# Practice Test: Question Set - 17

**1. A member is balanced at its end by two inclined members carrying equal forces. For equilibrium the angle between the inclined bars must be**

- (A) 3°

- (B) 45°

- (C) 90°

- (D) 120°

**2. When trying to turn a key into a lock, following is applied**

- (A) Coplanar force

- (B) Non-coplanar forces

- (C) Couple

- (D) Moment

**3. A reinforced concrete beam is assumed to be made of**

- (A) Homogeneous
material

- (B) Heterogeneous
material

- (C) Isotropic
material

- (D) None of
these

**4. For a stable frame structure, number of members required, is**

- (A) Three times
the number of joints minus three

- (B) Twice the
number of joints minus three

- (C) Twice the
number of joints minus two

- (D) Twice the
number of joints minus one

**5. The units of moment of inertia of mass are**

- (A) kg m

^{2}

- (B) m

^{4}

- (C) kg/m

^{2}

- (D) kg/m

**6. The reaction at the supports will be vertical to the plane of the support if the frame structure rests on**

- (A) Roller
supports

- (B) Free
supports

- (C) Hinged
supports

- (D) All the
above

**7. If the stress produced by a prismatic bar is equal to the working stress, the area of the cross-section of the prismatic bar, becomes**

- (A) Zero

- (B) Infinite

- (C) Maximum

- (D) Minimum

**8. The center of percussion of the homogeneous rod of length ‘**

*L*’ suspended at the top will be- (A)

*L*/2

- (B)

*L*/3

- (C) 3

*L*/4

- (D) 2

*L*/3

**9. A beam of length**

*L*is pinned at both ends and is subjected to a concentrated bending couple of moment*M*at its centre. The maximum bending moment in the beam is- (A)

*M*

- (B)

*M*/2

- (C)

*M*/3

- (D)

*ML*/2

**10. If**

*b*is the width of a plate joined by diamond riveting of diameter*d*, the efficiency of the joint is given by- (A) (

*b*+

*d*)/

*b*

- (B) (

*b*-

*d*)/

*b*

- (C) (

*d*-

*b*)/

*d*

- (D) (

*b*-

*d*)/

*d*

**11. A projectile is fired at an angle θ**

**to the vertical. Its horizontal range will be maximum when**

**θ**

**is**

- (A) 0°

- (B) 30°

- (C) 45°

- (D) 60°

**12. For a simply supported beam of length ‘**

*L’*, the bending moment ‘*M’*is described as*M*=*a*(*x*-*x*^{3}/*L*^{2}), 0 ≤*x*<*L*; where ‘*a’*is a constant. The shear force will be zero at- (A) The
supports

- (B)

*x*=

*L*/2

- (C)

*x*=

*L*/√3

- (D)

*x*=

*L*/3

**13. A column is said to be of medium size if its slenderness ratio is between**

- (A) 20 and 32

- (B) 32 and 120

- (C) 120 and 160

- (D) 160 and 180

**14. The length of a column, having a uniform circular cross-section of 7.5 cm diameter and whose ends are hinged, is 5 m. If the value of**

*E*for the material is 2100 tonnes/cm^{2}, the permissible maximum crippling load will be- (A) 1.288 tonnes

- (B) 12.88

- (C) 128.8 tonnes

- (D) 288.0

**15. The moment diagram for a cantilever which is subjected to a uniformly distributed load will be a**

- (A) Triangle

- (B) Rectangle

- (C) Parabola

- (D) Cubic
parabola

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