Thursday, September 18, 2014

GCSE/ IGCSE Physics Sample Questions | Physics Tuition (All levels ) in Singapore, SMS +65 9372 7675 For Tutors! (Online Tuition Agency Assignments in Singapore)

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During the twentieth century red-shift and CMB radiation were discovered.
 They have provided scientists with data to test theories of the origin of the Universe.
 Complete the following sentence.
CMB is an abbreviation for ............................................................................................................
_
State which theory about the origin of the Universe is supported by the
existence of CMB.
_
There is a red-shift in the light received from some galaxies.
 State what is meant by red-shift
_
Some galaxies show greater red-shift than others.
 Explain what this suggests about the Universe.
_
Modern telescopes can provide us with more data than the telescopes used
100 years ago.
 Explain what additional data can be collected and processed using modern
telescopes.
_
Some students investigate the efficiency of electric motors.
 The students find that one electric motor has an efficiency of 60%.
 Explain in terms of energy what is meant by an efficiency of 60%.
_
Many earthquakes and volcanoes are linked to the production of infrasound
waves.
 Describe what is meant by infrasound waves.
_
The electromagnetic spectrum is continuous.
 Different regions of the spectrum have different properties.
Name an electromagnetic wave that is also an ionising radiation.
_
Genuine banknotes contain a special ink.
 This ink is invisible under normal light.
 Suggest why the ink glows when ultraviolet radiation is shone on it.
_
An electromagnetic wave has a frequency of 7 × 109 Hz.
 The speed of the wave is 3 × 108 m/s.
 Calculate the wavelength of the wave.
_
Radiation from different regions of the electromagnetic spectrum can affect the
human body in many ways.
 Discuss the different ways in which excessive exposure to electromagnetic
radiations of various frequencies may cause damage to the human body.
_
What is the name of the device used to change the size of an alternating voltage?
_
A LED lamp has a power rating of 3 W.
 The voltage across the lamp is 12 V.

 Calculate the current in the lamp.





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Source:
http://i2.kym-cdn.com/photos/images/original/000/075/499/pressure.jpg
http://pastpapers.edexcel.com/content/dam/pdf/GCSE/Science/2011/Question%20papers%20and%20mark%20schemes/5PH1H_01_que_20130605.pdf

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