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Unformatted text preview: 08 - SOLIDS AND FLUIDS Page 1 ( Answers at the end of all questions ) 1 ) If S is stress and Y is Youngs modulus of material of a wire, the energy stored in the wire per unit volume is ( a ) S 2 / ( 2Y ) ( b ) 2 S 2 Y ( c ) S / 2Y ( d ) 2Y / S 2 [ AIEEE 2005 ] 2 ) A 20 cm long capillary tube is dipped in water. The water rises upto 8 cm. If the entire arrangement is put in a freely falling elevator, the length of water column in the capillary tube will be ( a ) 10 cm ( b ) 8 cm ( c ) 20 cm ( d ) 4 cm [ AIEEE 2005 ] 3 ) A wire fixed at the upper end stretches by length l by applying a force F. The work done in stretching is ( a ) F / 2l ( b ) Fl ( c ) 2 Fl ( d ) Fl / 2 [ AIEEE 2004 ] 4 ) Spherical balls of radius R are falling in a viscous fluid of viscosity with a velocity v. The retarding viscous force acting on the spherical ball is ( a ) directly proportional to R but inversely proportional to v ( b ) directly proportional R and velocity v ( c ) inversely proportional to both radius R and velocity v. ( d ) inversely proportional to R but directly proportional to velocity v [ AIEEE 2004 ] 5 ) If two soap bubbles of different radii are connected by a tube ( a ) air flows from the bigger bubble to the smaller bubble till sizes become equal ( b ) air flows from the bigger bubble to the smaller bubble till the sizes are interchanged ( c ) air flows from the smaller bubble to the bigger ( d ) there is no flow of air [ AIEEE 2004 ] 6 ) A wire suspended vertically from one of its ends is stretched by attaching a weight of 200 N to the lower end. The weight stretches the wire by 1 mm. The elastic energy stored in the wire is ( a ) 0.1 J ( b ) 0.2 J ( c ) 10 J ( d ) 20 J [ AIEEE 2003 ] 7 ) A spring of spring constant 5 10 3 N / m is stretched initially by 5 cm from the unstretched position. The work required to stretch it further by another 5 cm is ( a ) 6.25 Nm ( b ) 12.50 Nm ( c ) 18.75 Nm ( d ) 25.00 Nm [ AIEEE 2003 ] 8 ) Rain drops are spherical in shape because of ( a ) surface tension ( b ) capillarity ( c ) downward motion ( d ) acceleration due to gravity [ AIEEE 2002 ] 9 ) Which of the following affects the elasticity of a substance ?...
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- Spring '06
- Energy, Orders of magnitude