1 ) When vector is multiplied by a ( +ve ) no. , its magnitude changes but when it is multiplied by a (-ve ) no. , so its ………. .................. changes.
A ) Only
magnitude , b
) Only direction ,
C ) Direction as well as magnitude , d ) None of these ,
Correct
answer : - C ) Direction as well as
magnitude ,
2 ) Huygens wave theory of light cannot
explain …….............………….. (Photoelectric effect).
Huygens wave theory of light explained interference , polarization of
light but cannot explains photoelectric effect of light due to particle’s
nature of light.
3 ) Only …………… is constant for satellite in orbit.
A ) Angular momentum , b ) Radius ,
C ) Time period , d ) None
of these .
Correct answer : - A ) Angular momentum ,
4 ) Becquerel is S.I
unit of …………...........
A ) Radioactivity . b
) Time dilation ,
C ) Photoelectric effect d ) None of these .
Correct answer : - A ) Radioactivity
.
5
) If earth stops rotating suddenly, then the value of g at equator would………….
A ) increases , b )
decreases ,
C ) no change , d
) None of these .
Correct answer : - A ) increases ,
6
) A source is said to be coherent , if
they have ……….…………… ,
A ) Non - Zero phase difference , B
) Zero phase difference ,
C ) Both of these , D ) None of these ,
Correct
Answer : - B ) Zero phase difference ,
7
) Magnifying power of telescope can be
increased by using Objective of ……………. ,
A ) large focal length , B ) Small focal length ,
C ) Both of these , D ) None of these ,
Correct
Answer : - A ) large focal length ,
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