3
Section A I. i) Very short answer type questions. ii) Answer ALL questions. iii) Each question carries TWO marks. 10 2 = 20 1. A small angled prism of 4 deviates a ray through 2.48. Find the refractive index of the prism. 2. What is the importance of Oersted's experiment? 3. What is the magnetic moment associated with a solenoid? 4. Define magnetic declination. 5. A transformer converts 200 V ac into 2000 V ac. Calculate the number of turns in the secondary if the primary has 10 turns. 6. Give two uses of infrared waves. 7. What is the de Broglie wavelength associated with an elec- tron, accelerated through a potential difference of 100 volts? 8. State Heisenberg's uncertainity principle. 9. Draw the circuit symbols for p-n-p and n-p-n transistors. 10. What is sky wave propagation? Section B II. i) Short answer type questions. ii) Answer any SIX questions. iii) Each question carries FOUR marks. 6 4 = 24 11. Define critical angle. Explain total internal reflection using a neat diagram. 12. Explain Doppler effect in light. Distinguish between red shift and blue shift. 13. Derive the equation for the couple acting on an electric dipole in a uniform electric field. 14. Three capacitors of capacitance 2 pF, 3 pF and 4 pF are connected in parallel. a) What is the total capacitance of the combination? b) Determine the charge on each capacitor if the combina- tion is connected to a 100 V supply. 15. State and explain Biot - Savart law. 16. Obtain an expression for the mutual inductance of two long coaxial solenoids. 17. Describe Rutherford atomic model. What are the drawbacks of this model? 18. What is rectification? Explain the working of a full wave rectifier. Section - C III. i) Long answer type questions. ii) Answer any TWO questions. iii) Each question carries EIGHT marks. 2 8 = 16 19. How are stationary waves formed in open pipes? Derive the equation for the frequencies of the harmonics produced. An open organ pipe of 85 cm long is sounded. If velocity of sound is 340 m/s, what is the fundamental frequency of vibration of the air column? 20. State Kirchoff's law for an electrical network. Using these laws deduce the condition for balance in a Wheatstone bridge. A wire of resistance 4 R is bent in the form of a circle. What is the effective resistance between the ends of the diameter? 21. Explain the principle and working of a nuclear reactor with the help of a labelled diagram. If one microgram of 235 U 92 is completely destroyed in an atom bomb, how much energy released? email: [email protected] øŒ‰vÚÛî¦ô¢Ù 14 íƇvñ÷J 2020 šú¤Ûû - A I. i) ÍAú£yõp ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª. ii) ÍEo ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè…. iii) ví£A ví£øŒoÚÛª ·ôÙè[ª ÷«ô¢ª\õª 10 2 = 20 1. 4 ú£y-õp-ÚÁéÙ Þœõ í£ådÚÛÙ ÖÚÛ Ú¥ÙA Ú¨ô¢-é°Eo 2.48 êÁ NàŸ-õìÙ à¶ú£ªhÙC.