Solve these

Q-1 A swimmer is trying to cross a river. The total time taken by him doesn't depend upon :

(a) viscosity of river water
(b) speed of river water
(c) his speed (w.r.t. river water)
(d) width of the river

Q-2 It is found that only 8% of bulbs from a particular box of bulbs are found to be non- defective. The probability that a bulb picked out from the box is non-defective is:

(a) 2/25
(b) 23/25
(c) 4/25
(d) 3/25

Q-3 Two masses 'm' and '2m' are connected to each other by a rope which goes through a pulley such that one mass is on both sides of the pulley.Each mass ,in addition to tension force by rope, is also pulled downwards by a force 'F'.Now the rope is cut from one of the sides.What will be the acceleration of the mass (the rope on whose side is cut) just after the rope is cut.

Q-4 Two vessels with equal volume containing two gases at equal temperature are connected to each other.The resultant pressure in the connected vessel will be:

(a) p₁ + p₂
(b) p₁ + p₂2
(c) (p₁p₂)^¹²
(d) none of these
[ p₁,p₂ are initial pressures in two vessels)