606 + Mcqs in Engineering Mechanics Page 7 McqOptions

301.	*$_The forces which do not meet at one point and their lines of action do not lie on the same plane are known as?
A.	Coplanar concurrent forces
B.	Coplanar non-concurrent forces
C.	Non-coplanar concurrent forces
D.	None of these
Answer» E.

Discussion

302.	*$_The velocity ratio in case of an inclined plane inclined at angle '≈í‚àè' to the horizontal and weight being pulled up the inclined plane by vertical effort is?
A.	sin≈í‚àè
B.	cos≈í‚àè
C.	tan≈í‚àè
D.	cosec≈í‚àè
Answer» B. cos≈í‚àè

Discussion

303.	*$_The efficiency of a lifting machine is the ratio of?
A.	Output to the input
B.	Work done by the machine to the work done on the machine
C.	Mechanical advantage to the velocity ratio
D.	All of the above
Answer» E.

Discussion

304.	*$_For any system of coplanar forces, the condition of equilibrium is that the?
A.	Algebraic sum of the horizontal components of all the forces should be zero
B.	Algebraic sum of the vertical components of all the forces should be zero
C.	Algebraic sum of moments of all the forces about any point should be zero
D.	All of the above
Answer» E.

Discussion

305.	*$_A block of mass m‚Äö√á√Ö, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m‚Äö√á√á, which moves vertically downwards as shown in the below figure. The tension in the string is?
A.	m‚Äö√á√Ö/m‚Äö√á√á
B.	m‚Äö√á√Ö. g. sin ≈í¬±
C.	m‚Äö√á√Ö.m‚Äö√á√á/m‚Äö√á√Ö + m‚Äö√á√á
D.	m‚Äö√á√Ö. m‚Äö√á√á.g (1 + sin ≈í¬±)/(m‚Äö√á√Ö + m‚Äö√á√á)
Answer» E.

Discussion

306.	*$_According to principle of moments?
A.	If a system of coplanar forces is in equilibrium, then their algebraic sum is zero
B.	If a system of coplanar forces is in equilibrium, then the algebraic sum of their moments about any point in their plane is zero
C.	The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point
D.	Positive and negative couples can be balanced
Answer» C. The algebraic sum of the moments of any two forces about any point is equal to moment of the resultant about the same point

Discussion

307.	*$_In the equation of virtual work, following force is neglected?
A.	Reaction of any smooth surface with which the body is in contact
B.	Reaction of a rough surface of a body which rolls on it without slipping
C.	Reaction at a point or an axis, fixed in space, around which a body is constrained to turn
D.	All of the above
Answer» E.

Discussion

308.	*$_The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (≈í¬±) is?
A.	≈í‚â§/2
B.	30¬¨‚àû + ≈í‚â§/2
C.	45¬¨‚àû + ≈í‚â§/2
D.	60¬¨‚àû + ≈í‚â§/2
Answer» D. 60¬¨‚àû + ≈í‚â§/2

Discussion

309.	*$_A couple produces?
A.	Translatory motion
B.	Rotational motion
C.	Combined translatory and rotational motion
D.	None of the above
Answer» C. Combined translatory and rotational motion

Discussion

310.	*$_The product of either force of couple with the arm of the couple is called?
A.	Resultant couple
B.	Moment of the forces
C.	Resulting couple
D.	Moment of the couple
Answer» E.

Discussion

311.	*$_When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is?
A.	mv2
B.	mgv2
C.	0.5 mv2
D.	0.5 mgv2
Answer» D. 0.5 mgv2

Discussion

312.	*$_The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is?
A.	Same
B.	Double
C.	Half
D.	Four times
Answer» C. Half

Discussion

313.	*$_The maximum height of a projectile on a horizontal plane, is?
A.	u¬¨‚â§ sin¬¨‚â§≈í¬±/2g
B.	u¬¨‚â§ cos¬¨‚â§≈í¬±/2g
C.	u¬¨‚â§ sin¬¨‚â§≈í¬±/g
D.	u¬¨‚â§ cos¬¨‚â§≈í¬±/g
Answer» B. u¬¨‚â§ cos¬¨‚â§≈í¬±/2g

