MEC 107 MCQ 3

Mechanics Pratice paper 3

 21)   Which axial force is determined while analyzing a truss? 


a. compressive force
b. tensile force
c. both a. and b.
d. none of the above
ANSWER: both a. and b.

22)   If a body is subjected to plastic impact, _______

a. only kinetic energy is conserved
b. only momentum is conserved
c. both a. and b.
d. none of the above

23)   An object of 30 kg is moved with a velocity of 2 m/s on a horizontal smooth surface. What is the velocity of the block for 4 seconds if force of 40 N is applied on it in the direction of force?


a. 2 m/s
b. 4.6 m/s
c. 7.33 m/s
d. 9.33 m/s
ANSWER: 7.33 m/s

24)   If two objects of 30 kg and 10 kg move with equal kinetic energy, then what is the ratio of magnitudes for linear momentum? 


a. √3 : 1
b. 1 : √3
c. 1 : 3√3
d. 1 : 3
ANSWER: √3 : 1

25)   The total momentum of a system __________, if no external impressed force acts on it.


a. increases
b. decreases
c. remains constant
d. none of the above
ANSWER: remains constant

26)   According to the principle of conservation of energy, under the action of _________ force, the sum of P.E and K.E of a particle remains constant.


a. conservative force
b. dissipative force
c. frictional force
d. air resistance force
ANSWER: conservative force

27)   Work done by an engine in 6 sec is 1000 joules. What is the power generated by the engine in watt? 


a. 1600 watt
b. 600 watt
c. 166 watt
d. 600 watt
ANSWER: 166 watt

28)   If a particle of mass 5 kg moves uniformly along a circle of radius 10 m at 10 m/s, then what is the work done by centripetal force during its one revolution?

a. 0.5 kNm
b. zero
c. infinity
d. none of the above
ANSWER: zero

29)   A block is displaced by 3 m when a force of 200 N is applied on it on an inclined surface which is at an angle of 50o with the horizontal. What is the work done? 

a. 385.67 Nm
b. 459.62 Nm
c. 933.00 Nm
d. Insufficient data
ANSWER: 385.67 Nm

30)   What is the momentum of a body of 2 kg at its highest point, when thrown with a velocity of 15 m/s at an angle of of 70o with the horizontal?

a. 9.23 kg ms-1
b. 10.26 kg ms-1
c. 28.19 kg ms-1
d. None of the above
ANSWER: 10.26 kg ms-1


<< Previous                                                           Next >>


Comments

Post a Comment

Popular posts from this blog

MEC 107 MCQ 1

Image
  Mechanics Practice set paper 1 1)   Forces passing through a common point are known as _____  a.  collinear forces b.  co-planer forces c.  concurrent forces  d.  none of the above 2)   Varignon's theorem is used to find ________ a.  direction of resultant force b.  location of resultant force  c.  magnitude of resultant force d.  nature of resultant force 3)   Couple is formed due to two ______ a.  like, parallel and non-collinear forces of same magnitude b.  like, perpendicular and collinear forces of different magnitude c.  unlike, parallel and non-collinear forces of same magnitude  d.  unlike, perpendicular and non-collinear forces of different magnitude 4)   Which of the following laminas do not have centroid at its geometrical centre? a.  Circle b.  Equilateral triangle c.  Right angled triangle  d.  None of the above 5)   If a material has no uniform density throughout the body, then the position of centroid
Read more

MEC 107 MCQ 7

Image
Mechanics Practice paper 5 41)   Identify the type of truss shown below. a.  Deficient truss  b.  Perfect truss c.  Redundant truss d.  All of the above 42)   Which of the following statements is false about frame/truss? a.  Bent member is never used in a truss b.  Internal hinges are used to connect members in a truss  c.  All members in the truss are two force members d.  Multiforce members can be used in a frame 43)   Which motion has magnitude of static frictional force directly proportional to normal reaction? a.  Actual motion b.  Impending motion  c.  Both a. and b. d.  None of the above 44)   Which formula is used to calculate angle of static friction (Φ s )? a.  tan -1  μ s   b.  sin -1  μ s c.  cos -1  μ s d.  none of the above 45)   Frictional force depends on ________ a.  surface area in contact b.  roughness of surface   c.  both a. and b. d.  none of the above 46)   Which of the following conditio
Read more