Physics Past Year Paper (Delhi Set -1) - 2015, Class 12, CBSE Class 12 Notes | EduRev

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Class 12 : Physics Past Year Paper (Delhi Set -1) - 2015, Class 12, CBSE Class 12 Notes | EduRev

 Page 1


55/1/1/D 1 [P.T.O.
¸üÖê»Ö ®ÖÓ.
Roll No. 
³ÖÖîןÖÛú ×¾Ö–ÖÖ®Ö (ÃÖî¨üÖ×®ŸÖÛú) 
PHYSICS (Theory)  
×®Ö¬ÖÖÔ׸üŸÖ ÃÖ´ÖµÖ  : 3 ‘ÖÓ™êü ] [ †×¬ÖÛúŸÖ´Ö †ÓÛú  : 70
Time allowed : 3 hours ] [ Maximum Marks : 70 
ÃÖÖ´ÖÖ®µÖ ×®Ö¤ìü¿Ö    : : : :
(i) ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë Ûãú»Ö 26 ¯ÖÏ¿®Ö Æïü … ÃÖ³Öß ¯ÖÏ¿®Ö †×®Ö¾ÖÖµÖÔ Æïü …  
(ii) ‡ÃÖ ¯ÖÏ¿®Ö ¯Ö¡Ö Ûêú 5 ³ÖÖÝÖ Æïü : ÜÖÞ›ü-Ûú, ÜÖÞ›ü-ÜÖ, ÜÖÞ›ü-ÝÖ, ÜÖÞ›ü-‘Ö †Öî¸ü ÜÖÞ›ü-’û … 
(iii) ÜÖÞ›ü-Ûú ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 1 †ÓÛú ÛúÖ, ÜÖÞ›ü-ÜÖ ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 2 †ÓÛú Ûêú, ÜÖÞ›ü-ÝÖ ´Öë 12 ¯ÖÏ¿®Ö 
¯ÖÏŸµÖêÛú 3 †ÓÛú Ûêú, ÜÖÞ›ü-‘Ö ´Öë 4 †ÓÛú ÛúÖ ‹Ûú ´Ö滵ÖÖ¬ÖÖ׸üŸÖ ¯ÖÏ¿®Ö †Öî¸ü ÜÖÞ›ü-’û ´Öë 3 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 5 †ÓÛú 
Ûêú פü‹ ÝÖ‹ Æïü … 
(iv) ÃÖ´ÖÝÖÏ ¯Ö¸ü ÛúÖê‡Ô ×¾ÖÛú»¯Ö ®ÖÆüà Æîü … ×±ú¸ü ³Öß 2 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö, 3 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö †Öî¸ü 5 †ÓÛúÖë Ûêú 3 ¯ÖÏ¿®ÖÖë 
´Öë ³Öߟָüß ×¾ÖÛú»¯Ö פü‹ ÝÖ‹ Æïü … ‹êÃÖê ¯ÖÏ¿®ÖÖë ´Öë †Ö¯ÖÛúÖê ×¾ÖÛú»¯ÖÖë ´Öë ÃÖê ‹Ûú ÛúÖê Æü»Ö Ûú¸ü®ÖÖ Æîü … 
 Series : SSO/1 
55/1/1/D
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ´ÖãצüŸÖ ¯Öéšü 16 Æïü …
• ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ¤üÖ×Æü®Öê ÆüÖ£Ö Ûúß †Öê¸ü פü‹ ÝÖ‹ ÛúÖê›ü ®Ö´²Ö¸ü ÛúÖê ”ûÖ¡Ö ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü ¯Ö¸ü ×»ÖÜÖë …
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë 26 ¯ÖÏ¿®Ö Æïü …
• Ûéú¯ÖµÖÖ ¯ÖÏ¿®Ö ÛúÖ ˆ¢Ö¸ü ×»ÖÜÖ®ÖÖ ¿Öãºþ Ûú¸ü®Öê ÃÖê ¯ÖÆü»Öê, ¯ÖÏ¿®Ö ÛúÖ ÛÎú´ÖÖÓÛú †¾Ö¿µÖ ×»ÖÜÖë …
• ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌü®Öê Ûêú ×»Ö‹ 15 ×´Ö®Ö™ü ÛúÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÝÖµÖÖ Æîü … ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖ ×¾ÖŸÖ¸üÞÖ ¯Öæ¾ÖÖÔÆËü®Ö ´Öë 10.15 ²Ö•Öê
×ÛúµÖÖ •ÖÖµÖêÝÖÖ … 10.15 ²Ö•Öê ÃÖê 10.30 ²Ö•Öê ŸÖÛú ”ûÖ¡Ö Ûêú¾Ö»Ö ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌëüÝÖê †Öî¸ü ‡ÃÖ †¾Ö×¬Ö Ûêú ¤üÖî¸üÖ®Ö ¾Öê
ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ ¯Ö¸ü ÛúÖê‡Ô ˆ¢Ö¸ü ®ÖÆüà ×»ÖÜÖëÝÖê …
• Please check that this question paper contains 16 printed pages.
• Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• Please write down the Serial Number of the question before attempting it.
• 15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the
question paper only and will not write any answer on the answer-book during this period.
ÛúÖê›ü ®ÖÓ. 
Code No. 
¯Ö¸üßõÖÖ£Öá ÛúÖê›ü ÛúÖê ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü 
¯Ö¸ü †¾Ö¿µÖ ×»ÖÜÖë … 
Candidates must write the Code on 
the title page of the answer-book.
SET – 1 
Page 2


