Gooch Crucibles are made up of________________?
Gooch Crucibles are made up of________________?
A. plastic
B. fibre
C. porcelain
D. steel
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Percentage of lead in lead pencil is________?
Percentage of lead in lead pencil is________?A. Zero
B. 20
C. 80
D. 70Which of the following factors help to measure quallity of water ?
Which of the following factors help to measure quallity of water ?A. DO
B. BOD
C. COD
D. all of the aboveWhich compound is also known by the name of carbolic acid ?
Which compound is also known by the name of carbolic acid ?A. C2H2OH
B. H2CO3
C. C6H5OH
D. H3PO3The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?
The atomic number of an element having maximum number of unpaired electrons in p-subshell is_______________?A. 7
B. 10
C. 12
D. 16Pfund series are produced in the spectrum of hydrogen atom__________________?
Pfund series are produced in the spectrum of hydrogen atom__________________?A. when electrons jump down to 2nd- orbit
B. when electrons jump down to 3rd- orbit
C. when electrons jump down to 4th- orbit
D. when electrons jump down to 5th- orbitThe process in which solid changes directly into vapours without passing through liquid state?
The process in which solid changes directly into vapours without passing through liquid state?A. Decantation
B. Sublimation
C. Evaporation
D. None