Pick out the correct statement ?

Related Mcqs:

1. Pick out the correct statement about the condensation?

   A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
   B. Suitable coating or vapour additive is used to promote film wise condensation
   C. If a condensing liquid does not wet the surface dropwise, even then condensation will take
   place on it
   D. Reynolds number of condensing liquid is based on its mass flow rate

2. Pick out the correct statement?

   A. Hot worked materials are subjected to annealing to remove internal stresses
   B. Annealing of steel hardens it slightly
   C. Normalising of a material induces stresses
   D. Tempering of a material improves ductility & toughness but reduces hardness & brittleness

3. Pick out the correct combination about the role of various additives used in polymers ?

   A. Plasticiser: increases the polymer strength
   B. Heat stabiliser: increases the maximum service temperature
   C. Fillers: Does not affect the property of polymer but increases its weight
   D. Lubricants: increases the flexibility of polymers

4. Pick out the wrong statement about the machinability of metals. Machinability of a metal ?

   A. Decreases with increase in strain hardening tendencies
   B. Decreases with increase in hardness, in general
   C. Depend on the composition, microstructure and physical & mechanical properties
   D. Decreases with increases in tensile strength & decrease in grain size

5. Pick out the wrong statement?

   A. Processing of thermosetting plastics is ideally done by injection moulding
   B. Processing of thermoplastics is ideally done by compression moulding
   C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
   D. Stretch forming is a process of cold drawing

6. Pick out the wrong statement?

   A. Complete unity of command exists in a line organisation
   B. Line organisation is net suitable for expansion and growth of an industry
   C. In line and staff organisation, “line” executes and “staff directs
   D. None of these

7. Pick out the wrong statement ?

   A. Molecules with symmetrical arrangements (e.g. CH4 or CCl4) are non-polar
   B. Generally, non-polar compounds are chemically inactive, conduct electricity poorly and do
   not ionise
   C. Most of the hydrocarbons are non-polar
   D. None of these

8. Pick out the wrong statement ?

   A. The X-rays cannot be deflected by electric field unlike cathode rays
   B. The intensity of X-rays can be measured by ionisation current produced due to the ionisation
   of gas by X-rays
   C. The quality of X-rays can be controlled by varying the anode-cathode voltage
   D. Crystal structure of a material can be studied by an electron microscope

9. Pick out the wrong statement?

   A. Ductile fracture of a stressed material, which exhibits a large plastic deformation is commonly
   caused by the formation and coalescence of voids in the necked region
   B. Brittle fracture is caused by the propagation of pre-existing cracks in the material and involves minimum plastic deformation
   C. Fatigue fracture of a material is always brittle in nature and takes place due to the existence of
   line imperfections
   D. Brittle materials are generally tested in tension

10. Pick out the wrong statement ?

    A. The equivalent stiffness of two springs (of equal stiffness ‘S’) in series is S/2 while in parallel
    is 2S
    B. For a helical spring, deflection is proportional to D3 (D = mean coil diameter) or d4 (d = wire
    diameter)
    C. Crushing load or columns is less than the buckling load
    D. Modulus of resilience is proportional to (stress at elastic limit)2