Discussion

314.	*$_According to principle of transmissibility of forces, the effect of a force upon a body is?
A.	maximum when it acts at the center of gravity of a body
B.	different at different points in its line of action
C.	the same at every point in its line of action
D.	minimum when it acts at the C.G. of the body
Answer» D. minimum when it acts at the C.G. of the body

Discussion

315.	*$_A screw jack used for lifting the loads is?
A.	A reversible machine
B.	A non-reversible machine
C.	An ideal machine
D.	None of these
Answer» C. An ideal machine

Discussion

316.	*$_The coefficient of restitution for inelastic bodies is?
A.	Zero
B.	One
C.	Between zero and one
D.	More than one
Answer» B. One

Discussion

317.	*$_If the gravitational acceleration at any place is doubled, then the weight of a body will be?
A.	g/2
B.	g
C.	‚Äö√ √∂2.g
D.	2g
Answer» E.

Discussion

318.	*$_If three forces acting in different planes can be represented by a triangle, these will be in?
A.	Non-equilibrium
B.	Partial equilibrium
C.	Full equilibrium
D.	Unpredictable
Answer» B. Partial equilibrium

Discussion

319.	/_The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.?
A.	Directly
B.	Inversely
C.	Square root
D.	None of these
Answer» C. Square root

Discussion

320.	/_The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60¬¨‚àû produce resultant of Vl3 kg. These forces are?
A.	2 and V6
B.	3 and 1 kg
C.	V5andV5
D.	2 and 5
Answer» D. 2 and 5

Discussion

321.	/_If the body falls freely under gravity, then the gravitational acceleration is taken as?
A.	+8.9 m/s2
B.	-8.9 m/s2
C.	+9.8 m/s2
D.	-9.8 m/s2
Answer» D. -9.8 m/s2

Discussion

322.	/_The units of moment of inertia of an area are?
A.	kg-m¬¨‚â§
B.	m‚Äö√Ö¬•
C.	kg/m¬¨‚â§
D.	m¬¨‚â•
Answer» C. kg/m¬¨‚â§

Discussion

323.	/_The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)?
A.	n
B.	n¬¨‚â§
C.	2n
D.	2n - 1
Answer» D. 2n - 1

Discussion

324.	/_A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.?
A.	Equal to
B.	Less than
C.	Greater than
D.	None of these
Answer» D. None of these

Discussion

325.	/_The linear velocity of a body rotating at ≈ì√¢ rad/s along a circular path of radius r is given by?
A.	≈ì√¢/r
B.	≈ì√¢.r
C.	≈ì√¢¬¨‚â§/r
D.	≈ì√¢¬¨‚â§.r
Answer» C. ≈ì√¢¬¨‚â§/r

Discussion

326.	/_The below figure shows the two equal forces at right angles acting at a point. The value of force ‚Äö√Ñ√≤R‚Äö√Ñ√¥ acting along their bisector and in opposite direction is?
A.	P/2
B.	2P
C.	‚Äö√ √∂2 ‚àö√≥ P
D.	P/‚Äö√ √∂2
Answer» D. P/‚Äö√ √∂2

Discussion

327.	/_Whenever a force acts on a body and the body undergoes a displacement, then?
A.	Work is said to be done
B.	Power is being transmitted
C.	Body has kinetic energy of translation
D.	None of these
Answer» B. Power is being transmitted

Discussion

328.	/_According to Newton's first law of motion,?
A.	Everybody continues in its state of rest or of uniform motion, in a straight line, unless it is acted upon by some external force
B.	The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts
C.	To every action, there is always an equal and opposite reaction
D.	None of the above
Answer» B. The rate of change of momentum is directly proportional to the impressed force, and takes place in the same direction, in which the force acts

Discussion

329.	/_The ideal angle of banking provided on the curves on roads depends upon?
A.	Weight of the vehicle
B.	(Velocity)2 of the vehicle
C.	Nature of the road surface
D.	Coefficient of friction between the road and vehicle contact point
Answer» C. Nature of the road surface

