Mathematics Science Awareness Question Paper PDF

SECTION–A 1. Two cantilever beams are of equal length. One carries 1. nks çkl /kj.kksa dh yEckbZ leku gSA ,d leku :i ls forfjr Hkkj a uniformly distributed load and other carries same ogu djrh gS vkSj nwljh Hkh ogh Hkkj ogu djrh gS fdUrq og Hkkj load but concentrated...

SECTION–A 1. Two cantilever beams are of equal length. One carries 1. nks çkl /kj.kksa dh yEckbZ leku gSA ,d leku :i ls forfjr Hkkj a uniformly distributed load and other carries same ogu djrh gS vkSj nwljh Hkh ogh Hkkj ogu djrh gS fdUrq og Hkkj load but concentrated at the free end. The ratio of eqä fljs ij ladsfUær gSA vf/kdre fo{ksi vuqikr gS% maximum deflections is: (A) 5/6 (B) 2/3 (A) 5/6 (B) 2/3 (C) 1/2 (D) 1/3 (C) 1/2 (D) 1/3 2. For steel, the ultimate strength in shear as compared 2. bLikr ds fy,] ruko esa pje lkeF;Z dh rqyuk esa vi:i.k esa pje to ultimate strength in tension is: lkeF;Z gksrh gS% (A) Same (B) 1 / 2 (A) ogh (B) 1/2 (C) 1 / 3 (D) 2 / 3 (C) 1/3 (D) 2/3 3. A cantilever beam is deflected by δ due to load P. If 3. Hkkj P ds dkj.k ,d izkl/kj.k δ }kjk fo{ksfir dh tkrh gSA ;fn length of beam is doubled, the deflection compared to /kj.k dh yEckbZ nqxuh dj nh tk,] rks izFke fLFkfr dh rqyuk esa earlier case will be changed by a factor of: fo{ksi.k buesa ls fdl dkjd ls ifjofrZr gks tk,xk% (A) 2 (B) 1/2 (A) 2 (B) 1/2 (C) 1/8 (D) 8 (C) 1/8 (D) 8 4. 6 cm diameter and 20 cm long work piece rotates at 4. 6 lsaVhehVj O;kl vkSj 20 lsaVhehVj yack d`R;d 200 rpm dh xfr 200 rpm. Axial feed is 0.1 mm per revolution. The time ls ?kwerk gSA v{kh; Hkj.k 0.1 mm izfr Qsjk gSA e”khuu esa yxus taken to machining is okyk le; gS% (A) 6 minutes (A) 6 feuV (B) 20 minutes (B) 20 feuV (C) 10 minutes (C) 10 feuV (D) None of these (D) buesa ls dksbZ ugha 5. A body is pulled up on an inclined plane of inclination 5. 20° vkufr ds vkur ry ls {kSfrt esa ,d fiaM dks [khapk tkrk gSA 20° to the horizontal. The angle of friction between the fiaM vkSj ry ds chp ?k"kZ.k dk dks.k 17° gSA ry ij fiaM dks [khpusa body and the plane is 17°. The force required to pull ds fy, okafNr cy rc U;wure gksrk gS tc bls buesa ls fdl fMxzh the body up the plane is minimum when it is applied: dks.k ij ykxw fd;k tkrk gS% (A) At angle of 20° to the plane (A) ry ls 20° dks.k ij (B) At angle of 17° to the plane (B) ry ls 17° dks.k ij (C) In the horizontal direction (C) {kSfrt fn'kk esa (D) Along the plane (D) ry ds lkFk 6. A body has an intitial velocity of 2m/s. It moves with an 6. ,d fiaM dk vkjfEHkd osx 2 ehVj çfr lsds.M gSAmldh Roj.k dh acceleration of 4 m/s2. Its velocity after 5 seconds will nj 4 m/s2 gSA 5 lsds.M ckn bldk osx gksxk% be: (A) 