Practice Test: Question Set - 11
1. A composite member shown in below figure was formed at 25°C and was made of two materials a and b. If the coefficient of thermal expansion of a is more than that of b and the composite member is heated up to 45°C, then
- (A) a will
be in tension and b in compression
- (B) Both will be
in compression
- (C) Both will be
in tension
- (D) a will
be in compression and b in tension
2. Coulomb friction is the friction between
- (A) Bodies having relative motion
- (B) Two dry surfaces
- (C) Two lubricated surfaces
- (D) Solids and liquids
3. The ratio of the moment of inertia of a circular plate and that of a square plate for equal depth, is
- (A) Less than
one
- (B) Equal to one
- (C) More than
one
- (D) Equal to
3π/16
4. The principal stresses at a point are 100, 100 and -200 kgf/cm2, the octahedral shear stress at the point is:
- (A) 100 √2 kg/cm2
- (B) 200 √2 kg/cm2
- (C) 300 √2 kg/cm2
- (D) 400 √2 kg/cm2
5. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
- (A) Density of metal can't be determined
- (B) Metal is twice as dense as water
- (C) Metal will float in water
- (D) Metal is twice as dense as unknown fluid
6. The energy stored in a beam of length ‘L’ subjected to a constant B.M. is
- (A) M2L/2EI
- (B) ML2/2EI
- (C) M2L/EI
- (D) ML2/EI
7. In a simply supported beam L with a triangular load W varying from zero at one end to the maximum value at the other end, the maximum bending moment is
- (A) WL/3
- (B) WL/9 √3
- (C) WL/4
- (D) WL3/9 √3
8. Which is the correct statement about law of polygon of forces?
- (A) If any number of forces acting at a point
can be represented by the sides of a polygon taken in order, then the forces
are in equilibrium
- (B) If any number of forces acting at a point
can be represented in direction and magnitude by the sides of a polygon, then
the forces are in equilibrium
- (C) If a polygon representing forces acting at a point
is closed then forces are in equilibrium
- (D) If any number of forces acting at a point can be
represented in direction and magnitude by the sides of a polygon taken in
order, then the forces are in equilibrium
9. If a member carries a tensile force P on its area of cross-section A, the normal stress introduced on an inclined plane making an angle θ with its transverse plane, is
- (A) (P/A)
sin2θ
- (B) (P/A)
cos2θ
- (C) (P/A)
tan2θ
- (D) (P/2A)
sin2θ
10. Failure of riveted joints is due to
- (A) Tearing
of the plates between the rivet hole and the edge of the plate
- (B) Tearing of
plates between rivets
- (C) Shearing of
rivets
- (D) All the
above
11. Two non-collinear parallel equal forces acting in opposite direction
- (A) Balance each other
- (B) Constitute a moment
- (C) Constitute a couple
- (D) Constitute a moment of couple
12. A simply supported wooden beam 150 cm long and having a cross section 16 cm × 24 cm carries a concentrated load, at the centre. If the permissible stress ft = 75 kg/cm2 and fs= 10 kg/cm2 the safe load is
- (A) 3025 kg
- (B) 3050 kg
- (C) 3075 kg
- (D) 3100 kg
13. If a steel rod of 20 mm diameter and 5 metres long elongates by 2.275 mm when subjected to an axial pull of 3000 kg, the stress developed, is
- (A) 9.5541 kg/cm2
- (B) 95.541 kg/cm2
- (C) 955.41 kg/cm2
- (D) 9554.1 kg/cm2
14. Least force required to draw a body up the inclined plane is W sin (plane inclination + friction angle) applied in the direction
- (A) Along the plane
- (B) Horizontally
- (C) Vertically
- (D) At an angle equal to the angle of friction
to the inclined plane
15. If a constant section beam is subjected to a uniform bending moment throughout, its length bends to
- (A) A circular
arc
- (B) A parabolic
arc
- (C) A
catenary
- (D) None of
these
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