Physics-
General
Easy

Question

If emf of battery is 100 V, then what was the resistance of Rheostat adjusted at reading ( i=2A,V=20V)

  1. 10W    
  2. 20W    
  3. 30W    
  4. 40W    

The correct answer is: 40W

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In the experiment, the curve between VX andVW is shown as dotted line (A) If we use an another wire of same material, but with double length and double radius. Which of the curve is expected.

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The adjacent graph shows the extra extension (Vx) of a wire length 1m suspended from the top of a roof at one end with an extra load Vw connected to the other end . If the cross sectional area of the wire is 10 to the power of negative 6 end exponent m to the power of 2 end exponent, calculate the Young’s modulus of the material of the wire.

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Catalyst only

Catalyst only

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Iftext end text f colon left square bracket negative 2 comma 2 right square bracket rightwards arrow R text  is end text defined by f left parenthesis x right parenthesis equals open curly brackets table row cell fraction numerator square root of 1 plus c x end root minus square root of 1 minus c x end root over denominator x end fraction comma text end text text f end text text o end text text r end text text end text minus 2 less or equal than x less than 0 end cell row cell fraction numerator x plus 3 over denominator x plus 1 end fraction comma text end text text f end text text o end text text r end text text end text 0 less or equal than x less or equal than 2 end cell end table close is continuous on [-2,2] then c =

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Colloidal sol is :

Colloidal sol is :

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Colloidal sol is :

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The number of circular division on the shown screw gauge is 50. It moves 0.5 mm on main scale for one complete rotation and main scale has 1/2 mm marks. The diameter of the ball is:

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The decomposition of H subscript 2 O subscript 2 may be checked by adding a small quantity of phosphoric acid. This is an example of :

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