# 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
3Ï€/16

**4. The principal stresses at a point are 100, 100 and -200 kgf/cm**

^{2}, the octahedral shear stress at the point is:- (A) 100 √2 kg/cm

^{2}

- (B) 200 √2 kg/cm

^{2}

- (C) 300 √2 kg/cm

^{2}

- (D) 400 √2 kg/cm

^{2}

**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)

*M*

^{2}

*L*/2

*EI*

- (B)

*ML*

^{2}/2

*EI*

- (C)

*M*

^{2}

*L*/

*EI*

- (D)

*ML*

^{2}/

*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)

*WL*

^{3}/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 Î¸ with its transverse plane, is- (A) (

*P*/

*A*) sin

^{2}Î¸

- (B) (

*P*/

*A*) cos

^{2}Î¸

- (C) (

*P*/

*A*) tan

^{2}Î¸

- (D) (

*P*/2

*A*) sin

^{2}Î¸

**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/cm^{2}and*f*= 10 kg/cm_{s}^{2}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/cm

^{2}

- (B) 95.541 kg/cm

^{2}

- (C) 955.41 kg/cm

^{2}

- (D) 9554.1 kg/cm

^{2}

**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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