55/1/1/D 1 [P.T.O.
¸üÖê»Ö ®ÖÓ.
Roll No. 
³ÖÖîןÖÛú ×¾Ö–ÖÖ®Ö (ÃÖî¨üÖ×®ŸÖÛú) 
PHYSICS (Theory)  
×®Ö¬ÖÖÔ׸üŸÖ ÃÖ´ÖµÖ  : 3 ‘ÖÓ™êü ] [ †×¬ÖÛúŸÖ´Ö †ÓÛú  : 70
Time allowed : 3 hours ] [ Maximum Marks : 70 
ÃÖÖ´ÖÖ®µÖ ×®Ö¤ìü¿Ö    : : : :
(i) ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë Ûãú»Ö 26 ¯ÖÏ¿®Ö Æïü … ÃÖ³Öß ¯ÖÏ¿®Ö †×®Ö¾ÖÖµÖÔ Æïü …  
(ii) ‡ÃÖ ¯ÖÏ¿®Ö ¯Ö¡Ö Ûêú 5 ³ÖÖÝÖ Æïü : ÜÖÞ›ü-Ûú, ÜÖÞ›ü-ÜÖ, ÜÖÞ›ü-ÝÖ, ÜÖÞ›ü-‘Ö †Öî¸ü ÜÖÞ›ü-’û … 
(iii) ÜÖÞ›ü-Ûú ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 1 †ÓÛú ÛúÖ, ÜÖÞ›ü-ÜÖ ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 2 †ÓÛú Ûêú, ÜÖÞ›ü-ÝÖ ´Öë 12 ¯ÖÏ¿®Ö 
¯ÖÏŸµÖêÛú 3 †ÓÛú Ûêú, ÜÖÞ›ü-‘Ö ´Öë 4 †ÓÛú ÛúÖ ‹Ûú ´Ö滵ÖÖ¬ÖÖ׸üŸÖ ¯ÖÏ¿®Ö †Öî¸ü ÜÖÞ›ü-’û ´Öë 3 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 5 †ÓÛú 
Ûêú פü‹ ÝÖ‹ Æïü … 
(iv) ÃÖ´ÖÝÖÏ ¯Ö¸ü ÛúÖê‡Ô ×¾ÖÛú»¯Ö ®ÖÆüà Æîü … ×±ú¸ü ³Öß 2 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö, 3 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö †Öî¸ü 5 †ÓÛúÖë Ûêú 3 ¯ÖÏ¿®ÖÖë 
´Öë ³Öߟָüß ×¾ÖÛú»¯Ö פü‹ ÝÖ‹ Æïü … ‹êÃÖê ¯ÖÏ¿®ÖÖë ´Öë †Ö¯ÖÛúÖê ×¾ÖÛú»¯ÖÖë ´Öë ÃÖê ‹Ûú ÛúÖê Æü»Ö Ûú¸ü®ÖÖ Æîü … 
 Series : SSO/1 
55/1/1/D
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ´ÖãצüŸÖ ¯Öéšü 16 Æïü …
• ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ¤üÖ×Æü®Öê ÆüÖ£Ö Ûúß †Öê¸ü פü‹ ÝÖ‹ ÛúÖê›ü ®Ö´²Ö¸ü ÛúÖê ”ûÖ¡Ö ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü ¯Ö¸ü ×»ÖÜÖë …
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë 26 ¯ÖÏ¿®Ö Æïü …
• Ûéú¯ÖµÖÖ ¯ÖÏ¿®Ö ÛúÖ ˆ¢Ö¸ü ×»ÖÜÖ®ÖÖ ¿Öãºþ Ûú¸ü®Öê ÃÖê ¯ÖÆü»Öê, ¯ÖÏ¿®Ö ÛúÖ ÛÎú´ÖÖÓÛú †¾Ö¿µÖ ×»ÖÜÖë …
• ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌü®Öê Ûêú ×»Ö‹ 15 ×´Ö®Ö™ü ÛúÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÝÖµÖÖ Æîü … ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖ ×¾ÖŸÖ¸üÞÖ ¯Öæ¾ÖÖÔÆËü®Ö ´Öë 10.15 ²Ö•Öê
×ÛúµÖÖ •ÖÖµÖêÝÖÖ … 10.15 ²Ö•Öê ÃÖê 10.30 ²Ö•Öê ŸÖÛú ”ûÖ¡Ö Ûêú¾Ö»Ö ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌëüÝÖê †Öî¸ü ‡ÃÖ †¾Ö×¬Ö Ûêú ¤üÖî¸üÖ®Ö ¾Öê
ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ ¯Ö¸ü ÛúÖê‡Ô ˆ¢Ö¸ü ®ÖÆüà ×»ÖÜÖëÝÖê …
• Please check that this question paper contains 16 printed pages.
• Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• Please write down the Serial Number of the question before attempting it.
• 15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the
question paper only and will not write any answer on the answer-book during this period.
ÛúÖê›ü ®ÖÓ. 
Code No. 
¯Ö¸üßõÖÖ£Öá ÛúÖê›ü ÛúÖê ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü 
¯Ö¸ü †¾Ö¿µÖ ×»ÖÜÖë … 
Candidates must write the Code on 
the title page of the answer-book.
SET – 1 
55/1/1/D 2 
(v) •ÖÆüÖÑ †Ö¾Ö¿µÖÛú ÆüÖê, ¾ÖÆüÖÑ †Ö¯Ö ³ÖÖîןÖÛ †“Ö¸üÖë Ûêú ×®Ö´®Ö×»Ö×ÜÖŸÖ ´Ö滵ÖÖë ÛúÖ ˆ¯ÖµÖÖêÝÖ Ûú¸ü ÃÖÛúŸÖê Æïü :
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
®µÖæ™ÒüÖò®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.675 × 10
–27
 kg 
¯ÖÏÖê™üÖê®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.673 × 10
–27
 kg 
‹ê¾ÖÖêÝÖê›ÒüÖê ÃÖÓܵÖÖ = 6.023 × 10
23
 ¯ÖÏ×ŸÖ ÝÖÏÖ´Ö ´ÖÖê»Ö 
²ÖÖò»™Ëü•ÖÌ´ÖÖ®Ö ×®ÖµÖŸÖÖÓÛú = 1.38 × 10
–23
 JK
–1
 
General Instructions : 
(i) There are 26 questions in all. All questions are compulsory.  
(ii) This question paper has five sections : Section A, Section B, Section C, Section D 
and Section E. 
(iii) Section A contains five questions of one mark each, Section B contains five 
questions of two marks each, Section C contains twelve questions of three marks 
each, Section D contains one value based question of four marks and Section E 
contains three questions of five marks each. 
(iv) There is no overall choice. However, an internal choice has been provided in one 
question of two marks, one question of three marks and all the three questions of 
five marks weightage. You have to attempt only one of the choices in such 
questions. 
(v) You may use the following values of physical constants wherever necessary : 
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
mass of neutron = 1.675 × 10
–27
 kg 
mass of proton = 1.673 × 10
–27
 kg 
Avogadro’s number = 6.023 × 10
23
 per gram mole 
Boltzmann constant = 1.38 × 10
–23
 JK
–1
 
