Question: If a rigid body is in equilibrium under the action of three forces, then_______________?

• 1. these forces are equal
• 2. the lines of action of these forces meet in a point
• 3. the lines of action of these forces are parallel
• 4. B and C above

Question: According to principle of moments_________________?

• 1. if a system of coplanar forces is in equilibrium, then their algebraic sum is zero
• 2. if a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
• 3. the algebraic sum of the moments of any two forces about any point is equal to moment of theiwesultant about the same point
• 4. positive and negative couples can be balanced

Question: According to law of triangle of forces______________?

• 1. three forces acting at a point will be in equilibrium
• 2. three forces acting at a point can be represented by a triangle, each side being proportional to force
• 3. if three forces acting upon a patticle are represented in magnitude and direction by the sides of a triangle, taken in order, they will be in equilibrium
• 4. if three forces acting at a point are in equilibrium, each force is proportional to the sine of the angle between the other two

Question: Two non-collinear parallel equal forces acting in opposite direction________________?

• 1. balance each other
• 2. constitute a moment
• 3. constitute a couple
• 4. constitute a moment of couple

Question: The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60° produce resultant of Vl3 kg. These forces are____________________?

• 1. 2 and V6
• 2. 3 and 1 kg
• 3. V5andV5
• 4. 2 and 5

Question: Which of the following is not a scalar quantity__________________?

• 1. time
• 2. mass
• 3. volume
• 4. acceleration

Question: The forces, which meet at one point, but their lines of action do not lie in a plane, are called______________?

• 1. coplanar non-concurrent forces
• 2. non-coplanar concurrent forces
• 3. non-coplanar non-concurrent forces
• 4. intersecting forces

Question: Which of the following is not the unit of pressure ?

• 1. kg/cm
• 2. ata
• 3. atmosphere
• 4. newton

Question: The unit of work or energy in S.I. units is________________?

• 1. newton
• 2. pascal
• 3. kilogram meter
• 4. joule

Question: In the lever of third order, load W, effort P and fulcrum F are oriented as follows_________________?

• 1. W between P and F
• 2. F between W and P
• 3. P between W and F
• 4. W, P and F all on one side