- Íô³ê¶ í£ådÚÛÙ ÷vÚ©-òÅ¡-÷ì Þœªé-Ú¥Eo ÚÛìª-ÚÁ\Ùè….- 2. Î-ô³-ôÂ-šúdè ví£óμ«ÞœÙ vð§÷³-ÜuêŸ ÔNªæ¨? 3. þ¼-L-û¦-ô³-èÂö˺ Íìª-ñÙ-CÅ-êŸ-îμªiì ÍóŸª-þ§\ÙêŸ vòÅ°÷ªÚÛÙ ÓÙêŸ? 4. Í-óŸª-þ§\ÙêŸ CÚ¥p-ê¦Eo Eô¢y-#Ù-àŸÙè….- 5. í£C vð§ëÇ]-NªÚÛ BÞœ-àŸ ªåªx Þœõ ÖÚÛ í£J-÷-ô¢hÚÛÙ 200 V ac E 2000 V ac Ú¨ ÷«ô¢a-Þœ-L-Tê¶ ë¯E Þ½é BÞœ-àŸª-åxìª öËμÚ¨\Ù-àŸÙè….- 6. í£-ô¦-ô¢ªé Ú¨ô¢-é°õ ·ôÙè[ª Ñí£-óμ«-Þ¥-õìª ô¦óŸªÙè….- 7. 100 îËÁ-õªdõ ð»çËμ-E{-óŸªöËÀ ê¶è¯ ë¯yô¦ êŸyJ-êŸ-÷ªó¶ªu Óõ-vÚ¥d-ûÂêÁ ÍìªñÙCÅ-êŸîμªi ÑÙè˶ è…vò°óÀª êŸô¢Ù-Þœ-ëμj-ô¢+¬uÙ ÓÙêŸ? 8. šïj°-ú£-ûÂ-ñôÂ_ ÍE-Pa-êŸêŸy ú£«vê¦Eo ›íô•\-ìÙè….- 9. p-n-p, n-p-n væ°-Eq-ú£dô¢x ÷õóŸª ú£Ù¸Ú-ê¦-õìª UóŸªÙè….- 10. Î-Ú¥øŒ êŸô¢ÙÞœ î¦uí£ìÙ ÍÙç˶ ÔNªæ¨? šú¤Ûû - B II. i) ú£yõp ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª. ii) Ôîμjû¦ Îô¢ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè…. iii) ví£A ví£øŒoÚÛª û¦õªÞœª ÷«ô¢ª\õª 6 4 = 24 11. ú£Ù-CÞœÌÄ ÚÁé°Eo Eô¢y-#Ù#, ë¯Eo í£åÙ ú£ï£„-óŸªÙêÁ N÷-JÙ-àŸÙè….- 12. Ú¥Ù-Aö˺ è¯í£xô ví£òÅ°-î¦Eo N÷-JÙ-àŸÙè….- Íô¢ªé Nþ§–-í£ìÙ, FL Nþ§–í£û¦õ ÷ªëÅ]u òÅ˶ë¯Eo ÞœªJhÙ-àŸÙè….- 13. Ô-ÚÛ-KA Në]ªuê ¸¤vêŸÙ-ö˺E Në]ªuê èËμjð¼-öËÀšíj í£E-ඛú óŸ³Þ¥t-EÚ¨ öË¶ë¯ æ°ôÂ\ÚÛª ú£÷«-þ§Eo Ñê¦p-CÙ-àŸÙè….- 14. 2 pF, 3 pF, 4 pF õ ·Úð§-ú‡-çËμ-ûÂqõª Þœõ ÷´è[ª ·Úð§-ú‡-å-ô¢xìª ú£÷«Ù- êŸô¢ ú£ÙëůìÙ à¶ø‹ô¢ª.- a) Ð ú£Ùóμ«ÞœÙ îμ³êŸhÙ ·Úð§-ú‡-çËμûÂq ÓÙêŸ? b) Ð ú£Ùóμ«-Þ¥Eo 100 V ò°u-å-KÚ¨ ÚÛL-í‡-ì-í£±pè[ª, ví£A ·Úð§-ú‡-å-ôšíj ÑÙè˶ Îî¶øŒÙ ÓÙêŸ? 15. ñ-óŸªæÀ n- ú£÷ôÂd EóŸª-÷«Eo êμLí‡, N÷-JÙ-àŸÙè….- 16. ·ôÙè[ª ð»è[-îμjì ú£ï£„¤Û þ¼L-û¦-ô³-èÂõ ÍûÁuìu v›íô¢-ÚÛ-ê¦y-EÚ¨ ÖÚÛ ú£÷«þ§Eo ð»Ùë]Ùè….- 17. ô¢«-ëÇ]-ôÂ-íÆ£ô“ í£ô¢-÷«éª ì÷´-û¦ìª ÷JgÙ-àŸÙè….- Ð ì÷´û¦ ö˺ð§õª ÔNªæ¨? 18. Ô-ÚÛ-CÅ-ÚÛ\-ô¢éÙ ÍÙç˶ ÔNªæ¨? í£²ô¢g-êŸ-ô¢ÙÞœ ÔÚÛ-CÅ-ÚÛ\-Jé¨ í£E-ඛú Nëůû¦Eo N÷-JÙ-àŸÙè….- šú¤Ûû - C III. i) Dô¢+ ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª. ii) Ôîμjû¦ ·ôÙè[ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè…. iii) ví£A ví£øŒoÚÛª ÓENªC ÷«ô¢ª\õª 2 8 = 16 19. êμJ-#ì Þ•ådÙö˺ Î÷”-êŸ-îμªiì Þ¥L-ú£hÙ-òÅ¡Ùö˺ ú‡–ô¢ êŸô¢Ù-Þ¥õª Ôô¢p-è[-æ°Eo N÷-JÙ-àŸÙè….- ÑêŸp-êŸhó¶ªu Íìª-ú£y-ô¦õ ð¿ìl-í£±-û¦u-õÚÛª ú£Oª-ÚÛ-ô¢-é°-õìª Ñê¦p-CÙ-àŸÙè….- 85 šúÙ.-Oª.- ð»è[-÷±ìo ÖÚÛ êμJ-#ì Îô¦_û šíjíÃìª ëÅ]yEÙ-í£-â˶-ø‹ô¢ª.- ëÅ]yE-î¶ÞœÙ 340 Oª.-/-šú.- Í-ô³ê¶ Þ¥L-ú£hÙòÅ¡Ù vð§ëÇ]-NªÚÛ ð¿ìl-í£±ìuÙ ÓÙêŸ? 20. ÖÚÛ Në]ªu-êÂ- â°-ö°-EÚ¨ Ú¨ô¦\íÆà EóŸª-÷«-õìª êμõ-í£Ùè….- Ð EóŸª-÷«- õìª Ñí£-óμ«-TÙ# OæÀ-ú£dû vGè…bÚ¨ ú£Ù꟪-õì EñÙ-ëÅ]-ììª ô¦ñ-ådÙè….- 4 R E-ôÁëÅ]Ù Þœõ ÖÚÛ BÞœìª ÷”ê¦h-Ú¥-ô¢Ùö˺ ÷Ùà¦ô¢ª.- ë¯E î¦uú£Ù Ú•ìõ ÷ªëÅ]u Þœõ ví£òÅ°-î¦-êŸtÚÛ EôÁëÅ]Ù ÓÙêŸ ? 21. í£åÙ ú£ï£„-óŸªÙêÁ ¸ÚÙvë]ÚÛ JóŸ«-ÚÛdô ú£«vêŸÙ, í£E-ඛú Nëů-û¦-õìª N÷JÙ-àŸÙè….