22 At what temperature RMS velocity of O molecule will be one third of H molecule at 3 C 1 90 K 2 3 C 4 207 C 3 1167 C 23 A body is projected from surface of earth with a velocity 2V where V is the escape velocity The velocity of object when it escapes from gravitational field of earth is 1 2V 2 3V 3 7V 4 11V 24 If a planet is revolving around the sun in circular orbit with force Fay 5 2 where y is radius then square of period is propotional to 1 7 4 3 72 25 If weight of container along with water is W then reading of weighing machine will be 2 h d 2 7 2 4 2 W Weighing Machine 1 W W 3 W W 26 A cubical container is completely filled with water with its top face open to atmosphere If container is accelerated horizontally with 5 m s2 then find the volume of water spills out edge length of container is 5 m 1 125 m 2 100 m 4 31 25 m 3 10 m 27 A plane mirror is fixed at a heighth above the bottom of a beaker containing water refractive index u upto a height d Find the position of the image of the bottom formed by the mirror 2 W W 4 W W 1 h d behind the mirror d behind the mirror 3 d 4 4 d d h 2 28 There is a small air bubble inside a glass sphere u 1 5 of radius 10 cm The bubble is 4 0 cm below the surface and is viewed normally from outside Find the apparent depth of the bubble 1 3 1 cm from the surface Medica IIT 2 2 cm from the surface 3 4 cm from the surface 4 1 cm from the surface 29 What is the value of X for which image of point object O coincides with itself 1 d 1 behind the mirror 1 3 cm 2 4 cm 4 6 cm 3 5 cm 30 A thin lens is made with a material having refractive index u 1 5 Both the sides are convex It is dipped in water u 1 33 It will behave like 1 A convergent lens 2 A divergent lens 3 A rectangular slab 4 A prism 31 The magnetic field at the origin due to a current element Id placed at a position 7 is 3 15 cm Hol dixr 43 behind the mirror undation Holrxdi 4 mg nil f 2mg nil 2 3 32 A square coil of edge length I having n turns carries a current I It is kept on a smooth horizontal plane A uniform magnetic field Bexists in a direction parallel to an edge The total mass of coil is m What should be the minimum value of B for which the coil will start toppling f 12 cm 2 4 Holrxdi 4x H l dixr 4 3 mg 2nll 4mg nll