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P0IITU06 - Work, Energy and Power qns

P0IITU06 - Work, Energy and Power qns - Q161 A long sprig...

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QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 Q161. A long sprig when stretched by x cm has a potential energy V. on increasing the stretching to nx cm, the potential energy stored in the spring will be (a) v/n (b) nv (c) n 2 v (d) v/n 2 Q162. Two bodies of masses m and 4m are moving with equal kinetic energy. The ratio of their linear momentum is (a) 1 : 4 (b) 4 : 1 (c) 1 : 2 (d) 1 : 1 Q163. Two bodies of masses m and 4m are moving with equal linear momentum. The ratio of their kinetic energies is (a) 1 : 4 (b) 1 : 1 (c) 4 : 1 (d) 1 : 2 Q164. The relationship between the force F and position x of a body is as shown in figure. The work down in displacing the body from x = 1m to x = 5m. will be 1 2 3 4 5 6 O -5 -10 5 10 F(N) x (m) (a) 20 J (b) 15 J (c) 25 J (d) 30 J Q165. Several forces varying both in magnitude and direction are used to move a particle along a smooth curved horizontal path. The work done in the particle by the resultant force equals the change in the (a) total energy of the particle (b) kinetic energy of the particle (c) potential energy of the particle (d) any of the above depending upon the nature of forces and path. Q166. A body of mass m accelerates uniformly from rest to a speed u in a time T. The instantaneous power delivered to the body as a function of time t is given by (a) t T mu 2 1 2 (b) t T mu 2 1 2 2 (c) t T mu 2 2 (d) 2 2 2 t T mu Q167. The gain in potential energy of an object of mass M raised from the surface of the earth to a height equal to the radius R of the earth is (a) MgR/2 (b) MgR (c) 2MgR (d) MgR/4 Q168. Two mass M and 4M are suspended from the ends of two identical springs. Both the masses are stretched down from their mean positions and let go simultaneously. If they are in same phase every four seconds, the springs constant is (a) π N/m (b) π 2 N/m (c) 2 π N/m (d) 2 π 2 N/m Q169. Ten springs of spring constant 1 N/m, ½ N/m, ¼ N/m---- connected in parallel as shown are equivalent to a single spring of spring constant. (a) 45 N/m (b) 511/256 N/m (c) 12.3 N/m (d) 1023/512 N/m m Q170. The force required to stretch a spring varies with distance stretched as shown If the experiment is performed with a spring of half the length, the line OA will (a) shift towards F - axis (b) shift towards X - axis (c) remain unchanged (d) becomes double the length F(N) 2 0.04 x (m) Q171. The period of oscillation of the spring system of spring constant 120 N. m is T. If an other spring of spring constant 240 N/m is connected in series with this spring the time period of the system will become. (a) 3 T (b) 2 / 3 T (c) 3T (d) 3/2 T

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QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 Q172. Two bodies of masses M 1 and M 2 have same kinetic energy. The ratio of their linear momentum is (a) 2 1 M / M (b) 1 2 M / M (c) M 1 /M 2 (d) M 2 /M 1 Q173. Two bodies of unequal masses moving with velocity V 1 and V 2 have same kinetic energy. The ratio of their linear
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P0IITU06 - Work, Energy and Power qns - Q161 A long sprig...

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