- ÖÚÛ í£ô¢-÷«éª Nþ¼pÄ-å-ìö˺ ÖÚÛ îμªivÚÁ-vÞ¥îª 235 U 92 ú£Ùí£²-ô¢gÙÞ¥ û¦øŒìîμªiê¶ ÓÙêŸ øŒÚ¨h Nè[ª-ë]-õ-÷±-꟪ÙC? SENIOR INTER MODEL PAPER - 2020 Time: 3 Hours Physics (English Medium) Max. Marks: 60 BOARD OF INTERMEDIATE EDUCATION SENIOR INTER MODEL PAPER - 2020 Physics (Telugu Medium) Time: 3 Hours Max. Marks: 60 1. What are the limitations of Bohr's theory of hydrogen atom? A: Limitations of Bohr's theory: H It is applicable only to hydrogenic (single electron) atoms. It cannot be extended to even two electron atoms such as Helium. H It is unable to explain the relative intensi- ties of the frequencies emitted even by hydrogenic atoms. H It doesn't explain the Zeeman effect, when the spectral line is split into several compo- nents in the presence of a magnetic field. H It failed to explain the Stark effect, when the spectral line gets split up into fine lines in the presence of an electric field. 2. Define Intensity of electric field at a point. Derive an expression for the intensity due to a point charge. A: Intensity of electric field (E): It is defined as the force experienced by a unit positive charge placed at that point in an electric F field. E = q Let us consider a point charge Q placed at O. Due to this charge an electric field is produced. Consider a point P at a distance r from O. Let a unit positive charge ‘q’ is placed at P. Then according to Coulomb's law, the force between Q and q is given by 1 Qq F = . 4 0 r 2 F 1 Q by definition E = = . q 4 0 r 2 3. A 100 turn closely wound circular coil of radius 10 cm carries a current of 3.2 A. a) What is the field at the centre of the coil? b) What is the magnetic moment of this coil? A: Given that r = 10 cm = 10 10 2 m = 0.1 m, N = 100, I = 3.2 A 0 NI a) Field at the centre of the coil B = 2r 4 10 7 100 3.2 = B = 2 10 3 T 2 0.1 b) Magnetic moment of the coil M = NIA = NI. r 2 M = 100 3.2 3.14 0.1 0.1 = 10 A m 2 1. A concave mirror produces an image of a long vertical pin, placed 40 cm from the mirror, at the position of the object. Find the focal length of the mirror. A: As per the problem, Object distance (u) = 40 cm Image distance (v) = 40 cm 1 1 1 from the mirror equation: = + f u v 1 1 1 2 1 = + = = f 40 40 40 20 f = 20 cm 2. What happens to compass needle at the earth's poles? A: At the poles, the horizontal component of the earth's magnetic field is zero. Hence a compass needle can point along any direction. But a dip needle will point straight down at the magnetic poles. 3. Define power factor. On which factors does power factor depend? A: Power factor: The cosine of the phase angle () between alternating voltage and alternating current is called power factor (cos ). (or) It is defined as the ratio of real power absorbed by the load to the appar- ent power flowing in the circuit. The power factor of a system depends on the type of load present, whether resistive, inductive or capacitive. 4 Marks Questions 2 Marks Questions Target-2020 Senior Inter Physics 100 100 Define power factor - K.S.S Rajasekhar FOR ANSWERS Clik on : https://tinyurl.com/vpdp5pz For more information visit www.eenadupratibha.net