22 [email protected] (A) 22 m/s (B) 32 [email protected] (B) 32 m/s (C) 42 [email protected] (C) 42 m/s (D) 20 [email protected] (D) 20 m/s 7. An appliance is marked 500 W. At 220 V, it consumes 3 7. ,d ¼oS|qr½ lkf/k= ij 500 okWV fy[kk gSA 220 oksYV ij ;g 3 ,fEi;j ampers of current. The power factor is approximately: /kkjk dh [kir djrk gSA 'kfä xq.kd buesa ls fdlds lfUudV gksxk% (A) 0.857 (B) 0.812 (A) 0.857 (B) 0.812 (C) 0.757 (D) 0.660 (C) 0.757 (D) 0.660 8. Pure silicon at zero K is: 8. 'kwU; K ij 'kq) flfydkWu gS% (A) An intrinsic semiconductor (A) ,d uSt v)Zpkyd (B) An extrinsic semiconductor (B) ,d vuSt v)Zpkyd (C) A metal (C) ,d /kkrq (D) An insulator (D) ,d fo|qrjks/kh Mechanical 9. A circular plate of 3 m diameter is immersed vertically 9. 3 ehVj O;kl dh ,d o`Ùkkdkj IysV ikuh ds uhps 20 ehVj dh with its centroid at a depth of 20 m below water. xgjkbZ ij vius dsUæd ds lkFk Å/okZ/kj fuefTtr gksrh gSA ,slh gh Another similar plate is lying horizontally at a depth of ,d vU; IysV 20 ehVj dh xgjkbZ ij {kSfrt iM+h gSA {kSfrt IysV 20 m. The total force on the horizontal plate will be: ij dqy cy gksxk% (A) More than the force on the vertical plate (A) Å/okZ/kj IysV ij iM+ jgs cy ls vf/kd (B) Less than the force on the vertical plate (B) Å/okZ/kj IysV ij iM+ jgs cy ls de (C) Same as on the force on the vertical plate (C) Å/okZ/kj IysV ij iM+ jgs cy ds cjkcj (D) None of these (D) buesa ls dksbZ ugha 10. Two circular solid shafts of diameters 4 cm and 6 cm 10. Øe'k% 4 ls-eh- vkSj 6 ls-eh- O;kl dh nks o`Ùkkdkj Bksl 'ks¶V respectively transmit same power at the same speed. leku xfr ij leku 'kfä lapkfjr djrh gSA 4 ls-eh- O;kl okyh The maximum shear stress in the 4 cm diameter shaft 'ks¶V esa vf/kdre vi:i.k cy 50 MPa gSA 6 ls-eh- O;kl okyh is 50 MPa. The maximum shear stress in the 6 cm 'ks¶V esa vf/kdre vi:i.k cy buesa ls fdlds lfUudV gksxk% diameter shaft will be approximately: (A) 50 MPa (B) 168.75 MPa (A) 50 MPa (B) 168.75 MPa (C) 15 MPa (D) buesa ls dksbZ ugha (C) 15 MPa (D) None of these 11. In a process the final pressure and volume of a fixed 11. ,d çØe esa vkn'kZ xSl dk fu;r æO;eku vfUre nkc vkSj vk;ru mass of an ideal gas are twice that of its initial blds çkjfEHkd nkc vkSj vk;ru dk nqxuk gksrk gSA ;fn xSl dk pressure and volume. If the initial temperature of the çkjfEHkd rkieku 27°C gks rks °C esa bldk vfUre rkieku gksxk% gas is 27°C, its final temperature in °C would be: (A) 54 (B) 108 (A) 54 (B) 108 (C) 927 (D) 1200 (C) 927 (D) 1200 12. Two helical gears of the same hand and a 45° helix 12. tkyh esa ,d gh gkFk ls nks dqaMfyuh fx;j vkSj 45° dk ,d gsfyDl angle are in mesh. The shaft of the two gears would dks.k gS] nks fx;jksa ds 'kS¶V fuEufyf[kr esa ls çR;sd fdl dks.k esa gksaxs be at following angle to each: (A) 45° (B) 90° (A) 45° (B) 90° (C) 22½° (D) fdlh Hkh dks.k esa gks ldrs gSa (C) 22½° (D) Could be at any angle 13. Two equal forces of magnitude 10 Newton act at an 13. 