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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