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62 /OSS/2-312-A ]^1 [ Contd...
This Question Paper consists of 30 questions including 2 figures and 8 printed pages.
ß‚ ¬˝‡Ÿ-¬òÊ ◊¥ 30 ¬˝‡Ÿ ∑§ 8 ◊ÈÁŒ˝Ã ¬Îc∆U U •ÊÒ⁄U 2 •Ê∑ΧÁÃÿÊ° „Ò–
Roll No.
•ŸÈ∑˝§◊Ê¥∑§
Code No.
∑§Ê«U Ÿ¥.^62 /OSS/^2
PHYSICS
(÷ÊÒÁÃ∑§ ÁflôÊÊŸ)
Day and Date of Examination
¬⁄UˡÊÊ ∑§Ê ÁŒŸ fl ÁŒŸÊ¥∑§
Signature of Invigilators 1. ÁŸ⁄UˡÊ∑§Ê¥ ∑§ „SÃÊˇÊ⁄U
General Instructions :
- Candidate must write his/her Roll Number on the first page of the Question Paper.
- Please check the Question Paper to verify that the total pages and total number of questions contained in the Question Paper are the same as those printed on the top of the first page. Also check to see that the questions are in sequential order.
- Making any identification mark in the Answer-Book or writing Roll Number anywhere other than the specified places will lead to disqualification of the candidate.
- Write your Question Paper Code No. 62 /OSS/ 2 - A on the Answer-Book.
- (a) The Question Paper is in English/Hindi medium only. However, if you wish, you can answer in any one of the languages listed below : English, Hindi, Urdu, Punjabi, Bengali, Tamil, Malayalam, Kannada, Telugu, Marathi, Oriya, Gujarati, Konkani, Manipuri, Assamese, Nepali, Kashmiri, Sanskrit and Sindhi. You are required to indicate the language you have chosen to answer in the box provided in the Answer-Book. (b) If you choose to write the answer in the language other than Hindi and English, the responsibility for any errors/mistakes in understanding the question will be yours only.
‚Ê◊Êãÿ •ŸÈŒ‡Ê —
- ¬⁄UˡÊÊÕ˸ ¬˝‡Ÿ¬òÊ ∑§ § ¬„‹ ¬Îc∆U ¬⁄U •¬ŸÊ •ŸÈ∑˝§◊Ê¥∑§ •fl‡ÿU Á‹π¥–
- ∑Χ¬ÿÊ ¬˝‡Ÿ¬òÊ ∑§Ê ¡ÊÚ°ø ‹¥ Á∑§ ¬˝‡Ÿ¬òÊ ∑§ ∑ȧ‹ ¬Îc∆UÊ¥ ÃÕÊ ¬˝‡ŸÊ¥ ∑§Ë ©ÃŸË „Ë ‚¥ÅUÿÊ „Ò Á¡ÃŸË ¬˝Õ◊ ¬Îc∆ ∑ §‚’‚ ™§¬⁄U ¿U¬Ë „Ò– ß‚ ’ÊÃ
∑§Ë ¡ÊÚ°ø ÷Ë ∑§⁄U ‹¥ Á∑§ ¬˝‡Ÿ ∑˝ Á◊∑§ UM§¬ ◊¥ „Ò¥–
- § ©ûÊ⁄U-¬ÈÁSUÃ∑§Ê ◊¥ ¬„øÊŸ-Áøq ’ŸÊŸ •ÕflÊ ÁŸÁŒ¸c≈U SÕÊŸÊ¥ ∑§§ •ÁÃÁ⁄UÄà ∑§„Ë¥ ÷Ë •ŸÈ∑˝§◊Ê¥∑§ Á‹πŸ ¬⁄U ¬⁄UˡÊÊÕ˸ ∑§Ê •ÿÊÇÿ ∆U„⁄UÊÿÊ
¡ÊÿªÊ–
- •¬ŸË ©ûÊ⁄U-¬ÈÁSUÃ∑§Ê ¬⁄U ¬˝‡Ÿ¬òÊ ∑§Ë ∑§Ê«U ‚¥ÅÿÊ 62 /OSS/ 2 - A Á‹π¥–
- (∑§) ¬˝‡Ÿ¬òÊ ∑§fl‹ Á„¥ŒË/•¥ª˝¡Ë ◊¥ „Ò– Á»§⁄U ÷Ë, ÿÁŒ •Ê¬ øÊ„¥ ÃÊ ŸËø ŒË ªß¸ Á∑§‚Ë ∞∑§ ÷Ê·Ê ◊¥ ©ûÊ⁄ Œ ‚∑§Ã „Ò¥ —
•¥ª˝¡Ë, Á„¥ŒË, ©ŒÍ¸, ¬¥¡Ê’Ë, ’°ª‹Ê, ÃÁ◊‹, ◊‹ÿÊ‹◊, ∑§ãŸ«∏, ËȪÈ, ◊⁄UÊ∆UË, ©Á«∏ÿÊ, ªÈ¡⁄UÊÃË, ∑§Ê¥∑§áÊË, ◊ÁáʬÈ⁄UË, •‚Á◊ÿÊ, Ÿ¬Ê‹Ë, ∑§‡◊Ë⁄UË, ‚¥S∑Χç•ÊÒ⁄U Á‚¥œË– ∑Χ¬ÿÊ ©ûÊ⁄U-¬ÈÁSÃ∑§Ê ◊¥ ÁŒ∞ ª∞ ’ÊÚÄ‚ ◊¥ Á‹π¥ Á∑§ •Ê¬ Á∑§‚ ÷Ê·Ê ◊¥ ©ûÊ⁄U Á‹π ⁄U„ „Ò¥– § (π) ÿÁŒ •Ê¬ Á„¥ŒË ∞fl¥ •¥ª˝¡Ë ∑§ •ÁÃÁ⁄UÄà Á∑§‚Ë •ãÿ ÷Ê·Ê ◊¥ ©ûÊ⁄U Á‹πà „Ò¥ ÃÊ ¬˝‡Ÿ ∑§Ê ‚◊¤ÊŸ ◊¥ „ÊŸ flÊ‹Ë òÊÈÁ≈UÿÊ¥/ª‹ÁÃÿÊ¥ ∑§Ë Á¡ê◊UŒÊ⁄Ë ∑ fl‹ •Ê¬∑§Ë „ʪ˖
Set/ ‚≈U A
62 /OSS/2-312-A ]^2 [ Contd...
PHYSICS
(÷ÊÒÁÃ∑§ ÁflôÊÊŸ)
(312)
Time : 3 Hours ] [ Maximum Marks : 80
‚◊ÿ — 3 ÉÊá≈U ] [ ¬ÍáÊÊZ∑§ — 80
Note : (i) All questions are compulsory. There is no overall choice, however, alternative choices are given in some questions. In such questions, you have to attempt only one choice. (ii) Marks allotted are indicated against each question. (iii) Each question from Question Nos. 1 to 10 has four alternative - (A), (B), (C) and (D), out of which one is most appropriate. Choose the correct answer among the four alternatives and write it in your answer-book against the number of the question. No extra time is allotted for attempting multiple choice questions.
