jee-main 2005 Q12

jee-main · India Motion on a slope
A block is kept on a frictionless inclined surface with angle of inclination $\alpha$. The incline is given an acceleration a to keep the block stationary. Then a is equal to
(1) $g/\tan\alpha$
(2) $g\operatorname{cosec}\alpha$
(3) g
(4) $g\tan\alpha$ 
A block is kept on a frictionless inclined surface with angle of inclination $\alpha$. The incline is given an acceleration a to keep the block stationary. Then a is equal to\\
(1) $g/\tan\alpha$\\
(2) $g\operatorname{cosec}\alpha$\\
(3) g\\
(4) $g\tan\alpha$
Paper Questions
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