MULTIPLE CHOICE QUESTIONS1. The rate of doing work is known asa. Potential energy b. Power c. Kinetic energy d. None of the above2. The moment of inertia of solid cone of mass m and radius r about its vertical axis isa. 3mr2/10 b. 2mr2/10 c. 3mr2/5 d. 2mr2/53. Coefficient of friction isa. The friction force acting when the body is in motion b. Ratio of limiting friction and normal reactionc. The friction force acting when the body is just about to move d. None of the above4. Which of the following statement is correct?a. The K.E. of a body remains constantb. The K.E. of a body before impact is more than the K.E. of a body after impactc. The K.E. of a body before impact is less than the K.E. of a body after impact5. The maximum frictional force which comes into play, when a body just begins to slide over the surface of the other body, is known asa. Limiting friction b. Static frictionc. Dynamic friction d. None of the above6. The point through which the whole weight of the body acts, irrespective of its position is known asa. Centre of gravity b. Centre of mass c. Moment of Inertia d. None of the above7. The total energy possessed by a system of moving bodiesa. Is constant at every instant b. Varies from point to pointc. Is maximum in the start and minimum at the end d. None of the above8. If two bodies having masses m1 and m2 (m1m2), having equal kinetic energies, the momentum of body having mass m1 is _____the momentum of body having mass m2.a. Equal b. Greater than c. Less than d. None of the above9. Two like parallel forces are acting at a distance of 24 mm apart and their resultant is 20 N. If the line of action of the resultant is 6 mm from any given force, the two forces area. 15 N and 5 N b. 20 N and 5 N c. 15 N and 15 N d. None of the above10. When a person opens a door, he appliesa. Force b. Torque c. Moment d. None of the above11. An elevator weighing 10,000 kgf attains an upward velocity of 4m/s in two seconds with uniform acceleration. The tension in the cable will be approximately.a. 8,000 kgf b. 10,000 kgf c. 12,000 kgf d. 20,000 kgf

12. A ball is projected vertically upwards with a certain velocity. It takes 40 seconds for its upward journey. The time taken for its downward journey isa. 10 s b. 20 s c. 30 s d. 40 s13. A spring of stiffness 100 N/M is stretched initially by 10cm from the undeformed position. The work required to stretch it by another 10 cm is.a. 5 Nm b. 7 Nm c. 10 Nm d. 15 Nm14. A truck weighing 150kN and travelling at 2m/sec impacts with a buffer spring which compresses 1.25 cm per 10kN. The maximum compression of the spring isa. 20.00 cm b. 22.85 cm c. 27.66 cm d. 30.00 cm15. Two forces A and B are acting at an angle . Their resultant R will make an angle a with the force A, such that cos is equal toa. (A+Bsin)/(A2+B2-2ABcos)1/2 b. Bsin/(A2+B2+2ABcos)1/2c. (A+Bcos)/(A2+B2+2ABcos)1/2 d. Bcos)/(A2+B2-2ABcos)1/216. The motion of a particle (distance in metres and time in seconds) is given by the equation s=2t3+3t Starting from t=0, to attain a velocity of 9m/s, the particle will have to travel a distance ofa. 5 m b. 10 m c. 15 m d. 20 m17. The escape velocity from the surface of the earth is approximately equal toa. 9.81 km/s b. 11.2 km/s c. 14.0 km/s d. 22.0 km/s18. The springs of a chest expander are 60 cm long when unstretched. Their stiffness is 10 N/mm. The work done in stretching them to 100 cm isa. 600 Nm b. 800 Nm c. 1000 Nm d. 1600 Nm19. If the momentum of a given particle is doubled, then its kinetic energy will bea. doubled b. quadrupled c. halved d. unaffected20. A bullet is fired vertically upwards from a rifle, with a velocity of 110 m/s, from the top of a 115 m high tower. If g=10m/s2, the velocity with which the bullet will strike the ground isa. 220 m/s b. 175 m/s c. 120 m/s d. 115 m/s