When vector is multiplied by a (+ve) no. , its magnitude changes but when it is multiplied by a (-ve) no. , so its ……….

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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