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Mass of an electron is- (a)1/1850gm (b)0.1gm (c)9.1x10-28 (d)None of the above ...
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The value of gas constant R for hydrogen is- (a)1/2 calorie (b)2 calories/mole Kelvin (c)4 calories (d)1 calorie Please explain how??? ...
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There is an equiconvex lens of focal length of 20 cm.If the lens is cut into two equal parts perpendicular to the principle axis,the focal length of each part will be- (a)20cm (b)10cm (c)40cm (d)15cm ...
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The door of a running refrigerator inside a closed room was left open.Then- (a)The room will be cooled slightly (b)The temperature of the room will be lowered (c)The temperature of the room will not be affected (d)The room wi ...
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In given gas,sound travels at a speed of 300m/s.Find the order of the root-mean-square velocity of the molecules of this gas- (a)40m/s (b)400m/s (c)4000m/s (d)4m/s ...
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An ice cube contains an iron ball in it and floats in water contained in a vessel.What will happen if the ice melts away? a. The water level will go up. b. The water level will go down c. There will be no change in the water ...
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When a newton's disc is rotated at a very high speed , why do the colours mix up and finally appear white??? ...
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(1)Why is sunlight yellow? (2)why does sky appear blue?by combining voilet,blue and indigo,we are supposed to get a darker blue,ryt???? ...
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why and how is D2O used as a moderator in nuclear reactors??? ...
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at sunset, the sun appears higher than its actual position....can u please explain y??? ...
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The half life of Uranium is 2.5 x 105 yrs.In how many years 75% of the original amount of Uranium will be disintegrated? (a)105 yrs (b)30 yrs (c)3 x 2.5 x 105 yrs (d)2 x 2.5 x 105 yrs ...
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what is exactly meant by tempering and how does it occur??? ...
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why is it said that a better and uniform crystallisation is obtained if a crystal is already placed in the solution,which when cooled crystallises and deposits on the crystal....???is it due to cohesion or something???please ...
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What is optical density exactly???why is it different from the normal density???both are based on the arrangement of molecules in diff. medium....then.... ...
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Can you people please name a site where I can learn about the mechanism of different simple gadgets like camera,telescope,radio etc. but with nice illustrations and simple words...please. ...
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A concave lens can be converging if it is placed in a liquid of (a) R.I more than its R.I (b)R.I less than its R.I (c)both cases possible (d)never possible ...
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The sum of the following series will be- 2 - 1/2*4 - 1/4*6 - 1/6*8 - ............- 1/48*50 is: (a)2.24 (b)2 (c)1.76 (d)0 ...
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Two cogged wheels of which one has 32 cogs and other 54 cogs work into each other.If the latter turns 80 times in three quarters of a min,how often does the other turn in 8 secs??? ...
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The no. obtained on reversing the digits is 594 less than the original no.the no. is....we have to solve it by using A.P;how??? ...
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if there are n arithmetic means between a and b,then common difference d is-(b-a)/(n+1).......how??? ...
