# Practice Test: Question Set - 18

**1. Joule is the unit of**

- (A) Force

- (B) Work

- (C) Power

- (D) Velocity

**2. The coefficient of friction depends on**

- (A) Area of contact

- (B) Shape of surfaces

- (C) Strength of surfaces

- (D) Nature of surface

**3. In a framed structure, as shown in the below figure, the force in the member**

*AB*is __________ the force in member*AC*.- (A) Half

- (B) Equal to

- (C) Double

- (D) None of
these

**4. The velocity ratio of a single purchase crab winch can be increased by**

- (A) Increasing
the length of the handle

- (B) Increasing
the radius of the load drum

- (C) Increasing
the number of teeth of the pinion

- (D) All of the
above

**5. Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the balls with velocity ‘**

*v’*is made to strike the second ball. Both the balls after impact will move with a velocity- (A)

*v*

- (B)

*v*/2

- (C)

*v*/4

- (D)

*v*/8

**6. Moment of inertia of a circular section about an axis perpendicular to the section is**

- (A)

*πd*16

^{3}/- (B)

*πd*32

^{3}/- (C)

*πd*32

^{4}/- (D)

*πd*64

^{4}/**7. A redundant frame is also called __________ frame.**

- (A) Perfect

- (B) Imperfect

- (C) Deficient

- (D) None
of these

**8. Tension in the cable supporting a lift is more when the lift is moving __________ with an acceleration.**

- (A) Upwards

- (B) Downwards

- (C) Horizontal

- (D) None
of these

**9. The unit of work in S.I. units is**

- (A) Newton

- (B) erg

- (C) kg-m

- (D) joule

**10. If the gravitational acceleration at any place is doubled, then the weight of a body will be**

- (A)

*g*/2

- (B)

*g*

- (C)

*√*2.

*g*

- (D) 2

*g*

**11. The moment of inertia of a sphere of mass '**

*m'*and radius '*r'*, about an axis tangential to it, is- (A) 2

*mr*

^{2}/3

- (B) 2

*mr*

^{2}/5

- (C) 7

*mr*

^{2}/3

- (D) 7

*mr*

^{2}/5

**12. The center of gravity of a quadrant of a circle lies along its central radius (**

*r*) at a distance of- (A) 0.5

*r*

- (B) 0.6

*r*

- (C) 0.7

*r*

- (D) 0.8

*r*

**13. The unit of moment of inertia of an area is**

- (A) kg-m

^{2}

- (B) kg-m-s

^{2}

- (C) kg/m

^{2}

- (D) m

^{4}

**14. When a body of mass moment of inertia '**

*I'*(about a given axis) is rotated about that axis with an angular velocity to, then the kinetic energy of rotation is- (A)

*I*ω

- (B)

*I*ω

^{2}

- (C) 0.5

*Iω*

- (D) 0.5

*Iω*

^{2}**15. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is**

- (A) 50

- (B) 100

- (C) 200

- (D) 400

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