ÁŸŒ¸‡Ê — (i) ‚÷Ë ¬˝‡ŸÊ¥ ∑§ ©ûÊ⁄U Œ¥– ¬Íáʸ ¬˝‡Ÿ-¬òÊ ◊¥ Áfl∑§À¬ Ÿ„Ë¥ „Ò¥, Á»§⁄U ÷Ë ∑ȧ¿U ¬˝‡ŸÊ¥ ◊¥ •Ê¥ÃÁ⁄U∑§ Áfl∑§À¬ „Ò– ∞‚ ‚÷Ë
¬˝‡ŸÊ¥ ◊¥ •Ê¬∑§Ê ∞∑§ „Ë Áfl∑§À¬ ∑§Ê ©ûÊ⁄U ŒŸÊ „Ò– –
(ii) ¬˝àÿ∑§ ¬˝‡Ÿ ∑§ ‚Ê◊Ÿ •¥∑§ Œ‡Êʸÿ ªÿ „Ò¥–
(iii) ¬˝‡Ÿ ‚¥ÅÿÊ 1 ‚ 10 Ã∑§ ∑§ ¬˝àÿ∑§ ¬˝‡Ÿ ◊¥ øÊ⁄U Áfl∑§À¬ - (A), (B), (C) •ÊÒ⁄U (D) ÁŒÿ ªÿ „Ò¥, Á¡Ÿ◊¥ ‚ ∞∑§ ‚’ ‚ ©¬ÿÈÄà „Ò– øÊ⁄UÊ¥ Áfl∑§À¬Ê¥ ◊¥ ‚ ‚„Ë ©ûÊ⁄U øÈŸ¥ ÃÕÊ •¬ŸË ©ûÊ⁄U-¬ÈÁSÃ∑§Ê ◊¥ ¬˝‡Ÿ ‚¥ÅÿÊ ∑§ ‚Ê◊Ÿ ©ûÊ⁄U Á‹Áπÿ– ’„ÈflÒ∑§ÁÀ¬∑§ ¬˝‡ŸÊ¥ ∑§ Á‹ÿ •ÁÃÁ⁄UÄà ‚◊ÿ Ÿ„Ë¥ ÁŒÿÊ ¡ÊÿªÊ–
- A ball of mass ‘m’ strikes a rigid wall with speed ‘u’ and rebounds back with the same speed. The impulse imparted to the ball by the wall is : (A) 2 mu (B) mu (C) zero (D) −2 mu ‘m’ Œ˝√ÿ◊ÊŸ ∑§Ë ∞∑§ ª¥Œ ŒÎ…∏ ŒËflÊ⁄U ‚ ‘u’ ªÁà ‚ ≈U∑§⁄UÊÃË „Ò •ÊÒ⁄U ≈U∑§⁄UÊŸ ∑§ ’ÊŒ ©‚Ë ªÁà ‚ flÊÁ¬‚ •ÊÃË „Ò– ŒËflÊ⁄U ∑§ mÊ⁄UÊ ª¥Œ ∑§Ê ÁŒÿÊ ªÿÊ •Êflª „Ò —
(A) 2 mu (B) mu (C) ‡ÊÍãÿ (D) −2 mu
- A crane lifts a mass of 100 kg to a height of 10 m in 20 seconds. The power of the crane is (take g=10 ms−^2 ) : (A) 100 W (B) 200 W (C) 250 W (D) 500 W ∞∑§ ∑˝§Ÿ 100 kg Œ˝√ÿ◊ÊŸ flÊ‹Ë flSÃÈ ∑§Ê 10 m ∑§Ë ™°§øÊ߸ ¬⁄U 20 ‚∑¥§«U ◊¥ ™§¬⁄U ‹ ¡ÊÃË „Ò– ∑˝§Ÿ ∑§Ë ‡ÊÁÄà „Ò (‹ËÁ¡∞ g=10 ms−^2 ) : (A) 100 W (B) 200 W (C) 250 W (D) 500 W
62 /OSS/2-312-A ]^4 [ Contd...
- An optically active substance : 1
(A) rotates the plane of polarised light
(B) changes the direction of polarised light
(C) does not allow plane polarised light to pass through it
(D) none of these
∞∑§ ¬˝∑§ÊÁ‡Ê∑§Ëÿ ¬ŒÊÕ¸ —
(A) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§ Ë ∑§Ê ÉÊÈ◊ÊÃÊ „Ò
(B) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ë ÁŒ‡ÊÊ ∑§Ê ’Œ‹ÃÊ „Ò
(C) ‚◊Ë œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ê ß‚◊¥ ‚ ªÈ¡⁄UŸ Ÿ„Ë¥ ŒÃÊ
(D) ߟ◊¥ ‚ ∑§Ê߸ Ÿ„Ë¥
- In nuclear reactions, there is a conservation of : 1
(A) Mass only (B) Energy only
(C) Momentum only (D) Mass, Energy and Momentum
ŸÊÁ÷∑§Ëÿ •Á÷Á∑˝§ÿÊ ◊¥ ‚¥⁄UˇÊáÊ „ÊÃÊ „Ò —
(A) ∑§fl‹ Œ˝√ÿ◊ÊŸ ∑§Ê (B) ∑§fl‹ ™§¡Ê¸ ∑§Ê
(C) ∑§fl‹ ‚¥flª ∑§Ê (D) Œ˝√ÿ◊ÊŸ, ™§¡Ê¸ •ÊÒ⁄U ‚¥flª ∑§Ê
- Which of the following spectral series falls within visible region of electromagnetic radiation?
(A) Lyman series (B) Balmer series (C) Paschen series (D) Pfund series
ŸËø ÁŒ∞ „È∞ ◊¥ ‚ ∑§ÊÒŸ ‚Ë S¬Ä≈˛U‹ üÊáÊË ÁfllÈÃ-øÈê’∑§Ëÿ ÁflÁ∑§⁄UáÊÊ¥ ∑§ ŒÎ‡ÿ ÷ʪ ∑§ •ãê¸Ã •ÊÃË „Ò?
(A) ‹Êß◊Ÿ üÊáÊË (B) ’Ê◊⁄U üÊáÊË (C) ¬Ê‡øŸ üÊáÊË (D) »¥§«U üÊáÊË
- The refractive index of glass is 1.5 for light waves of λ=6000 Å in vacuum. Its wavelength in glass is :
(A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å
ÁŸflʸà ◊¥ λ=6000 Å ¬˝∑§Ê‡Ê ∑§Ë Á∑§⁄UáÊÊ¥ ∑§ Á‹∞ ∑§Ê°ø ∑§Ê •¬fløŸÊ¥∑§ 1.5 „Ò– ∑§Ê°ø ◊¥ ß‚∑§Ë Ã⁄¥UªŒÒäÿ¸ ∑§Ê ◊ÊŸ „Ò —
(A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å
62 /OSS/2-312-A ]^5 [ Contd...
- Define (a) coefficient of static friction; and (b) coefficient of kinetic friction. 2
(a) SÕÒÁÃ∑§ ÉÊ·¸áÊ ªÈáÊÊ¥∑§ •ÊÒ⁄U (b) ªÁá ÉÊ·¸áÊ ªÈáÊÊ¥∑§ ∑§Ë ¬Á⁄U÷Ê·Ê ŒËÁ¡∞–
- A block of mass ‘m’ is held on a rough inclined surface of inclination θ. Show in a diagram various forces acting on the block.
‘m’ Œ˝√ÿ◊ÊŸ ∑§Ê ∞∑§ ªÈ≈U∑§Ê θ •ÊŸÁà ∑§ πÈ⁄UŒ⁄U Ë ¬⁄U ⁄UπÊ „È•Ê „Ò– ªÈ≈U∑§ ¬⁄U ¬˝÷ÊflË ÁflÁ÷㟠’‹Ê¥ ∑§Ê ÁøòÊ mÊ⁄UÊ Œ‡Êʸßÿ–
- Draw a schematic diagram of hydraulic jack for raising automobiles to the desired height.
◊Ê≈U⁄U ªÊÁ«∏ÿÊ¥ ∑§Ê ∞∑§ ÁŸÁ‡øà ™°§øÊ߸ Ã∑§ ©∆UÊŸ ∑§ Á‹∞ „Êß«˛UÊÁ‹∑§ ¡Ò∑§ ∑§Ê ∞∑§ ‚◊ÈÁøà ÁøòÊ ’ŸÊßÿ–
- State Zeroth law of Thermodynamics. How many joules of work is equivalent to one calorie of heat?
