Please select a subject first
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Name the quality which is measured in kWh.
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One horse power is equal to ______.
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kWh is the unit of ______.
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A body, when acted upon by a force of 10 kgf, gets displaced by 0.5 m. Calculate the work done by the force, when the displacement is (i) in the direction of force, (ii) at an angle of 60° with the force, and (iii) normal to the force. (g = 10 N kg-1)
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When light travels from a denser to a rarer medium, its speed ______.
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A boy weighing 350 N climbs up 30 steps, each 20 cm high in 1 minute, Calculate:
- the work done and
- power spent.
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A man spends 7.4 KJ energy in displacing a body by 74 m in the direction in which he applies force in 2.5 s. Calculate the force applied.
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An ox can apply a maximum force of 1000 N. It is taking part in a cart race and is able to pull the cart at a constant speed of 30 ms-1 while making its best effort. Calculate the power developed by the ox.
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The wavelengths for the light of red and blue colours are roughly 7.8 × `10^7` m and 4.8 × `10^7` m respectively.
(a) Which colour has the greater speed in vacuum?
(b) Which colour has the greater speed in glass?
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Name the subjective property of light related to its wavelength.
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(a) Give a list of at least five radiations, in order of their increasing frequencies, which make up the complete electromagnetic spectrum.
(b) Which of the radiation mentioned by you in part (a) has the highest penetrating power.
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Arrange the following radiations in the order of their increasing wavelength:
X-rays, infrared rays, ratio waves, gamma ray and microwaves.
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Which radiation is used for satellite communication?
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A wave has a wavelength of 10-3 nm. Name the wave.
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What is the range of the wavelength of the following electromagnetic waves?
(a) Gamma rays.
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What is the range of the wavelength of the following electromagnetic waves?
(a)X-rays,
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What is the range of the wavelength of the following electromagnetic waves?
(a) Ultraviolet
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What is the range of the wavelength of the following electromagnetic waves?
(a) Visible.
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What is the range of the wavelength of the following electromagnetic waves?
(a) Infrared.
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What is the range of the wavelength of the following electromagnetic waves?
(a) Micro waves .
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