10 U;wVu okys vkdkj ds nks leku cy 90° ds dks.k ij dk;Z djrs angle of 90°. Their resultant is equal to: gSaA mudk ifj.kkeh fdlds cjkcj gksxk% (A) 10 N. (B) 10.√2 N. (A) 10 N. (B) 10.√2 N. (C) 10.√3 N. (D) 20 N. (C) 10.√3 N. (D) 20 N. 14. A shaft is driven with the help of a belt, which is 14. ,d 'ks¶V dks ,d iês dh lgk;rk ls pyk;k tkrk gS tks batu vkSj passing over the engine and shaft. The engine is 'ks¶V ds Åij ls xqtjrh gSA batu 200 rpm ij py jgk gSA batu running at 200 rpm. The diameters of engine pulley is iqyh dk O;kl 51 lseh- vkSj 'ks¶V dk 30 lseh- gSA 'ks¶V dh xfr 51 cm and that of shaft is 30 cm. The speed of the gksxh% shaft will be: (A) 200 rpm (B) 300 rpm (A) 200 rpm (B) 300 rpm (C) 340 rpm (D) 400 rpm (C) 340 rpm (D) 400 rpm 15. A perfect gas is heated at constant pressure. The final 15. ,d iw.kZ xSl dks vpj nkc ij Åf"er fd;k tkrk gSA xSl dk vfUre volume of the gas becomes 1.5 times the initial vk;ru çkjfEHkd vk;ru dk 1.5 xquk gks tkrk gSA ;fn bldk volume. If its initial temperature is 30°C, the final çkjfEHkd rkieku 30°C gS rks vfUre rkieku gksxk% temperature will be: (A) 45°C (B) 20°C (A) 45°C (B) 20°C (C) 181.5°C (D) 330°C (C) 181.5°C (D) 330°C 16. A cantilever 9 m long has uniformly distributed load 16. 9 ehVj yEch ,d çkl leLr yEckbZ ij ,d leku Hkkj forfjr over the entire length. The maximum bending moment djrh gSA vf/kdre cadu vk?kw.kZ 8100 N-m gS rks Hkkj.k nj gksxh% is 8100 N-m, the rate of loading is: (A) 200 N/m (B) 100 N/m (A) 200 N/m (B) 100 N/m (C) 400 N/m (D) 900 N/m (C) 400 N/m (D) 900 N/m Mechanical 17. A gear having a diameter of 40 cm transmits 10 kw at 17. 40 ls-eh- O;kl okyk ,d fx;j 250 r.p.m. ij 10 kw lapkfjr 250 r.p.m. If the pressure angle is 20°, the force on the djrk gSA ;fn nkc dks.k 20° gks rks fx;j ds nkars ij cy gksxk% tooth of the gear is: (A) 2075 N (B) 2100 N (A) 2075 N (B) 2100 N (C) 1935 N (D) 2030 N (C) 1935 N (D) 2030 N 18. An elevator weighing 1000 kg attains an upward velocity 18. 1000 fdyksxzke otu dk ,d mRFkkfi= nks lsdsUM esa leku Roj.k of 4 m/sec in two sec with uniform acceleration. The lfgr 4 ehVj çfr lsds.M Å/oZxkeh osx çkIr djrk gS rks lgk;d tension in the supporting cables will be about: dscyksa esa ruko yxHkx fdruk gksxk% (A) 1000 kg (B) 800 kg (A) 1000 Kg (B) 800 Kg (C) 1200 kg (D) 2000 kg (C) 1200 Kg (D) 2000 Kg 19. A straight teeth slab milling cutter of 100 mm diameter 19. 