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MCQ
21881. The angles between two forces when the resultant is maximum & minimum respectively are-
0° & 180°
180° & 0°
90° & 180°
90° & 0°
21882. The resultant of two forces P & Q is R. If Q is doubled, the new resultant is perpendicular to P. Then-
P=Q
Q=R
Q=2R
none of these
21883. 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.
21884. 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
21885. 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
21886. The energy stored in a body when strained within elastic limit is known as- [MES-18]
resilience
strain energy
impact energy
proof resilience
21887. Hook's law holds good up to ----[BADC 18]
elastic limit
breaking point
plastic limit
yeild point
none
21888. The terms 'leverage' & 'mechanical advantage' of a compound lever have got same meaning-----
Right
Wrong
21889. 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%
21890. A force while acting on a body may-
Change its motion
Balance the force
Internal stress rise
All of this
21891. The process of finding out the resultant force is called -----of force.
Composition
Resolution
21892. 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).
21893. The term 'force' may be defined as an agent which produces or tends to produce, destroys or tends to destroy motion.
Agree
Disagree
21894. Two forces are acting at an angle of 120°. The bigger force is 40N and the resultant is perpendicular to the smaller one. The smaller force is-
20N
40N
80N
none of this
21895. 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
21896. If the resultant of a number of forces acting on a body is 0. Then the body will be equilibrium........
Yes
No
21897. 1kg force is equal to-
7.8N
12N
8.91 N
9.81N
21898. 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.
21899. 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
21900. 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.