# Online Study Materials on Graphic Statics – Set 12

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## Q1. A particle is dropped from the top of a tower 60 m high and another is projected upwards from the foot of the tower to meet the first particle at a height of 15.9 m. The velocity of projection of the second particle is

(A) 16 m/sec
(B) 18 m/sec
(C) 20 m/sec
(D) 22 m/sec

Answer: (C) 20 m/sec

## Q2. If a body is lying on a plane whose inclination with the horizontal is less than the angle of friction, then?(i) A force is required to move the body upwards(ii) A force is required to move the body downward(iii) The body will not be in equilibriumThe correct answer is

(A) Only (i)
(B) Only (ii)
(C) Both (i) and (ii)
(D) Both (i) and (iii)

Answer: (C) Both (i) and (ii)

## Q3. The characteristic of a couple is:

(A) Algebraic sum of forces, constituting a couple is zero
(B) Algebraic sum of moments of forces, constituting a couple, about any point, is same
(C) A couple can be never the balanced by a single force
(D) All the above

Answer: (D) All the above

## Q4. Maximum efficiency of a screw jack for the angle of friction θ, is

(A) sin θ/(1 + sin θ)
(B) (1 – sin θ)/sin θ
(C) (1 + sin θ)/(1 – sin θ)
(D) (1 – sin θ)/(1 + sin θ)

Answer: (D) (1 – sin θ)/(1 + sin θ)

## Q5. The acceleration of a particle moving along the circumference of a circle with a uniform speed, is directed

(B) Tangentially at that point
(C) Away from the centre
(D) Towards the centre

Answer:(B) Tangentially at that point

(A) P
(B) P√2
(C) P/√2
(D) 2P

(A) ED
(B) DC
(C) BC
(D) BD

## Q8. Work may be defined as

(A) Force × distance
(B) Force × velocity
(C) Force × acceleration
(D) None of these

Answer: (A) Force × distance

(A) ½ sec
(B) 1 sec
(C) 1.2 sec
(D) 1.5 sec

(A) Zero
(B) Maximum
(C) Minimum
(D) Varying

## Q11. Pick up the correct statement from the following for the structure shown in below figure.

(A) The horizontal reaction at A is 2 √3t ←
(B) The horizontal reaction at C is 2 √3t →
(C) The vertical reaction at A is zero
(D) All the above

Answer: (D) All the above

## Q12. Which one of the following statements is true?

(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) All the above

Answer: (D) All the above

## Q13. If two equal forces of magnitude ‘P’ act at an angle ‘θ’, their resultant, will be

(A) P cos θ/2
(B) 2P sin θ/2
(C) P tan θ/2
(D) 2P cos θ/2

Answer: (D) 2P cos θ/2

(A) 3/4
(B) 4/5
(C) 5/3
(D) 3/5

(A) 50
(B) 55
(C) 60
(D) 65