™§c◊ʪÁÃ∑§Ë ∑§ ‡ÊÍãÿ ∑§ÊÁ≈U ÁŸÿ◊ ∑§Ê ∑§ÕŸ Á‹Áπ∞– ™§c◊Ê ∑§Ë ∞∑§ ∑Ò§‹Ê⁄UË ∑§Êÿ¸ ∑§ Á∑§ÃŸ ¡Í‹ ∑§ ’⁄UÊ’⁄U „ÊÃË „Ò?
- Draw an indicator diagram for a thermodynamic system, when it expands isothermally from volume V 1 to V 2 at pressures P 1 and P 2 respectively.
™§c◊ʪÁÃ∑§Ë ÁŸ∑§Êÿ ∑§ Á‹∞ ∞∑§ ‚Íø∑§ •Ê⁄Uπ ’ŸÊßÿ, ¡’Á∑§ ŒÊ’ P 1 •ÊÒ⁄U P 2 ¬⁄U ∑˝§◊‡Ê— •Êÿß V 1 fl V 2 ‚◊ÃÊ¬Ë •flSÕÊ ◊¥ ¬˝‚Ê⁄U ∑§ ŒÊÒ⁄UÊŸ „ÊÃÊ „Ò–
- State two reasons, which were pointed out by Laplace for his correction to the formula for velocity of sound in air given by Newton.
©Ÿ ŒÊ ∑§Ê⁄UáÊÊ¥ ∑§Ê Á‹Áπ∞, Á¡ã„¥ äÿÊŸ ◊¥ ⁄Uπ∑§⁄U ‹Êå‹Ê‚ ∑§Ê flÊÿÈ ◊¥ äflÁŸ ∑§ flª ∑§ Á‹∞ ãÿÍ≈UŸ ∑§Ê ‚ÍòÊ ‚¥‡ÊÊÁœÃ ∑§⁄UŸÊ ¬«∏Ê–
- Show that for every 1 8 C rise in temperature, the velocity of sound in air increases by 0.61 ms−^1.
ÿ„ Œ‡Êʸßÿ Á∑§ ¬˝Áà 18 C Ãʬ ’…∏Ÿ ¬⁄U flÊÿÈ ◊¥ äflÁŸ ∑§Ê flª 0.61 ms−^1 ’…∏ ¡ÊÃÊ „Ò–
- Draw a graph showing the variation of resistivity of a semiconductor with temperature.
Ãʬ ∑§ ‚ÊÕ •h¸øÊ‹∑§ ∑§Ë ¬˝ÁÃ⁄UÊœ∑§ÃÊ ∑§ ¬Á⁄UfløŸ ∑§Ê Œ‡ÊʸŸ ∑§ Á‹∞ ∞∑§ ª˝Ê»§ ’ŸÊßÿ–
- What are main four observations from the experimental study of photo-electric effect?
¬˝∑§Ê‡Ê-ÁfllÈà ¬˝÷Êfl ∑§ ¬˝ÊÿÊÁª∑§ •äÿÿŸ ‚ ∑§ÊÒŸ ‚ øÊ⁄U ◊ÈÅÿ ¬˝ˇÊáÊ ¬˝Êåà „Êà „Ò¥?
62 /OSS/2-312-A ]^7 [ Contd...
- Two resistances R 1 and R 2 are connected with a battery of V volts. Compute the net resistance, when they are connected first (a) in series and then (b) in parallel. Draw circuit diagrams for each. ŒÊ ¬˝ÁÃ⁄UÊœ∑§Ê¥ R 1 •ÊÒ⁄U R 2 ∑§Ê V flÊÀ≈U ∑§Ë ’Ò≈˛UË ‚ ¡Ê«∏Ê ªÿÊ „Ò– ÃÈÀÿ ¬˝ÁÃ⁄UÊœ∑§ ∑§Ê ◊ÊŸ ôÊÊà ∑§ËÁ¡∞, ¡’Á∑§ ߟ ŒÊ ¬˝ÁÃ⁄UÊœ∑§Ê¥ ∑§Ê ∑˝§◊‡Ê— (a) ¬„‹ üÊáÊË ‚¥ÿÊ¡Ÿ ◊¥ •ÊÒ⁄U (b) Á»§⁄U ¬Ê‡fl¸ üÊáÊË ◊¥ ¡Ê«∏Ê ªÿÊ „Ò– ߟ◊¥ ‚ ¬˝àÿ∑§ ∑§Ê ¬Á⁄U¬Õ ’ŸÊßÿ–
- Derive an expression for the drift velocity of conduction electrons, when electric field is applied. ÁfllÈà ˇÊòÊ ∑§ ‹ªÊ∞ ¡ÊŸ ¬⁄U øÊ‹Ÿ ß‹Ä≈˛UÊŸÊ¥ ∑§ •¬flÊ„ flª ∑§ Á‹∞ √ÿ¥¡∑§ ¬˝Êåà ∑§ËÁ¡∞–
- State de Broglie Hypothesis. Derive an expression for the de Broglie wavelength of an elementary particle of mass ‘m’ and charge ‘q’ and moving with a velocity ‘v’ after being accelerated through a potential difference ‘V’. Á«U ’˝ÊÇ‹Ë ∑§Ë ¬Á⁄U∑§À¬ŸÊ ∑§Ê Á‹Áπ∞– ∞∑§ ◊Í‹ ∑§áÊ Á¡‚∑§Ê Œ˝√ÿ◊ÊŸ ‘m’, •Êfl‡Ê ‘q’, ‘v’ ªÁà ‚ ø‹Êÿ◊ÊŸ „Ò, ¡’ ©‚ ‘V’ Áfl÷flÊãÃ⁄U ‚ àflÁ⁄Uà Á∑§ÿÊ ¡ÊÃÊ „Ò Á«U ’˝ÊÇ‹Ë Ã⁄¥UªŒÒäÿ¸ ∑§ Á‹∞ √ÿ¥¡∑§ ¬˝Êåà ∑§ËÁ¡∞–
- (a) Show three basic components of a Transistor with the help of a diagram. 4
(b) Draw symbols of n-p-n and p-n-p transistors. (c) Why does the arrow head point ‘outward’ in case of n-p-n transistor; while ‘inward’ in case of p-n-p transistor? (a) ÁøòÊ ∑§Ë ‚„ÊÿÃÊ ‚ ≈˛UÊ¥Á¡S≈U⁄U ∑§ ÃËŸ ◊ÈÅÿ •flÿflÊ¥ ∑§Ê ÁŒπ‹Êßÿ–
(b) n-p-n •ÊÒ⁄U p-n-p ≈˛UÊ¥Á¡S≈U⁄UÊ¥ ∑§ Á‹∞ ‚Ê¥∑§ÁÃ∑§ ÁŸM§¬áÊ ∑§Ê ’ŸÊßÿ– (c) n-p-n ≈˛UÊ¥Á¡S≈U⁄U ◊¥ ’ÊáÊʪ˝ “’Ê„⁄U ∑§Ë •Ê⁄U” ¡’Á∑§ p-n-p ≈˛UÊ¥Á¡S≈U⁄U ◊¥ “•ãŒ⁄U ∑§Ë •Ê⁄U” ÄÿÊ¥ „ÊÃÊ „Ò?
