Related InterviewSolutions

• A body is dropped from a height h, after the third rebound it rises to h/2. What is the coefficient the restitution ?(A) (1/2) (B) (1/2)1/2(C) (1/2)1/4 (D) (1/2)6
• If a body of mass 200 g falls from a height 200 m and its total P.E is converted into K.E. at the point of contact of the body with earth surface, then what is the decrease in P.E of the body at the contact ?(A) 200 J(B) 400 J(C) 600 J(D) 900 J
• The kinetic energy acquired by a mass m in travelling a certain distance d, starting from rest, under the action of a constant force is directly proportional to  (A) √m (B) independent of m. (C) 1/√m. (D) m.
• A shell of mass M is moving with a velocity V. it explodes into two parts, and one of the parts of mass m is left stationary. What will be the velocity of the other part.(A) MV/ (M - m)(B) MV/ ( M + m)(C) mV/ (M - m)(D) mV/ (M + m)
• A bullet is fired on a wooden block. Its velocity reduces by 50% on penetrating 30 cm. How long will it penetrate further before coming to east. (A) 30 cm (B) 15 cm (C) 10 cm (D) 5 cm
• An automobile engine of mass M accelerates and a constant power P is applied by the engine The instantaneous speed of the engine will be(A) [Pt/M]1/2. (B) [(2)t/M]1/2.(C) [Pt/2M]1/2.(D) [PT/4M]1/2. 
• A bullet is fired and gets embedded in block kept on table, then if tale is frictionless. (A) Only K.E. is conserved (B) Only momentum is conserved (C) Both are conserved (D) None of these.
• A bomb explodes into two fragments of masses 3 kg and 1 kg. total kinetic energy of the fragments is 6 MJ. What is the ratio of the kinetic energies of smaller mass to the larger mass ? (A) 1/3. (B) 3. (C) 1/9. (D) 9.
• A ball is dropped from height 10. Ball in embedded in sand 1m and stops.(A) Only momentum remains conserved.(B) Only kinetic energy remains conserved. (C) Both momentum and K.E. are conserved.(D) Neither K.E. nor momentum is conserved.
• A ball of mass M moving with velocity ν collides elastically with wall and rebounds .The change in momentum of the ball will be :(A) Zero(B) Mν (C) 2 Mν(D) 4 Mν