the following capacitance in increasing magnitude:

             1 pF, 1 µF, 1 cF, 1 fF

1d2 marks

Estimate the current through an 1800 W kettle connected to a UK mains supply using the equation Power = Potential difference × Current 

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2a4 marks

Convert the following measurements into standard form.

   40000 kJ = ________________ J

   0.23 GW = _______________ W

   1.15 fm = ______________ m

   72.6 pC = _______________ C

2b4 marks

X-rays from a pulsar travel at the speed of light and are detected on earth with a wavelength of 5 nm. 

Using an appropriate equation, calculate the frequency of the X-rays in THz.

    

2c1 mark

X-rays from the nearest pulsar PSR J0109-1431 take 8.82 Gs to travel to Earth. 

Calculate the time it takes for the X-rays to reach Earth in seconds.        
2d3 marks

Show the distance from Earth to PSR J0109-1431 is around 280 light years.

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3a3 marks

Use the hydrostatic pressure equation to write 1 Pascal [Pa] in SI base units.

3b4 marks

A box is placed on the floor. The area of the box in contact with the floor is 4.9 cm2. The pressure exerted on the floor is 20 kPa. 

Using the equation linking Pressure, Force and Area, calculate the force exerted by the box on the floor. 

3c2 marks

Atmospheric pressure on Earth is 101 325 Pa. The Mariana trench at the bottom of the western Pacific Ocean has a pressure of around 110 MPa.

Calculate how many times larger the pressure of the Mariana trench is than the atmospheric pressure on Earth.
3d3 marks

Rearrange the following in order of decreasing pressure:

  • Atmospheric pressure at the summit of Mount Everest
  • Surface pressure on the Moon
  • Atmospheric pressure ~ 101 kPa
  • Water pressure of an average garden hose
  • The Mariana trench ~ 110 MPa

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4a3 marks

Use the equation linking Power, Current and Potential difference to write 1 Watt [W] in SI base units.

4b4 marks

Kilowatt-hour (kWh) is a unit of energy.

Using the equation linking Energy, Power and Time, convert 1 kWh to Joules.

4c1 mark

Convert your answer from part (b) into MJ.

4d4 marks

A 5.1 kW hair dryer is used for 45 minutes. The electricity bill is charged as 8 p per kWh used.

Calculate the cost of using the hairdryer in pounds.

  

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5a2 marks

Use the equation linking Force, Momentum and Time to write 1 Newton in SI units.

5b5 marks

To leave Earth, a rocket must travel at around 8 km s–1.

Calculate the thrust on a rocket which ejects 2.3 × 104 kg of waste gas per second to leave Earth in MN. Show all your working clearly.

5c2 marks

A rocket can hold 20 000 kg of material.

Calculate how many rockets would be needed to deliver 60 tonnes of material to a space station.

     

5d2 marks

Estimate the impulse on a tennis ball travelling at 70 m s–1 as it hits a racket.

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