- What are electric field lines? State their three properties. Draw electric field lines for (a) single positive point charge; and (b) electric dipole. ÁfllÈà ˇÊòÊ ⁄UπÊ∞° ÄÿÊ „ÊÃË „Ò¥? ©Ÿ∑§ ÃËŸ ªÈáÊœ◊ÊZ ∑§Ê Á‹Áπ∞– (a) œŸÊà◊∑§ ∞∑§‹ Á’ãŒÈ •Êfl‡Ê, •ÊÒ⁄U (b) ÁfllÈà Ámœ˝Èfl ∑§ Á‹∞ ÁfllÈà ˇÊòÊ ⁄UπÊ∞° πË¥Áø∞–
- (a) Explain the phenomenon of polarisation of light. Draw a schematic arrangement of apparatus used for it. (b) How unpolarised light is plane polarised by reflection from a transparent material? Show it by drawing a ray diagram. (c) Derive an expression for Brewster’s law. (a) ¬˝∑§Ê‡Ê ∑§ œ˝ÈflË∑§⁄UáÊ ∑§Ë ¬Á⁄UÉÊ≈UŸÊ ∑§Ê ‚◊¤ÊÊßÿ– ß‚∑§ Á‹∞ ©¬∑§⁄UáÊ ∑§Ê √ÿflSÕÊà◊∑§ ÁøòÊ ’ŸÊßÿ–
(b) Á∑§‚Ë ¬Ê⁄UŒ‡Ê˸ ¬ŒÊÕ¸ ‚ ¬⁄UÊflÁøà „Ê ¡ÊŸ ¬⁄U •œ˝ÈÁflà ¬˝∑§Ê‡Ê Á∑§‚ ¬˝∑§Ê⁄U ‚◊Ë œÈ˝Áflà „ÊÃÊ „Ò? ß‚∑§ Á‹∞ ∞∑§ Á∑§⁄UáÊ •Ê⁄Uπ ÷Ë ’ŸÊßÿ– (c) ’˝ÍS≈U⁄U ÁŸÿ◊ ∑§ Á‹∞ √ÿ¥¡∑§ ¬˝Êåà ∑§ËÁ¡∞–
62 /OSS/2-312-A ]^8 [ Contd...
- Sir C.V. Raman was awarded Nobel prize in Physics in 1930 for the discovery of ‘Raman 6 Effect’. (a) State ‘Raman Effect’, with its simple theoretical explanation. (b) Calculate refractive index of an equilateral prism, if the angle of minimum deviation is equal to the angle of prism.
‚⁄U ‚Ë.flË. ⁄U◊Ÿ ∑§Ê 1930 ◊¥ ÷ÊÒÁÃ∑§Ë ∑§Ê ŸÊ’‹ ¬È⁄US∑§Ê⁄U “⁄U◊Ÿ ¬˝÷Êfl” ∑§Ë πÊ¡ ∑§ Á‹∞ ¬˝ŒÊŸ Á∑§ÿÊ ªÿÊ ÕÊ–
(a) “⁄U◊Ÿ ¬˝÷Êfl” ∑§ ’Ê⁄U ◊¥ ’ËÊßÿ •ÊÒ⁄U ‚ÊÕ ◊¥ ß‚∑§Ë ‚⁄U‹ ‚ÒhÊÁãÃ∑§ √ÿÊÅÿÊ ∑§ËÁ¡∞–
(b) Á∑§‚Ë ‚◊’Ê„È Á¬˝í◊ ∑§ ¬ŒÊÕ¸ ∑§ •¬fløŸÊ¥∑§ ∑§Ê ¬Á⁄U∑§‹Ÿ ∑§ËÁ¡∞, ¡’ ãÿÍŸÃ◊ Áflø‹Ÿ ∑§ÊáÊ •ÊÒ⁄U Á¬˝í◊ ∑§ÊáÊ ∞∑§ ŒÍ‚⁄U ∑§ ’⁄UÊ’⁄U „Ê–
- (a) Classify solids as conductors, semiconductors and insulators, on the basis of energy bands. Draw one diagram each for their energy bands. (b) Write down main two differences between intrinsic and extrinsic semiconductors.
(a) ™§¡Ê¸ ’Ò¥«UÊ¥ ∑§ •ÊœÊ⁄U ¬⁄U øÊ‹∑§Ê¥, •h¸-øÊ‹∑§Ê¥ ∞fl¥ ÁfllÈÃ-Áfl⁄UÊÁœÿÊ¥ ∑§ flªË¸∑§⁄UáÊ ∑§ ’Ê⁄U ◊¥ Á‹Áπ∞– ¬˝àÿ∑§ ∑§ Á‹∞ ∞∑§-∞∑§ ™§¡Ê¸ ’Ò¥«U ∑§Ê ÁøòÊ ’ŸÊßÿ–
(b) ŸÒ¡ •h¸øÊ‹∑§Ê¥ fl ’Ês •h¸øÊ‹∑§Ê¥ ∑§ ’Ëø ŒÊ ◊ÈÅÿ •ãÃ⁄U Á‹Áπ∞–
OR / •ÕflÊ
(a) Explain the formation of p-n junction. Draw a diagram for it. Hence define ‘Depletion Region’ and ‘Barrier Potential’. (b) Draw I-V characteristics for a zener diode. What is its main application?
(a) p-n ‚¥Áœ ∑§Ë ‚¥⁄UøŸÊ ∑§Ê ‚◊¤ÊÊßÿ– ß‚∑§ Á‹∞ ∞∑§ ÁøòÊ ’ŸÊßÿ– “•flÿfl ˇÊòÊ” •ÊÒ⁄U “Áfl÷fl ¬˝ÊøË⁄U” ∑§Ë ¬Á⁄U÷Ê·Ê ŒËÁ¡∞–
(b) $¡Ÿ⁄U «UÊÿÊ«U ∑§ I-V •Á÷‹ˇÊáÊÊ¥ ∑§ Á‹∞ ∞∑§ fl∑˝§ÁøòÊ ’ŸÊßÿ– ß‚∑§Ê ∞∑§ ◊ÈÅÿ •ŸÈ¬˝ÿʪ ÄÿÊ „Ò?
62 /OSS/2-312-B ]^2 [ Contd...
PHYSICS
(÷ÊÒÁÃ∑§ ÁflôÊÊŸ)
(312)
Time : 3 Hours ] [ Maximum Marks : 80
‚◊ÿ — 3 ÉÊá≈U ] [ ¬ÍáÊÊZ∑§ — 80
Note : (i) All questions are compulsory. There is no overall choice, however, alternative choices are given in some questions. In such questions, you have to attempt only one choice. (ii) Marks allotted are indicated against each question. (iii) Each question from Question Nos. 1 to 10 has four alternative - (A), (B), (C) and (D), out of which one is most appropriate. Choose the correct answer among the four alternatives and write it in your answer-book against the number of the question. No extra time is allotted for attempting multiple choice questions.
