# Practice Test: Question Set - 05

**1. If a set of given forces are such that their free vectors build a closed polygon, then**

- (A) The resultant force and resultant couple are always
zero

- (B) The resultant force is zero but resultant couple is
not zero

- (C) The resultant force is zero but resultant couple
may not be zero

- (D) The resultant force and resultant couple both may
not be zero

**2. To double the period of oscillation of a simple pendulum**

- (A) The
mass of its bob should be doubled

- (B) The
mass of its bob should be quadrupled

- (C) Its
length should be quadrupled

- (D) Its
length should be doubled

**3. 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

**4. A ball is dropped from a height of 2.25 m on a smooth floor and rises to a height of 1.00 m after the bounce. The coefficient of restitution between the ball and the floor is**

- (A) 0.33

- (B) 0.44

- (C) 0.57

- (D) 0.67

**5. If the resultant of two forces has the same magnitude as either of the force, then the angle between the two forces is**

- (A) 30°

- (B) 45°

- (C) 60°

- (D) 120°

**6. 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

**7. A string of length 90 cm is fastened to two points ‘**

*A’*and ‘*B’*at the same level 60 cm apart. A ring weighing 120 g is slided on the string. A horizontal force ‘*P’*is applied to the ring such that it is in equilibrium vertically below ‘*B’*. The value of ‘*P’*is:- (A) 40

*g*

- (B) 60

*g*

- (C) 80

*g*

- (D) 100

*g*

**8. A satellite is said to move in a synchronous orbit if it moves at an altitude of 36,000 km with a maximum velocity of about**

- (A) 7000 km per
hour

- (B) 8000 km per
hour

- (C) 9000
km per hour

- (D) 11,000 km
per hour

**9. A rigid body is in a stable equilibrium if the application of any force**

- (A) Can raise the CG of the body but cannot lower it

- (B) Tends to lower the CG of the body

- (C) Neither raises nor lowers the CG of the body

- (D) None of above

**10. The reaction at the support**

*B*of the beam shown in below figure is- (A) 1.6

*t*

- (B) 9.6

*t*

- (C) 8.5

*t*

- (D) 0.5

*t*

**11. A uniform rod 9 m long weighing 40 kg is pivoted at a point 2 m from one end where a weight of 120 kg is suspended. The required force acting at the end in a direction perpendicular to rod to keep it equilibrium, at an inclination 60° with horizontal, is**

- (A) 40 kg

- (B) 60 kg

- (C) 10 kg

- (D) 100 kg

**12. The instantaneous centre of a member lies at the point of intersection of two lines drawn at the ends of the member such that the lines are inclined to the direction of motion of the ends at**

- (A) 30°

- (B) 45°

- (C) 60°

- (D) 90°

**13. A flywheel of moment of inertia 20 kg.m is acted upon by a tangential force of 5 N at 2 m from its axis, for 3 seconds. The increase in angular velocity in radian per second is**

- (A) 1/2

- (B) 3/2

- (C) 2

- (D) 3

**14. The phenomenon of collision of two elastic bodies takes place because bodies**

- (A) Immediately
after collision come momentarily to rest

- (B) Tend
to compress each other till they are compressed maximum possible

- (C) Attempt
to regain its original shape due to their elasticities

- (D) All
the above

**15. The unit of Moment of Inertia of a body, is**

- (A)

*m*

- (B)

*m*

^{2}

- (C)

*m*

^{3}

- (D)

*m*

^{4}

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