# Practice Test: Question Set - 12

**1. Which one of the following statements is not correct?**

- (A) The tangent of the
angle of friction is equal to coefficient of friction

- (B) The angle of repose
is equal to angle of friction

- (C) The tangent of the
angle of repose is equal to coefficient of friction

- (D) The sine of the angle
of repose is equal to coefficient to friction

**2. 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

**3. If ‘**

*P’*is the force acting on the body, ‘*m’*is the mass of the body and ‘*a’*is the acceleration of the body, then according to Newton's second law of motion,- (A)

*P*+

*m.a*= 0

- (B)

*P*-

*m.a*= 0

- (C)

*P*×

*m.a*= 0

- (D)

*P*/

*m.a*= 0

**4. 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

**5. The horizontal range of a projectile (**

*R*) is given by- (A)

*R = u² cos*2

*α/g*

- (B)

*R = u² sin*2

*α/g*

- (C)

*R = u² cosα/g*

- (D)

*R = u² sinα/g*

**6. A block of mass 20 kg lying on a rough horizontal plane is connected by a light string passing over a smooth pulley to another mass 5 kg, which can move freely in the Vertical direction, as shown in the below figure. The tension in the string will ___________ with the increase in coefficient of friction.**

- (A) Increase

- (B) Decrease

- (C) Not
be effected

- (D) None
of these

**7. Coplanar non-concurrent forces are those forces which __________ at one point, but their lines of action lie on the same plane.**

- (A) Meet

- (B) Do not meet

- (C) Either ‘A’
or ‘B’

- (D) None
of these

**8. Which of the following do not have identical dimensions?**

- (A) Momentum and impulse

- (B) Torque and energy

- (C) Torque and work

- (D) Moment of a force and
angular momentum

**9. In order to determine the effects of a force, acting on a body, we must know**

- (A) Magnitude
of the force

- (B) Line
of action of the force

- (C) Nature
of the force i.e. whether the force is push or pull

- (D) All
of the above

**10. A framed structure is perfect, if the number of members are __________ (2**

*j*- 3), where*j*is the number of joints.- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) None
of these

**11. The ratio of limiting friction and normal reaction is known as**

- (A) Coefficient of
friction

- (B) Angle of friction

- (C) Angle of repose

- (D) Sliding friction

**12. The bodies which rebound after impact are called**

- (A) Inelastic
bodies

- (B) Elastic
bodies

- (C) Neither
elastic nor inelastic bodies

- (D) None
of these

**13. The velocity of a particle (**

*v*) moving with simple harmonic motion, at any instant is given by (where,*r*= Amplitude of motion, and*y*= Displacement of the particle from mean position.)- (A)

*ω.√(y² - r²)*

- (B)

*ω.√(r² - y²)*

- (C)

*ω².√(y² - r²)*

- (D)

*ω².√(r² - y²)*

**14. If n = number of members and y = number of joints, then for a perfect frame, n = ?**

- (A) 1/2

- (B) 2/3

- (C) 3/2

- (D) 2/4

**15. A framed structure is imperfect, if the numbers of members are __________ (2**

*j*- 3).- (A) Equal to

- (B) Less than

- (C) Greater than

- (D) Either (B)
or (C)

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