/31 Applied Mechanics Civil Engineering Exam Preparation "Applied Mechanics" Subject Questions- Answers. 1 / 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)) 2 / 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)) 3 / 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. 4 / 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° 5 / 31 1 Joule is equal to (a) 1 N-m (b) 9.81 N-m (c) 1 kgf-m (d) None 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 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. 8 / 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) 9 / 31 1 kgf = N (a) 8.91 (b) 10 (c) 9.81 (d) 12 10 / 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 11 / 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) 12 / 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. 13 / 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° 14 / 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 15 / 31 A smooth sphere lying on a ______ is in neutral equilibrium. (a) Convex surface (b) Concave surface (c) horizontal surface (d) inclined surface 16 / 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. 17 / 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° 18 / 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) 19 / 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 20 / 31 Force is a (a) Scalar quantity (b) Vector quantity (c) linear quantity (d) Non-measurable quantity. 21 / 31 In S.I. units, the unit of moment is (a) kg.m (b) N-m (c) N-m/sec (d) kgf 22 / 31 The set of forces, whose resultant is zero, are known as (a) Coplanar forces. (b) Concurrent forces. (c) Equilibrium forces. (d) Collinear forces. 23 / 31 The unit of force in S.I. system is (a) Kilogram (b) Newton (c) Dyne (d) Watts 24 / 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 25 / 31 A smooth cylinder lying on convex surface remains in ______ equilibrium. (a) unstable (b) stable (c) neutral (d) any of the above 26 / 31 1 MN =............. N? 10^12 (b) 10^9 (c) 10^6 (d) 10^3 27 / 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 28 / 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 29 / 31 The component of a force (P) at right angles to its direction will be (a) Zero (b) P (c) P/2 (d) 2P 30 / 31 Which is not a vector quantity ? (a) Weight (b) Velocity (c) Momentum (d) Distance 31 / 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 Your score is 0% Restart quiz