100 mm O;kl dk ,d lh/ks nkars okyk Lysc fefyax dVj vkSj 200 and 10 teeth rotating at 200 r.p.m. is used to remove a r.p.m. ij ?kw.kZu djus okys 10 nkars ,d bLikr NM+ ls 3 mm layer of 3 mm thickness from a steel bar. If the table eksVkbZ dh ,d ijr gVkus esa ç;ksx fd, tkrs gSaA ;fn Vscy QhM 400 feed is 400 mm/minute, the feed per tooth in this mm/feuV gS rks bl çpkyu esa çfr nkark QhM gksxh% operation will be: (A) 0.2 mm (B) 0.4 mm (A) 0.2 mm (B) 0.4 mm (C) 0.5 mm (D) 0.6 mm (C) 0.5 mm (D) 0.6 mm 20. Two mating spur gears have 25 teeth and 75 teeth. The 20. nks esyh Lij fx;jksa esa 25 vkSj 75 nk¡r gSaA xjkjh 1260 rpm ij pinion rotates at 1260 rpm. What is the rotational ?kwerh gSA fx;j dh ?kw.kZu xfr D;k gS% speed of gear? (A) 1260 rpm (B) 1060 rpm (A) 1260 rpm (B) 1060 rpm (C) 840 rpm (D) 420 rpm (C) 840 rpm (D) 420 rpm 21. A simply supported beam of span length 4m, carries a 21. 4 ehVj foLr`fr yEckbZ dh ,d ljy vk/kkfjr /kju e/; foLr`fr ij concentrated load of 8 kN at mid span, the value of 8 kN dk ladsfUær Hkkj ogu djrh gS rks vf/kdre cadu vk?kwZ.k dk maximum bending moment is: eku gksxk% (A) 8 kN.m (B) 16 kN.m (A) 8 kN.m (B) 16 kN.m (C) 32 kN.m (D) 128 kN.m (C) 32 kN.m (D) 128 kN.m 22. If a ball which is dropped from a height of 2.25 m on a 22. fdlh fpdus Q”kZ ij 2.25 ehVj dh Å¡pkbZ ls fxjk, tkus ij ,d smooth floor attains the height of bounce equal to 1.00 xsan 1.00 ehVj Å¡pkbZ ds cjkcj mNky ysrh gS rks xsan vkSj Q”kZ ds m, the coefficient of the restitution between the ball chp çR;oLFkku xq.kkad buesa ls fdlds cjkcj gksxk% and the floor is equal to: (A) 0.25 (B) 0.50 (A) 0.25 (B) 0.50 (C) 0.67 (D) 0.33 (C) 0.67 (D) 0.33 23. A hydraulic press has a ram of 15 cm diameter and 23. fdlh æopkfyr nkfc= dk jSe dk 15 ls-eh- dk O;kl rFkk Iytaj dk plunger of 1.5 cm. It is required to lift a weight of 1000 15 ls-eh- dk O;kl gSA bls 1000 fd-xzk- Hkkj mBkuk gSA Iyatj ij kg. The force required on the plunger is equal to: ckafNr cy buesa lsa fdlds led{k gksxk% (A) 10 kg (B) 100 kg (A) 10 fd-xzk- (B) 100 fd-xzk- (C) 1000 kg (D) 10,000 kg (C) 1000 fd-xzk- (D) 10,000 fd-xzk- 24. A body moves, from rest with a constant acceleration 24. Bgjus ds i”pkr ,d fiaM dh xfr esa 5 m/s2 dk vfojr Roj.k gksrk 2 of 5 m/s. The distance covered in 5 sec. is: gSA fiaM 5 lsds.M esa buesa ls dkSu lh nwjh r; djsxk% (A) 25 m (B) 62.5 m (A) 25 ehVj (B) 62.5 ehVj (C) 50 m (D) 125 m (C) 50 ehVj (D) 125 ehVj 25. A house requires 60 M cal/hr in winter for heating. Heat 25. lfnZ;ksa esa Å’ek ds fy, fdlh ?kj esa 60 M cal/hr dh vko”;drk pump absorbs heat from cold air outside and requires gksrh gSA Å’ek iEi ckgj dh BaMh gok ls Å’ek dk vo”kks’k.k djrk 8 M cal/hr of work. The