Physics
Complete the following by choosing the correct answers from the bracket :
(a) A …………… [Class II / Class III] lever will always have M.A. > 1.
(b) A boy uses a GPS device to locate his missing friend in a crowded area; the system primarily uses …………… [ultraviolet waves / microwaves] to track the location.
(c) Unit of specific heat capacity is …………… . [kg2m2s-2K-1 / m2s-2K-1]
(d) The threshold of hearing is …………… . [0 dB / 20 Hz]
(e) Two copper wires can have different resistivity if they have different …………… . [lengths / temperatures]
(f) The reaction responsible for the production of energy in the sun is …………… . [Nuclear Fusion / Nuclear Fission]
Machines
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Answer
(a) A class II lever will always have M.A. > 1.
(b) A boy uses a GPS device to locate his missing friend in a crowded area; the system primarily uses microwaves to track the location.
(c) Unit of specific heat capacity is m2s-2K-1.
(d) The threshold of hearing is 0 dB.
(e) Two copper wires can have different resistivity if they have different temperatures.
(f) The reaction responsible for the production of energy in the sun is Nuclear Fusion.
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The amount of heat energy required to melt a given mass of a substance at its melting point without any rise in its temperature is called as the :
- specific heat capacity
- specific latent heat of fusion
- latent heat of fusion
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A nucleus of an atom consists of 146 neutrons and 95 protons. It decays after emitting an alpha particle. How many protons and neutrons are left in the nucleus after an alpha emission?
- protons = 93, neutrons = 142
- protons = 95, neutrons = 144
- protons = 93, neutrons = 144
- protons = 95, neutrons = 142
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