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Page 1: Time: 3 Hours Physics (English Medium) Max. Marks: 60...Derive an expression for the intensity due to a point charge. A: Intensity of electric field (E): ... A 100 turn closely wound

Section AI. i) Very short answer type questions.

ii) Answer ALL questions.iii) Each question carries TWO marks. 10 2 = 20

1. A small angled prism of 4 deviates a ray through 2.48. Findthe refractive index of the prism.

2. What is the importance of Oersted's experiment?3. What is the magnetic moment associated with a solenoid?4. Define magnetic declination.5. A transformer converts 200 V ac into 2000 V ac. Calculate the

number of turns in the secondary if the primary has 10 turns.6. Give two uses of infrared waves.7. What is the de Broglie wavelength associated with an elec-

tron, accelerated through a potential difference of 100 volts?8. State Heisenberg's uncertainity principle.9. Draw the circuit symbols for p-n-p and n-p-n transistors.10. What is sky wave propagation?

Section BII. i) Short answer type questions.

ii) Answer any SIX questions.

iii) Each question carries FOUR marks. 6 4 = 2411. Define critical angle. Explain total internal reflection using a

neat diagram.12. Explain Doppler effect in light. Distinguish between red shift

and blue shift.13. Derive the equation for the couple acting on an electric

dipole in a uniform electric field.14. Three capacitors of capacitance 2 pF, 3 pF and 4 pF are

connected in parallel.a) What is the total capacitance of the combination?b) Determine the charge on each capacitor if the combina-

tion is connected to a 100 V supply.15. State and explain Biot - Savart law.16. Obtain an expression for the mutual inductance of two long

coaxial solenoids.17. Describe Rutherford atomic model. What are the drawbacks

of this model?18. What is rectification? Explain the working of a full wave

rectifier.

Section - CIII. i) Long answer type questions.

ii) Answer any TWO questions.

iii) Each question carries EIGHT marks. 2 8 = 16

19. How are stationary waves formed in open pipes? Derive theequation for the frequencies of the harmonics produced.

An open organ pipe of 85 cm long is sounded. If velocity ofsound is 340 m/s, what is the fundamental frequency ofvibration of the air column?