Page 3


55/1/1/D 1 [P.T.O.
¸üÖê»Ö ®ÖÓ.
Roll No. 
³ÖÖîןÖÛú ×¾Ö–ÖÖ®Ö (ÃÖî¨üÖ×®ŸÖÛú) 
PHYSICS (Theory)  
×®Ö¬ÖÖÔ׸üŸÖ ÃÖ´ÖµÖ  : 3 ‘ÖÓ™êü ] [ †×¬ÖÛúŸÖ´Ö †ÓÛú  : 70
Time allowed : 3 hours ] [ Maximum Marks : 70 
ÃÖÖ´ÖÖ®µÖ ×®Ö¤ìü¿Ö    : : : :
(i) ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë Ûãú»Ö 26 ¯ÖÏ¿®Ö Æïü … ÃÖ³Öß ¯ÖÏ¿®Ö †×®Ö¾ÖÖµÖÔ Æïü …  
(ii) ‡ÃÖ ¯ÖÏ¿®Ö ¯Ö¡Ö Ûêú 5 ³ÖÖÝÖ Æïü : ÜÖÞ›ü-Ûú, ÜÖÞ›ü-ÜÖ, ÜÖÞ›ü-ÝÖ, ÜÖÞ›ü-‘Ö †Öî¸ü ÜÖÞ›ü-’û … 
(iii) ÜÖÞ›ü-Ûú ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 1 †ÓÛú ÛúÖ, ÜÖÞ›ü-ÜÖ ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 2 †ÓÛú Ûêú, ÜÖÞ›ü-ÝÖ ´Öë 12 ¯ÖÏ¿®Ö 
¯ÖÏŸµÖêÛú 3 †ÓÛú Ûêú, ÜÖÞ›ü-‘Ö ´Öë 4 †ÓÛú ÛúÖ ‹Ûú ´Ö滵ÖÖ¬ÖÖ׸üŸÖ ¯ÖÏ¿®Ö †Öî¸ü ÜÖÞ›ü-’û ´Öë 3 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 5 †ÓÛú 
Ûêú פü‹ ÝÖ‹ Æïü … 
(iv) ÃÖ´ÖÝÖÏ ¯Ö¸ü ÛúÖê‡Ô ×¾ÖÛú»¯Ö ®ÖÆüà Æîü … ×±ú¸ü ³Öß 2 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö, 3 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö †Öî¸ü 5 †ÓÛúÖë Ûêú 3 ¯ÖÏ¿®ÖÖë 
´Öë ³Öߟָüß ×¾ÖÛú»¯Ö פü‹ ÝÖ‹ Æïü … ‹êÃÖê ¯ÖÏ¿®ÖÖë ´Öë †Ö¯ÖÛúÖê ×¾ÖÛú»¯ÖÖë ´Öë ÃÖê ‹Ûú ÛúÖê Æü»Ö Ûú¸ü®ÖÖ Æîü … 
 Series : SSO/1 
55/1/1/D
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ´ÖãצüŸÖ ¯Öéšü 16 Æïü …
• ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ¤üÖ×Æü®Öê ÆüÖ£Ö Ûúß †Öê¸ü פü‹ ÝÖ‹ ÛúÖê›ü ®Ö´²Ö¸ü ÛúÖê ”ûÖ¡Ö ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü ¯Ö¸ü ×»ÖÜÖë …
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë 26 ¯ÖÏ¿®Ö Æïü …
• Ûéú¯ÖµÖÖ ¯ÖÏ¿®Ö ÛúÖ ˆ¢Ö¸ü ×»ÖÜÖ®ÖÖ ¿Öãºþ Ûú¸ü®Öê ÃÖê ¯ÖÆü»Öê, ¯ÖÏ¿®Ö ÛúÖ ÛÎú´ÖÖÓÛú †¾Ö¿µÖ ×»ÖÜÖë …
• ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌü®Öê Ûêú ×»Ö‹ 15 ×´Ö®Ö™ü ÛúÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÝÖµÖÖ Æîü … ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖ ×¾ÖŸÖ¸üÞÖ ¯Öæ¾ÖÖÔÆËü®Ö ´Öë 10.15 ²Ö•Öê
×ÛúµÖÖ •ÖÖµÖêÝÖÖ … 10.15 ²Ö•Öê ÃÖê 10.30 ²Ö•Öê ŸÖÛú ”ûÖ¡Ö Ûêú¾Ö»Ö ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌëüÝÖê †Öî¸ü ‡ÃÖ †¾Ö×¬Ö Ûêú ¤üÖî¸üÖ®Ö ¾Öê
ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ ¯Ö¸ü ÛúÖê‡Ô ˆ¢Ö¸ü ®ÖÆüà ×»ÖÜÖëÝÖê …
• Please check that this question paper contains 16 printed pages.
• Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• Please write down the Serial Number of the question before attempting it.
• 15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the
question paper only and will not write any answer on the answer-book during this period.
ÛúÖê›ü ®ÖÓ. 
Code No. 
¯Ö¸üßõÖÖ£Öá ÛúÖê›ü ÛúÖê ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü 
¯Ö¸ü †¾Ö¿µÖ ×»ÖÜÖë … 
Candidates must write the Code on 
the title page of the answer-book.
SET – 1 
55/1/1/D 2 
(v) •ÖÆüÖÑ †Ö¾Ö¿µÖÛú ÆüÖê, ¾ÖÆüÖÑ †Ö¯Ö ³ÖÖîןÖÛ †“Ö¸üÖë Ûêú ×®Ö´®Ö×»Ö×ÜÖŸÖ ´Ö滵ÖÖë ÛúÖ ˆ¯ÖµÖÖêÝÖ Ûú¸ü ÃÖÛúŸÖê Æïü :
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
®µÖæ™ÒüÖò®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.675 × 10
–27
 kg 
¯ÖÏÖê™üÖê®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.673 × 10
–27
 kg 
‹ê¾ÖÖêÝÖê›ÒüÖê ÃÖÓܵÖÖ = 6.023 × 10
23
 ¯ÖÏ×ŸÖ ÝÖÏÖ´Ö ´ÖÖê»Ö 
²ÖÖò»™Ëü•ÖÌ´ÖÖ®Ö ×®ÖµÖŸÖÖÓÛú = 1.38 × 10
–23
 JK
–1
 
General Instructions : 
(i) There are 26 questions in all. All questions are compulsory.  
(ii) This question paper has five sections : Section A, Section B, Section C, Section D 
and Section E. 
(iii) Section A contains five questions of one mark each, Section B contains five 
questions of two marks each, Section C contains twelve questions of three marks 
each, Section D contains one value based question of four marks and Section E 
contains three questions of five marks each. 
(iv) There is no overall choice. However, an internal choice has been provided in one 
question of two marks, one question of three marks and all the three questions of 
five marks weightage. You have to attempt only one of the choices in such 
questions. 
(v) You may use the following values of physical constants wherever necessary : 
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
mass of neutron = 1.675 × 10
–27
 kg 
mass of proton = 1.673 × 10
–27
 kg 
Avogadro’s number = 6.023 × 10
23
 per gram mole 
Boltzmann constant = 1.38 × 10
–23
 JK
–1
 