Discussion

330.	/_Non-coplanar non-concurrent forces are those forces which?
A.	Meet at one point, but their lines of action do not lie on the same plane
B.	Do not meet at one point and their lines of action do not lie on the same plane
C.	Do not meet at one point but their lines of action lie on the same plane
D.	None of the above
Answer» C. Do not meet at one point but their lines of action lie on the same plane

Discussion

331.	/_The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.?
A.	Lie
B.	Do not lie
C.	Either A or B
D.	None of these
Answer» C. Either A or B

Discussion

332.	/_The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by?
A.	P + Q
B.	P - Q
C.	P / Q
D.	Q / P
Answer» C. P / Q

Discussion

333.	/_The law of motion involved in the recoil of gun is?
A.	Newton's first law of motion
B.	Newton's second law of motion
C.	Newton's third law of motion
D.	None of these
Answer» D. None of these

Discussion

334.	/_The weight of a body is due to?
A.	Gravitational pull exerted by the earth
B.	Forces experienced by body in atmosphere
C.	Force of attraction experienced by particles
D.	Gravitational force of attraction towards the centre of the earth
Answer» E.

Discussion

335.	/_Two blocks ‚Äö√Ñ√≤A‚Äö√Ñ√¥ and ‚Äö√Ñ√≤B‚Äö√Ñ√¥ of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.?
A.	Will
B.	Will not
C.	Either A or B
D.	None of these
Answer» B. Will not

Discussion

336.	/_The rate of doing work is known as?
A.	Potential energy
B.	Kinetic energy
C.	Power
D.	None of these
Answer» D. None of these

Discussion

337.	/_The center of gravity of a trapezium with parallel sides 'a' and 'b' lies at a distance of 'y' from the base 'b', as shown in the below figure. The value of 'y' is?
A.	h [(2a + b)/(a + b)]
B.	(h/2) [(2a + b)/(a + b)]
C.	(h/3) [(2a + b)/(a + b)]
D.	(h/3) [(a + b)/(2a + b)]
Answer» D. (h/3) [(a + b)/(2a + b)]

Discussion

338.	/_The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of ≈í¬± rad/s2, is?
A.	a = ≈í¬±/ r
B.	a = ≈í¬±.r
C.	a = r / ≈í¬±
D.	None of these
Answer» C. a = r / ≈í¬±

Discussion

339.	/_A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if?
A.	The floor is smooth, the wall is rough
B.	The floor is rough, the wall is smooth
C.	The floor and wall both are smooth surfaces
D.	The floor and wall both are rough surfaces
Answer» D. The floor and wall both are rough surfaces

Discussion

340.	/_The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is?
A.	9 cm4
B.	12 cm4
C.	16 cm4
D.	20 cm4
Answer» D. 20 cm4

Discussion

341.	/_If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be?
A.	Same
B.	Half
C.	Double
D.	None of these
Answer» C. Double

Discussion

342.	/_The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be?
A.	20 kg, -ve sense
B.	20 kg, + ve sense
C.	10 kg, + ve sense
D.	10 kg, -ve sense
Answer» B. 20 kg, + ve sense

Discussion

343.	/_According to Lami‚Äö√Ñ√¥s theorem?
A.	The three forces must be equal
B.	The three forces must be at 120¬¨‚àû to each other
C.	The three forces must be in equilibrium
D.	If the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two
Answer» E.

Discussion

344.	/_The coefficient of friction depends upon?
A.	Nature of surfaces
B.	Area of contact
C.	Shape of the surfaces
D.	All of the above
Answer» B. Area of contact

Discussion

345.	/_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
Answer» E.

