1 ) A radioactive material has half life of 10 days . What fraction of materials would be remain after 30 ?
A ) 1 / 4 , B
) 1 / 8 ,
C ) 1 / 12 , D
) None of these ,
Correct
Answer : - B ) 1 / 8 ,
solution
: -
2 )
The half life of a radioactive substance is 10 days . This means that : -
A ) 1/8 parts of mass , if the substance will be left
intact at the end of 40 days .
B ) 7/8 part of mass of substance disintegrates in 30
days .
Correct
Answer : - B ) 7/8 part of mass of
substance disintegrates in 30 days .
Solution
: -
3 )
A certain radioactive element has half life of 4 days . The fraction of
material that decays in 2 days ?
A ) ( √2 – 1 ) /
√2 , B
) ( 1 - √2 ) / √2 ,
C ) 1 / √2 , D
) None of these ,
Correct
Answer : - A ) ( √2 – 1 ) / √2 ,
Solution
: -
4
) In a transistor , if ( α = IC / IE and
β = IC / IB ) α – varies between
20/21 and 100/101 , Then value of β lies between : -
A ) 20 – 101 , B
) 20 – 100 ,
C ) 21 – 101 , D
) None of these ,
Correct
Answer : - B ) 20 – 100 ,
Solution
: -
5 )
A Geiger counter ( Geiger - Muller tube ) is a device used for detection and
measurement of ......... radiations .
A ) alpha , B
) beta ,
C ) gamma , D
) All of these ,
Correct
Answer : - D ) All of these ,
6 )
Typical source of beta - particle is ............. ( Strontium – 90 ) .
Now go to online quiz section and Physics Quiz 8 is uploaded related to these mcqs , so check your preparation by this link : -