COP will be: gS rFkk bls dk;Z ds fy, 8 M cal/hr dh vko”;drk gksrh gSA COP (A) 0.75 (B) 6.5 buesa ls D;k gksxk% (C) 7.5 (D) 15 (A) 0.75 (B) 6.5 (C) 7.5 (D) 15 Mechanical 26. A gear having 100 teeth is fixed and another gear 26. ,d fxvj 100 nk¡r okyk fLFkj gSa rFkk ,d nwljk fxvj ftlesa 25 having 25 teeth revolves around it, the centre lines of nk¡r gS blds pkjksa vksj ifjØek djrk gSA nksuksa fxvjksa dh dsUæh; both gears being joined by an arm. How many js[kk dks ,d Hkqtk ls tksM+k x;k gSA crkb;s Hkqtk ds ,d ifjØe.k ds revolution will be made by gear of 25 teeth for one fy, 25 nk¡rksa okys fxvj }kjk fdruh ifjØek,a dh tk,axh% revolution of arm: (A) 4 (B) 3 (A) 4 (B) 3 (C) 5 (D) 6 (C) 5 (D) 6 27. The magnitude of two forces, which when acting at 27. nks cyks dk ifjek.k tks tc ledks.k ij dk;Z djrk gS rks √10 Kg right angle produce resultant for of √10 Kg and when ds fy, ifj.kkeh mRiUu djrk gS vkSj tc 60° ij dk;Z djrk gS rks acting at 60° produce resultant of √13 Kg. These √13 Kg ds fy, ifj.kkeh mRiUu djrk gSA ;s cy buesa ls D;k gSa% forces are: (A) 2 rFkk √6 Kg (B) 3 rFkk 1 Kg (A) 2 and √6 Kg (B) 3 and 1 Kg (C) √5 rFkk √5 Kg (D) 2 rFkk 5 Kg (C) √5 and √5 Kg (D) 2 and 5 Kg 28. In a lathe machine back gearing arrangement is 28. [kjkn dh e”khu esa i”p fx;fjax O;oLFkk fuEu ds fy, miyC/k djkbZ provided to tkrh gS% (A) Obtain more number of speeds which are lower in (A) ,slh pky vf/kd la[;k esa çkIr djuk tks ifjek.k esa U;wu gks magnitude. (B) ,slh pky vf/kd la[;k esa çkIr djuk tks ifjek.k esa vf/kd gks (B) Obtain more number of speeds which are higher in (C) ,slh pky de la[;k esa çkIr djuk tks ifjek.k esa vf/kd gks magnitude (D) ,slh pky de la[;k esa çkIr djuk tks ifjek.k esa U;wu gks (C) Obtain less number of speeds which are higher in magnitude (D) Obtain less number of speeds which are lower in magnitude 29. Theoretically minimum possible strain while 29. “kwU; fMxzh jsd dk ç;ksx djrs gq, rU; lkexzh ds ykfEcd e”khuhdj.k orthogonal machining of a ductile material using a ds nkSjku lS)kafrd :i ls U;wure laHkkfor fod`fr gS% zero degree rake is (A) 2 (B) 0 (A) 2 (B) 0 (C) 1 (D) 90 (C) 1 (D) 90 30. A ball of mass 1kg moving with the velocity of 2m/s 30. 2m/s ds osx ls pyrk gqvk 1 fdxzk- æO;eku okyh ,d xsan 2 collide directly with another stationary ball of mass fdxzk- æO;eku okyh ,d fLFkj xsan ls çR;{kr% Vdjkrh gS ,oa vk?kkr 2kg and comes to rest after impact. The velocity of ds i”pkr~ foJke voLFkk esa vk tkrh gSA vk?kkr ds i”pkr~ nwljh xsan second ball after impact is: dk osx gS% (A) Zero (B) 0.5 m/s (A) “kwU; (B) 0.5 m/s (C) 1.0 m/s (D) 2.0 m/s (C) 1.0 m/s (D) 2.0 m/s 31. In an experiment to determine dryness fraction of 31. ok’i