Download NEET-UG 2013 Answer Key (Code - X) - Bansal Classes

Q.140 The wettabilityof a surface byaliquid dependsprimarilyon:(1) surface tension(2) density(3) angle of contact between the surface andtheliquid(4) viscosityAns. 3Q.141 The condition under which a microwave ovenheatsupafooditemcontainingwatermoleculesmostefficientlyis:(1) The frequency of the microwaves has norelation with natural frequency of watermolecules.(2) Microwaves are heat waves, so alwaysproduce heating.(3) Infra-red waves produce heating in amicrowave oven.(4) The frequency of the microwaves mustmatch the resonant frequency of the watermolecules.Ans. 4Q.142 Agas is taken through the cycleA B CA, as shown. What is the net work done bythe gas ?5 67 432105P(10 Pa)2 4 6 8–3 3V(10 m )(1) 1000 J (2) zero(3) –2000 J (4) 2000 JAns. 1Q.143 A wire loop is rotated in a magnetic field. thefrequencyofchangeofdirectionoftheinducede.m.f. is(1) twice per revolution(2) four times per revolution(3) six times per revolution(4) once per revolutionAns. 4Q.144 The velocityofaprojectile at theinitial pointAis ( 2î 3ĵ)m/s.Its velocity(in m/s)at point Bis:Ans. 2YA(1) 2î 3ĵ(2) 2î 3ĵ(3) 2î 3ĵ(4) 2î 3ĵQ.145 The followingfour wires are made of the samematerial. Which of these will have the largestextension when the same tension is applied ?(1) length = 100 cm, diameter = 1 mm(2) length = 200 cm, diameter = 2 mm(3) length = 300 cm, diameter = 3 mm(4) length = 50 cm, diameter = 0.5 mmAns. 4Q.146 A wire of resistance 4 is stretched to twiceits original length. The resistance of stretchedwire would be :(1) 4 (2) 8(3) 16 (4) 2Ans. 3BX