ÁŸŒ¸‡Ê — (i) ‚÷Ë ¬˝‡ŸÊ¥ ∑§ ©ûÊ⁄U Œ¥– ¬Íáʸ ¬˝‡Ÿ-¬òÊ ◊¥ Áfl∑§À¬ Ÿ„Ë¥ „Ò¥, Á»§⁄U ÷Ë ∑ȧ¿U ¬˝‡ŸÊ¥ ◊¥ •Ê¥ÃÁ⁄U∑§ Áfl∑§À¬ „Ò– ∞‚ ‚÷Ë
¬˝‡ŸÊ¥ ◊¥ •Ê¬∑§Ê ∞∑§ „Ë Áfl∑§À¬ ∑§Ê ©ûÊ⁄U ŒŸÊ „Ò– –
(ii) ¬˝àÿ∑§ ¬˝‡Ÿ ∑§ ‚Ê◊Ÿ •¥∑§ Œ‡Êʸÿ ªÿ „Ò¥–
(iii) ¬˝‡Ÿ ‚¥ÅÿÊ 1 ‚ 10 Ã∑§ ∑§ ¬˝àÿ∑§ ¬˝‡Ÿ ◊¥ øÊ⁄U Áfl∑§À¬ - (A), (B), (C) •ÊÒ⁄U (D) ÁŒÿ ªÿ „Ò¥, Á¡Ÿ◊¥ ‚ ∞∑§ ‚’ ‚ ©¬ÿÈÄà „Ò– øÊ⁄UÊ¥ Áfl∑§À¬Ê¥ ◊¥ ‚ ‚„Ë ©ûÊ⁄U øÈŸ¥ ÃÕÊ •¬ŸË ©ûÊ⁄U-¬ÈÁSÃ∑§Ê ◊¥ ¬˝‡Ÿ ‚¥ÅÿÊ ∑§ ‚Ê◊Ÿ ©ûÊ⁄U Á‹Áπÿ– ’„ÈflÒ∑§ÁÀ¬∑§ ¬˝‡ŸÊ¥ ∑§ Á‹ÿ •ÁÃÁ⁄UÄà ‚◊ÿ Ÿ„Ë¥ ÁŒÿÊ ¡ÊÿªÊ–
- An optically active substance : 1
(A) rotates the plane of polarised light
(B) changes the direction of polarised light
(C) does not allow plane polarised light to pass through it
(D) none of these
∞∑§ ¬˝∑§ÊÁ‡Ê∑§Ëÿ ¬ŒÊÕ¸ —
(A) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§ Ë ∑§Ê ÉÊÈ◊ÊÃÊ „Ò
(B) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ë ÁŒ‡ÊÊ ∑§Ê ’Œ‹ÃÊ „Ò
(C) ‚◊Ë œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ê ß‚◊¥ ‚ ªÈ¡⁄UŸ Ÿ„Ë¥ ŒÃÊ
(D) ߟ◊¥ ‚ ∑§Ê߸ Ÿ„Ë¥
62 /OSS/2-312-B ]^3 [ Contd...
- In nuclear reactions, there is a conservation of : 1
(A) Mass only (B) Energy only (C) Momentum only (D) Mass, Energy and Momentum
ŸÊÁ÷∑§Ëÿ •Á÷Á∑˝§ÿÊ ◊¥ ‚¥⁄UˇÊáÊ „ÊÃÊ „Ò —
(A) ∑§fl‹ Œ˝√ÿ◊ÊŸ ∑§Ê (B) ∑§fl‹ ™§¡Ê¸ ∑§Ê
(C) ∑§fl‹ ‚¥flª ∑§Ê (D) Œ˝√ÿ◊ÊŸ, ™§¡Ê¸ •ÊÒ⁄U ‚¥flª ∑§Ê
- Which of the following spectral series falls within visible region of electromagnetic radiation? (A) Lyman series (B) Balmer series (C) Paschen series (D) Pfund series
ŸËø ÁŒ∞ „È∞ ◊¥ ‚ ∑§ÊÒŸ ‚Ë S¬Ä≈˛U‹ üÊáÊË ÁfllÈÃ-øÈê’∑§Ëÿ ÁflÁ∑§⁄UáÊÊ¥ ∑§ ŒÎ‡ÿ ÷ʪ ∑§ •ãê¸Ã •ÊÃË „Ò?
(A) ‹Êß◊Ÿ üÊáÊË (B) ’Ê◊⁄U üÊáÊË (C) ¬Ê‡øŸ üÊáÊË (D) »¥§«U üÊáÊË
- The refractive index of glass is 1.5 for light waves of λ=6000 Å in vacuum. Its wavelength in glass is : (A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å
ÁŸflʸà ◊¥ λ=6000 Å ¬˝∑§Ê‡Ê ∑§Ë Á∑§⁄UáÊÊ¥ ∑§ Á‹∞ ∑§Ê°ø ∑§Ê •¬fløŸÊ¥∑§ 1.5 „Ò– ∑§Ê°ø ◊¥ ß‚∑§Ë Ã⁄¥UªŒÒäÿ¸ ∑§Ê ◊ÊŸ „Ò —
(A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å
- A ball of mass ‘m’ strikes a rigid wall with speed ‘u’ and rebounds back with the same speed. The impulse imparted to the ball by the wall is : (A) 2 mu (B) mu (C) zero (D) −2 mu
‘m’ Œ˝√ÿ◊ÊŸ ∑§Ë ∞∑§ ª¥Œ ŒÎ…∏ ŒËflÊ⁄U ‚ ‘u’ ªÁà ‚ ≈U∑§⁄UÊÃË „Ò •ÊÒ⁄U ≈U∑§⁄UÊŸ ∑§ ’ÊŒ ©‚Ë ªÁà ‚ flÊÁ¬‚ •ÊÃË „Ò– ŒËflÊ⁄U ∑§ mÊ⁄UÊ ª¥Œ ∑§Ê ÁŒÿÊ ªÿÊ •Êflª „Ò —
(A) 2 mu (B) mu (C) ‡ÊÍãÿ (D) −2 mu
- The Internal Energy of an ideal gas depends upon : 1
(A) temperature only (B) volume only (C) both volume and temperature (D) not on both volume and temperature together
Á∑§‚Ë •ÊŒ‡Ê¸ ªÒ‚ ∑§Ë •ÊãÃÁ⁄U∑§ ™§¡Ê¸ Á∑§‚ ¬⁄U ÁŸ÷¸⁄U ∑§⁄UÃË „Ò?
(A) ∑§fl‹ Ãʬ ¬⁄U (B) ∑§fl‹ •Êÿß ¬⁄U
(C) ŒÊŸÊ¥ Ãʬ fl •Êÿß ¬⁄U (D) ŒÊŸÊ¥ Ãʬ fl •Êÿß ¬⁄U ∞∑§ ‚ÊÕ Ÿ„Ë¥
62 /OSS/2-312-B ]^5 [ Contd...
- Show that for every 1 8 C rise in temperature, the velocity of sound in air increases by 0.61 ms−^1.
ÿ„ Œ‡Êʸßÿ Á∑§ ¬˝Áà 18 C Ãʬ ’…∏Ÿ ¬⁄U flÊÿÈ ◊¥ äflÁŸ ∑§Ê flª 0.61 ms−^1 ’…∏ ¡ÊÃÊ „Ò–
- Draw a graph showing the variation of resistivity of a semiconductor with temperature. 2
Ãʬ ∑§ ‚ÊÕ •h¸øÊ‹∑§ ∑§Ë ¬˝ÁÃ⁄UÊœ∑§ÃÊ ∑§ ¬Á⁄UfløŸ ∑§Ê Œ‡ÊʸŸ ∑§ Á‹∞ ∞∑§ ª˝Ê»§ ’ŸÊßÿ–
- What are main four observations from the experimental study of photo-electric effect?
¬˝∑§Ê‡Ê-ÁfllÈà ¬˝÷Êfl ∑§ ¬˝ÊÿÊÁª∑§ •äÿÿŸ ‚ ∑§ÊÒŸ ‚ øÊ⁄U ◊ÈÅÿ ¬˝ˇÊáÊ ¬˝Êåà „Êà „Ò¥?
- Define (a) coefficient of static friction; and (b) coefficient of kinetic friction. 2
(a) SÕÒÁÃ∑§ ÉÊ·¸áÊ ªÈáÊÊ¥∑§ •ÊÒ⁄U (b) ªÁá ÉÊ·¸áÊ ªÈáÊÊ¥∑§ ∑§Ë ¬Á⁄U÷Ê·Ê ŒËÁ¡∞–
- Draw a vector diagram for three concurrent forces acting at a point in such a way that these forces are in equilibrium.
∞∑§ ‚ÁŒ‡Ê ÁøòÊ ’ŸÊßÿ ¡’Á∑§ ÃËŸ ‚¥ªÊ◊Ë ’‹ ∞∑§ Á’ãŒÈ ¬⁄U ß‚ ¬˝∑§Ê⁄U ‹ªÊ∞ ¡Êà „Ò¥ Á∑§ ÿ ÃËŸÊ¥ ’‹ ‚¥ÃÈ‹Ÿ ◊¥ „Ê¥–
- Draw a schematic diagram of hydraulic jack for raising automobiles to the desired height.