dh “kq’d fHkUu xq.kkad fu/kkZj.k ç;ksx esa 15 feuV esa foyfxr steam, the mass of water separated was 1.2 kg in 15 ikuh dk æO;eku 1.2 fd-xzk- rFkk mrus gh le; esa ok’i fuLlj.k minutes and the mass of steam passed out in same dk æO;eku 4.8 fd-xzk- Fkk rks “kq’d fHkUu xq.kkad gksxk% time was 4.8 kg. Dryness fraction is: (A) 40% (B) 25% (A) 40% (B) 25% (C) 50% (D) 80% (C) 50% (D) 80% 32. While orthogonal machining of a material with a tool 32. 12 fMxzh jsd ls ;qDr vkStkj ls fdlh lkexzh ds ykafcd e”khuu ds with 12 degree rake, the theoretical minimum possible nkSjku lS)kafrd U;wure laHkkfor vi:i.k lery dks.k gS% shear plane angle is: (A) 90 fMxzh (B) 45 fMxzh (A) 90 degrees (B) 45 degrees (C) 51 fMxzh (D) 12 fMxzh (C) 51 degrees (D) 12 degrees 33. Two balls of same material and finish have their 33. leku inkFkZ ,oa cuko dh nks xsanksa ftuds O;kl esa vuqikr 2:1 gS] diameters in the ratio of 2:1 and both are heated to vkSj nksuksa dks leku rki ij xeZ fd;k tkrk gS rFkk fofdj.k }kjk same temperature and allowed to cool by radiation. BaMk gksus fn;k tkrk gSA NksVs xsan ds lkis{k cM+s xsan esa “khru nj dk Rate of cooling by big ball as compared to smaller one vuqikr gksxk% ill b i th ti f Mechanical  will be in the ratio of: (A) 2 : 1 (B) 1 : 2 (A) 2 : 1 (B) 1 : 2 (C) 4 : 1 (D) 1 : 4 (C) 4 : 1 (D) 1 : 4 34. Moment of inertia of a circular area, whose diameter is 34. ,d o`Ùkh; iVy] ftldk O;kl d gS] dk blds dsUæ ls xqtjus okyh d, about an axis perpendicular to the area, passing yEcor v{k ds lkis{k tM+Ro vk?kw.kZ gksrk gS% through its centre is given by: π d4 π d4 4 4 (A) (B) πd πd 64 32 (A) (B) 64 32 π d4 π d4 (C) (D) π d4 π d4 16 24 (C) (D) 16 24 35. The velocity of a mass of 5 kg after falling a height of 5 35. fojkekoLFkk ls 5 ehVj Å¡pkbZ ls fxjus ds ckn 5 fdxzk- æO;eku ds m from rest would be approximately equal to: ,d fi.M dk osx yxHkx gksxk% (A) 5 m/sec (B) 10 m/sec (A) 5 ehVj/lsds.M (B) 10 ehVj/lsds.M (C) 25 m/sec (D) 50 m/sec (C) 25 ehVj/lsds.M (D) 50 ehVj/lsds.M 36. A spherical vessel with an inside diameter of 2 m is 36. ,d xksykdkj ik= ftldk vkUrfjd O;kl 2 eh- gS] dks 500 fdxzk- made of material having an allowable stress in tension @lseh2 ruko esa vuqes; çfrcy okys inkFkZ ls cuk;k tkrk gSA 25 of 500 kg/cm2. The thickness of a shell to withstand a fdxzk- @ lseh-2 nkc dks lgus ds fy, ik= dh eksVkbZ gksxh% 2 pressure of 25 kg/cm should be: (A) 5 lseh- (B) 10 lseh- (A) 5 cm (B) 10 cm (C) 2.5 lseh- (D) 1.25 lseh- (C) 2.5 cm (D) 1.25 cm 37. Consider the following statements: MIG welding 37. fuEukafdr dFkuksa ij fopkj djsa% MIG osYMu çØe esa ç;ksx fd, tkrs process uses: gSa% 1. Consumable electrode 1. miHkksT; bysDVªkWM 2. Non-consumable electrode 2. xSj&miHkksT; bysDVªkWM 3. D.C. power supply 3. D.C. 