Metals are good thermal conductors mainly because they contain
Salam Academy Original Practice · Proposed mark scheme
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Convection can happen in
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Which surface is the best emitter of infrared radiation?
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Energy reaches the Earth from the Sun by
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A water wave has a frequency of Hz and a wavelength of m. Calculate its speed.
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A sound wave travels at m/s with a frequency of Hz. Calculate its wavelength.
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waves pass a point in s. Calculate the frequency.
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A wave has a frequency of Hz. Calculate its period.
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In a transverse wave, the particles of the medium vibrate
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A ray strikes a plane mirror with an angle of incidence of . State the angle of reflection.
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A ray hits a mirror at to the mirror's surface. State the angle of incidence.
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A ray of light enters a glass block with an angle of incidence of . The angle of refraction is . Calculate the refractive index of the glass.
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A beam of light parallel to the principal axis passes through a converging lens. The rays
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An object cm tall forms an image cm tall. Calculate the linear magnification.
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A lens forms an image with magnification of an object cm tall. Calculate the image height.
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Which type of image can be formed on a screen?
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Which list is in order of increasing frequency?
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State the speed of electromagnetic waves in a vacuum, in m/s.
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Which electromagnetic wave is used to produce images of broken bones?
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A girl stands m from a cliff and claps. The speed of sound is m/s. Calculate the time before she hears the echo.
Salam Academy Original Practice · Proposed mark scheme