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{\t3r qo9) +{ z o 3t 4 b"2 dYKlq u0VIBKANT ACADETTY(India) Private Limited PT'YS'GSIRP Quiz-|Ta rget I T ADUA N C E-2O1 gDATE : 02/05/2013 TIME:45 MIN.Modern, Error and Fluid

Single Ghoice Question :1 . A balloon of volume 1 500 m3 and weighing 1 650 kg with all its equipment is filled with helium of density = 9.2kg/m3. Density of air = 1 .3 kg/m3. The tension in a vertical rope tied to the balloon to keep it stationary will beabout

(A) 300 kg (B) 1450 ksA thin plastic rod of density 0.5 g/cc has a total mass 200 g and length 4 m. A tiny metallic weight of mass300 g is fixed at its bottom and the rod is lowered completely in water, while still holding its upper end thattouches the water surface. The stress in the rod is zero at a point whose distance from its lower end is(neglecting atmosphere pressure).(A) 2.5 m (B) 1.33 m 2.0 m (D) 3.0 m

3. Two identical cylinders have a hole of radius a (a

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A particle moves in a closed orbit around the origin, due to a force which is directed towards the origin. Thede Broglie wavelength of the particle varies cyclically between two values 1..,, 1,, with Lt , Lz. Which of thefollowing statement are true ?(A) The particle could be moving in a circular orbit with origin as centre

The particle could be moving in an elliptic orbit with origin as its focus.(C) When the de Boglie wave length is 1,,, the particle is nearer the origin than when its value is l"r.\Z/Wnen the de Broglie wavelength is l.r, the particle is nearer the origin than when its vatue is tr..

Subjective :7. With respect to significant figures find the value of (All numbers are measurement)(a) f! (b).6

8' The pitch of a screw gauge is 0.5 mm & there are 1 00 divisions on circular scale. There is no zero error thenfind the reading as shown in figurego'

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\' s( f2leV't.s 3x> 0-(r^rD9. Free neutrons have a decay constant of 1,10 x 10-3 s-1. lf the de Broglie wavelength of the neutrons in afrom the source where the beam intensity has dropped to half

sition to a lower state without emitting a photon. The excesshich may be ejected by the atom. (This is called an Augersive, calculate the kinetic energy of an n = 4 Auger electrony from a n = 2to n = 1 transition. As there is a single valenceght of as given by the Bohr model. The energy of the nth stateEn=-Z2R 1-n' where R is the Ryberg constant andZ= 24.lf 3% of the energy supplied to an incandescent lamp is radiated as visible light, how many visible quanta are1.

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