'kfä vkiwfrZ 4. A.C. power supply 4. A.C. 'kfä vkiwfrZ Which of the following option is correct? fuEukafdr fodYiksa esa ls dkSu&lk lgh gSA (A) 2 and 4 are correct (B) 2 and 3 are correct (A) 2 ,oa 4 lgh gSa (B) 2 ,oa 3 lgh gSa (C) 1 and 4 are correct (D) 1 and 3 are correct (C) 1 ,oa 4 lgh gSa (D) 1 ,oa 3 lgh gSa 38. Match the following: 38. fuEukafdr dk feyku djsa% A. Pantograph 1. Slider Crank Chain A. isUVksxzkQ 1. LykbMj ØsUd psu B. Gnome Engine 2. Double Slider Crank Chain B. ukse batu 2. nqgjh LykbMj ØsUd psu C. Scotch Yoke Mechanism 3. Quadric Chain C. LdkWp ;ksd ;kaf=dh 3. DokfMªd psu (A) A-1, B-2, C-3 (B) A-2, B-3, C-1 (A) A-1, B-2, C-3 (B) A-2, B-3, C-1 (C) A-1, B-3, C-2 (D) A-3, B-1, C-2 (C) A-1, B-3, C-2 (D) A-3, B-1, C-2 39. A closed thermodynamic system is one in which: 39. ,d cUn rkixfrdh ra= og gksrk gS ftlesa% (A) There is no energy or mass transfer across the (A) ifjlhek ds ikj dksbZ ÅtkZ vFkok æO;eku vUrj.k ugha gksrk gS boundary (B) dksbZ æO;eku vUrj.k ugha gksrk gS fdUrq ÅtkZ vUrj.k gksrk gS (B) There is no mass transfer but energy transfer exists (C) dksbZ ÅtkZ vUrj.k ugha gksrk fdUrq æO;eku vUrj.k gksrk gS (C) There is no energy transfer but there is mass transfer (D) ÅtkZ vkSj æO;eku vUrj.k] nksuksa gh gksrs gSa (D) Both energy and mass transfer exist 40. When two unequal pulleys of different materials are 40. tc nks vleku iwfy;ksa dks fdlh eqä csYV Mªkbo ra= }kjk fofHké connected by an open belt drive system, the ratio of inkFkks± ls tksM+k tkrk gS rks ruko dk vuqikr fuHkZj djrk gS% tensions depends upon: (A) vis{kkÑr cM+h iwyh ij lEidZ dks.k ij (A) Angle of contact on the bigger pulley (B) Angle of contact on the smaller pulley (B) vis{kkÑr NksVh iwyh ij lEidZ dks.k ij (C) Average of the angle of contact on two pulleys (C) nks iwfy;ksa ij lEidZ dks.k ds vkSlr ij (D) Product of angle of contact and coefficient of friction (D) lEidZ dks.k ds mRikn vkSj nks iwfy;ksa ij ?k"kZ.k ds xq.kkad ij on two pulleys. Mechanical  SECTION–B 41. When a mixture of air and water vapour is cooled at 41. tc ok;q rFkk ty ok’i feJ.k dks ty ok’i ds lar`fIr rkieku rd] constant pressure upto saturation temperature of fLFkj nokc ij “khry fd;k tkrk gS rks çkIr rkieku dks buesa ls water vapour, the temperature attained is known as: fdl :i esa tkuk tkrk gSA (A) Dry bulb temperature (A) “kq’d cYc rkieku (B) Wet bulb temperature (B) vkæZ cYc rkieku (C) Dew point temperature (C) vkslkad rkieku (D) Critical temperature (D) ØkfUrd rkieku 42. The tendency of a diesel engine to knock increases, if: 42. Mhty batu dh vk?kkr ¼ukWd½ djus dh ço`fÙk c