1 ) If three resistances R1 , R2 and R3 are connected in series . Such that R1 > R2 > R3 , then their equivalent resistance will be : -
A ) Re > R1 , B ) Re < R1 ,
C ) Re = R1 , D ) All of these ,
Correct Answer : - A ) Re > R1 ,
Because Re = R1 + R2 + R3 . So Re will be greater than all resistors ( R1 , R2 and R3 ) .
2 ) How much heat a 100 watt bulb will generate in 1 hour ?
A ) 0.36 MJ , B ) 0.36 kJ ,
C ) 3.6 MJ , D ) None of these ,
Correct Answer : - A ) 0.36 MJ ,
Solution : -
Formula : -
Here we use power formula : -
P = W / t = E / t ,
So , E = P x t .
E = 100 x ( 3600 secs ) = 360000 = 0.36 M joule . Answer .
3 ) When stream lines are close to each other , so pressure will be …… ,
A ) large , B ) small ,
C ) not effected , D ) None of these ,
Correct Answer : -
If stream lines does not cross each other , then flow is steady .
4 ) A convex lens is dipped in a liquid , whose refractive index is equal to material of lens . Its focal length will become …………. ,
A ) infinite , B ) finite ,
C ) smaller , D ) greater ,
Correct Answer : - A ) infinite ,
5 ) The equivalence of two systems in thermal equilibrium is represented by …………….. ( temperature ) .
6 ) Elastic waves in solids are ………………. ,
A ) longitudinal , B ) transverse ,
C ) both of these , D ) None of these ,
Correct Answer : - B ) transverse ,
7 ) The speed of waves in stretched string depends upon the ………… ( tension in the string ) .
8 ) ……...... is a process of releasing electron from heated metal surface .
A ) Thermionic emission , B ) Photoelectric effect ,
C ) X- rays emission , D ) None of these ,
Correct Answer : - A ) Thermionic emission ,
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