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Test Series – 2(a)

Section - II (PHYSICS)

45 MARKS

Each of the following questions may have MORE THAN ONE correct option(s).

3 Marks will be awarded only if all correct options are chosen and ­­­­­­­-1 will be awarded for every wrong answer.  (NEGATIVE MARKING)

16. A large rectangular box ABCD falls vertically with an acceleration a. A toy gun fixed at A and aimed towards C fires a particle P.

(A) P will hit C if a = g

(B) P will hit the roof BC if a > g

(C) P will hit the wall CD or the floor AD if a < g

(D) May be either (A), (B) or (C), depending on the speed of projection of P

For Q. 17 – 20

A small block of mass m is kept on the inclined surface of a wedge of mass M. The inclined surface of the wedge makes an angle q with the horizontal. The wedge is kept on a frictionless rigid horizontal floor. You can neglect friction between the block and the wedge also.  An external agent applies a horizontal force F on the wedge.

17. The value of the force F so that the wedge remains at rest is F1.

(A) F1is less than mg sin q (B) F1 is less then mg cos q

(C) F1does not depend on M (D) It is not possible to keep the wedge at rest.

18. The value of force F for which m and M don't have any relative motion is F2.

(A) When F = F2, the force with which wedge presses on the floor is less than its value in the case when F = F1

(B) F2 > F1

(C) F2 depends on the mass of wedge M.

(D) The contact force between the block and the wedge is greater than the weight of the block.

 

19. The horizontal external force F is applied to the block minstead of the wedge.

(A) The block can not be kept at rest by the force F

(B) Block will be at rest if F = F3 = mg tan q

(C) Block and the wedge don't have any relative motion for F = F3 = mg tanq

(D) F3 < F2.

20. Assume that m and M have friction between them with the coefficients of static and kinetic friction bring ms and mk respectively. The external force F is applied to the wedge horizontally. For some particular value of force F = F4, there will be no force of friction between the block and the wedge.

(A) F4 = F1(B) F4 = F2 (C) F4 = F3(D) F4depends on ms.

21. A block of weight 9.8 N is placed on a table. The table surface exerts an upward force of 10 N on the block. Assume g = 9.8 m/s2.

(A) The block exerts a force of 10 N on the table

(B) The block exerts a force of 19.8 N on the table

(C) The block exerts a force of 9.8 N on the table

(D) The block has an upward acceleration

 

22. A monkey of mass m kg slides down a light rope attached to a fixed spring balance, with an acceleration a. The reading of the spring balance is W kg. [g = acceleration due to gravity]

(A) The force of friction exerted by the rope on the monkey is m (g – a) N

(B) (B) (D) The tension in the rope is Wg N

 

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