Applied Mechanics and Graphic Statics

181. On a ladder resisting on a smooth ground and leaning against a rough vertical wall, the force of friction acts

1. Towards the wall at its upper end
2. Away from the wall at its upper end
3. Upwards at its upper end
4. Downwards at its upper end

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182. On a ladder resting on a rough ground and leaning against a smooth vertical wall, the force of friction acts

1. Downwards at its upper end
2. Upwards at its upper end
3. Perpendicular to the wall at its upper end
4. Zero at its upper end

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183. On a mass 'm' describing a circular path of radius 'r', the centrifugal force

1. Acts tangentially to the circular path
2. Acts towards the centre of rotation
3. Acts away from the centre of rotation
4. Is mw^2r/g kgf

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184. One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The reaction between the sphere and the wall of the arrangement made is

1. 102.5 kg
2. 105.5 kg
3. 108.5 kg
4. 110 kg

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185. One end of a light string 4 m in length is fixed to a point on a smooth wall and the other end fastened to a point on the surface of a smooth sphere of diameter 2.25 m and of weight 100 kg. The tension in the string is

1. 17.5 kg
2. 19.5 kg
3. 22.5 kg
4. 25 kg

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186. One end of an elastic string of natural length / and modulus X is kept fixed while to the other end is attached a particle of mass m which is hanging freely under gravity. The particle is pulled down vertically through a distance x, held at rest and then released. The motion is

1. A simple harmonic motion
2. A rectilinear motion with constant speed
3. A damped oscillatory motion
4. None of the above

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187. One half of a vibration of a body, is called

1. Period time
2. Oscillation
3. Beat
4. Amplitude

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188. One Joule is equivalent to

1. 9.81 Newton metre
2. 1 Newton metre
3. 1 kg wt metre
4. 1 dyne metre

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189. One Newton force, is

1. 10³ dynes
2. 10⁴ dynes
3. 10⁵ dynes
4. 10⁶ dynes

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190. One Newton is equivalent to

1. 1 kg. wt
2. 9.81 kg. wt
3. 981 dyne
4. 1/9.81 kg. wt

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