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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