Coulomb friction is the friction between_____________________?

Related Mcqs:

1. Dynamic friction as compared to static friction is __________________?

   A. same
   B. more
   C. less
   D. may be less of more depending on nature of surfaces and velocity
   E. has no correlation

2. The co-efficient of friction depends upon _________________?

   A. nature of surfaces
   B. area of contact
   C. shape of the surfaces
   D. ail of the above.
   E. A. and B. above

3. A particle inside a hollow sphere of radius r, having coefficient of friction -rr can rest upto height of___________________?

   A. r/2
   B. r/A
   C. r/%
   D. 0.134 r
   E. 3r/8

4. The effort required to lift a load W on a screw jack with helix angle a and angle of friction <j) is equal to__________________?

   A. Wtan(a + )
   B. Wtan(a-)
   C. Wcos(a + )
   D. Wsin(a + )
   E. W (sin a + cos ).

5. The materials having same elastic properties in all directions are called________________?

   A. ideal materials
   B. uniform materials
   C. isotropic materials
   D. paractical materials
   E. elastic materials

6. The stress at which extension of the material takes place more quickly as compared to the increase in load is called______________?

   A. elastic point of the material
   B. plastic point of the material
   C. breaking point of the material
   D. yielding point of the material
   E. ultimate point of the material

7. The force acting along the circumference will cause stress in the walls in a direction normal to the longitudinal axis of cylinder; this stress is called___________________?

   A. longitudinal stress
   B. hoop stress
   C. yeiled stress
   D. ultimate stress
   E. none of the above

8. The C.G. of a right circular solid cone of height h lies at the following distance from the base________________?

   A. h/2
   B. J/3
   C. h/6
   D. h/4
   E. 3/i/5

9. Longitudinal stress in a thin cylinder is__________________?

   A. equal to the hoop stress
   B. twice the hoop stress
   C. half of the hoop stress
   D. one-fourth of hoop stress
   E. four times the hoop stress

10. The stress necessary to initiate yielding is_________________?

    A. considerably greater than that necessary to continue it
    B. considerably lesser than that necessary to continue it
    C. greater than that necessary to stop it
    D. lesser than that necessary to stop it
    E. equal to that necessary to stop it