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A cyclist stops pedalling while moving along a frictionless hilly road. Which quantity remains constant? (a) Kinetic energy (b) Potential energy (c)…
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A blackened thermometer bulb placed beyond the red end of a spectrum shows a rise in temperature due to: (a) infrared radiations…
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The diagram shows a ray of light travelling from medium A to medium B. The refractive index of medium B with respect…
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The velocity ratio of a block and tackle system having two pulleys, with effort applied upwards, is: (a) 1 (b) 2 (c)…
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The energy transformation that takes place during photosynthesis is: (a) heat energy to chemical energy (b) chemical energy to light energy (c)…
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For a body to be in dynamic equilibrium: (a) its momentum must be zero (b) its acceleration must be zero (c) its…
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A copper rod PQ carrying current is kept in a magnetic field as shown in the diagram. (a) The copper rod PQ…
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(a) A certain amount of heat will warm 1 g of material X by 10°C and 1 g of material Y by…
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30 g of ice at 0°C is used to bring down the temperature of a certain mass of water at 70°C to…
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Three identical bulbs B1, B2 and B3, each of power rating 18 W, 12 V, are connected to a battery of 12…
