Image
1.0.0
MCQ
25061. 1kg force is equal to-
7.8N
12N
8.91 N
9.81N
25062. The friction experienced by a body, when at rest, is known as- (BREB-15]
static friction
coefficient of friction
dynamic friction
limiting friction
ব্যাখ্যা: Static friction is the force of friction experienced by a body when it is at rest it is the value of the limiting friction just be fore slipping occurs.
25063. The unit of moment of inertia of an area is-[ IMES-18]
kg.m²
kg/m²
kg.m² s
m^4
ব্যাখ্যা: Moment of intertia, Ad^2= (mxm)x m^2= m^4
25064. The poisson's ratio for steel varies from- [BREB-17; MES-18]
0.22 to 0.27
0.32 to 0.42
0.25 to 0.33
0.31 to 0.34
ব্যাখ্যা: Poisson's ratio values for different materiais. Material Possion's ratio Clay 0.30-0.45 Stainless steel 0.30-0.31 Steel (MS) 0.27-0.30 Castiron 0.21-0.26
25065. The stress developed in the material without any permanent set is called. [MES-18]
elastic limit
breaking point
yield point
ultimate point
ব্যাখ্যা: Elastic limit, maximum stress or force per unit area within a solid material that can arise before the onset of permanent deformation.
25066. The unit of strain is- (BADC-18)
mm
N/mm
N-mm
no unit
None
Strain is defined as "deformation of a solid due to stress. Strain is a dimensionless unit since it is the ratio of two lengths. strain= change in length/original length
25067. The unit of power in S.I. unit is-[MES-18]
horsepower
kg.m
joule
watt
The unit of power is watt. The unit of energy is joule.
25068. An ideal machine is one whose efficiency is- [BREB-15]
between 60 and 70%
between 70 and 80%
between 80 and 90%
100%
ব্যাখ্যা: The machine whose efficiency is 100% and in which friction is totally absent or Zero, is called as ideal machine. = 100%
25069. The process of finding out the resultant force is called -----of force.
Composition
Resolution
25070. A force while acting on a body may-
Change its motion
Balance the force
Internal stress rise
All of this
25071. The ratio of linear stress to linear strain is --[MES-18,BADC-18]
bulk modulus
modulus of rigidity
poisson's ratio
modulus of elasticity
none
25072. The ultimate tensile stress for mild steel is - the ultimate compressive stress. [MES-18]
equal to
more than
less than
none of these
ব্যাখ্যা: The ultimate tensile stress of mild steel is more than the ultimate compressive stress. Young modulus of a wire will be equal to stress for unit strain.
25073. Hook's law holds good up to ----[BADC 18]
elastic limit
breaking point
plastic limit
yeild point
none
25074. The relation between Young's modulus (E) and Bulk modulus (K) is given by- [MES-18]
K=3m-2 /mE
K= mE/3(m-2)
K=3(m-2)/mE
K= mE / 3(m-2)
25075. The energy stored in a body when strained within elastic limit is known as- [MES-18]
resilience
strain energy
impact energy
proof resilience
25076. Which is not a unit of stress? [MES-16]
Pa
N
psi
MPa
Stress is a force that tends to deform the body on which it acts per unit area. It is measured in N/m² and this unit is specifically called pascal (Pa). Unit of stress N/m², Pa, MPa, Psi Unit of force =N (Newton).
25077. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
Agree
Disagree
25078. The resultant of two equal force P making an angle θ, is given by-
2P sinθ/2
2P cosθ/2
2P tanθ/2
2P cot-θ/2
25079. Two parallel sides of a trapezium are a and b, its height is h, its CG from base is at--- [MES-16]
π(a+b)/3h
h/3 (b+2a/b+a)
3/8(b+a /a+2b)
2h/3 b+2a/b+a
25080. Whenever a material is loaded within elastic limit, stress is-strain. [BREB-15]
equal to
directly proportional to
inversely proportional to
None of these
ব্যাখ্যা: Hook's law states that strain is directly proportional to strain produced by the stress when a material is loaded within the elastic limit.