Practice Test: Question Set - 09
1. A closely coiled helical spring of radius R, contains n turns and is subjected to an axial load W. If the radius of the coil wire is r and modulus of rigidity of the coil material is C, the deflection of the coil is
- (A) WR3n/Cr4
- (B) 2WR3n/Cr4
- (C) 3WR3n/Cr4
- (D) 4WR3n/Cr4
2. In the lever of third order, load W, effort P and fulcrum F are oriented as follows
- (A) W between P and F
- (B) F between W and P
- (C) P between W and F
- (D) W, P and F all on one side
3. In the cantilever truss as shown in below figure, the horizontal component of the reaction at A, is
- (A) 30
tonnes
- (B) 60
tonnes
- (C) 90
tonnes
- (D) 120 tonnes
4. The property by which a body returns to its original shape after removal of the force, is called
- (A) Plasticity
- (B) Elasticity
- (C) Ductility
- (D) Malleability
5. Forces are called coplanar when all of them acting on body lie in
- (A) One point
- (B) One plane
- (C) Different planes
- (D) Perpendicular planes
6. The slenderness ratio of a vertical column of a square cross-section of 2.5 cm sides and 300 cm length, is
- (A) 200
- (B) 240
- (C) 360
- (D) 416
7. The stress necessary to initiate yielding, is considerably
- (A) More than
that necessary to continue it
- (B) Less than
that necessary to continue it
- (C) More than
that necessary to stop it
- (D) Less
than that necessary to stop it
8. Which of the following is not a scalar quantity?
- (A) Time
- (B) Mass
- (C) Volume
- (D) Acceleration
9. Influence lines are drawn for structures
- (A) Of any type
- (B) Statically
determinate
- (C) Pin-jointed
truss
- (D) None of
these
10. A cast iron T section beam is subjected to pure bending. For maximum compressive stress to be three times the maximum tensile stress, centre of gravity of the section from flange side is
- (A) h/4
- (B) h/3
- (C) h/2
- (D) 2/3 h
11. The units of moment of inertia of an area are
- (A) kg m2
- (B) m4
- (C) kg/m2
- (D) m3
12. The radius of gyration of a rectangular section is not proportional to
- (A) Square root
of the moment of inertia
- (B) Square root
of the inverse of the area
- (C) Square root
of the moment of inertia divided by area of the section
- (D) None of
these
13. Ties are load carrying members of a frame, which are subjected to
- (A) Transverse loads
- (B) Axial
tension loads
- (C) Axial
compressive loads
- (D) Torsional
loads
14. On the ladder resting on the ground and leaning against a smooth vertical wall, the force of friction will be
- (A) Downwards at its upper end
- (B) Upwards at its upper end
- (C) Perpendicular to the wall at its upper end
- (D) Zero at its upper end
15. The phenomenon of slow extension of materials having constant load, i.e. increasing with the time is called
- (A) Creeping
- (B) Yielding
- (C) Breaking
- (D) None of
these