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Flame SCF 18 Near Chawla Lights Ph-7 Mohali 9888949978

67. When a weight of 10 kg is suspended from a copper wire of length 3 metres and diameter 0.4 mm, its length increases by 2.4 cm. If the diameter of the wire is doubled, then the extension in its length will be

(a) 9.6 cm (b) 4.8 cm

(c) 1.2 cm (d) 0.6 cm

Answer-d

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PrevPrevious154. A disc of radius R is made to oscillate about a horizontal axis passing through its periphery. Its time period would be

Next69. Two wires ‘A’ and ‘B’ of the same material have radii in the ratio 2 : 1 and lengths in the ratio 4 : 1. The ratio of the normal forces required to produce the same change in the lengths of these two wires isNext

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