A ray from a fixed object is incident on a plane mirror at an angle…
A ray from a fixed object is incident on a plane mirror at an angle of 20o. If…
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a note of frequency 2000Hz has a velocity of 400 ms-1. calculate the wavelength of…
a note of frequency 2000Hz has a velocity of 400 ms-1. calculate the wavelength of the note A.…
The eclipse of the moon occurs when the
The eclipse of the moon occurs when the A. moon comes exactly between the earth and the sun…
The temperature of a liquid falls after some of it has evaporated because
The temperature of a liquid falls after some of it has evaporated because A. the liquid left is…
The S.I units of frequency, period and amplitude of a wave are respectively
The S.I units of frequency, period and amplitude of a wave are respectively A. hertz, second and centimeter…
The amount of energy required to change a kilogram of ice in water without a…
The amount of energy required to change a kilogram of ice in water without a change in temperature…
A quantity of steam at 100oC condenses to water at the same temperature by releasing…
A quantity of steam at 100oC condenses to water at the same temperature by releasing 6.9 x 104J…
The silvered surface in a vacuum flask reduces heat loos due to
The silvered surface in a vacuum flask reduces heat loos due to A. conduction B. convection C. radiation…
How long will it take to heat 3kg of water from 28oC to 88oC in…
How long will it take to heat 3kg of water from 28oC to 88oC in an electric kettle…
A block and tackle system has six pulleys. a force of 50N applied to it…
A block and tackle system has six pulleys. a force of 50N applied to it lifts a load…