A.\(h = \dfrac{{3V}}{{\pi {r^2}}}\)  
B.\(h = \dfrac{{3V}}{{\pi r}}\)
C.\(h = \dfrac{V}{{\pi {r^2}}}\)
D.\(h = \dfrac{V}{{\pi r}}\)

A.\({a^5}\)
B.\({a^{\frac{2}{5}}}\)
C.\({a^2}\)
D.\({a^{\frac{5}{2}}}\)

A.\(55\pi c{m^2}\)
B.\(80\pi c{m^2}\)
C.\(70\pi c{m^2}\)
D.\(110\pi c{m^2}\)

A.1
B.2
C.0
D.3

A.2
B.1
C.0
D.3

A.1
B.6
C.36
D.720

A.\(3 + {\log _a}b\)
B.\(\dfrac{1}{3} - {\log _a}b\)
C.\(3 - {\log _a}b\)
D.\(\dfrac{1}{3} + {\log _a}b\)

A.3
B.1
C.2
D.0

A.\(9,{1.10^{ - 31}}C\)
B.\( - 1,{6.10^{ - 19}}C\)
C.\(1,{6.10^{ - 19}}C\)
D.\( - 1,{9.10^{ - 31}}C\)

A.
B.
C.
D.