20. State Kirchoff's law for an electrical network. Using theselaws deduce the condition for balance in a Wheatstonebridge.

A wire of resistance 4 R is bent in the form of a circle. Whatis the effective resistance between the ends of the diameter?

21. Explain the principle and working of a nuclear reactor withthe help of a labelled diagram.

If one microgram of 235U92

is completely destroyed in an atom

bomb, how much energy released?

email: [email protected]øŒ‰vÚÛî¦ô¢Ù 14 íƇvñ÷J 2020

šú¤ÛûÂ - A

I. i) ÍAú£yõp ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª.ii) ÍEo ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£A ví£øŒoÚÛª ·ôÙè[ª ÷«ô¢ª\õª 10 2 = 20

1. 4 ú£y-õp-ÚÁéÙ Þœõ í£ådÚÛÙ ÖÚÛ Ú¥ÙA Ú¨ô¢-é°Eo 2.48 êÁ NàŸ-õìÙà¶ú£ªhÙC.- Íô³ê¶ í£ådÚÛÙ ÷vÚ©-òÅ¡-÷ì Þœªé-Ú¥Eo ÚÛìª-ÚÁ\Ùè….-

2. Î-ô³-ôÂ-šúdè ví£óμ«ÞœÙ vð§÷³-ÜuêŸ ÔNªæ¨?3. þ¼-L-û¦-ô³-èÂö˺ Íìª-ñÙ-CÅ-êŸ-îμªiì ÍóŸª-þ§\ÙêŸ vòÅ°÷ªÚÛÙ ÓÙêŸ?4. Í-óŸª-þ§\ÙêŸ CÚ¥p-ê¦Eo Eô¢y-#Ù-àŸÙè….-5. í£C vð§ëÇ]-NªÚÛ BÞœ-àŸªåªx Þœõ ÖÚÛ í£J-÷-ô¢hÚÛÙ 200 V ac E 2000 V ac Ú¨

÷«ô¢a-Þœ-L-Tê¶ ë¯E Þ½é BÞœ-àŸª-åxìª öËμÚ¨\Ù-àŸÙè….-6. í£-ô¦-ô¢ªé Ú¨ô¢-é°õ ·ôÙè[ª Ñí£-óμ«-Þ¥-õìª ô¦óŸªÙè….- 7. 100 îËÁ-õªdõ ð»çËμ-E{-óŸªöËÀ ê¶è¯ ë¯yô¦ êŸyJ-êŸ-÷ªó¶ªu Óõ-vÚ¥d-ûÂêÁ

ÍìªñÙCÅ-êŸîμªi ÑÙè˶ è…vò°óÀª êŸô¢Ù-Þœ-ëμj-ô¢+¬uÙ ÓÙêŸ?8. šïj°-ú£-ûÂ-ñôÂ_ ÍE-Pa-êŸêŸy ú£«vê¦Eo ›íô•\-ìÙè….-9. p-n-p, n-p-n væ°-Eq-ú£dô¢x ÷õóŸª ú£Ù¸Ú-ê¦-õìª UóŸªÙè….-

10. Î-Ú¥øŒ êŸô¢ÙÞœ î¦uí£ìÙ ÍÙç˶ ÔNªæ¨?

šú¤ÛûÂ - B

II. i) ú£yõp ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª.ii) Ôî�μjû¦ Îô¢ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£A ví£øŒoÚÛª û¦õªÞœª ÷«ô¢ª\õª 6 4 = 24

11. ú£Ù-CÞœÌÄ ÚÁé°Eo Eô¢y-#Ù#, ë¯Eo í£åÙ ú£ï£„-óŸªÙêÁ N÷-JÙ-àŸÙè….-12. Ú¥Ù-Aö˺ è¯í£xô ví£òÅ°-î¦Eo N÷-JÙ-àŸÙè….- Íô¢ªé Nþ§–-í£ìÙ, FL

Nþ§–í£û¦õ ÷ªëÅ]u òÅ˶ë¯Eo ÞœªJhÙ-àŸÙè….-13. Ô-ÚÛ-KA Në]ªuê ¸¤vêŸÙ-ö˺E Në]ªuê èËμjð¼-öËÀšíj í£E-ඛú óŸ³Þ¥t-EÚ¨ ö˶ë¯