55/1/1/D 3 [P.T.O. 
ÜÖÞ›ü – Ûú
Section – A 
1. ÃÖÓ¬ÖÖ׸ü¡Ö - ¯ÖÏן֑ÖÖŸÖ Ûúß ¯Ö׸ü³ÖÖÂÖÖ ×»Ö×ÜÖµÖê … ‡ÃÖÛúÖ ‹ÃÖ.†Ö‡Ô. (S.I.) ´ÖÖ¡ÖÛú ŒµÖÖ Æîü ? 1 
Define capacitor reactance. Write its S.I. units.
2. 1 cm ³Öã•ÖÖ Ûêú ‘Ö®Ö (ŒµÖæ²Ö) ´Öë ¯Ö׸ü²Ö¨ü (²Ö®¤ü) ×ÛúÃÖß ×«ü¬ÖÐã¾Ö Ûêú ÛúÖ¸üÞÖ ˆÃÖÃÖê ‘Ö®Ö ÃÖê ÝÖã•Ö¸ü®Öê ¾ÖÖ»Öê ×¾ÖªãŸÖ °»ÖŒÃÖ
ÛúÖ ´ÖÖ®Ö ŒµÖÖ ÆüÖêÝÖÖ ? 1
What is the electric flux through a cube of side 1 cm which encloses an electric dipole ?
3. ×ÛúÃÖß ˆ¢Ö»Ö »ÖëÃÖ Ûêú ¯Ö¤üÖ£ÖÔ ÛúÖ †¯Ö¾ÖŸÖÔ®ÖÖÓÛú 1.5 Æîü … ‡ÃÖê 1.65 †¯Ö¾ÖŸÖÔ®ÖÖÓÛú Ûêú ×ÛúÃÖß ´ÖÖ¬µÖ´Ö ´Öë ›ãü²ÖÖ®Öê ¯Ö¸ü »ÖëÃÖ
Ûúß ¯ÖÏÛéú×ŸÖ ÛîúÃÖß ÆüÖêÝÖß ? 1
A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65.
What is the nature of the lens ?
4. ¯ÖÖ¿¾ÖÔ ²Öï›ü ÛîúÃÖê ˆŸ¯Ö®®Ö ÆüÖêŸÖê Æïü ? 1
How are side bands produced ?
5. µÖÆüÖÑ ‹Ûú ¯Ö¤üÖ£ÖÔ, GaAs Ûêú ×»ÖµÖê, ¾ÖÖê»™üŸÖÖ Ûêú ÃÖÖ£Ö ¬ÖÖ¸üÖ Ûêú ¯Ö׸ü¾ÖŸÖÔ®Ö ÛúÖê ¤ü¿ÖÖÔ®Öê Ûêú ×»ÖµÖê ‹Ûú ÝÖÏÖ±ú (†Ö»ÖêÜÖ)
פüµÖÖ ÝÖµÖÖ Æîü, ˆÃÖ õÖê¡Ö Ûúß ¯ÖÆü“ÖÖ®Ö ÛúßוֵÖê •ÖÆüÖÑ,
(i) ŠúÞÖÖŸ´ÖÛú ¯ÖÏןָüÖê¬Ö Æîü …
(ii) †Öê´Ö Ûêú ×®ÖµÖ´Ö ÛúÖ ¯ÖÖ»Ö®Ö ÆüÖêŸÖÖ Æîü … 1 
Graph showing the variation of current versus voltage for a material GaAs is shown in 
the figure. Identify the region of  
(i) negative resistance 
(ii) where Ohm’s law is obeyed. 
Page 4


55/1/1/D 1 [P.T.O.
¸üÖê»Ö ®ÖÓ.
Roll No. 
³ÖÖîןÖÛú ×¾Ö–ÖÖ®Ö (ÃÖî¨üÖ×®ŸÖÛú) 
PHYSICS (Theory)  
×®Ö¬ÖÖÔ׸üŸÖ ÃÖ´ÖµÖ  : 3 ‘ÖÓ™êü ] [ †×¬ÖÛúŸÖ´Ö †ÓÛú  : 70
Time allowed : 3 hours ] [ Maximum Marks : 70 
ÃÖÖ´ÖÖ®µÖ ×®Ö¤ìü¿Ö    : : : :
(i) ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë Ûãú»Ö 26 ¯ÖÏ¿®Ö Æïü … ÃÖ³Öß ¯ÖÏ¿®Ö †×®Ö¾ÖÖµÖÔ Æïü …  
(ii) ‡ÃÖ ¯ÖÏ¿®Ö ¯Ö¡Ö Ûêú 5 ³ÖÖÝÖ Æïü : ÜÖÞ›ü-Ûú, ÜÖÞ›ü-ÜÖ, ÜÖÞ›ü-ÝÖ, ÜÖÞ›ü-‘Ö †Öî¸ü ÜÖÞ›ü-’û … 
(iii) ÜÖÞ›ü-Ûú ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 1 †ÓÛú ÛúÖ, ÜÖÞ›ü-ÜÖ ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 2 †ÓÛú Ûêú, ÜÖÞ›ü-ÝÖ ´Öë 12 ¯ÖÏ¿®Ö 
¯ÖÏŸµÖêÛú 3 †ÓÛú Ûêú, ÜÖÞ›ü-‘Ö ´Öë 4 †ÓÛú ÛúÖ ‹Ûú ´Ö滵ÖÖ¬ÖÖ׸üŸÖ ¯ÖÏ¿®Ö †Öî¸ü ÜÖÞ›ü-’û ´Öë 3 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 5 †ÓÛú 
Ûêú פü‹ ÝÖ‹ Æïü … 
(iv) ÃÖ´ÖÝÖÏ ¯Ö¸ü ÛúÖê‡Ô ×¾ÖÛú»¯Ö ®ÖÆüà Æîü … ×±ú¸ü ³Öß 2 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö, 3 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö †Öî¸ü 5 †ÓÛúÖë Ûêú 3 ¯ÖÏ¿®ÖÖë 