◊Ê≈U⁄U ªÊÁ«∏ÿÊ¥ ∑§Ê ∞∑§ ÁŸÁ‡øà ™°§øÊ߸ Ã∑§ ©∆UÊŸ ∑§ Á‹∞ „Êß«˛UÊÁ‹∑§ ¡Ò∑§ ∑§Ê ∞∑§ ‚◊ÈÁøà ÁøòÊ ’ŸÊßÿ–
- State Zeroth law of Thermodynamics. How many joules of work is equivalent to one calorie of heat?
™§c◊ʪÁÃ∑§Ë ∑§ ‡ÊÍãÿ ∑§ÊÁ≈U ÁŸÿ◊ ∑§Ê ∑§ÕŸ Á‹Áπ∞– ™§c◊Ê ∑§Ë ∞∑§ ∑Ò§‹Ê⁄UË ∑§Êÿ¸ ∑§ Á∑§ÃŸ ¡Í‹ ∑§ ’⁄UÊ’⁄U „ÊÃË „Ò?
- State First Law of Thermodynamics. Write its mathematical form. 2
™§c◊ʪÁÃ∑§Ë ∑§ ¬˝Õ◊ ÁŸÿ◊ ∑§Ê ∑§ÕŸ Á‹Áπ∞– ß‚∑§ ªÁáÊÃËÿ M§¬ ∑§Ê ÷Ë Á‹Áπ∞–
- State two reasons, which were pointed out by Laplace for his correction to the formula for velocity of sound in air given by Newton.
©Ÿ ŒÊ ∑§Ê⁄UáÊÊ¥ ∑§Ê Á‹Áπ∞, Á¡ã„¥ äÿÊŸ ◊¥ ⁄Uπ∑§⁄U ‹Êå‹Ê‚ ∑§Ê flÊÿÈ ◊¥ äflÁŸ ∑§ flª ∑§ Á‹∞ ãÿÍ≈UŸ ∑§Ê ‚ÍòÊ ‚¥‡ÊÊÁœÃ ∑§⁄UŸÊ ¬«∏Ê–
62 /OSS/2-312-B ]^6 [ Contd...
- State de Broglie Hypothesis. Derive an expression for the de Broglie wavelength of an elementary particle of mass ‘m’ and charge ‘q’ and moving with a velocity ‘v’ after being accelerated through a potential difference ‘V’.
Á«U ’˝ÊÇ‹Ë ∑§Ë ¬Á⁄U∑§À¬ŸÊ ∑§Ê Á‹Áπ∞– ∞∑§ ◊Í‹ ∑§áÊ Á¡‚∑§Ê Œ˝√ÿ◊ÊŸ ‘m’, •Êfl‡Ê ‘q’, ‘v’ ªÁà ‚ ø‹Êÿ◊ÊŸ „Ò, ¡’ ©‚ ‘V’ Áfl÷flÊãÃ⁄U ‚ àflÁ⁄Uà Á∑§ÿÊ ¡ÊÃÊ „Ò Á«U ’˝ÊÇ‹Ë Ã⁄¥UªŒÒäÿ¸ ∑§ Á‹∞ √ÿ¥¡∑§ ¬˝Êåà ∑§ËÁ¡∞–
- (a) Show three basic components of a Transistor with the help of a diagram. 4
(b) Draw symbols of n-p-n and p-n-p transistors. (c) Why does the arrow head point ‘outward’ in case of n-p-n transistor; while ‘inward’ in case of p-n-p transistor?
(a) ÁøòÊ ∑§Ë ‚„ÊÿÃÊ ‚ ≈˛UÊ¥Á¡S≈U⁄U ∑§ ÃËŸ ◊ÈÅÿ •flÿflÊ¥ ∑§Ê ÁŒπ‹Êßÿ–
(b) n-p-n •ÊÒ⁄U p-n-p ≈˛UÊ¥Á¡S≈U⁄UÊ¥ ∑§ Á‹∞ ‚Ê¥∑§ÁÃ∑§ ÁŸM§¬áÊ ∑§Ê ’ŸÊßÿ–
(c) n-p-n ≈˛UÊ¥Á¡S≈U⁄U ◊¥ ’ÊáÊʪ˝ “’Ê„⁄U ∑§Ë •Ê⁄U” ¡’Á∑§ p-n-p ≈˛UÊ¥Á¡S≈U⁄U ◊¥ “•ãŒ⁄U ∑§Ë •Ê⁄U” ÄÿÊ¥ „ÊÃÊ „Ò?
- State Newton’s Third Law of Motion. Illustrate it by describing through an example of keeping a book placed on the table. Draw its diagram. What is the vectorial form of Newton’s third law of motion?
ãÿÍ≈UŸ ∑§ ÃË‚⁄U ªÁà ÁŸÿ◊ ∑§Ê Á‹Áπ∞– ß‚ ∞∑§ ©‚ ©ŒÊ„⁄UáÊ ∑§ mÊ⁄UÊ ¬˝ŒÁ‡Ê¸Ã ∑§ËÁ¡∞ ¡’ ∞∑§ ¬ÈSÃ∑§ ∑§Ê ◊$¡ ¬⁄U ⁄UπÊ ¡ÊÃÊ „Ò– ß‚∑§Ê ∞∑§ ÁøòÊ ’ŸÊßÿ–
ãÿÍ≈UŸ ∑§ ÃË‚⁄U ªÁà ÁŸÿ◊ ∑§Ê ‚ÁŒ‡Ê •Á÷M§¬ ÄÿÊ „Ò?
- A body of mass 2 kg is at a height of 10 m above the ground. By applying work-energy principle : (a) Calculate speed of the ball at a height of 6 m from the ground, when it falls freely from top. (b) Calculate speed of the ball, when it reaches the ground after free fall from a height of 10 m. (c) How much work is done by gravitational force in bringing the ball at a height of 10 m from the ground? (d) State whether the work done in (c) will be positive or negative. (Take g=10 ms−^2 )
2 kg Œ˝√ÿ◊ÊŸ ∑§Ê ∞∑§ Á¬¥«U ¡◊ËŸ ‚ 10 m ∑§Ë ™°§øÊ߸ ¬⁄U ⁄UπÊ „È•Ê „Ò– ∑§Êÿ¸-™§¡Ê¸ Á‚hÊãà ∑§Ê ¬˝ÿʪ ∑§⁄Uà „È∞ —
(a) ¡◊ËŸ ‚ 6 m ∑§Ë ™°§øÊ߸ ¬⁄U Á¬¥«U ∑§Ë øÊ‹ ∑§Ë ªáÊŸÊ ∑§ËÁ¡∞, ¡’ fl„ 10 m ‚ ◊ÈÄàÊ M§¬ ‚ Áª⁄UÃÊ „Ò–
(b) 10 m ∑§Ë ™°§øÊ߸ ‚ ◊ÈÄàÊ M§¬ ‚ Áª⁄U ∑§⁄U $¡◊ËŸ ¬⁄U ¬„È°øŸ ¬⁄U Á¬¥«U ∑§Ë øÊ‹ ∑§Ë ªáÊŸÊ ∑§ËÁ¡∞–
(c) ªÈL§àflËÿ ’‹ mÊ⁄UÊ ¡◊ËŸ ‚ 10 m ∑§Ë ™°§øÊ߸ ¬⁄U ‹ ¡ÊŸ ◊¥ Á∑§ÃŸÊ ∑§Êÿ¸ Á∑§ÿÊ ¡Ê∞ªÊ?
(d) ÿ„ ’ËÊßÿ Á∑§ (c) ◊¥ Á∑§ÿÊ ªÿÊ ∑§Êÿ¸ œŸÊà◊∑§ „ÊªÊ ÿÊ ´§áÊÊà◊∑§? (g=10 ms−^2 ∑§Ê ◊ÊŸ ‹ËÁ¡∞)
62 /OSS/2-312-B ]^8 [ Contd...
