Strength of Materials
The resultant of the following three couples 20 kg force, 0.5 m arm, + ve sense 30 kg force, 1 m arm, – ve sense 40 kg force, 0.25 m arm, + ve sense having arm of 0.5 m will be

20 kg, - ve sense
20 kg, + ve sense
10 kg, + ve sense
10 kg, - ve sense

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Strength of Materials
The weight of a body is due to

centripetal force of earth
gravitational pull exerted by the earth
gravitational force of attraction towards the centre of the earth.
force of attraction experienced by par-ticles

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