´Öë ³Öߟָüß ×¾ÖÛú»¯Ö פü‹ ÝÖ‹ Æïü … ‹êÃÖê ¯ÖÏ¿®ÖÖë ´Öë †Ö¯ÖÛúÖê ×¾ÖÛú»¯ÖÖë ´Öë ÃÖê ‹Ûú ÛúÖê Æü»Ö Ûú¸ü®ÖÖ Æîü … 
 Series : SSO/1 
55/1/1/D
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ´ÖãצüŸÖ ¯Öéšü 16 Æïü …
• ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ¤üÖ×Æü®Öê ÆüÖ£Ö Ûúß †Öê¸ü פü‹ ÝÖ‹ ÛúÖê›ü ®Ö´²Ö¸ü ÛúÖê ”ûÖ¡Ö ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü ¯Ö¸ü ×»ÖÜÖë …
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë 26 ¯ÖÏ¿®Ö Æïü …
• Ûéú¯ÖµÖÖ ¯ÖÏ¿®Ö ÛúÖ ˆ¢Ö¸ü ×»ÖÜÖ®ÖÖ ¿Öãºþ Ûú¸ü®Öê ÃÖê ¯ÖÆü»Öê, ¯ÖÏ¿®Ö ÛúÖ ÛÎú´ÖÖÓÛú †¾Ö¿µÖ ×»ÖÜÖë …
• ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌü®Öê Ûêú ×»Ö‹ 15 ×´Ö®Ö™ü ÛúÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÝÖµÖÖ Æîü … ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖ ×¾ÖŸÖ¸üÞÖ ¯Öæ¾ÖÖÔÆËü®Ö ´Öë 10.15 ²Ö•Öê
×ÛúµÖÖ •ÖÖµÖêÝÖÖ … 10.15 ²Ö•Öê ÃÖê 10.30 ²Ö•Öê ŸÖÛú ”ûÖ¡Ö Ûêú¾Ö»Ö ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌëüÝÖê †Öî¸ü ‡ÃÖ †¾Ö×¬Ö Ûêú ¤üÖî¸üÖ®Ö ¾Öê
ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ ¯Ö¸ü ÛúÖê‡Ô ˆ¢Ö¸ü ®ÖÆüà ×»ÖÜÖëÝÖê …
• Please check that this question paper contains 16 printed pages.
• Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• Please write down the Serial Number of the question before attempting it.
• 15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the
question paper only and will not write any answer on the answer-book during this period.
ÛúÖê›ü ®ÖÓ. 
Code No. 
¯Ö¸üßõÖÖ£Öá ÛúÖê›ü ÛúÖê ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü 
¯Ö¸ü †¾Ö¿µÖ ×»ÖÜÖë … 
Candidates must write the Code on 
the title page of the answer-book.
SET – 1 
55/1/1/D 2 
(v) •ÖÆüÖÑ †Ö¾Ö¿µÖÛú ÆüÖê, ¾ÖÆüÖÑ †Ö¯Ö ³ÖÖîןÖÛ †“Ö¸üÖë Ûêú ×®Ö´®Ö×»Ö×ÜÖŸÖ ´Ö滵ÖÖë ÛúÖ ˆ¯ÖµÖÖêÝÖ Ûú¸ü ÃÖÛúŸÖê Æïü :
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
®µÖæ™ÒüÖò®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.675 × 10
–27
 kg 
¯ÖÏÖê™üÖê®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.673 × 10
–27
 kg 
‹ê¾ÖÖêÝÖê›ÒüÖê ÃÖÓܵÖÖ = 6.023 × 10
23
 ¯ÖÏ×ŸÖ ÝÖÏÖ´Ö ´ÖÖê»Ö 
²ÖÖò»™Ëü•ÖÌ´ÖÖ®Ö ×®ÖµÖŸÖÖÓÛú = 1.38 × 10
–23
 JK
–1
 
