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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