A bulb contains air at atmospheric pressure at `40^(@)C`. The maximum pressure bulb can with stand is `2` atmosphere. Calculate of air when the bulb is on the point of bursting.
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Ammonia contains 82.32% of nitrogen and 17.65 % of hydrogen . Water contains 88.90% of oxygen and 11.10% of hydrogen . Nitrogen trioxide contains 63.1
In `NH_(3), 17.65 g` of H combine with N=82.35 g `therefore` 1 g of H combine with H`=(82.35)/(17.65) g` =4.66 g In `H_(2)O, 11.10 g` of H combine with O=88.90...
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A light bulb is rated 100W for a 220V supply. The resistance of the bulb and the peak voltage of the source respectively are
Resistance of a bulb`=(("Rated voltage")^(2))/("Rated power")` `=((220)^(2))/(100)=484Omega` Peak voltage of the source. `V_(0)=220sqrt(2)V=311V`
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The pressure at the bottom of an open tank of water is 3p where p is the atmospheric pressure. If the water is drawn out till the level of water remai
Correct Answer - B `P+hrhog=3P" "....(1)` `hrhog=2P` `P=P+(4)/(5)hrhog" "....(2)` From (1) and (2) `P=P+(4)/(5)xx2P" "impliesP=(13P)/(5)`
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A bulb is designed to operate at `12` volts constant direct current.If this bulb is connected to an alternating current source and gives same brightne
Correct Answer - `12sqrt2` volts `V_(@)=V_(rms)xxsqrt2=12sqrt2` , `V_(@)=V_(rms)xxsqrt2=12sqrt2`
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Calculate the work done when 50 g of iron is dissolved in HCl at `25^(@)C` in (i) a cloed vessel and (ii) an open beaker when the atmospheric pressure
(i) When the reactiion is carried in a closed vessel, the change in volume is zero. Hence, the work done by the system will be zero. (ii) when iron dissolves...
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A bulb of 40 W is producing a light of wavelength 620 nm with `80%` of efficiency , then the number of photons emitted by the bulb in 20 seconds are :
Correct Answer - D Power`=(nhC)/(lambdaxxt) rArr 40xx80/100=(nxx6.62xx10^(-34)xx3xx10^(8))/(620xx10^(-9)xx20) rArr n=2xx10^(21)`
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How much energy is absorbed by 10 moles of an ideal gas if it expands from an initial pressure of 8 atmosphere to 4 atmosphere at a constant temperatu
Correct Answer - `1.728xx10^(4)J` In isothermal process, `DeltaU=0` so, q(heat absorbed)=-w. Thus, apply the equation `q=2.303nRT" log "(P_(1))/(P_(2))`
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To what pressure must a certain ideal gas `(gamma=1.4)` at 373 K and 1 atmospheric pressure be compressed adiabatically in order to raise its temperat
Correct Answer - 7.89 atm
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The brightness of an incandescent light bulb is con- trolled by a regulator. The regulator is a variable resistor connected in series with the bulb. W
Correct Answer - It become reddish. Average photon enrgy decreases.
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An electric bulb has a solid cylindrical filament of length `l` and radius `r` and it consumes power P when connected to a power source. Another bulb
Correct Answer - `2l,4r`
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