Engineering Mechanics MCQ Questions & Answers

51

Moment of inertia of a triangular section of base (b) and height (h) about an axis passing through its vertex and parallel to the base, is __________ than that passing through its C.G. and parallel to the base.

A) Nine times B) Six times C) Four times D) Two times

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Answer & Solution

Answer: Option A

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52

The periodic time (T) is given by (where, $$\omega $$ = Angular velocity of particle in rad/s.)

A) $$\frac{\omega }{{2\pi }}$$ B) $$\frac{{2\pi }}{\omega }$$ C) $$2\pi \times \omega $$ D) $$\frac{\pi }{\omega }$$

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Answer & Solution

Answer: Option B

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53

Moment of inertia of a triangular section of base (b) and height (h) about an axis through its base, is

A) $$\frac{{{\text{b}}{{\text{h}}^3}}}{4}$$ B) $$\frac{{{\text{b}}{{\text{h}}^3}}}{8}$$ C) $$\frac{{{\text{b}}{{\text{h}}^3}}}{{12}}$$ D) $$\frac{{{\text{b}}{{\text{h}}^3}}}{{36}}$$

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Answer & Solution

Answer: Option C

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54

If the masses of both the bodies, as shown in the below figure, are doubled, then the acceleration in the string will be
Engineering Mechanics mcq question image

Engineering Mechanics mcq question image

A) Same B) Half C) Double D) None of these

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Answer & Solution

Answer: Option A

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55

The centre of percussion is below the centre of gravity of the body and is at a distance equal to

A) $$\frac{{\text{h}}}{{{{\text{k}}_{\text{G}}}}}$$ B) $$\frac{{{{\text{h}}^2}}}{{{{\text{k}}_{\text{G}}}}}$$ C) $$\frac{{{\text{k}}_{\text{G}}^2}}{{\text{h}}}$$ D) $${\text{h}} \times {{\text{k}}_{\text{G}}}$$

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Answer & Solution

Answer: Option C

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56

The coefficient of friction depends on

A) Area of contact B) Shape of surfaces C) Strength of surfaces D) Nature of surface

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Answer & Solution

Answer: Option D

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57

A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:

A) Both the balls undergo an equal change in momentum B) The change in momentum suffered by rubber ball is more than the lead ball C) The change in momentum suffered by rubber ball is less than the lead ball D) None of the above

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Answer & Solution

Answer: Option B

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58

The moment of inertia of a solid cylinder of mass 'm', radius 'r' and length '$$l$$' about the longitudinal axis or polar axis is

A) $$\frac{{{\text{m}}{{\text{r}}^2}}}{2}$$ B) $$\frac{{{\text{m}}{{\text{r}}^2}}}{4}$$ C) $$\frac{{{\text{m}}{{\text{r}}^2}}}{6}$$ D) $$\frac{{{\text{m}}{{\text{r}}^2}}}{8}$$

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Answer & Solution

Answer: Option A

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59

In a framed structure, as shown in the below figure, the forces in the members AB and BC are respectively
Engineering Mechanics mcq question image

A) $$\sqrt 3 \,\,$$W (tensile) and 2W (compressive) B) 2W (tensile) and $$\sqrt 3 \,\,$$W (compressive) C) $$2\sqrt 3 \,\,$$W (tensile) and $$2\sqrt 3 \,\,$$W (compressive) D) None of the above

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Answer & Solution

Answer: Option A

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60

Forces are called coplanar when all of them acting on body lie in

A) One point B) One plane C) Different planes D) Perpendicular planes

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Answer & Solution

Answer: Option B

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Engineering Mechanics MCQ Questions & Answers | Mechanical Engineering