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Start learning 50% faster. Sign in nowLet the work ‘M’ = 6 units (LCM of 6 and 3) Efficiency of P = 6/6 = 1 units Efficiency of Q = 6/3 = 2 units Efficiency of P, Q and R = (6 × 6)/6 = 6 units per day Efficiency of R = 6 – (1 + 2) = 3 units per day Time taken by R to finish work ‘N’ = 36/3 = 12 days
Tungsten is used for the manufacture of the filament of an electric bulb, because –
Which of the following electromagnetic waves are used for detection like Geiger tubes?
Which of the following is not a vector quantity?
The polarization of electromagnetic waves demonstrates that they are:
The threshold wavelength for a photoelectric surface is 540 nm. Will a light of energy 2.5 eV cause photoemission?
Going from fluorine to chlorine, to bromine and then to iodine, the electro negativity:
Which of the following is an example of a non-renewable source of energy?
For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:
Which physical quantity has unit “Joule/second”?
The balance point in a potentiometer for a cell of emf 1.5 V is 60 cm. If a resistance of 5 Ω is connected in parallel with the cell and the new balanc...