æ°ôÂ\ÚÛª ú£÷«-þ§Eo Ñê¦p-CÙ-àŸÙè….-14. 2 pF, 3 pF, 4 pF õ ·Úð§-ú‡-çËμ-ûÂqõª Þœõ ÷´è[ª ·Úð§-ú‡-å-ô¢xìª ú£÷«Ù-

êŸô¢ ú£ÙëůìÙ à¶ø‹ô¢ª.- a) Ð ú£Ùóμ«ÞœÙ îμ³êŸhÙ ·Úð§-ú‡-çËμûÂq ÓÙêŸ?b) Ð ú£Ùóμ«-Þ¥Eo 100 V ò°u-å-KÚ¨ ÚÛL-í‡-ì-í£±pè[ª, ví£A ·Úð§-ú‡-å-ôšíj

ÑÙè˶ Îî�¶øŒÙ ÓÙêŸ?15. ñ-óŸªæÀ n- ú£÷ôÂd EóŸª-÷«Eo êμLí‡, N÷-JÙ-àŸÙè….-16. ·ôÙè[ª ð»è[-î�μjì ú£ï£„¤Û þ¼L-û¦-ô³-èÂõ ÍûÁuìu v›íô¢-ÚÛ-ê¦y-EÚ¨ ÖÚÛ

ú£÷«þ§Eo ð»Ùë]Ùè….-17. ô¢«-ëÇ]-ôÂ-íÆ£ô“ í£ô¢-÷«éª ì÷´-û¦ìª ÷JgÙ-àŸÙè….- Ð ì÷´û¦ ö˺ð§õª

ÔNªæ¨?

18. Ô-ÚÛ-CÅ-ÚÛ\-ô¢éÙ ÍÙç˶ ÔNªæ¨? í£²ô¢g-êŸ-ô¢ÙÞœ ÔÚÛ-CÅ-ÚÛ\-Jé¨ í£E-ඛúNëůû¦Eo N÷-JÙ-àŸÙè….-

šú¤ÛûÂ - C

III. i) Dô¢+ ú£÷«ëůì êŸô¢ï£„ ví£øŒoõª.ii) Ôî�μjû¦ ·ôÙè[ª ví£øŒoõÚÛª ú£÷«ëůû¦õª ô¦óŸªÙè….

iii) ví£A ví£øŒoÚÛª ÓENªC ÷«ô¢ª\õª 2 8 = 16

19. êμJ-#ì Þ•ådÙö˺ Î÷”-êŸ-îμªiì Þ¥L-ú£hÙ-òÅ¡Ùö˺ ú‡–ô¢ êŸô¢Ù-Þ¥õª Ôô¢p-è[-æ°EoN÷-JÙ-àŸÙè….- ÑêŸp-êŸhó¶ªu Íìª-ú£y-ô¦õ ð¿ìl-í£±-û¦u-õÚÛª ú£Oª-ÚÛ-ô¢-é°-õìªÑê¦p-CÙ-àŸÙè….-

85 šúÙ.-Oª.- ð»è[-÷±ìo ÖÚÛ êμJ-#ì Îô¦_û šíjíÃìª ëÅ]yEÙ-í£-â˶-ø‹ô¢ª.-ëÅ]yE-î�¶ÞœÙ 340 Oª.-/-šú.- Í-ô³ê¶ Þ¥L-ú£hÙòÅ¡Ù vð§ëÇ]-NªÚÛ ð¿ìl-í£±ìuÙÓÙêŸ?

