**First Year Engineering Common to all Branches: Engineering Mechanics 6**

Subject: Engineering Mechanics 6

**Part 6: List for questions and answers of Engineering Mechanic**

**Q1. The centre of gravity of a triangle is at the point where three**

a) medians of the triangle meet

b) perpendicular bisectors of the sides of the triangle meet

c) bisectors of the angle of the triangle meet

d) none of these

**Q2. The locus of the instantaneous centre of a moving rigid body, is**

a) straight line

b) involute

c) centroid

d) spiral

**Q3. A projectile is thrown at an angle a to the horizontal with ? velocity v. It will have the maximum centripetal acceleration**

a) at the start

b) at the top of the trajectory

c) as it strikes the ground

d) else where

**Q4. If a body moves in such a way that its velocity increases by equal amount in equal intervals of time, it is said to be moving with**

a) a uniform retardation

b) a uniform acceleration

c) a variable acceleration

d) a variable retardation

**Q5. If the gravitational accelerational at any place is doubled, the weight of a body, will**

a) be reduced to half

b) be doubled

c) not be affected

d) none of these

**Q6. Which one of the following statements is true ?**

a) The tangent of the angle of friction is equal to coefficeint of friction

b) The angle of repose is equal to angle of friction

c) The tangent of the angle of repose is equal to coefficient of friction

d) All the above

**Q7. The product of mass and velocity of a moving a body, is called**

a) moment

b) momentum

c) power

d) impulse

**Q8. Engineer’s units of force, is**

a) Newton in absolute units

b) Dyne in absolute units

c) Newton and dyne in absolute units

d) All the above

**Q9. Joule is the unit of**

a) work

b) force

c) power

d) torque

**Q10. The angle which an inclined surface makes with the horiontal when a body placed on it is on the point of moving down, is called**

a) angle of repose

b) angle of friction

c) angle of inclination

d) none of these

**Q11. Work may be defined as**

a) force x distance

b) force x velocity

c) force x acceleration

d) none of these

**Q12. A satellite moves in its orbit around the earth due to**

a) Gravitational force

b) Centripetal force

c) Centrifugal force

d) none of these

**Q13. The mechanical advantage of an ideal machine is 100. For moving the local through 2 m, the effort moves through**

a) 0.02 m

b) m

c) 2.5 m

d) 20 m

**Q14. To attain the synchronous orbit, the launch of a satellite, is done from a place**

a) on equator

b) on 30° latitude

c) on 45° latitude

d) on 60° latitude

**Q15. The total time of collision and restitution of two bodies, is called**

a) time of collision

b) period of collision

c) period of impact

d) all the above

**Q16. The length of a Second’s pendulum, is**

a) 99.0 cm

b) 99.4 cm

c) 100 cm

d) 101 cm

**Q17. Two forces of 6 Newtons and 8 Newtons which are acting at right angles to each other, will have a resultant of**

a) 5 Newtons

b) 8 Newtons

c) 10 Newtons

d) 12 Newtons

**Q18. Effect of a force on a body depends upon its**

a) direction

b) magnitude

c) position

d) all the above

**Q19. The velocity of a moving body, is**

a) a vector quantity

b) a scalar quantity

c) a scalar as well as a vector quantity

d) none of these

**Q20. Power can be expressed as**

a) work/energy

b) work/time

c) work x time

d) work/distance

**Part 6: List for questions and answers of Engineering Mechanics**

Q1. Answer: a

Q2. Answer: b

Q3. Answer: a

Q4. Answer: c

Q5. Answer: b

Q6. Answer: d

Q7. Answer: b

Q8. Answer: a

Q9. Answer: a

Q10. Answer: a

Q11. Answer: a

Q12. Answer: b

Q13. Answer: a

Q14. Answer: a

Q15. Answer: d

Q16. Answer: b

Q17. Answer: c

Q18. Answer: d

Q19. Answer: a

Q20. Answer: b