General Instructions : 
(i) There are 26 questions in all. All questions are compulsory.  
(ii) This question paper has five sections : Section A, Section B, Section C, Section D 
and Section E. 
(iii) Section A contains five questions of one mark each, Section B contains five 
questions of two marks each, Section C contains twelve questions of three marks 
each, Section D contains one value based question of four marks and Section E 
contains three questions of five marks each. 
(iv) There is no overall choice. However, an internal choice has been provided in one 
question of two marks, one question of three marks and all the three questions of 
five marks weightage. You have to attempt only one of the choices in such 
questions. 
(v) You may use the following values of physical constants wherever necessary : 
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
mass of neutron = 1.675 × 10
–27
 kg 
mass of proton = 1.673 × 10
–27
 kg 
Avogadro’s number = 6.023 × 10
23
 per gram mole 
Boltzmann constant = 1.38 × 10
–23
 JK
–1
 
55/1/1/D 3 [P.T.O. 
ÜÖÞ›ü – Ûú
Section – A 
1. ÃÖÓ¬ÖÖ׸ü¡Ö - ¯ÖÏן֑ÖÖŸÖ Ûúß ¯Ö׸ü³ÖÖÂÖÖ ×»Ö×ÜÖµÖê … ‡ÃÖÛúÖ ‹ÃÖ.†Ö‡Ô. (S.I.) ´ÖÖ¡ÖÛú ŒµÖÖ Æîü ? 1 
Define capacitor reactance. Write its S.I. units.
2. 1 cm ³Öã•ÖÖ Ûêú ‘Ö®Ö (ŒµÖæ²Ö) ´Öë ¯Ö׸ü²Ö¨ü (²Ö®¤ü) ×ÛúÃÖß ×«ü¬ÖÐã¾Ö Ûêú ÛúÖ¸üÞÖ ˆÃÖÃÖê ‘Ö®Ö ÃÖê ÝÖã•Ö¸ü®Öê ¾ÖÖ»Öê ×¾ÖªãŸÖ °»ÖŒÃÖ
ÛúÖ ´ÖÖ®Ö ŒµÖÖ ÆüÖêÝÖÖ ? 1
What is the electric flux through a cube of side 1 cm which encloses an electric dipole ?
3. ×ÛúÃÖß ˆ¢Ö»Ö »ÖëÃÖ Ûêú ¯Ö¤üÖ£ÖÔ ÛúÖ †¯Ö¾ÖŸÖÔ®ÖÖÓÛú 1.5 Æîü … ‡ÃÖê 1.65 †¯Ö¾ÖŸÖÔ®ÖÖÓÛú Ûêú ×ÛúÃÖß ´ÖÖ¬µÖ´Ö ´Öë ›ãü²ÖÖ®Öê ¯Ö¸ü »ÖëÃÖ
Ûúß ¯ÖÏÛéú×ŸÖ ÛîúÃÖß ÆüÖêÝÖß ? 1
A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65.
What is the nature of the lens ?
4. ¯ÖÖ¿¾ÖÔ ²Öï›ü ÛîúÃÖê ˆŸ¯Ö®®Ö ÆüÖêŸÖê Æïü ? 1
How are side bands produced ?
5. µÖÆüÖÑ ‹Ûú ¯Ö¤üÖ£ÖÔ, GaAs Ûêú ×»ÖµÖê, ¾ÖÖê»™üŸÖÖ Ûêú ÃÖÖ£Ö ¬ÖÖ¸üÖ Ûêú ¯Ö׸ü¾ÖŸÖÔ®Ö ÛúÖê ¤ü¿ÖÖÔ®Öê Ûêú ×»ÖµÖê ‹Ûú ÝÖÏÖ±ú (†Ö»ÖêÜÖ)
פüµÖÖ ÝÖµÖÖ Æîü, ˆÃÖ õÖê¡Ö Ûúß ¯ÖÆü“ÖÖ®Ö ÛúßוֵÖê •ÖÆüÖÑ,
(i) ŠúÞÖÖŸ´ÖÛú ¯ÖÏןָüÖê¬Ö Æîü …
(ii) †Öê´Ö Ûêú ×®ÖµÖ´Ö ÛúÖ ¯ÖÖ»Ö®Ö ÆüÖêŸÖÖ Æîü … 1 
Graph showing the variation of current versus voltage for a material GaAs is shown in 
the figure. Identify the region of  
(i) negative resistance 
(ii) where Ohm’s law is obeyed. 
55/1/1/D 4 
ÜÖÞ›ü – ÜÖ
Section – B 
6. ‹Ûú ¯ÖÏÖê™üÖò®Ö ŸÖ£ÖÖ ‹Ûú ‹»±ÌúÖ (a) ÛúÞÖ ÃÖê ÃÖÓ²Ö¨ü ›üß-²ÖÎÖòÝ»Öß ŸÖ¸ÓüÝÖ¤îü¬µÖÖí ÛúÖ ´ÖÖ®Ö ÃÖ´ÖÖ®Ö Æîü, ŸÖÖê –ÖÖŸÖ ÛúßוֵÖê –
(i)  ˆ®ÖÛêú Ÿ¾Ö¸üÛú ×¾Ö³Ö¾ÖÖë ÛúÖ †®Öã¯ÖÖŸÖ
(ii)  ˆ®ÖÛúß “ÖÖ»ÖÖë ÛúÖ †®Öã¯ÖÖŸÖ 2 
A proton and an a-particle have the same de-Broglie wavelength. Determine the ratio
of (i) their accelerating potentials (ii) their speeds.
7. ¤ü¿ÖÖÔ‡µÖê ×Ûú ÆüÖ‡›ÒüÖê•Ö®Ö ¯Ö¸ü´ÖÖÞÖã Ûúß ÛúõÖÖë Ûúß ×¡Ö•µÖÖ ´Öë n
2
 Ûêú †®ÖãÃÖÖ¸ü ¯Ö׸ü¾ÖŸÖÔ®Ö ÆüÖêŸÖÖ Æïü … •ÖÆüÖÑ, n ¯Ö¸ü´ÖÖÞÖã Ûúß
Œ¾ÖÖÓ™ü´Ö ÃÖÓܵÖÖ Æîü … 2
Show that the radius of the orbit in hydrogen atom varies as n
2
, where n is the
principal quantum number of the atom.
8. ®Öî•Ö ŸÖ£ÖÖ †¯Ö×´Ö×ÁÖŸÖ †¬ÖÔ“ÖÖ»ÖÛúÖë ´Öë †®ŸÖ¸ü (³Öê¤ü) ÛúßוֵÖê … 2
Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.
9. ¤ü¯ÖÔÞÖ ÃÖæ¡Ö Ûêú ˆ¯ÖµÖÖêÝÖ «üÖ¸üÖ ¤ü¿ÖÖÔ‡µÖê ×Ûú, ×ÛúÃÖß †¾ÖŸÖ»Ö ¤ü¯ÖÔÞÖ Ûêú ÃÖÖ´Ö®Öê ˆÃÖÛúß f (±úÖêÛúÃÖ ¤æü¸üß) ŸÖ£ÖÖ 2f (¾ÖÛÎúŸÖÖ
ס֕µÖÖ) Ûêú ²Öß“Ö ×Ã£ÖŸÖ ×ÛúÃÖß ¾ÖßÖã ÛúÖ ¯ÖÏןÖײִ²Ö, 2f Ûêú ¯Ö¸êü (2f ÃÖê †Öî¸ü †ÖÝÖê) ²Ö®ÖŸÖÖ Æîü … 2
Use the mirror equation to show that an object placed between f and 2f of a concave
mirror produces a real image beyond 2f.
†£Ö¾ÖÖ/OR
¤üÖê ÛÎúÖ×ÃÖŸÖ ¯ÖÖê»Öê¸üÖò‡›üÖë Ûêú ²Öß“Ö ´Öë ×ÛúÃÖß †®µÖ ¯ÖÖê»ÖÖò¸üÖ‡›ü Ûúß ¿Öß™ü (“ÖÖ¤ü¸ü) ÛúÖê ‘Öã´ÖÖ®Öê ÃÖê ¯ÖÖ¸üÝÖ×´ÖŸÖ ¯ÖÏÛúÖ¿Ö Ûúß 
ŸÖß¾ÖΟÖÖ Ûêú ×»ÖµÖê ¾µÖÓ•ÖÛú ¯ÖÏÖ¯ŸÖ ÛúßוֵÖê …  
‡ÃÖ ¿Öß™ü (“ÖÖ¤ü¸ü) Ûúß ×ÛúÃÖ ×ãÖ×ŸÖ ´Öë ¯ÖÖ¸üÝÖ×´ÖŸÖ ¯ÖÏÛúÖ¿Ö Ûúß ŸÖß¾ÖΟÖÖ †×¬ÖÛúŸÖ´Ö ÆüÖêÝÖß ? 
Find an expression for intensity of transmitted light when a polaroid sheet is rotated 
between two crossed polaroids. In which position of the polaroid sheet will the 
transmitted intensity be maximum ? 
10. ×Ûú¸üÜÖÖê¯Ö Ûêú ×®ÖµÖ´ÖÖë Ûêú ˆ¯ÖµÖÖêÝÖ ÃÖê ×ÛúÃÖß ¾Æüß™üÙüÖê®Ö ײÖ륅 (ÃÖêŸÖã) ´Öë ÃÖÓŸÖã»Ö®Ö ×ãÖ×ŸÖ Ûêú ×»ÖµÖê ¯ÖÏןֲ֮¬Ö (¿ÖŸÖí) –ÖÖŸÖ
ÛúßוֵÖê … 2
Use Kirchhoff’s rules to obtain conditions for the balance condition in a Wheatstone
bridge.
Page 5


