40 bài tập trắc nghiệm mặt nón mức độ nhận biết

A \(\dfrac{1}{3}\pi {r^2}h\).    

B \(\pi {r^2}h\).

C \(2\pi {r^2}h\).

D \(\dfrac{1}{3}\pi r{h^2}\).

A \({S_{xq}} = \dfrac{1}{3}\pi {R^2}h\)

B \({S_{xq}} = \pi R\sqrt {{R^2} + {h^2}} \)

C \({S_{xq}} = \pi R\sqrt {{R^2} - {h^2}} \)

D \({S_{xq}} = \pi Rh\)

A \({R^2} = {l^2} + {h^2}\)

B \(l = \sqrt {{R^2} + {h^2}} \)

C \(l = \sqrt {{R^2} - {h^2}} \)

D \(h = \sqrt {{R^2} - {l^2}} \)

A \(\sqrt {39} \pi \)

B \(4\sqrt 3 \pi \)

C \(12\pi \)

D \(8\sqrt 3 \pi \)

A \({S_{xq}} = \pi rl\)

B \({S_{xq}} = 2\pi rh\)

C \({S_{xq}} = 2\pi {r^3}h\)

D \({S_{xq}} = \pi rh\)

A \(20\pi \)

B \(10\pi \)

C \(15\pi \)

D \(30\pi \)

A Mặt trụ

B Mặt phẳng

C Mặt cầu

D Mặt nón

A \(\dfrac{1}{{12}}\pi {a^2}h\)

B \(\dfrac{1}{6}\pi {a^2}h\)        

C \(\dfrac{1}{4}\pi {a^2}h\)

D \(\dfrac{1}{3}\pi {a^2}h\)

A \(2\pi {a^2}\)

B \(8\pi {a^2}\)

C \(4\pi {a^2}\)

D \(\dfrac{2}{3}\pi {a^2}\)

A \(\dfrac{{4\pi {a^2}}}{{\sin \alpha }}\)

B \(\dfrac{{2\pi {a^2}}}{{\sin \alpha }}\)

C \(\dfrac{{\pi {a^2}}}{{\sin \alpha }}\)

D \(\dfrac{{\pi {a^2}}}{{3\sin \alpha }}\)

A \(2\pi \)

B \(4\pi \)

C \(\pi \)

D \(\sqrt 3 \pi \)

A \(5cm\)

B \(\sqrt 7 cm\)

C \(12cm\)

D \(7cm\)

A \(3a\)

B \(2a\)

C \(6a\)

D \(\sqrt 6 a\)

A \(\frac{1}{3}\pi b{c^2}.\)

B \(\frac{1}{3}b{c^2}.\)   

C \(\frac{1}{3}{b^2}c.\)

D \(\frac{1}{3}\pi {b^2}c.\)

A \({S_{xq}} = 2\pi {a^2}.\)

B \({S_{xq}} = \pi {a^2}.\)

C \({S_{xq}} = \pi \sqrt 2 {a^2}.\)

D \({S_{xq}} = \sqrt 2 {\pi ^2}a.\)

A \(\pi {a^3}.\)

B \(3\pi {a^3}.\)

C \(27\pi {a^3}.\)

D \(9\pi {a^3}.\)

A \(\frac{{4\pi \sqrt 3 }}{3}\)

B \(8\pi \sqrt 3 \)

C \(\frac{{2\pi \sqrt 3 }}{3}\)

D \(\frac{{4\pi \sqrt 3 }}{2}\)

A \(6\pi {a^2}.\)

B \(9\pi {a^2}.\)  

C \(36\pi {a^2}.\)  

D \(18\pi {a^2}.\)

A \(V = 5\pi \)

B \(V = 45\pi \)

C \(V = 16\pi \sqrt 3 \)

D \(V = 15\pi \)

A \(2250\pi \left( {c{m^3}} \right).\)                          

B \(750\pi \left( {c{m^3}} \right).\)

C \(2250\left( {c{m^3}} \right).\)                            

D \(750\left( {c{m^3}} \right).\)

A \({30^0}.\)                        

B \({60^0}.\)                          

C \({90^0}.\)

D \({120^0}.\)

A \(5a\)

B \(3\sqrt 2 a\)

C \(3a\)

D \(a\sqrt 5 \)

A \(a\sqrt 5 \)

B \(3a\sqrt 2 \)

C \(3a\)

D \(5a\)

A \(V = 12\pi {a^3}.\)

B \(V = 6\pi {a^3}.\)

C \(V = 24\pi {a^3}.\)

D \(V = 36\pi {a^3}.\)

A Quay một tam giác cân quanh trục đối xứng của nó.

B Quay một tam giác đều quanh một cạnh của nó.

C

Quay hình chữ nhật \(ABCD\) xung quanh trục là cạnh \(AB\).

D Quay tam giác \(ABC\) vuông tại \(B\) xung quanh trục là cạnh \(AC\).

A \(\dfrac{{200}}{3}\pi \)

B \(50\pi \)

C \(\dfrac{{50}}{3}\pi \)

D \(25\pi \)

A \(8{a^2}\)

B \({a^2}\)

C \(2{a^2}\)

D \(4{a^2}\)

A \(V = 12\pi .\)

B \(V = 4\pi .\)

C \(V = 12.\)

D \(V = 4.\)

A \(\dfrac{{\pi {a^3}\sqrt 3 }}{{16}}\)

B \(\dfrac{{\pi {a^3}\sqrt 3 }}{{48}}\)

C \(\dfrac{{\pi {a^3}\sqrt 3 }}{{24}}\)

D \(\dfrac{{\pi {a^3}\sqrt 3 }}{8}\)

A 4

B 3

C 6

D 5

A \(S = \pi rh\).                         

B \(S = \pi {r^2}\).                    

C  \(S = \pi hl\).                         

D \(S = \pi rl\).

A \(2\pi {a^2}\)

B \(3\pi {a^2}\)

C \(4\pi {a^2}\)

D

\(2{a^2}\)

A

  \(2\pi {a^2}.\)                   

B

  \(\pi {a^2}.\)                     

C

  \(\dfrac{3}{4}\pi {a^2}.\) 

D   \(\dfrac{1}{2}\pi {a^2}.\)

A mặt trụ

B mặt nón

C hình trụ

D hình nón

A \(20c{m^2}\)

B \(40c{m^2}\)

C \(40\pi \,\,c{m^2}\)

D \(20\pi \,\,c{m^2}\)

A \(20\pi {a^2}.\)

B \(12\pi {a^2}.\)            

C \(24\pi {a^2}\)

D \(40\pi {a^2}.\)

A  \(V = \pi {a^3}\)                      

B \(V = \dfrac{{\pi {a^3}}}{3}\)                                          

C \(V = 3\pi {a^3}\)                     

D \(V = \dfrac{{\pi {a^3}\sqrt 3 }}{3}\)

A  \(16\pi \left( {c{m^2}} \right)\).                                

B  \(4\pi \left( {c{m^2}} \right)\).                                  

.

C  \(\frac{4}{3}\pi \left( {c{m^2}} \right)\).                              

D  \(4\pi \left( {c{m^2}} \right)\)