In a Young's double slit experiment, if the distance between slits is halved and distance from slits to screen is doubled, the fringe width becomes:

The value of lim (x → 0) (sin x - x) / x³ is equal to:

Which of the following compounds gives a positive iodoform test with I₂ and NaOH?

A body of mass 2 kg moving at 10 m/s collides with a stationary body of mass 3 kg. If they stick together, what is their common velocity?