The magnitude of resultant of two forces is 2F . If each force has magnitude of F , then what would be angle θ between them ?

1 ) The magnitude of resultant of two forces is 2F . If each force has magnitude of F , then what would be angle θ  between them ?

A ) 0 degree ,                          B ) 45 degree , 

C ) 90 degree ,                                D ) None of these ,

Correct Answer : -   A ) 0 degree , 

Solution : -

2 )  The nuclei as shown can be described as …………… ,

A ) isotopes ,                                           B ) isotones ,

C ) isobars ,                                             D ) None of these ,

Correct Answer : - B ) isotones ,

Isotopes : -  Same number of protons .

Isotones : -  Same number of neutrons .

Isobars : -  Same number of both protons and neutrons .

So in carbon : -  protons = 6 , neutrons = 7 .

In nitrogen : -  protons = 7 , neutrons = 7 .

So that it is described as isotones .

 

3 ) Mica is an example of ……….. ( insulators ) .

 

4 ) Life times of metastable excited state is …….. ,

A ) 10^(-2)        sec ,                                B ) 10^(-2) m sec ,

C ) 10^(-3)       sec ,                                D ) 10^(-3) m sec ,

Correct Answer : -  C ) 10^(-3) sec ,

 

5 ) Resistor shows ……… response in A.C and D.C .

A ) same ,                                                B ) different ,

C ) None of these ,

Correct Answer : -   A ) same ,     

 

6 ) In electromagnetic waves , visible rays lies ………… the ultraviolet rays and infrared rays .

A ) after ,                                         B ) between ,

C ) before ,                                              D ) None of these ,

Correct Answer : - B ) between ,

 

7 ) Alpha particles : - Helium nuclei ,

Beta particles : -  electrons ,

Gamma particles : - slow particles .

 

 

8 ) Formula for energy stored in capacitor : -

E = (1/2)(c)(v)^2  .

 

9 )  Three vectors of equal magnitude are acting on the three sides of an equilateral triangle . The magnitude of their resultant is , if each side is of 1 m ?

A ) 3 ,                                               B ) √3 ,

C ) √(3^2) ,                                               D ) √(3/2) ,

Correct Answer : -  B ) √3 ,

Solution:-

Formula : -

Resultant for equilateral triangle : -

R = √(Rx^2  +  Ry^2  +  Rz^2)  ,

So ,  Rx = Ry = Rz = 1  ,

R = √(1^2  +  1^2  +  1^2)  ,

R = √3 , Answer .     OR

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