MUDRA PHYSICAL SCIENCES

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1 Physical Scincs For ET & SET Exams. Of UGC-CSIR MUDRA PHYSICAL SCIECES VOLUME-05 PART B & C MODEL QUESTIO BAK FOR THE TOPICS: 7. Exprimntal Tchniqus and Data Analysis UIT-I UIT-II 5 UIT-III 9 8. Atomic and Molcular Physics UIT-I 57 UIT-II 75 0

2 Physical Scincs For ET & SET Exams. Of UGC-CSIR 7. Exprimntal Tchniqus & Data Analysis UIT-I. Singl ndd pr-rcording systms is a) Dolby HX b) Dolby SR c) DR d) CEDAR. What is th significant numbr of th valu ? a) b) 3 c) 6 d) 7 3. Accuracy cannot b dtrmind by th mthod? a) Absolut b) Comparativ c) Minimal d) on of ths 4. For a st of xprimntal data th standard dviation is dtrmind to b.5. Thus th man dviation would b approximatly a). b) 3. c) 4. d). 5. Th principl of Pirani gaug is basd on a) Humidity of th mdium b) Thrmal conductivity of th mdium c) Combustibility of th mdium d) on of ths 6. Which amongst th following divids th frquncis in four qual parts and thy ar dnotd by Q, Q, Q3. Whr Q is sam as th mdian? a) Avrag b) Mod c) Quartils d) on of ths 7. Two sts of xprimnts hav quivalnt absolut rrors but th numbr of masurmnts takn ar diffrnt. Thus thy would hav a) Equivalnt standard b) Equivalnt man dviations c) Equivalnt varianc d) on of ths 8. A diffrntiator is rarly usd in analog computrs bcaus a) It rducs th gain b) It dcrass th output of th amplifir c) It amplifirs nois, drift and othr unwantd disturbancs d) on of ths 9. σ can b valuatd with adquat prcision from practical purpos from th quation a). 5 da b). 5 da c). 45 d). 45

3 Physical Scincs For ET & SET Exams. Of UGC-CSIR 0. Th rrors involvd in photomtric masurmnts ar of th ordr of a) % b) -5% c) 0-0% d) 40-50%. A Hall ffct transducr can b usd for masurmnt of a) Powr b) Elctric currnt c) Displacmnt d) All of ths. A cadmium sulphid cll has th highst rspons for a light of wavlngth of narly a) 300 nm b) 800 nm c) 500 nm d) 600 nm 3. Th ffctiv rsistanc of a coil at high frquncis is mor than its d.c. rsistanc on account of a) Skin ffcts b) Proximity ffct c) Eddy currnt losss d) All of th abov 4. If O rprsnt obsrvd valu and T rprsnt th masur valu thn th absolut rror is rprsntd by a) O T b) T O c) O T d) T O 5. Th gaug factor is dfind as R L a) R R R D c) R D b) d) R L L R R R 6. A light sourc may b considrd as a point sourc if its diamtr is a) Lss than 0% of th distanc btwn it and th dtctor b) Lss than % of th distanc btwn it and th dtctor c) Mor than 0% of th distanc btwn it and th dtctor d) Mor than % of th distanc btwn it and th dtctor 7. A voltag signal t has th following Fourir transform: V j 0 jt for for Th nrgy that would b dissipatd in a Ω rsistor fd from t is d a) Jouls b) Jouls c) d) Jouls

