Strength Of Materials(Civil Engineering ) Questions and Answers

Question 1. The weight of a body is due to
  1.    Centripetal force of earth
  2.    Gravitational pull exerted by the earth
  3.    Force of attraction experienced by par-ticles
  4.    Gravitational force of attraction towards the centre of the earth
Explanation:-
Answer: Option D. -> Gravitational force of attraction towards the centre of the earth
Question 2. Which of the following is the locus of a point that moves in such a manner that its distance from a fixed point is equal to its distance from a fixed line multiplied by a constant greater than one
  1.    Ellipse
  2.    Hyperbola
  3.    Parabola
  4.    Circle
Explanation:-
Answer: Option B. -> Hyperbola
Question 3. 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
Explanation:-
Answer: Option D. -> Moment of the couple
Question 4. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal
  1.    Density of metal can’t be determined
  2.    Metal is twice as dense as water
  3.    Metal will float in water
  4.    Metal is twice as dense as unknown fluid
Explanation:-
Answer: Option A. -> Density of metal can’t be determined
Question 5. Coulomb friction is the friction between
  1.    Bodies having relative motion
  2.    Two dry surfaces
  3.    Two lubricated surfaces
  4.    Solids and liquids
Explanation:-
Answer: Option A. -> Bodies having relative motion
Question 6. 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
Explanation:-
Answer: Option C. -> The mid point of its axis
Question 7. The center of gravity of a triangle lies at the point of
  1.    Concurrence of the medians
  2.    Intersection of its altitudes
  3.    Intersection of bisector of angles
  4.    Intersection of diagonals
Explanation:-
Answer: Option A. -> Concurrence of the medians
Question 8. A particle inside a hollow sphere of radius r, having coefficient of friction $$\frac{1}{{\sqrt 3 }}$$ can rest upto height of
  1.    $$\frac{{\text{r}}}{4}$$
  2.    $$\frac{{\text{r}}}{8}$$
  3.    $$0.134{\text{ r}}$$
  4.    $$\frac{{3{\text{r}}}}{8}$$
Explanation:-
Answer: Option D. -> $$\frac{{3{\text{r}}}}{8}$$
Question 9. A flywheel on a motor goes from rest to 1000 rpm in 6 sec. The number of revolutions made is nearly equal to
  1.    25
  2.    50
  3.    100
  4.    250
Explanation:-
Answer: Option B. -> 50
Question 10. The center of percussion of the homogeneous rod of length L suspended at the top will be
  1.    $$\frac{{\text{L}}}{2}$$
  2.    $$\frac{{\text{L}}}{3}$$
  3.    $$\frac{{3{\text{L}}}}{4}$$
  4.    $$\frac{{2{\text{L}}}}{3}$$
Explanation:-
Answer: Option D. -> $$\frac{{2{\text{L}}}}{3}$$
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