# Practice Test: Question Set - 10

**1. If two bodies having masses**

*m*_{1}and*m*_{2}(*m*_{1}>*m*_{2}) have equal kinetic energies, the momentum of body having mass*m*_{1}is _________ the momentum of body having mass*m*_{2}.- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None
of these

**2. Two coplanar couples having equal and opposite moments**

- (A) Balance each other

- (B) Produce a couple and
an unbalanced force

- (C) Are equivalent

- (D) Cannot balance each
other

**3. 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 [(*2

*a*+

*b)/(a*+

*b)]*

- (B)

*(h/*2

*) [(*2

*a*+

*b)/(a*+

*b)]*

- (C)

*(h/*3

*) [(*2

*a*+

*b)/(a*+

*b)]*

- (D)

*(h/*3

*) [(a*+

*b)/(*2

*a*+

*b)]*

**4. Non-coplanar 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) Meet at one
point and their lines of action also lie on the same plane

- (D) Do
not meet at one point, but their lines of action lie on the same plane

**5. 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

**6. The velocity of a particle moving with simple harmonic motion is _________ at the mean position.**

- (A) Zero

- (B) Minimum

- (C) Maximum

- (D) None
of these

**7. If rain is falling in the opposite direction of the movement of a pedestrian, he has to hold his umbrella**

- (A) More inclined when
moving

- (B) Less inclined when
moving

- (C) More inclined when
standing

- (D) Less inclined when
standing

**8. The linear velocity of a body rotating at ω rad/s along a circular path of radius**

*r*is given by- (A)

*ω/r*

- (B)

*ω.r*

- (C)

*ω*

^{2}/r- (D)

*ω*

^{2}.r**9. The C.G. of a solid hemisphere lies on the central radius 3**

*r*- (A) At distance — from the plane base 3

*r*

- (B) At distance — from the plane base 3

*r*

- (C) At distance — from the plane base 3

*r*

- (D) At distance — from the plane base

**10. The velocity ratio of a simple wheel and axle with**

*D*and*d*as the diameters of effort wheel and load axle, is- (A)

*D*+

*d*

- (B)

*D*-

*d*

- (C)

*D*×

*d*

- (D)

*D*/

*d*

**11. According to law of triangle of forces**

- (A) Three forces acting
at a point will be in equilibrium

- (B) Three forces acting at a point can be
represented by a triangle, each side being proportional to force

- (C) If three forces
acting upon a particle are represented in magnitude and direction by the sides
of a triangle, taken in order, they will be in equilibrium

- (D) If three forces
acting at a point are in equilibrium, each force is proportional to the sine of
the angle between the other two

**12. The loss of kinetic energy during inelastic impact, is given by (where**

*m*_{1}= Mass of the first body,*m*_{2}= Mass of the second body, and*u*_{1}and*u*_{2}= Velocities of the first and second bodies respectively.)- (A)

*[m₁ m₂/*2

*(m₁*+

*m₂)] (u₁ - u₂)²*

- (B)

*[*2

*(m₁*+

*m₂)/m₁ m₂] (u₁ - u₂)²*

- (C)

*[m₁ m₂/*2

*(m₁*+

*m₂)] (u₁² - u₂²)*

- (D)

*[*2

*(m₁*+

*m₂)/m₁ m₂] (u₁² - u₂²)*

**13. If a suspended body is struck at the center of percussion, then the pressure on die axis passing through the point of suspension will be**

- (A) Maximum

- (B) Minimum

- (C) Zero

- (D) Infinity

**14. A couple produces**

- (A) Translatory
motion

- (B) Rotational
motion

- (C) Combined
translatory and rotational motion

- (D) None
of the above

**15. The resolved part of the resultant of two forces inclined at an angle**

*'*

*θ'***in a given direction is equal to**

- (A) The algebraic sum of
the resolved parts of the forces in the given direction

- (B) The sum of the
resolved parts of the forces in the given direction

- (C) The difference of the forces multiplied by the
cosine of

*θ*

- (D) The sum of the forces multiplied by the
sine of

*θ*

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