Important questions about Applied Mechanics. Applied Mechanics MCQ questions with answers. Applied Mechanics exam questions and answers for students and interviews.

1. To avoid bending action at the base of a pier,

Options

A : suspension and anchor cables are kept at the same level

B : suspension and anchor cables are fixed to pier top

C : suspension cable and anchor cables are attached to a saddle mounted on rollers on top of the pier

D : none the these.

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

Options

A : uneven distribution of the gravitational field

B : gravity of the sun and the moon

C : aerodynamic forces

D : none of these.

4. A spring scale in a stationary lift shows a reading of 60 kg for a man standing on it. If the lift starts descending at an acceleration of g/5, the scale reading would be

Options

A : 48 kg

B : 60 kg

C : 72 kg

D : none of these.

5. Lami's theroem states that

Options

A : three forces acting at a point are always in equilibrium

B : if three forces acting on a point can be represented in magnitude and direction by the sides of a triangle, the point will be in the state of equilibrium

C : three coplaner forces acting at a point will be in equilibrium, if each force is proportional to the sine of the angle between the other two

D : three coplaner forces acting at a point will be in equilibrium if each force is inversely proportional to the sine of the angle between the other two

6. Which one of the following laws is not applicable to a simple pendulum?.

Options

A : The time period does not depend on its magnitude

B : The time period is proportional to its length l

C : The time period is proportional to l where l is length

D : The time period is inversely proportional to g where g is the acceleration due to gravity.

8. If two forces acting at a point are in equilibrium, they must be equal in magnitude and their line of action must be along

Options

A : the same line in the same sense

B : the same line in opposite sense

C : the perpendicular to both the lines

D : none of these.

9. The following is not a law of static friction :

Options

A : The force of friction always acts in a direction opposite to that in which the body tends to move

B : The force of friction is dependent upon the area of contact

C : The force of friction depends upon the roughness of the surface

D : The magnitude of the limiting friction bears a constant ratio to the normal reaction between two surfaces.

10. A Seconds pendulum executes

Options

A : 0.5 beat per second

B : 1.0 beat per second

C : 2.0 beats per second

D : 2.5 beats per second

1. The acceleration of a train starting from rest at any instant is where V is the velocity of the train in m/sec. The train will attain a velocity of 36 km/hour after travelling a distance of

Options

A : 2000 m

B : 2100 m

C : 2200 m

D : 2300 m

2. A marble ball is rolled on a smooth floor of a room to hit a wall. If the time taken by the ball in returning to the point of projection is twice the time taken in reaching the wall, the coefficient of restitution between the ball and the wall, is

Options

A : 0.25

B : 0.50

C : 0.75

D : 1.0

3. The apparent weight of a man in a moving lift is less than his real weight when it is going down with

Options

A : uniform speed

B : an acceleration

C : linear momentum

D : retardation.

5. A number of forces acting simultaneously on a particle of a body

Options

A : may not be replaced by a single force

B : may be replaced by a single force

C : may be replaced by a single force through C.G. of the body

D : may be replaced by a couple

6. P is the force acting on a body whose mass is m and acceleration is f . The equation P - mf = 0, is known as

Options

A : equation of dynamics

B : equation of dynamic equilibrium

C : equation of statics

D : none of these.

7. The necessary condition of equilibrium of a body, is :

Options

A : algebraic sum of horizontal components of all the forces must be zero

B : algebraic sum of vertical components of all the forces must be zero

C : algebraic sum of the moments of the forces about a point must be zero

D : all (a), (b) and (c).

8. Principle of Transmissibility of Forces states that, when a force acts upon a body, its effect is

Options

A : maximum if it acts at the centre of gravity of the body

B : different at different points on its line of

C : same at every point on its line of action

D : minimum if it acts at the C.G. of the body

10. A 49 kg lady stands on a spring scale in an elevator. During the first 5 sec, starting from rest, the scale reads 69 kg. The velocity of the elevator will be

Options

A : 10 m/sec

B : 15 m/sec

C : 20 m/sec

D : 25 m/sec.

1. Two particles have been projected at angles 64° and 45° to the horizontal. If the velocity of projection of first is 10 m/sec, the velocity of projection of the other for equal horizontal ranges is

Options

A : 9.3 m/sec

B : 8.3 m/sec

C : 7.3 m/sec

D : 6.3 m/sec.

3. Pick up the incorrect statement from the following :

Options

A : The C.G. of a circle is at its centre

B : The C.G. of a triangle is at the intersecton of its medians

C : The C.G. of a rectangle is at the intersection of its diagonals

D : The C.G. of a semicircle is at a distance of r /2 from the centre

4. The moment of inertia of a hollow circular section whose external diameter is 8 cm and internal diameter is 6 cm, about centroidal axis, is

Options

A : 437.5 cm 4

B : 337.5 cm 4

C : 237.5 cm 4

D : 137.5 cm 4

5. A load of 500 kg was lifted through a distance of 13 cm. by an effort of 25 kg which moved through a distance of 650 cm. The velocity ratio of the lifting machine is