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261.

The x coordinate of the centroid of the area enclosed by the parabolas y = x2 and x = y2 will be

A.	0.43	B.	0.44
C.	0.45	D.	0.46

262.

If three non-parallel forces hold a rigid body in equilibrium, they must

A.	be equal in magnitude	B.	be concurrent
C.	be non-coneurrent	D.	be colinear

263.

A truss element

A.	is a two-force body	B.	is a three force body
C.	resist forces in compression only	D.	resists lateral forces

264.

The y-coordinate of the centroid of the area bounded by the x-axis, the line x = 3 and the parabola y = x2 will be

A.	2.7	B.	2.65
C.	2.6	D.	2.55

265.

Which of the following could be the unit of rotational inertia of a body in CGS system?

A.	gm-cm2	B.	gm-cm4
C.	cm4	D.	kg-cm2

266.

In case forces of 1 N, 2 N, 3 N, 4 N, 5 N and 6 N act in order along the sides of a regular hexagon, the resultant will be

A.	0	B.	2 N
C.	6 N	D.	21 N

267.

A beam fixed at both ends with a central load W in the middle will have zero bending moment at

A.	one place	B.	two places
C.	three places	D.	no where

268.

Our weight will be zero under all of the following conditions EXCEPT

A.	When we are ascending in a lift with acceleration of 4.9 m/s2	B.	When we are freely faling
C.	We are orbiting in a satellite	D.	We are at the centre of the earth

269.

A man is standing near the edge of a uniformly rotating platform about an axis passing through its centre. The speed of rotation of the platform will decrease if he

A.	moves towards the axis of rotation	B.	accepts a heavy bag from one of his friends standing near by and holds it in his hand
C.	extends his arms outwards	D.	jumps out from the platform

270.

A wheel accelerates from rest with an acceleration of 6 rad/sec2. How many revolutions are experienced in 4 seconds?

A.	7.64	B.	9.82
C.	12.36	D.	25.6