gaokao 2022 Q7

gaokao · China · national-B-science 5 marks Vectors: Lines & Planes Coplanarity and Relative Position of Planes

In the cube $ABCD-A_1B_1C_1D_1$, $E, F$ are the midpoints of $AB, BC$ respectively. Then
A. Plane $B_1EF \perp$ plane $BDD_1$
B. Plane $B_1EF \perp$ plane $A_1BD$
C. Plane $B_1EF \parallel$ plane $A_1AC$
D. Plane $B_1EF \parallel$ plane $A_1C_1D$

In the cube $ABCD-A_1B_1C_1D_1$, $E, F$ are the midpoints of $AB, BC$ respectively. Then\\
A. Plane $B_1EF \perp$ plane $BDD_1$\\
B. Plane $B_1EF \perp$ plane $A_1BD$\\
C. Plane $B_1EF \parallel$ plane $A_1AC$\\
D. Plane $B_1EF \parallel$ plane $A_1C_1D$

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