20. ÖÚÛ Në]ªu-êÂ- â°-ö°-EÚ¨ Ú¨ô¦\íÆà EóŸª-÷«-õìª êμõ-í£Ùè….- Ð EóŸª-÷«-õìª Ñí£-óμ«-TÙ# OæÀ-ú£dû vGè…bÚ¨ ú£Ù꟪-õì EñÙ-ëÅ]-ììª ô¦ñ-ådÙè….-

4 R E-ôÁëÅ]Ù Þœõ ÖÚÛ BÞœìª ÷”ê¦h-Ú¥-ô¢Ùö˺ ÷Ùà¦ô¢ª.- ë¯E î¦uú£Ù Ú•ìõ÷ªëÅ]u Þœõ ví£òÅ°-î¦-êŸtÚÛ EôÁëÅ]Ù ÓÙêŸ ?

21. í£åÙ ú£ï£„-óŸªÙêÁ ¸ÚÙvë]ÚÛ JóŸ«-ÚÛdô ú£«vêŸÙ, í£E-ඛú Nëů-û¦-õìªN÷JÙ-àŸÙè….-ÖÚÛ í£ô¢-÷«éª Nþ¼pÄ-å-ìö˺ ÖÚÛ îμªivÚÁ-vÞ¥îª 235U

92ú£Ùí£²-ô¢gÙÞ¥

û¦øŒìîμªiê¶ ÓÙêŸ øŒÚ¨h Nè[ª-ë]-õ-÷±-꟪ÙC?

SENIOR INTER MODEL PAPER - 2020Time: 3 Hours Physics (English Medium) Max. Marks: 60

BOARD OF INTERMEDIATE EDUCATION

SENIOR INTER MODEL PAPER - 2020Physics (Telugu Medium)

Time: 3 Hours Max. Marks: 60

1. What are the limitations of Bohr's theory ofhydrogen atom?

A: Limitations of Bohr's theory:H It is applicable only to hydrogenic (single

electron) atoms. It cannot be extended toeven two electron atoms such as Helium.

H It is unable to explain the relative intensi-ties of the frequencies emitted even byhydrogenic atoms.

H It doesn't explain the Zeeman effect, whenthe spectral line is split into several compo-nents in the presence of a magnetic field.

H It failed to explain the Stark effect, whenthe spectral line gets split up into fine linesin the presence of an electric field.

2. Define Intensity of electric field at a point.Derive an expression for the intensity dueto a point charge.

A: Intensity of electric field (E): It is definedas the force experienced by a unit positivecharge placed at that point in an electric

Ffield. E =

q

Let us consider a point charge Q placed atO. Due to this charge an electric field isproduced. Consider a point P at a distance rfrom O. Let a unit positive charge ‘q’ is placedat P. Then according to Coulomb's law, theforce between Q and q is given by

1 QqF = .

40 r2

F 1 Qby definition E = = .

q 40 r2

3. A 100 turn closely wound circular coil ofradius 10 cm carries a current of 3.2 A.

a) What is the field at the centre of the coil?

b) What is the magnetic moment of this coil?A: Given that r = 10 cm = 10 102 m

= 0.1 m, N = 100, I = 3.2 A0NI

a) Field at the centre of the coil B = 2r

4 107 100 3.2= B = 2 103 T

2 0.1b) Magnetic moment of the coil M = NIA

= NI. r2

M = 100 3.2 3.14 0.1 0.1 = 10 A m2

1. A concave mirror produces an image of along vertical pin, placed 40 cm from themirror, at the position of the object. Findthe focal length of the mirror.

A: As per the problem, Object distance (u) = 40 cm

Image distance (v) = 40 cm1 1 1

from the mirror equation: = + f u v

1 1 1 2 1 = + = = f 40 40 40 20

f = 20 cm2. What happens to compass needle at the

earth's poles?A: At the poles, the horizontal component of

the earth's magnetic field is zero. Hence acompass needle can point along anydirection. But a dip needle will pointstraight down at the magnetic poles.

3. Define power factor. On which factorsdoes power factor depend?

A: Power factor: The cosine of the phaseangle () between alternating voltage andalternating current is called power factor(cos ). (or) It is defined as the ratio of realpower absorbed by the load to the appar-ent power flowing in the circuit. The powerfactor of a system depends on the type ofload present, whether resistive, inductiveor capacitive.

4 Marks Questions

2 Marks Questions

Target-2020Senior Inter

Physics100100

Define power factor

- K.S.S Rajasekhar

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