# Riddle Resolved : 12th physics students ignored text book, questions perfectly in syllabus, claims teacher

Nagpur News: Amidst the growing dissent among the 12^{th} students regarding the ‘changed’ physics question paper that left large number of students wondering for answers, an expert has claimed that Tuesday’s board paper for physics is perfectly within syllabus. Not only he claimed but the has provided the set of answers for the questions asked from the Physics XII board text book published by Maharashtra State Board of Secondary and Higher Secondary Education, Pune.

Panini Telang, a physics teacher and director at Pioneer Tutorials near Mate square said that

**Physics Question paper has been completely and correctly given by the board , it is not out of the syllabus. **

He said that students are earnestly requested to go through the description below and check the answers of the questions asked in the board examination from the Physics XII board book published by Maharashtra State Board of Secondary and higher secondary education, Pune. The students will definitely realize that they have not read the book and were more dependent on the notes of tuition classes or guides because of which they are facing problems today and are feeling that board has set the question paper out of syllabus. Rather they should blame their tuition class teachers who have not guided them properly and rightly. Probably, the students have prepared very less through guides and notes of tuition classes and were expecting the same to come in the examination which did not happened , therefore they are feeling question paper to be out of syllabus.

Dear students , please verify the following details and be fair enough in analyzing your faults.

** Section- I**

**Each question carries 1 Mark (total 7 Marks)**

Q1(i) page 42 Parallel axes theorem application chapter 3 Rotational motion (theory)

Q1(ii) page 105 see solved problem 5, chapter 6 Surface tension. (theory)

Q1(iii) page 86 equation 5.23, chapter 5, Elasticity (theory)

Q1(iv) page 111, 3^{rd} paragraph, chapter 7, Wave motion (theory)

Q1(v) page 145, diatomic gases, chapter 9, Kinetic theory of gases. (theory)

Q1(vi) page 58, based on equation 4.10, chapter 4, oscillation. (theory)

Q1(vii) page 150, based on Wien’s Law, chapter 9, Kinetic theory of gases. (numerical)

**Each question carries 2 Mark (total 12 Marks) any six to be solved out of 8 questions **

Q2(i) page 25,chapter 2, Gravitation (theory)

Q2(ii) similar to problem 3 problems for practice only changed values, chapter 1, Circular Motion. (numerical)

Q2(iii) page 149, figure 9.5, Chapter 9, Kinetic theory of gases. (theory)

Q2(iv) application of damped oscillation as undamped , page 68 and page 60 similar problem is not given in the book , neither solved nor unsolved, but can be considered to be based on concepts (numerical)

Q2(v) page 127-128, chapter 8 Stationary waves (theory)

Q2(vi) page 102 printed in blue colour formula, chapter 6, Surface tension. (numerical)

Q2(vii) page96, Chapter 6, Surface tension. (theory)

Q2 (viii) similar to solved problem 6, page 51, chapter 3, Rotational motion (numerical)

**Attempt any three out of four each carrying weightage of 3 marks each, total marks 9:**

Q3 (i) page 14, chapter 1, Circular motion. (theory)

Q3(ii) page 29, based on equation 2.27, chapter 2, Gravitation (numerical)

Q3 (iii) page 41, chapter 3, Rotational motion (theory)

Q3 (iv) page 87, based on equation 5.38, chapter 5, Elasticity (numerical)

Q4 see page 66 & 67, chapter 4 , Oscillation (theory) & numerical based on equation 7.20, chapter 7, Wave motion.

**OR**

Q4 see page 125- 126 of chapter 8, Stationary waves (theory) & numerical based on equation at bottom, on page 143, chapter 9, Kinetic Theory of gases.

** Section-II**

**Each question carries 1 Mark (total 7 Marks)**

Q5 (i) see page 178-179, chapter 11, Interference & Diffraction (theory)

Q5 (ii) see page 213, chapter 13, Current electricity (theory)

Q5 (iii) see page 286, point (iii) particle nature of light, chapter 17, Electron and Photons (theory)

Q5 (iv) see definition of isotopes, page 297, chapter 18, Atoms, Molecules and nuclei (theory)

Q5 (v) see Berkhausen condition page 324, chapter 19, semiconductors (theory)

Q5 (vi) see definition of demodulation, Page 331, chapter 20, communication systems (theory)

Q5 (vii) based on equation 16.23 take x_{c=0}, Page 269, chapter 16, Electromagnetic Induction (numerical)

**Each question carries 2 Mark (total 12 Marks) any six to be solved out of 8 questions **

Q6 (i) see page 199 & 201 figures 12.16 & 12.17 chapter 12, Electrostatics (theory)

Q6 (ii) see page 187, similar to unsolved problem 5 values different, chapter 11, Interference & Diffraction (numerical)

Q6 (iii) see page 239, chapter 14, Magnetic effect of electric current, (theory)

Q6 (iv) see page 241, equation 14.48 on which the problem is based, chapter 14 Magnetic Effect of Electric current (numerical)

Q6 (v)see page 248, chapter 15, Magnetism (theory)

Q6(vi) see page 202 equation 12.73 to solve problem, chapter 12, Electrostatics (numerical)

Q6 (vii) see page 339, chapter 20, Communication systems (theory)

Q6 (viii) see page 294, equation 18.17 , chapter 18, Atoms, Molecules and Nuclei (numerical)

**Attempt any three out of four each carrying weightage of 3 marks each, total marks 9:**

Q7 (i) see page 315, chapter19, semiconductors (theory)

Q7 (ii) see page 227, similar to solved problem 11, chapter13, Current electricity, (numerical)

Q7 (iii) see page 300, chapter 18 , Atoms, Molecules and Nuclei (theory)

Q7 (iv) see page 284, problem based on equation 17.3, chapter 17, Electron and Photons, (numerical)

**Q8 **See page 256-257-258 for theory question, chapter 16, Electromagnetic induction and for problem see page 254 , solved problem 3, chapter 15, Magnetism

**OR**

Q8 see page 163-164 , chapter 10, Wave theory of light for the first theory question and see page 185 solved problem 12, chapter 11, Interference and Diffraction, for numerical

From the above analysis it is crystal clear that the board has set the question paper as per the syllabus, as per the distribution of marks for problems and theory, as per chapterwise distribution of marks but still I feel that there is some injustice made to the students by allotting less duration of time as compared to the last year examinations.

Last year for 40 marks students were given 2 hours to solve the question paper so for 70 marks they should have given three and half hour, but they were just given three hours because of which most of the students were unable to complete the paper.

Panini Telang added, “Hence I appeal to the government in favor of students that they should be liberal enough to declare students pass in physics paper.”