lative lume if the ty of nis on is an is 2 2 an fic T ere he ass ter K e a 6 5 28 A stone is thrown horizontally with velocity The velocity of the stone 0 5 s later is 3u 2 The K value of u is a 2 2 ms c 4 4 ms 29 The dimension of the quantity mtG Objective NCERT b 5 6 d 4 5 a M L T A c ML T A2 b 3 3 mg d 1 1 ms 1e to he electron Planck s constant and c velocity of light b MOLTA d M L TA a 4 1 c 3 1 is e chargest 30 A projectile is thrown with an initial velocity a b ms where and are the unit vecton along horizontal and vertical directions respectively If the range of projectile is twice the maximum height reached by it then a b 2 c b 2a b b a d b 4a 31 A uniform wire of length 20 m and weighing 5 kg hangs vertically If g 10 ms2 then the speed of transverse waves in the middle of the wire is a 10 m 5 c 4 m s b 10 2 ms d 2 ms 32 The velocity of a body moving in a vertical circle of radius r is 7gr at the lowest point of the circle What is the ratio of maximum and minimum tension b 7 1 d 2 1 33 Figure shows position and velocities of two particles moving under mutual gravitational attraction in space at time t 0 YA 2 kg 8ms 2ms 13 kg r 2m x 12 m The position of centre of mass after one second is a x 4m b x 6 m c x 8m d x 10 m 34 How large must Fbe in the figure shown to give the 700 g block an acceleration of 30 cm s The coeff icient of friction between all surfaces is 0 15 Poctice Paper 2 a 2 18 N c 4N The radii of two columns in a U tube are r and r When a liquid of density p angle of contact is 0 is filled in it the level difference of liquid in two arms ish The surface tension of liquid is g acceleration due to gravity pghr 2 1 1 2 5 pghr c cos c 36 The angle subtended by the vector 41 3 12k with the x axis is a sin b sin c PV c T RT 200 g 20 T 700 g b 3 18 N d 6 N 37 A solid cylinder rolls without slipping down a 30 slope The minimum coefficient of friction needed to prevent slipping will be a 0 192 c 0 15 b 0 18 d 0 2 RT S b 38 The equation of state for 5 g of oxygen at a pressure P and temperature T when occupying a volume V will be a PV S d pgh 27 72 pgh 2 7 7 d cos 3 b PV 5RT d PV 39 A weightless spring of length 60 cm and force constant 100 N m is kept straight and unstretched on a smooth horizontal table and its ends are rigidly fixed A mass of 0 25 kg is attached at the middle of the spring and is slightly displaced along the length The time period of the oscillation of the mass is a b d 16 RT 10 40 A T m 05 41 T 200 an ta 47