- What are electric field lines? State their three properties. Draw electric field lines for (a) single positive point charge; and (b) electric dipole.
ÁfllÈà ˇÊòÊ ⁄UπÊ∞° ÄÿÊ „ÊÃË „Ò¥? ©Ÿ∑§ ÃËŸ ªÈáÊœ◊ÊZ ∑§Ê Á‹Áπ∞– (a) œŸÊà◊∑§ ∞∑§‹ Á’ãŒÈ •Êfl‡Ê, •ÊÒ⁄U (b) ÁfllÈà Ámœ˝Èfl ∑§ Á‹∞ ÁfllÈà ˇÊòÊ ⁄UπÊ∞° πË¥Áø∞–
- (a) Explain the phenomenon of ‘scattering of light’. 6
(b) State ‘Rayleigh’s law of scattering’. (c) Explain the red colour of the sun at sunrise and sunset. Draw a diagram.
(a) “¬˝∑§Ê‡Ê ∑§ ¬˝∑§ËáʸŸ” ∑§Ë ¬Á⁄UÉÊ≈UŸÊ ∑§Ë √ÿÊÅÿÊ ∑§ËÁ¡∞–
(b) “⁄ÒU‹ ∑§ ¬˝∑§ËáʸŸ ÁŸÿ◊” ∑§Ê ∑§ÕŸ Á‹Áπ∞–
(c) ß‚ Ãâÿ ∑§Ë √ÿÊÅÿÊ ∑§ËÁ¡∞ Á∑§ ‚ÍÿʸŒÿ fl ‚ÍÿʸSà ∑§ ‚◊ÿ ‚Íÿ¸ ‹Ê‹ ⁄¥Uª ∑§Ê ÄÿÊ¥ ÁŒπÊ߸ ŒÃÊ „Ò? ß‚∑§ Á‹∞ ∞∑§ ÁøòÊ ’ŸÊßÿ–
- Sir C.V. Raman was awarded Nobel prize in Physics in 1930 for the discovery of ‘Raman Effect’. (a) State ‘Raman Effect’, with its simple theoretical explanation. (b) Calculate refractive index of an equilateral prism, if the angle of minimum deviation is equal to the angle of prism.
‚⁄U ‚Ë.flË. ⁄U◊Ÿ ∑§Ê 1930 ◊¥ ÷ÊÒÁÃ∑§Ë ∑§Ê ŸÊ’‹ ¬È⁄US∑§Ê⁄U “⁄U◊Ÿ ¬˝÷Êfl” ∑§Ë πÊ¡ ∑§ Á‹∞ ¬˝ŒÊŸ Á∑§ÿÊ ªÿÊ ÕÊ–
(a) “⁄U◊Ÿ ¬˝÷Êfl” ∑§ ’Ê⁄U ◊¥ ’ËÊßÿ •ÊÒ⁄U ‚ÊÕ ◊¥ ß‚∑§Ë ‚⁄U‹ ‚ÒhÊÁãÃ∑§ √ÿÊÅÿÊ ∑§ËÁ¡∞–
(b) Á∑§‚Ë ‚◊’Ê„È Á¬˝í◊ ∑§ ¬ŒÊÕ¸ ∑§ •¬fløŸÊ¥∑§ ∑§Ê ¬Á⁄U∑§‹Ÿ ∑§ËÁ¡∞, ¡’ ãÿÍŸÃ◊ Áflø‹Ÿ ∑§ÊáÊ •ÊÒ⁄U Á¬˝í◊ ∑§ÊáÊ ∞∑§ ŒÍ‚⁄U ∑§ ’⁄UÊ’⁄U „Ê–
62 /OSS/2-312-C ]^1 [ Contd...
This Question Paper consists of 30 questions including 1 figure and 8 printed pages.
ß‚ ¬˝‡Ÿ-¬òÊ ◊¥ 30 ¬˝‡Ÿ ∑§ 8 ◊ÈÁŒ˝Ã ¬Îc∆U U •ÊÒ⁄U 1 •Ê∑ΧÃË „Ò¥–
Roll No.
•ŸÈ∑˝§◊Ê¥∑§
Code No.
∑§Ê«U Ÿ¥.^62 /OSS/^2
PHYSICS
(÷ÊÒÁÃ∑§ ÁflôÊÊŸ)
Day and Date of Examination
¬⁄UˡÊÊ ∑§Ê ÁŒŸ fl ÁŒŸÊ¥∑§
Signature of Invigilators 1. ÁŸ⁄UˡÊ∑§Ê¥ ∑§ „SÃÊˇÊ⁄U
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‚Ê◊Êãÿ •ŸÈŒ‡Ê —
- ¬⁄UˡÊÊÕ˸ ¬˝‡Ÿ¬òÊ ∑§ § ¬„‹ ¬Îc∆U ¬⁄U •¬ŸÊ •ŸÈ∑˝§◊Ê¥∑§ •fl‡ÿU Á‹π¥–
- ∑Χ¬ÿÊ ¬˝‡Ÿ¬òÊ ∑§Ê ¡ÊÚ°ø ‹¥ Á∑§ ¬˝‡Ÿ¬òÊ ∑§ ∑ȧ‹ ¬Îc∆UÊ¥ ÃÕÊ ¬˝‡ŸÊ¥ ∑§Ë ©ÃŸË „Ë ‚¥ÅUÿÊ „Ò Á¡ÃŸË ¬˝Õ◊ ¬Îc∆ ∑ §‚’‚ ™§¬⁄U ¿U¬Ë „Ò– ß‚ ’ÊÃ
∑§Ë ¡ÊÚ°ø ÷Ë ∑§⁄U ‹¥ Á∑§ ¬˝‡Ÿ ∑˝ Á◊∑§ UM§¬ ◊¥ „Ò¥–
- § ©ûÊ⁄U-¬ÈÁSUÃ∑§Ê ◊¥ ¬„øÊŸ-Áøq ’ŸÊŸ •ÕflÊ ÁŸÁŒ¸c≈U SÕÊŸÊ¥ ∑§§ •ÁÃÁ⁄UÄà ∑§„Ë¥ ÷Ë •ŸÈ∑˝§◊Ê¥∑§ Á‹πŸ ¬⁄U ¬⁄UˡÊÊÕ˸ ∑§Ê •ÿÊÇÿ ∆U„⁄UÊÿÊ
¡ÊÿªÊ–
- •¬ŸË ©ûÊ⁄U-¬ÈÁSUÃ∑§Ê ¬⁄U ¬˝‡Ÿ¬òÊ ∑§Ë ∑§Ê«U ‚¥ÅÿÊ 62 /OSS/ 2 - C Á‹π¥–
- (∑§) ¬˝‡Ÿ¬òÊ ∑§fl‹ Á„¥ŒË/•¥ª˝¡Ë ◊¥ „Ò– Á»§⁄U ÷Ë, ÿÁŒ •Ê¬ øÊ„¥ ÃÊ ŸËø ŒË ªß¸ Á∑§‚Ë ∞∑§ ÷Ê·Ê ◊¥ ©ûÊ⁄ Œ ‚∑§Ã „Ò¥ —
•¥ª˝¡Ë, Á„¥ŒË, ©ŒÍ¸, ¬¥¡Ê’Ë, ’°ª‹Ê, ÃÁ◊‹, ◊‹ÿÊ‹◊, ∑§ãŸ«∏, ËȪÈ, ◊⁄UÊ∆UË, ©Á«∏ÿÊ, ªÈ¡⁄UÊÃË, ∑§Ê¥∑§áÊË, ◊ÁáʬÈ⁄UË, •‚Á◊ÿÊ, Ÿ¬Ê‹Ë, ∑§‡◊Ë⁄UË, ‚¥S∑Χç•ÊÒ⁄U Á‚¥œË– ∑Χ¬ÿÊ ©ûÊ⁄U-¬ÈÁSÃ∑§Ê ◊¥ ÁŒ∞ ª∞ ’ÊÚÄ‚ ◊¥ Á‹π¥ Á∑§ •Ê¬ Á∑§‚ ÷Ê·Ê ◊¥ ©ûÊ⁄U Á‹π ⁄U„ „Ò¥– § (π) ÿÁŒ •Ê¬ Á„¥ŒË ∞fl¥ •¥ª˝¡Ë ∑§ •ÁÃÁ⁄UÄà Á∑§‚Ë •ãÿ ÷Ê·Ê ◊¥ ©ûÊ⁄U Á‹πà „Ò¥ ÃÊ ¬˝‡Ÿ ∑§Ê ‚◊¤ÊŸ ◊¥ „ÊŸ flÊ‹Ë òÊÈÁ≈UÿÊ¥/ª‹ÁÃÿÊ¥ ∑§Ë Á¡ê◊UŒÊ⁄Ë ∑ fl‹ •Ê¬∑§Ë „ʪ˖
Set/ ‚≈U C
62 /OSS/2-312-C ]^3 [ Contd...