55/1/1/D 1 [P.T.O.
¸üÖê»Ö ®ÖÓ.
Roll No. 
³ÖÖîןÖÛú ×¾Ö–ÖÖ®Ö (ÃÖî¨üÖ×®ŸÖÛú) 
PHYSICS (Theory)  
×®Ö¬ÖÖÔ׸üŸÖ ÃÖ´ÖµÖ  : 3 ‘ÖÓ™êü ] [ †×¬ÖÛúŸÖ´Ö †ÓÛú  : 70
Time allowed : 3 hours ] [ Maximum Marks : 70 
ÃÖÖ´ÖÖ®µÖ ×®Ö¤ìü¿Ö    : : : :
(i) ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë Ûãú»Ö 26 ¯ÖÏ¿®Ö Æïü … ÃÖ³Öß ¯ÖÏ¿®Ö †×®Ö¾ÖÖµÖÔ Æïü …  
(ii) ‡ÃÖ ¯ÖÏ¿®Ö ¯Ö¡Ö Ûêú 5 ³ÖÖÝÖ Æïü : ÜÖÞ›ü-Ûú, ÜÖÞ›ü-ÜÖ, ÜÖÞ›ü-ÝÖ, ÜÖÞ›ü-‘Ö †Öî¸ü ÜÖÞ›ü-’û … 
(iii) ÜÖÞ›ü-Ûú ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 1 †ÓÛú ÛúÖ, ÜÖÞ›ü-ÜÖ ´Öë 5 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 2 †ÓÛú Ûêú, ÜÖÞ›ü-ÝÖ ´Öë 12 ¯ÖÏ¿®Ö 
¯ÖÏŸµÖêÛú 3 †ÓÛú Ûêú, ÜÖÞ›ü-‘Ö ´Öë 4 †ÓÛú ÛúÖ ‹Ûú ´Ö滵ÖÖ¬ÖÖ׸üŸÖ ¯ÖÏ¿®Ö †Öî¸ü ÜÖÞ›ü-’û ´Öë 3 ¯ÖÏ¿®Ö ¯ÖÏŸµÖêÛú 5 †ÓÛú 
Ûêú פü‹ ÝÖ‹ Æïü … 
(iv) ÃÖ´ÖÝÖÏ ¯Ö¸ü ÛúÖê‡Ô ×¾ÖÛú»¯Ö ®ÖÆüà Æîü … ×±ú¸ü ³Öß 2 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö, 3 †ÓÛú Ûêú 1 ¯ÖÏ¿®Ö †Öî¸ü 5 †ÓÛúÖë Ûêú 3 ¯ÖÏ¿®ÖÖë 
´Öë ³Öߟָüß ×¾ÖÛú»¯Ö פü‹ ÝÖ‹ Æïü … ‹êÃÖê ¯ÖÏ¿®ÖÖë ´Öë †Ö¯ÖÛúÖê ×¾ÖÛú»¯ÖÖë ´Öë ÃÖê ‹Ûú ÛúÖê Æü»Ö Ûú¸ü®ÖÖ Æîü … 
 Series : SSO/1 
55/1/1/D
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ´ÖãצüŸÖ ¯Öéšü 16 Æïü …
• ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë ¤üÖ×Æü®Öê ÆüÖ£Ö Ûúß †Öê¸ü פü‹ ÝÖ‹ ÛúÖê›ü ®Ö´²Ö¸ü ÛúÖê ”ûÖ¡Ö ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü ¯Ö¸ü ×»ÖÜÖë …
• Ûéú¯ÖµÖÖ •ÖÖÑ“Ö Ûú¸ü »Öë ×Ûú ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ´Öë 26 ¯ÖÏ¿®Ö Æïü …
• Ûéú¯ÖµÖÖ ¯ÖÏ¿®Ö ÛúÖ ˆ¢Ö¸ü ×»ÖÜÖ®ÖÖ ¿Öãºþ Ûú¸ü®Öê ÃÖê ¯ÖÆü»Öê, ¯ÖÏ¿®Ö ÛúÖ ÛÎú´ÖÖÓÛú †¾Ö¿µÖ ×»ÖÜÖë …
• ‡ÃÖ ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌü®Öê Ûêú ×»Ö‹ 15 ×´Ö®Ö™ü ÛúÖ ÃÖ´ÖµÖ ×¤üµÖÖ ÝÖµÖÖ Æîü … ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖ ×¾ÖŸÖ¸üÞÖ ¯Öæ¾ÖÖÔÆËü®Ö ´Öë 10.15 ²Ö•Öê
×ÛúµÖÖ •ÖÖµÖêÝÖÖ … 10.15 ²Ö•Öê ÃÖê 10.30 ²Ö•Öê ŸÖÛú ”ûÖ¡Ö Ûêú¾Ö»Ö ¯ÖÏ¿®Ö-¯Ö¡Ö ÛúÖê ¯ÖœÌëüÝÖê †Öî¸ü ‡ÃÖ †¾Ö×¬Ö Ûêú ¤üÖî¸üÖ®Ö ¾Öê
ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ ¯Ö¸ü ÛúÖê‡Ô ˆ¢Ö¸ü ®ÖÆüà ×»ÖÜÖëÝÖê …
• Please check that this question paper contains 16 printed pages.
• Code number given on the right hand side of the question paper should be written on the
title page of the answer-book by the candidate.
• Please check that this question paper contains 26 questions.
• Please write down the Serial Number of the question before attempting it.
• 15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the
question paper only and will not write any answer on the answer-book during this period.
ÛúÖê›ü ®ÖÓ. 
Code No. 
¯Ö¸üßõÖÖ£Öá ÛúÖê›ü ÛúÖê ˆ¢Ö¸ü-¯Öã×ßÖÛúÖ Ûêú ´ÖãÜÖ-¯Öéšü 
¯Ö¸ü †¾Ö¿µÖ ×»ÖÜÖë … 
Candidates must write the Code on 
the title page of the answer-book.
SET – 1 
55/1/1/D 2 
(v) •ÖÆüÖÑ †Ö¾Ö¿µÖÛú ÆüÖê, ¾ÖÆüÖÑ †Ö¯Ö ³ÖÖîןÖÛ †“Ö¸üÖë Ûêú ×®Ö´®Ö×»Ö×ÜÖŸÖ ´Ö滵ÖÖë ÛúÖ ˆ¯ÖµÖÖêÝÖ Ûú¸ü ÃÖÛúŸÖê Æïü :
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
®µÖæ™ÒüÖò®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.675 × 10
–27
 kg 
¯ÖÏÖê™üÖê®Ö ÛúÖ ¦ü¾µÖ´ÖÖ®Ö = 1.673 × 10
–27
 kg 
‹ê¾ÖÖêÝÖê›ÒüÖê ÃÖÓܵÖÖ = 6.023 × 10
23
 ¯ÖÏ×ŸÖ ÝÖÏÖ´Ö ´ÖÖê»Ö 
²ÖÖò»™Ëü•ÖÌ´ÖÖ®Ö ×®ÖµÖŸÖÖÓÛú = 1.38 × 10
–23
 JK
–1
 
General Instructions : 
(i) There are 26 questions in all. All questions are compulsory.  
(ii) This question paper has five sections : Section A, Section B, Section C, Section D 
and Section E. 
(iii) Section A contains five questions of one mark each, Section B contains five 
questions of two marks each, Section C contains twelve questions of three marks 
each, Section D contains one value based question of four marks and Section E 
contains three questions of five marks each. 
(iv) There is no overall choice. However, an internal choice has been provided in one 
question of two marks, one question of three marks and all the three questions of 
five marks weightage. You have to attempt only one of the choices in such 
questions. 
(v) You may use the following values of physical constants wherever necessary : 
c = 3 × 10
8
 m/s 
h = 6.63 × 10
–34
 Js 
e = 1.6 × 10
–19
 C 
µ
0
 = 4p × 10
–7
 T m A
–1
e
0
 = 8.854 × 10
–12
 C
2
 N
–1
 m
–2
1
4pe
0
 = 9 × 10
9
 N m
2
 C
–2
m
e
 = 9.1 × 10
–31
 kg
mass of neutron = 1.675 × 10
–27
 kg 
mass of proton = 1.673 × 10
–27
 kg 
Avogadro’s number = 6.023 × 10
23
 per gram mole 
Boltzmann constant = 1.38 × 10
–23
 JK
–1
 
