A boy sees the lightning flash then 4s later hears the thunder. The distance he is from the storm is approximately m km 3.136m m 5.680m 40

This is the pattern seen when a pupil whistles a note into a microphone connected to an oscilloscope. A second pupil whistles a louder note of lower frequency into the microphone. The pattern that would be seen is

The main energy change that takes place in the mouthpiece of a telephone is 1.Chemical to sound 2.Sound to chemical 3.Electrical to sound 4.Sound to electrical 5.Electrical to chemical 40

The main energy transfer in a loudspeaker is 1.Chemical to sound 2.Sound to chemical 3.Electrical to sound 4.Sound to electrical 5.Electrical to chemical 40

Electrical signals travel in telephone wires at a speed of 1.Less than the speed of sound 2.Almost equal to the speed of sound 3.Almost equal to the speed of light 4.Greater than the speed of light 5.Greater than the speed of radio waves 40

The diagram shows a side view of a water wave. The speed of the wave is: 1.24cm s mm s m s m s cm s -1 12m f= 4Hz 40

The frequency of a vibrating rod is 10Hz. What is its period? 1.10s 2.1s 3.0.1s 4.1ms 5.10ms 40

The speed of water is 4ms -1.if it has a wavelength of 50cm, what is its frequency? Hz Hz 3.8 Hz 4.80 Hz Hz 40

The part of the radio receiver that selects the one particular frequency is the 1.Aerial 2.Amplifier 3.Decoder 4.Loudspeaker 5.Tuner 40

In a radio the amplifier is used to: 1.Pick out one signal from all the signals 2.Make the electrical signal stronger 3.Change the electrical energy to sound energy 4.Change the sound energy to electrical energy 5.Supply the energy to the radio 40

Which of the following is the source of energy in a portable radio receiver? 1.Tuner 2.Decoder 3.Amplifier 4.Battery 5.Loudspeaker 40

The diagram below shows a ray of light striking a plane mirror.Which path shows the reflected ray?

The diagram shows light rays entering and leaving a box whose contents are hidden. Which object is in the box?

Which of diagrams below show the path of a ray of light through an optical fibre?

Fibre optics have certain advantages over ordinary copper cables.which of the statements below is not correct 1.Fibre optic cables are lighter 2.Fibre optic cables are cheaper 3.Fibre optic cables are thinner 4.Fibre optic cables lose more heat 5.Fibre optic cables corrode less 40

TV signals are sent from Britain to the USA using a satellite link. The device which sends the signals from Britain is called the: 1.Modulator 2.Decoder 3.Loudspeaker 4.Amplifier 5.Transmitter 40

The pictures seen on a colour television screen are produced by mixing the following colours of light. 1.Red yellow green 2.Red yellow blue 3.Red green blue 4.Green yellow blue 5.Green blue violet 40

The deflection plates in a TV tube are charged up as in the diagram. The beam will move to position

The period of a satellite orbit depends on 1.The mass of the satellite 2.The height above the earth 3.The length of an Earth day 4.About where on the Earth the satellite orbits 5.The rate at which the Earth is spinning 40

A satellite is geostationary if 1.It is not moving 2.It stops orbiting 3.It orbits above the same point on the Earth 4.It keeps changing speed 5.Its period is 12 hours 40