- The given P-V diagram show for the expansion of a gas. 1
Which one of the following statements is true? (A) A is isothermal process, while B is adiabatic process (B) A is adiabatic process, while B is isothermal process (C) Both are isothermal processes (D) Both are adiabatic processes ÁŒÿÊ „È•Ê P-V •Ê⁄Uπ ªÒ‚ ∑§ ¬˝‚Ê⁄U ∑§ Á‹∞ „Ò? ŸËø ÁŒ∞ ª∞ ∑§ÕŸÊ¥ ◊¥ ‚ ∑§ÊÒŸ-‚Ê ‚„Ë „Ò?
(A) A ‚◊ÃÊ¬Ë ¬˝∑˝§◊ „Ò, ¡’Á∑§ B L§hÊc◊ ¬˝∑˝§◊ „Ò
(B) A L§hÊc◊ ¬˝∑˝§◊ „Ò, ¡’Á∑§ B ‚◊ÃÊ¬Ë ¬˝∑˝§◊ „Ò (C) ŒÊŸÊ¥ „Ë ‚◊ÃÊ¬Ë ¬˝∑˝§◊ „¥Ò
(D) ŒÊŸÊ¥ „Ë L§hÊc◊ ¬˝∑˝§◊ „Ò¥
- Sound waves travel fastest in : 1
(A) Solids (B) Liquids (C) Gases (D) Vacuum äflÁŸ ∑§Ë Ã⁄¥Uª¥ ∑§ÊÒŸ ‚ ◊Êäÿ◊ ◊¥ ‚’‚ Ã$¡ ªÁà ‚ ‚¥ø⁄UáÊ ∑§⁄UÃË „Ò¥? (A) ∆UÊ‚ (B) Œ˝fl (C) ªÒ‚ (D) ÁŸflʸÃ
- The ratio of frequencies of second and third harmonics of standing waves in a pipe closed at one end is : (A) 1 : 2 (B) 1 : 3 (C) 2 : 3 (D) 3 : 5 ∞∑§ Á‚⁄U ¬⁄U ’¥Œ ¬Ê߬ ◊¥ ¡ÁŸÃ •¬˝ªÊ◊Ë Ã⁄¥UªÊ¥ ∑§ ÁmÃËÿ fl ÃÎÃËÿ ‚¥ŸÊŒÊ¥ ∑§Ë •ÊflÎÁûÊÿÊ¥ ∑§Ê •ŸÈ¬Êà „Ò —
(A) 1 : 2 (B) 1 : 3 (C) 2 : 3 (D) 3 : 5
62 /OSS/2-312-C ]^4 [ Contd...
- An optically active substance : 1
(A) rotates the plane of polarised light (B) changes the direction of polarised light (C) does not allow plane polarised light to pass through it (D) none of these ∞∑§ ¬˝∑§ÊÁ‡Ê∑§Ëÿ ¬ŒÊÕ¸ —
(A) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§ Ë ∑§Ê ÉÊÈ◊ÊÃÊ „Ò
(B) œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ë ÁŒ‡ÊÊ ∑§Ê ’Œ‹ÃÊ „Ò (C) ‚◊Ë œ˝ÈÁflà ¬˝∑§Ê‡Ê ∑§Ê ß‚◊¥ ‚ ªÈ¡⁄UŸ Ÿ„Ë¥ ŒÃÊ
(D) ߟ◊¥ ‚ ∑§Ê߸ Ÿ„Ë¥
- In nuclear reactions, there is a conservation of : 1
(A) Mass only (B) Energy only (C) Momentum only (D) Mass, Energy and Momentum ŸÊÁ÷∑§Ëÿ •Á÷Á∑˝§ÿÊ ◊¥ ‚¥⁄UˇÊáÊ „ÊÃÊ „Ò — (A) ∑§fl‹ Œ˝√ÿ◊ÊŸ ∑§Ê (B) ∑§fl‹ ™§¡Ê¸ ∑§Ê
(C) ∑§fl‹ ‚¥flª ∑§Ê (D) Œ˝√ÿ◊ÊŸ, ™§¡Ê¸ •ÊÒ⁄U ‚¥flª ∑§Ê
- Which of the following spectral series falls within visible region of electromagnetic radiation? (A) Lyman series (B) Balmer series (C) Paschen series (D) Pfund series ŸËø ÁŒ∞ „È∞ ◊¥ ‚ ∑§ÊÒŸ ‚Ë S¬Ä≈˛U‹ üÊáÊË ÁfllÈÃ-øÈê’∑§Ëÿ ÁflÁ∑§⁄UáÊÊ¥ ∑§ ŒÎ‡ÿ ÷ʪ ∑§ •ãê¸Ã •ÊÃË „Ò?
(A) ‹Êß◊Ÿ üÊáÊË (B) ’Ê◊⁄U üÊáÊË (C) ¬Ê‡øŸ üÊáÊË (D) »¥§«U üÊáÊË
- The refractive index of glass is 1.5 for light waves of λ=6000 Å in vacuum. Its wavelength in glass is : (A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å ÁŸflʸà ◊¥ λ=6000 Å ¬˝∑§Ê‡Ê ∑§Ë Á∑§⁄UáÊÊ¥ ∑§ Á‹∞ ∑§Ê°ø ∑§Ê •¬fløŸÊ¥∑§ 1.5 „Ò– ∑§Ê°ø ◊¥ ß‚∑§Ë Ã⁄¥UªŒÒäÿ¸ ∑§Ê ◊ÊŸ „Ò — (A) 9000 Å (B) 4000 Å (C) 6000 Å (D) 3000 Å
- A ball of mass ‘m’ strikes a rigid wall with speed ‘u’ and rebounds back with the same speed. The impulse imparted to the ball by the wall is : (A) 2 mu (B) mu (C) zero (D) −2 mu ‘m’ Œ˝√ÿ◊ÊŸ ∑§Ë ∞∑§ ª¥Œ ŒÎ…∏ ŒËflÊ⁄U ‚ ‘u’ ªÁà ‚ ≈U∑§⁄UÊÃË „Ò •ÊÒ⁄U ≈U∑§⁄UÊŸ ∑§ ’ÊŒ ©‚Ë ªÁà ‚ flÊÁ¬‚ •ÊÃË „Ò– ŒËflÊ⁄U ∑§ mÊ⁄UÊ ª¥Œ ∑§Ê ÁŒÿÊ ªÿÊ •Êflª „Ò —
(A) 2 mu (B) mu (C) ‡ÊÍãÿ (D) −2 mu
