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The value of gravitational P.E. is____
always zero
always positive
always negative
may be positive or negative
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A plane electromagnetic wave of frequency 40 MHz travels in free space in the X-direction. At some point and at some instant, the electric field Er has its maximum value of 750 N/C in Y-direction.The wavelength of the wave is ____________
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If the heat of 120 J is added to gaseous system, whose internal energy is 50 J, then amount of external work done is —
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