Chapter -1
1. The rate of doing work is known as
a. Potential energy b. Power c. Kinetic energy d. None of the above
2. The moment of inertia of solid cone of mass ‘m’ and radius ‘r’ about its vertical axis is
a. 3mr2/10 b. 2mr2/10 c. 3mr2/5 d. 2mr2/5
3. Coefficient of friction is
a. The friction force acting when the body is in motion b. Ratio of limiting friction and normal reaction
c. The friction force acting when the body is just about to move d. None of the above
4. Which of the following statement is correct?
a. The K.E. of a body remains constant
b. The K.E. of a body before impact is more than the K.E. of a body after impact
c. The K.E. of a body before impact is less than the K.E. of a body after impact
5. The maximum frictional force which comes into play, when a body just begins to slide over the surface of the other body, is known as
a. Limiting friction b. Static friction
c. Dynamic friction d. None of the above
6. The point through which the whole weight of the body acts, irrespective of its position is known as
a. Centre of gravity b. Centre of mass
c. Moment of Inertia d. None of the above
7. The total energy possessed by a system of moving bodies
a. Is constant at every instant b. Varies from point to point
c. Is maximum in the start and minimum at the end d. None of the above
8. If two bodies having masses m1 and m2 (m1˃m2), 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 above
9. 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 are
a. 15 N and 5 N b. 20 N and 5 N
c. 15 N and 15 N d. None of the above
10. When a person opens a door, he applies
a. Force b. Torque c. Moment d. None of the above
11. 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
is
a. 10 s b. 20 s c. 30 s d. 40 s
13. 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 Nm
14. 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 is
a. 20.00 cm b. 22.85 cm c. 27.66 cm d. 30.00 cm
15. Two forces A and B are acting at an angle θ. Their resultant ‘R’ will make an angle a with the force A, such that cosθ is equal to
a. (A+Bsinθ)/(A2+B2-2ABcosθ)1/2 b. Bsinθ/(A2+B2+2ABcosθ)1/2
c. (A+Bcosθ)/(A2+B2+2ABcosθ)1/2 d. Bcosθ)/(A2+B2-2ABcosθ)1/2
16. 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 of
a. 5 m b. 10 m c. 15 m d. 20 m
17. The escape velocity from the surface of the earth is approximately equal to
a. 9.81 km/s b. 11.2 km/s c. 14.0 km/s d. 22.0 km/s
18. 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 is
a. 600 Nm b. 800 Nm c. 1000 Nm d. 1600 Nm
19. If the momentum of a given particle is doubled, then its kinetic energy will be
a. doubled b. quadrupled c. halved d. unaffected
20. 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 is
a. 220 m/s b. 175 m/s c. 120 m/s d. 115 m/s
21. According to principle of conservation of energy, the total momentum of a system of masses in any direction remains constant unless acted upon by an external force in that direction.
a. Truth b. False
22. The friction experienced by a body, when in motion, is known as
A. rolling friction
B. dynamic friction
C. limiting friction
D. static friction
Chapter-2
1. Strain energy is the
A. energy stored in a body when strained within elastic limits
B. energy stored in a body when strained upto the breaking of a specimen
C. maximum strain energy which can be stored in a body
D. proof resilience per unit volume of a material
2. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the
A. axis of load B. perpendicular to the axis of load
C. maximum moment of inertia D. minimum moment of inertia
3.The neutral axis of the cross-section a beam is that axis at which the bending stress is
A. zero B. minimum C. maximum D. infinity
4. Euler's formula holds good only for
A. short columns B. long columns C.both short and long columns D.weak columns
5. The object of caulking in a riveted joint is to make the joint
A.free from corrosion B.stronger in tension
C.free from stresses D.leak-proof
6. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce
A.no stress B.shear stress C.tensile stress D.compressive stress
7. A body is subjected to a tensile stress of 1200 MPa on one plane and another tensile stress of 600 MPa on a plane at right angles to the former. It is also subjected to a shear stress of 400 MPa on the same planes. The maximum normal stress will be
A.400 MPa B.500 MPa C.900 MPa D.1400 MPa
8. Two shafts 'A' and 'B' transmit the same power. The speed of shaft 'A' is 250 r.p.m. and that of shaft 'B' is 300 r.p.m. The shaft 'B' has the greater diameter.
A.True B.False
9. The stress induced in a body, when suddenly loaded, is __________ the stress induced when the same load is applied gradually.
A.equal to B.one-half C.twice D.four times
10. For a beam, as shown in the below figure, the maximum deflection is .
A.True B.False
11. If the slenderness ratio for a column is 100, then it is said to be a __________ column.
A.long B.medium C.short
12. A masonry dam may fail due to
A.tension in the masonry of the dam and its base B.overturning of the dam
C.crushing of masonry at the base of the dam D.any one of the above
13. In order to prevent crushing of masonry at the base of the dam, the maximum stress should be __________ the permissible stress of the soil.
A.equal to B.less than C.more than
14. When a body is subjected to two equal and opposite pushes, as a result of which the body tends to reduce its length, the stress and strain induced is compressive.
A.True B.False
15. The bending moment at a point on a beam is the algebraic __________ of all the moments on either side of the point.
A.sum B.difference
16. The maximum diameter of the hole that can be punched from a plate of maximum shear stress 1/4th of its maximum crushing stress of punch, is equal to (where t = Thickness of the plate)
A.t B.2t C.4t D.8t
17. Two closely coiled helical springs 'A' and 'B' are equal in all respects but the number of turns of spring 'A' is half that of spring 'B' The ratio of deflections in spring 'A' to spring 'B' is
A.1/8 B.1/4 C.1/2 D.2
18. The deformation per unit length is called
A.tensile stress B.compressive stress C.shear stress D.strain