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JEE Advanced Model Paper 8 with solutions for online practice

Paragraph for Questions Nos. 42 to 44

A rectangle ABCD of dimensions r and 2r is folded along diagonal BD such that planesABD and CBD are perpendicular to each other. Let the position of the vertex A remainsunchanged and C1 is the new position of C .

Question : 43

Total: 84

If ∠ABC1 = θ , then cosθ is equal to

1
5
2
5
2
√5
4
5

Validate

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