Question: Bell metal contains_____________________?

• 1. 70% copper and 30% zinc
• 2. 90% copper and 10% tin
• 3. 85-92% copper and rest tin with little lead and nickel
• 4. 70-75% copper and rest tin

Question: Pick up the wrong statement?

• 1. aluminium in steel results in excessive grain growth
• 2. manganese in steel induces hardness
• 3. nickel and chromium in steel help in raising the elastic limit and improve the resilience and ductility
• 4. tungsten in steels improves magnetic properties and hardenability

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 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 a vector quantity___________________?

• 1. energy
• 2. mass
• 3. momentum
• 4. angle

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: D’ Alembert’s principle is used for______________________?

• 1. reducing the problem of kinetics to equivalent statics problem
• 2. determining stresses in the truss
• 3. stability of floating bodies
• 4. designing safe structures

Question: The product of either force of couple with the arm of the couple is called_________________?

• 1. resultant couple
• 2. moment of the forces
• 3. resulting couple
• 4. moment of the couple

Question: The center of gravity of a uniform lamina lies at____________________?

• 1. the center of heavy portion
• 2. the bottom surface
• 3. the mid point of its axis
• 4. all of the above

Question: The units of moment of inertia of an area are__________________?

• 1. kg m2
• 2. m4
• 3. kg/m2
• 4. m3