Discussion

346.	/_Two bodies of masses m‚Äö√á√Ö and m‚Äö√á√á are hung from the ends of a rope, passing over a frictionless pulley as shown in the figure below. The acceleration of the string will be Engineering Mechanics?
A.	g (m‚Äö√á√Ö - m‚Äö√á√á)/(m‚Äö√á√Ö + m‚Äö√á√á)
B.	2g (m‚Äö√á√Ö - m‚Äö√á√á)/(m‚Äö√á√Ö + m‚Äö√á√á)
C.	g (m‚Äö√á√Ö + m‚Äö√á√á)/(m‚Äö√á√Ö - m‚Äö√á√á)
D.	2g (m‚Äö√á√Ö + m‚Äö√á√á)/(m‚Äö√á√Ö - m‚Äö√á√á)
Answer» B. 2g (m‚Äö√á√Ö - m‚Äö√á√á)/(m‚Äö√á√Ö + m‚Äö√á√á)

Discussion

347.	/_Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to?
A.	Area of the triangle
B.	Twice the area of the triangle
C.	Half the area of the triangle
D.	None of these
Answer» C. Half the area of the triangle

Discussion

348.	/_The forces, whose lines of action are parallel to each other and act in the same directions, are known as?
A.	Coplanar concurrent forces
B.	Coplanar non-concurrent forces
C.	Like parallel forces
D.	Unlike parallel forces
Answer» D. Unlike parallel forces

Discussion

349.	/_The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.?
A.	Equal to
B.	Less than
C.	Greater than
D.	None of these
Answer» B. Less than

Discussion

350.	/_If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.?
A.	Change
B.	Does not change
C.	Changes periodically
D.	None of these
Answer» C. Changes periodically

Discussion

Explore topic-wise MCQs in Mechanical Engineering.

*$_The forces which do not meet at one point and their lines of action do not lie on the same plane are known as?

*$_The velocity ratio in case of an inclined plane inclined at angle '≈í‚àè' to the horizontal and weight being pulled up the inclined plane by vertical effort is?

*$_The efficiency of a lifting machine is the ratio of?

*$_For any system of coplanar forces, the condition of equilibrium is that the?

*$_A block of mass m‚Äö√á√Ö, placed on an inclined smooth plane is connected by a light string passing over a smooth pulley to mass m‚Äö√á√á, which moves vertically downwards as shown in the below figure. The tension in the string is?

*$_According to principle of moments?

*$_In the equation of virtual work, following force is neglected?

*$_The range of projectile will be maximum for a given velocity of projectile, when the angle of projection (≈í¬±) is?

*$_A couple produces?

*$_The product of either force of couple with the arm of the couple is called?

*$_When a body of mass 'm' attains a velocity 'v' from rest in time 't', then the kinetic energy of translation is?

*$_The M.I. of hollow circular section about a central axis perpendicular to section as compared to its M.I. about horizontal axis is?

*$_The maximum height of a projectile on a horizontal plane, is?

*$_According to principle of transmissibility of forces, the effect of a force upon a body is?

*$_A screw jack used for lifting the loads is?

*$_The coefficient of restitution for inelastic bodies is?

*$_If the gravitational acceleration at any place is doubled, then the weight of a body will be?

*$_If three forces acting in different planes can be represented by a triangle, these will be in?

*/*_The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.?

*/*_The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60¬¨‚àû produce resultant of Vl3 kg. These forces are?

*/*_If the body falls freely under gravity, then the gravitational acceleration is taken as?

*/*_The units of moment of inertia of an area are?

*/*_The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)?

*/*_A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.?

*/*_The linear velocity of a body rotating at ≈ì√¢ rad/s along a circular path of radius r is given by?

*/*_The below figure shows the two equal forces at right angles acting at a point. The value of force ‚Äö√Ñ√≤R‚Äö√Ñ√¥ acting along their bisector and in opposite direction is?

*/*_Whenever a force acts on a body and the body undergoes a displacement, then?

*/*_According to Newton's first law of motion,?

*/*_The ideal angle of banking provided on the curves on roads depends upon?

*/*_Non-coplanar non-concurrent forces are those forces which?

*/*_The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.?

*/*_The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by?

*/*_The law of motion involved in the recoil of gun is?

*/*_The weight of a body is due to?

*/*_Two blocks ‚Äö√Ñ√≤A‚Äö√Ñ√¥ and ‚Äö√Ñ√≤B‚Äö√Ñ√¥ of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.?

*/*_The rate of doing work is known as?

*/*_The center of gravity of a trapezium with parallel sides 'a' and 'b' lies at a distance of 'y' from the base 'b', as shown in the below figure. The value of 'y' is?

*/*_The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of ≈í¬± rad/s2, is?

