/31 Applied Mechanics Civil Engineering Exam Preparation "Applied Mechanics" Subject Questions- Answers. 1 / 31 The resultant of two forces acting at a point is maximum when angle between them,Θ is (a) 0° (b) 45° (c) 90° (d) 180° 2 / 31 Force is a (a) Scalar quantity (b) Vector quantity (c) linear quantity (d) Non-measurable quantity. 3 / 31 If a number of forces are acting at a point, the angle of resultant with horizontal will be (a) (ΣH)² + (ΣV)² (b) √((ΣH)² + (ΣV)²) (c) (ΣH)² + (ΣV)² + 2(ΣV)(ΣH) (d) √((ΣH)² + (ΣV)² + 2(ΣV)(ΣH)) 4 / 31 Two forces of equal magnitude P act at an angle θ to each other. Their resultant is equal to (a) 2P sin(θ/2) (b) 2P cos(θ/2) (c) 2P cos θ (d) 2P cos 2θ 5 / 31 If resultant of two equal forces is equal to either of them, then angle between them is (a) 30° (b) 60° (c) 90° (d) 120° 6 / 31 The concurrent forces P and Q (P > Q) acting along the same straight line, but in opposite direction, their resultant will be equal to (a) P + Q (b) P - Q (c) P/Q (d) Q/P 7 / 31 If a number of forces are acting at a point, their resultant is given by (a) (ΣH)² + (ΣV)² (b) √((ΣH)² + (ΣV)²) (c) (ΣH)² + (ΣV)² + 2(ΣV)(ΣH) (d) √((ΣH)² + (ΣV)² + 2(ΣV)(ΣH)) 8 / 31 1 kgf = N (a) 8.91 (b) 10 (c) 9.81 (d) 12 9 / 31 The unit of force in S.I. system is (a) Kilogram (b) Newton (c) Dyne (d) Watts 10 / 31 The component of a force (P) at right angles to its direction will be (a) Zero (b) P (c) P/2 (d) 2P 11 / 31 A force which can produce an acceleration of 1 m/s² in a mass of 1 kg is called (a) 1 N (b) 1 kgf (c) 1 dyne (d) 1 watt 12 / 31 A smooth sphere lying on a ______ is in neutral equilibrium. (a) Convex surface (b) Concave surface (c) horizontal surface (d) inclined surface 13 / 31 If a number of forces are acting at a point, the angle of resultant with horizontal will be (a) tan θ = Σ V / Σ H ΣV/ΣH (b) tan θ = Σ H / Σ V ΣH/ΣV (c) tan θ = Σ V × Σ H ΣV×ΣH (d) tan θ = ( Σ V ) × ( Σ H ) (ΣV)×(ΣH) 14 / 31 The necessary condition of equilibrium of a body is (a) Σ H = 0 ΣH=0 (b) Σ V = 0 ΣV=0 (c) Σ M = 0 ΣM=0 (d) Σ H = 0 , Σ V = 0 , Σ M = 0 ΣH=0,ΣV=0,ΣM=0 15 / 31 The resultant of two forces P and Q acting at an angle Θ is √(P²+Q²-2PQ sinΘ) √(P²+Q²+2PQ sinΘ) √(P²+Q²+2PQ cosΘ) √(P²+Q²-2PQ cosΘ) 16 / 31 In S.I. units, the unit of moment is (a) kg.m (b) N-m (c) N-m/sec (d) kgf 17 / 31 The forces whose line of action lie on the same line are known as (a) Concurrent forces. (b) Coplanar forces. (c) Equilibrium forces. (d) Collinear forces. 18 / 31 When two forces each equal to P act at 90° to each other, then their resultant will be (a) √(2) P (b) 2P (c) 0.707 P (d) zero 19 / 31 Which is not a vector quantity ? (a) Weight (b) Velocity (c) Momentum (d) Distance 20 / 31 Four forces P, 2P, 3P and 4P act along the sides taken in order of a square. The resultant force is (a) zero (b) 2√2 P (c) 2P (d) √5 P 21 / 31 When two equal unlike parallel forces cause rotary motion of a body then this force system is called as (a) Moment of force. (b) Couple. (c) Principle of moments. (d) Parallel force system. 22 / 31 1 MN =............. N? 10^12 (b) 10^9 (c) 10^6 (d) 10^3 23 / 31 Two forces of 6 kN and 8 kN act at right angles to each other, the resultant force will be (a) 10 kN (b) 14 kN (c) 28 kN (d) 100 kN 24 / 31 A smooth cylinder lying on convex surface remains in ______ equilibrium. (a) unstable (b) stable (c) neutral (d) any of the above 25 / 31 If P and Q are the two forces acting at an angle θ and their resultant makes an angle α with P, then (a) tan α = (Q sin θ)/(P + Q cos θ) (b) tan α = (Q sin θ)/(P + Q sin θ) (c) tan α = (Q sin θ)/(Q + P cos θ) (d) tan α = (P sin θ)/(Q + P cos θ) 26 / 31 "If three coplanar forces, acting at a point be in equilibrium, then each force is proportional to the sine of the angle between the other two." It is called (a) Laws of moments. (b) Lami’s theorem. (c) Condition of equilibrium. (d) Varignon’s theorem. 27 / 31 The forces whose line of actions meet at one point are called (a) Coplanar forces. (b) Concurrent forces. (c) Equilibrium forces. (d) Collinear forces. 28 / 31 1 Joule is equal to (a) 1 N-m (b) 9.81 N-m (c) 1 kgf-m (d) None 29 / 31 The resultant of two forces acting at a point is minimum when angle between them,Θ is (a) 0° (b) 45° (c) 90° (d) 180° 30 / 31 The resultant of two equal forces P acting in opposite directions will be (a) 2P (b) (sqrt{P}) (c) 0.707 P (d) zero 31 / 31 The set of forces, whose resultant is zero, are known as (a) Coplanar forces. (b) Concurrent forces. (c) Equilibrium forces. (d) Collinear forces. Your score is 0% Restart quiz