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The frictional force of the air on a body of mass 0.25 kg falling with an acceleration of 9.2 m/s² is

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If linear momentum of a body increases by 50%, then its kinetic energy increases by

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A wire of 3.00 m long and 0.625 cm² in cross section is found to stretch by 0.3 cm under a tension of 1200 kg. The Young’s modulus of the material of the wire is

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5g of ice at 0°C is dropped in a beaker containing 20g of water at 40°C. The final temperature will be (latent heat of ice = 80 cal/g)

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In the equation of state of classical ideal gas PV = nRT, n stands for

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The internal energy of a classical ideal gas depends upon

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The fastest mode of heat transfer is

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An iron tyre is to be fitted onto a wooden wheel 1.0 m in diameter. The diameter of the tyre is 6 mm smaller than that of the wheel. The tyre should be heated so that its temperature increases by a minimum of (coefficient of volume expansion of iron is $$3.6 \times 10^{-5}$$/°C)

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Light travels in two media A and B with speeds $$2 \times 10^8$$ m/s and $$2.4 \times 10^8$$ m/s respectively. The critical angle of these two media is

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Two straight and narrow parallel slits 5 mm apart are illuminated by a monochromatic light of wavelength $$5.9 \times 10^{-7}$$ m. The screen distance is 50 cm from the slits. The fringe width is

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