*/*_A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if?

*/*_The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is?

*/*_If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be?

*/*_The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be?

*/*_According to Lami‚Äö√Ñ√¥s theorem?

*/*_The coefficient of friction depends upon?

*/*_The C.G. of a right circular solid cone of height h lies at the following distance from the base?

*/*_Two bodies of masses m‚Äö√á√Ö and m‚Äö√á√á are hung from the ends of a rope, passing over a frictionless pulley as shown in the figure below. The acceleration of the string will be Engineering Mechanics?

*/*_Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to?

*/*_The forces, whose lines of action are parallel to each other and act in the same directions, are known as?

*/*_The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.?

*/*_If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.?

/_The periodic time of a particle with simple harmonic motion is _________ proportional to the angular velocity.?

/_The magnitude of two forces, which when acting at right angle produce resultant force of VlOkg and when acting at 60¬¨‚àû produce resultant of Vl3 kg. These forces are?

/_If the body falls freely under gravity, then the gravitational acceleration is taken as?

/_The units of moment of inertia of an area are?

/_The velocity ratio for the first system of pulleys is (where n is the number of pulleys.)?

/_A body will begin to move down an inclined plane if the angle of inclination of the plane is _________ the angle of friction.?

/_The linear velocity of a body rotating at ≈ì√¢ rad/s along a circular path of radius r is given by?

/_The below figure shows the two equal forces at right angles acting at a point. The value of force ‚Äö√Ñ√≤R‚Äö√Ñ√¥ acting along their bisector and in opposite direction is?

/_Whenever a force acts on a body and the body undergoes a displacement, then?

/_According to Newton's first law of motion,?

/_The ideal angle of banking provided on the curves on roads depends upon?

/_Non-coplanar non-concurrent forces are those forces which?

/_The forces which meet at one point, but their lines of action __________ on the same plane, are Known as non-coplanar concurrent forces.?

/_The resultant of two forces P and Q (such that P > Q) acting along the same straight line, but in opposite direction, is given by?

/_The law of motion involved in the recoil of gun is?

/_The weight of a body is due to?

/_Two blocks ‚Äö√Ñ√≤A‚Äö√Ñ√¥ and ‚Äö√Ñ√≤B‚Äö√Ñ√¥ of masses 150 kg and 50 kg respectively are connected by means of a string as shown in the below figure. The tension in all the three strings __________ be same.?

/_The rate of doing work is known as?

/_The center of gravity of a trapezium with parallel sides 'a' and 'b' lies at a distance of 'y' from the base 'b', as shown in the below figure. The value of 'y' is?

/_The linear acceleration (a) of a body rotating along a circular path of radius (r) with an angular acceleration of ≈í¬± rad/s2, is?

/_A heavy ladder resting on floor and against a vertical wall may not be in equilibrium, if?

/_The moment of inertia of a rectangular section 3 cm wide and 4 cm deep about X-X axis is?

/_If the masses of both the bodies, as shown in the below figure, are reduced to 50 percent, then tension in the string will be?

/_The resultant of the following three couples 20 kg force, 0.5 m arm, +ve sense 30 kg force, 1 m arm, -ve sense 40 kg force, 0.25 m arm, +ve sense having arm of 0.5 m will be?

/_According to Lami‚Äö√Ñ√¥s theorem?

/_The coefficient of friction depends upon?

/_The C.G. of a right circular solid cone of height h lies at the following distance from the base?

/_Two bodies of masses m‚Äö√á√Ö and m‚Äö√á√á are hung from the ends of a rope, passing over a frictionless pulley as shown in the figure below. The acceleration of the string will be Engineering Mechanics?

/_Three forces acting on a rigid body are represented in magnitude, direction and line of action by the three sides of a triangle taken in order. The forces are equivalent to a couple whose moment is equal to?

/_The forces, whose lines of action are parallel to each other and act in the same directions, are known as?

/_The potential energy of a vertically raised body is __________ the kinetic energy of a vertically falling body.?

/_If a given force (or a given system of forces) acting on a body __________ the position of the body, but keeps it in equilibrium, then its effect is to produce internal stress in the body.?