Applied Mechanics And Graphic Statics MCQ Questions & Answers

11

A rod AB carries three loads of 30 N, 70 N and 100 N at distances of 20 mm, 90 mm and 150 mm respectively from A. Neglecting the weight of the rod, the point at which the rod will balance is

A) 109.5 mm from A B) 119.5 mm from A C) 125.5 mm from A D) 132.5 mm from A

Discuss

Answer & Solution

Answer: Option A

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12

The member forces in a statically in determinate truss

A) Can be obtained by graphic statics B) Cannot be obtained by graphic statics C) May be obtained by graphic statics D) Can be obtained by graphic statics by trial and error

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Answer & Solution

Answer: Option B

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13

If v and $$\omega $$ are linear and angular velocities, the centripetal acceleration of a moving body along the circular path of radius r, will be

A) $$\frac{{\text{r}}}{{{{\text{v}}^2}}}$$ B) $$\frac{{{{\text{v}}^2}}}{{\text{r}}}$$ C) $$\frac{{\text{r}}}{{{\omega ^2}}}$$ D) $$\frac{{{\omega ^2}}}{{\text{r}}}$$ E) $${\text{r}}\omega $$

Discuss

Answer & Solution

Answer: Option B

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14

To attain the synchronous orbit, the launch of a satellite, is done from a place

A) On equator B) On 30° latitude C) On 45° latitude D) On the poles

Discuss

Answer & Solution

Answer: Option A

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15

The rotational velocity of a satellite is increased by 450 m per second if its launch is done from equator

A) Eastward B) Northward C) Westward D) Southward

Discuss

Answer & Solution

Answer: Option A

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16

When a body in equilibrium undergoes an infinitely small displacement, work imagined to be done, is known as

A) Imaginary work B) Negative work C) Virtual work D) None of these

Discuss

Answer & Solution

Answer: Option C

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17

A ball which is thrown upwards, returns to the ground describing a parabolic path during its flight

A) Vertical component of velocity remains constant B) Horizontal component of velocity remains constant C) Speed of the ball remains constant D) Kinetic energy of the ball remains constant

Discuss

Answer & Solution

Answer: Option B

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18

A body A of mass 6.6 kg which is lying on a horizontal platform 4.5 m from its edge is connected to the end of a light string whose other end is supporting a body of mass 3.2 kg as shown in below figure. If the friction between the platform and the body A is $$\frac{1}{3}$$, the acceleration is
Applied Mechanics and Graphic Statics mcq question image

Applied Mechanics and Graphic Statics mcq question image

A) 0.5 m/sec² B) 0.75 m/sec² C) 1.00 m/sec² D) 1.25 m/sec²

Discuss

Answer & Solution

Answer: Option C

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19

A cylinder will slip on an inclined plane of inclination angle $$\theta $$ if the coefficient of static friction between plane and cylinder is

A) less than $$\frac{1}{3}\tan \theta $$ B) less than $$\frac{2}{3}\tan \theta $$ C) less than $$\frac{1}{3}\sin \theta $$ D) less than $$\frac{2}{3}\sin \theta $$

Discuss

Answer & Solution

Answer: Option A

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20

The following factor affects the orbit of a satellite up to an altitude of 720 km from the earth's surface

A) Uneven distribution of the gravitational field B) Gravity of the sun and the moon C) Aerodynamic forces D) None of these

Discuss

Answer & Solution

Answer: Option C

Solution:

Why: Up to about 720 km altitude, satellites are still in Low Earth Orbit (LEO), where the atmosphere is very thin but not absent. The residual air molecules produce aerodynamic drag on a satellite moving at roughly 7.5 km/s, which continuously removes orbital energy and causes gradual orbital decay.

Option A (Uneven gravitational field): Earth’s oblateness and mass irregularities do perturb orbits (e.g., nodal and apsidal precession), but at ~720 km these effects are secondary compared with drag when considering orbit maintenance and decay over practical timescales.

Option B (Gravity of the Sun and Moon): Third-body perturbations exist at all altitudes but are comparatively minor for LEO; their influence becomes relatively more important at higher altitudes (e.g., MEO/GEO).

Option C (Aerodynamic forces): Dominant disturbance in LEO up to ~720 km. Drag reduces velocity, lowers perigee, and accelerates decay, requiring periodic reboosts for orbit maintenance.

Conclusion: At altitudes up to 720 km, aerodynamic drag is the principal factor affecting a satellite’s orbit, making Option C correct.

Applied Mechanics And Graphic Statics MCQ Questions & Answers | Civil Engineering