4 Physical Scincs For ET & SET Exams. Of UGC-CSIR 8. If P < 0.05, th lvl of significanc is a) 5% b) 50% c) 0.05% d) 0.50% 9. Th most common typ of scintillation matrials a) Gass b) Inorganic crystals c) Liquids d) Plastics 0. Radiation pyromtrs ar usd in tmpratur rang of a) C b) C b) C d) C. Th rat of dposition of positiv chargs in an ionization chambr is masurd by a) Quadrant lctromtr b) Voltmtr c) Ammtr d) on of ths. Kping all th paramtr sam if th standard dviation is doubld, varianc would b a) o ffct b) Doubld c) Quadrupld d) Halvd 3. Which of th following instrumnt can b usd for masuring th xpansion of bodis by hat? a) Thrmomtr b) Thrmocoupl c) Diffrntial air thrmoscop d) Pyromtr 4. Th tmpratur transducrs xhibit non-linar bhaviour. Th ordr in which thy xhibit nonlinarity (highst to lowst) is a) Thrmocoupls, RTD, thrmistors b) Thrmistors, thrmocoupls, RTDs, c) RTDs, thrmocoupls, thrmistors d) Thrmistors, RTDs, thrmocoupls 5. Thr typs of tmpratur transducrs ar compard as rgards thir snsitivity. Th ordr in which thy xhibit thir snsitivitis (highst to lowst) is a) Thrmistors, RTDs, thrmocoupls b) Thrmocoupls, RTDs, thrmistors c) RTDs, Thrmistors, thrmocoupls c) RTDs, thrmocoupls, thrmistors 6. Th tru valu of flux dnsity in a ring spcimn is a) B A c B' A b) A s c B B' As c) B A s B' A d) A c s B B' Ac whr B = Masurd valu of flux dnsity H = Magntizing forc, A S = Ara of cross sction of spcimn, A C = Ara of cross sction of coil producing magntizing forc 3

5 Physical Scincs For ET & SET Exams. Of UGC-CSIR 7. Th spctral dnsity of whit nois is a) Exponntial b) Uniform c) Poisson d) Gaussian 8. In th gnration of modulatd signal, a varactor diod can b usd for a) FM gnration only b) AM gnration only c) PM gnration only d) Both AM and PM gnration 9. For a modratly skw distribution, th mod is calculatd by th mpirical formula. a) Mod = 3 (Man Mdian) b) Mod = Man Mdian c) Mod = 3 Man Mdian d) Mod = 3 Mdian Man 30. In cas a signal band limitd to f m is sampld at a rat lss than f m, th constructd signal will b a) Distortion lss b) Small in amplitud c) Having highr frquncis supprssd d) Distortd 3. Which of th following dmodutor(s) can b usd for dmodulating th signal xt 5 cos 000t cos 000t? a) Envlop dmodulator b) Squar-law dmodulator c) Synchronous dmodulator d) All of ths 3. Mathmatically standard dviation is rprsntd by x a) b) x i x c) i x d) x i x x i x 33. If th numbr of obsrvation in two group b n and n with man m and m rspctivly and if th two groups ar combind thn man m of th combind group is givn by nm nm nm nm a) m b) m n m m m nm nm nm nm c) m d) m n n m m 34. Input auto-corrlation function is 0 j t Rnn d, thn output powr spctral dnsity will b 0 0 a) b) c) 0 4 d) 0

6 Physical Scincs For ET & SET Exams. Of UGC-CSIR 35. Inductanc is masurd by a) Win bridg b) Schring bridg c) Maxwll s bridg d) Hay bridg 36. Th impuls rspons of a filtr, matchd to a rctangular puls is a) An attnuator b) A low pass filtr c) A high pass filtr d) An qualizr 37. Which of th following instrumnt can b usd for dtcting hat rays? a) Radiomtr b) Thrmomtr c) Thrmopil d) Pyromtr 38. Which of th following photolctric dvics is usd for production of lctrical nrgy by convrting solar nrgy? a) Photo missiv cll b) Photo-diod c) Photo transistor d) Both (b) and (c) 39. Th probability of dnsity function of th nvlop of a sinusoidal signal along with narrow band nois follows th following distribution a) Gaussian b) Rayligh c) Rician d) Poisson 40. p / can also b givn as a) n / b) n / c 0 n / d) on of ths 4. If t GF g rprsnts a Fourir transform pair, thn according to th dually proprty of Fourir transform a) Gt g f b) G t g * f t g f G t g * f c) G d) 4. Th minimum valu of m f for an FM systm rquird to produc a noticabl improvmnt in 5/ ratio ovr a comparabl AM systm with m is a) 3 b) c) d) 3 Continud on: Pag 6 onwards 5