NEET 2017 | NEET Year Wise Previous Years Questions

Preeti reached the metro station and found that the escalator was not working. She walked up the sationary escalator in time t₁. On another days, if she remains stationary on the the moving escalator, then the escalator takes her up in time t₂. The time taken by her to walk up on the moving escalator will be

$${{{t_1}{t_2}} \over {{t_2} - {t_1}}}$$

$${{{t_1}{t_2}} \over {{t_2} + {t_1}}}$$

$${{t_1} - {t_2}}$$

$${{{t_1} + {t_2}} \over 2}$$

NEET 2017

MCQ (Single Correct Answer)

-1

The x and y coordinates of the particle at any time are x = 5t $$-$$ 2t² and y = 10t respectively, where x and y are in metres and t in seconds. The acceleration of the particle at t = 2 s is

5 m s^$$-$$2

$$-$$4 m s^$$-$$2

$$-$$8 m s^$$-$$2

NEET 2017

MCQ (Single Correct Answer)

-1

One end of string of length $$l$$ is connected to a particle of mass 'm' and the other end is connected to a small peg on a smooth horizontal table. If the particle moves in circle with speed '$$\upsilon $$', the net force on the particle (directed towards centre) will be (T represents the tension in the string)

$$T + {{m{v^2}} \over l}$$

$$T - {{m{v^2}} \over l}$$

zero

$$T$$

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