MICROBES IN AQUATIC ENVIRONMENT QUIZ

Any of the above

The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination

The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination

The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination

In the same direction as current

In a direction anti parallel to magnetic field

None of these

Normal to both current and magnetic field

Resistivity of Ni remains the same

Resistivity of Ni will decrease at all temperatures because Cu is a better conductor than Ni

Residual resistivity of Ni at low temperature will increase as Cu atoms act as defect centres

Resistivity of Ni will increase at all temperatures as Cu destroys the periodicity of Ni and acts as defects

False

True

Is almost equal to the number of valence electrons

Is a very small fraction of the number of valence electrons

Is about half the number of valence electrons

Is small as compared to the number of valence electrons

The nucleus will be shifted in the direction of E by an amount which is proportional to E.

The nucleus will be shifted in the direction of E by an amount which is independent of E.

The nucleus will not be shifted.

The nucleus will be shifted in a direction opposite to that of E.

False

True

Iron alloy cored

Sheet steel cored

Cast iron cored

Ceramic cored

True

False

Either B or C

Are shared by all atoms

Are shared only between neighbouring atoms

Are not shared