(a) 50 J (b) 40 J (c) 20 J (d) 10 J Answer:d (5)
(a) The centre of the system (b) The centre of mass of the system (c) Any point on the system (d) Any point on the system or outside it Ans. d (16)
(a) 12 N, 6 N (b) 13 N, 5N (c) 10 N, 8 N (d) 16 N, 2 N Ans. b (5)
(a) F1 3N, F2 = 5N, F3 = 9N (b) F1 3N, F2 = 5N, F3 = 9N (c) F1 3N, F2 = 5N, F3 = 9N (d) F1 3N, F2 = 5N, F3 = 6N Ans. d (18)
(a) 20 ergs (b) 60 ergs (c) 70 ergs (d) 700 ergs Answer: a (9)
(a) 0.1 kg/cm (b) 5 kg/cm (c) 0.3 kg/cm (d) 1 kg/cm Answer: a (7)
(a) Purely linear motion (b) Purely rotational motion (c) Linear and rotational motion (d) No motion Ans. b (7)
(a) 12 N (b) 8 N (c) 4 N (d) 5 N Ans. c (12)
(a) North-East (b) South (c) South-West (d) West Ans. c (35)
(a) -2π newton×second (b) Zero newton×second (c) +4π newton×second (d) -6π newton×second Answer: b (10)
(a) Vertical component of the thrust created by air currents striking the lower surface of the wings (b) Force due to reaction of gases ejected by the revolving propeller (c) Upthrust of the air which will be equal to the …
(a) There is no force acting on it (b) The force acting on it is not in contact with it (c) The combination of forces acting on it balances each other (d) The body is in vacuum Ans . c …
(a) 8×10-2 joules (b) 16×10-2 joules (c) 4 ×10-4 joules (d) 1.6 ×10-3 joules Answer: A (21)
(a) 45° (b) 120° (c) 150° (d) 60° Ans . b (8)
(a) 50 J (b) 25 J (c) 287.5 J (d) 200 J Answer:c (15)
(a) c0s -1 (-17/18) (b) cos -1 (-1/3) (c) cos -1 (2/3) (d) cos (8/9) Ans. a (61)
(a) r vector X T vector=0 and F vector X T vector =0 (b) r vector X T vector = 0 and F vector x T vector not equal to Zero (c) r vector X T vector not equal to …
(a) ymax=20m (b) ymax= 15m (c) ymax= 11m (d) ymax = 5m Answer: C (14)
(a) Conservation of mass (b) Conservation of energy (c) Conservation of linear momentum (d) Conservation of angular momentum Ans. c (13)
(a) (a-b)a/2 (b) a2/2b (c) a2-b2/2b (d) a2-b2/2a Ans. b (11)
a) It is lighter than air (b) Of gravitational pull of the sun (c) It has a fan which displaces more air per unit time than the weight of the rocket (d) Of the force exerted on the rocket by …
(a) 0.05 m/s (b) 5 m/s (c) 50 m/s (d) 500 m/s Ans. d (3)
(a) The particles on the surface of the sphere do not have any linear acceleration (b) The particles on the diameter mentioned above do not have any linear acceleration (c) Different particles on the surface have different angular speeds (d) …
(a) 0.2 m/sec (b) 0.1 m/sec (c) 0.5 m/sec (d) 0.05 m/sec Ans. a (11)
(a) 1 rad/sec (b) 7 rad/sec (c) 5 rad/sec (d) √12 rad/sec Ans. c (561)
(a) 9 Ns (b) Zero (c) 0.9 Ns (d) 1.8 Ns ans. c (23)
(a) 5 ms -1 (b) 25ms -1 (c) 0.5 ms -1 (d) 0.25 ms -1 ans. …
(a) 0.5 rad/sec2 at the end of 10 sec (b) 0.3 rad/sec2 at the end of 2 sec (c) 0.05 rad/sec2 at the end of 1 sec (d) Constant 0.05 rad/sec2 Ans. d (25)
(a) The last block starts moving at t=(n-1)L/v (b) The last block starts moving at t=n(n-1)L/2v (c) The centre of mass of the system will have a final speed v (d) The centre of mass of the system will have …
(a) Both P and Q move forward with speed v/2 (b) Both P and Q move forward with speed v/√2 (c) P comes to rest and Q moves forward with speed v (d) P and Q move in opposite directions …
(a) 1 : 1 (b) 2 : 1 (c) 4 : 1 (d) 9 : 1 Answer: d (6)
(a) 45° (b) 90° (c) 135° (d) 180° Answer:b (8)
(a) Zero (b) (m1+m2)gt0 (c) 2(m1+m2)gt0 (d) 1/2(m1+m2)gt0 Answer: c (12)