55/1/1/D 3 [P.T.O. 
ÜÖÞ›ü – Ûú
Section – A 
1. ÃÖÓ¬ÖÖ׸ü¡Ö - ¯ÖÏן֑ÖÖŸÖ Ûúß ¯Ö׸ü³ÖÖÂÖÖ ×»Ö×ÜÖµÖê … ‡ÃÖÛúÖ ‹ÃÖ.†Ö‡Ô. (S.I.) ´ÖÖ¡ÖÛú ŒµÖÖ Æîü ? 1 
Define capacitor reactance. Write its S.I. units.
2. 1 cm ³Öã•ÖÖ Ûêú ‘Ö®Ö (ŒµÖæ²Ö) ´Öë ¯Ö׸ü²Ö¨ü (²Ö®¤ü) ×ÛúÃÖß ×«ü¬ÖÐã¾Ö Ûêú ÛúÖ¸üÞÖ ˆÃÖÃÖê ‘Ö®Ö ÃÖê ÝÖã•Ö¸ü®Öê ¾ÖÖ»Öê ×¾ÖªãŸÖ °»ÖŒÃÖ
ÛúÖ ´ÖÖ®Ö ŒµÖÖ ÆüÖêÝÖÖ ? 1
What is the electric flux through a cube of side 1 cm which encloses an electric dipole ?
3. ×ÛúÃÖß ˆ¢Ö»Ö »ÖëÃÖ Ûêú ¯Ö¤üÖ£ÖÔ ÛúÖ †¯Ö¾ÖŸÖÔ®ÖÖÓÛú 1.5 Æîü … ‡ÃÖê 1.65 †¯Ö¾ÖŸÖÔ®ÖÖÓÛú Ûêú ×ÛúÃÖß ´ÖÖ¬µÖ´Ö ´Öë ›ãü²ÖÖ®Öê ¯Ö¸ü »ÖëÃÖ
Ûúß ¯ÖÏÛéú×ŸÖ ÛîúÃÖß ÆüÖêÝÖß ? 1
A concave lens of refractive index 1.5 is immersed in a medium of refractive index 1.65.
What is the nature of the lens ?
4. ¯ÖÖ¿¾ÖÔ ²Öï›ü ÛîúÃÖê ˆŸ¯Ö®®Ö ÆüÖêŸÖê Æïü ? 1
How are side bands produced ?
5. µÖÆüÖÑ ‹Ûú ¯Ö¤üÖ£ÖÔ, GaAs Ûêú ×»ÖµÖê, ¾ÖÖê»™üŸÖÖ Ûêú ÃÖÖ£Ö ¬ÖÖ¸üÖ Ûêú ¯Ö׸ü¾ÖŸÖÔ®Ö ÛúÖê ¤ü¿ÖÖÔ®Öê Ûêú ×»ÖµÖê ‹Ûú ÝÖÏÖ±ú (†Ö»ÖêÜÖ)
פüµÖÖ ÝÖµÖÖ Æîü, ˆÃÖ õÖê¡Ö Ûúß ¯ÖÆü“ÖÖ®Ö ÛúßוֵÖê •ÖÆüÖÑ,
(i) ŠúÞÖÖŸ´ÖÛú ¯ÖÏןָüÖê¬Ö Æîü …
(ii) †Öê´Ö Ûêú ×®ÖµÖ´Ö ÛúÖ ¯ÖÖ»Ö®Ö ÆüÖêŸÖÖ Æîü … 1 
Graph showing the variation of current versus voltage for a material GaAs is shown in 
the figure. Identify the region of  
(i) negative resistance 
(ii) where Ohm’s law is obeyed. 
55/1/1/D 4 
ÜÖÞ›ü – ÜÖ
Section – B 
6. ‹Ûú ¯ÖÏÖê™üÖò®Ö ŸÖ£ÖÖ ‹Ûú ‹»±ÌúÖ (a) ÛúÞÖ ÃÖê ÃÖÓ²Ö¨ü ›üß-²ÖÎÖòÝ»Öß ŸÖ¸ÓüÝÖ¤îü¬µÖÖí ÛúÖ ´ÖÖ®Ö ÃÖ´ÖÖ®Ö Æîü, ŸÖÖê –ÖÖŸÖ ÛúßוֵÖê –
(i)  ˆ®ÖÛêú Ÿ¾Ö¸üÛú ×¾Ö³Ö¾ÖÖë ÛúÖ †®Öã¯ÖÖŸÖ
(ii)  ˆ®ÖÛúß “ÖÖ»ÖÖë ÛúÖ †®Öã¯ÖÖŸÖ 2 
A proton and an a-particle have the same de-Broglie wavelength. Determine the ratio
of (i) their accelerating potentials (ii) their speeds.
7. ¤ü¿ÖÖÔ‡µÖê ×Ûú ÆüÖ‡›ÒüÖê•Ö®Ö ¯Ö¸ü´ÖÖÞÖã Ûúß ÛúõÖÖë Ûúß ×¡Ö•µÖÖ ´Öë n
2
 Ûêú †®ÖãÃÖÖ¸ü ¯Ö׸ü¾ÖŸÖÔ®Ö ÆüÖêŸÖÖ Æïü … •ÖÆüÖÑ, n ¯Ö¸ü´ÖÖÞÖã Ûúß
Œ¾ÖÖÓ™ü´Ö ÃÖÓܵÖÖ Æîü … 2
Show that the radius of the orbit in hydrogen atom varies as n
2
, where n is the
principal quantum number of the atom.
8. ®Öî•Ö ŸÖ£ÖÖ †¯Ö×´Ö×ÁÖŸÖ †¬ÖÔ“ÖÖ»ÖÛúÖë ´Öë †®ŸÖ¸ü (³Öê¤ü) ÛúßוֵÖê … 2
Distinguish between ‘intrinsic’ and ‘extrinsic’ semiconductors.
9. ¤ü¯ÖÔÞÖ ÃÖæ¡Ö Ûêú ˆ¯ÖµÖÖêÝÖ «üÖ¸üÖ ¤ü¿ÖÖÔ‡µÖê ×Ûú, ×ÛúÃÖß †¾ÖŸÖ»Ö ¤ü¯ÖÔÞÖ Ûêú ÃÖÖ´Ö®Öê ˆÃÖÛúß f (±úÖêÛúÃÖ ¤æü¸üß) ŸÖ£ÖÖ 2f (¾ÖÛÎúŸÖÖ
ס֕µÖÖ) Ûêú ²Öß“Ö ×Ã£ÖŸÖ ×ÛúÃÖß ¾ÖßÖã ÛúÖ ¯ÖÏןÖײִ²Ö, 2f Ûêú ¯Ö¸êü (2f ÃÖê †Öî¸ü †ÖÝÖê) ²Ö®ÖŸÖÖ Æîü … 2
Use the mirror equation to show that an object placed between f and 2f of a concave
mirror produces a real image beyond 2f.
†£Ö¾ÖÖ/OR
¤üÖê ÛÎúÖ×ÃÖŸÖ ¯ÖÖê»Öê¸üÖò‡›üÖë Ûêú ²Öß“Ö ´Öë ×ÛúÃÖß †®µÖ ¯ÖÖê»ÖÖò¸üÖ‡›ü Ûúß ¿Öß™ü (“ÖÖ¤ü¸ü) ÛúÖê ‘Öã´ÖÖ®Öê ÃÖê ¯ÖÖ¸üÝÖ×´ÖŸÖ ¯ÖÏÛúÖ¿Ö Ûúß 
ŸÖß¾ÖΟÖÖ Ûêú ×»ÖµÖê ¾µÖÓ•ÖÛú ¯ÖÏÖ¯ŸÖ ÛúßוֵÖê …  
‡ÃÖ ¿Öß™ü (“ÖÖ¤ü¸ü) Ûúß ×ÛúÃÖ ×ãÖ×ŸÖ ´Öë ¯ÖÖ¸üÝÖ×´ÖŸÖ ¯ÖÏÛúÖ¿Ö Ûúß ŸÖß¾ÖΟÖÖ †×¬ÖÛúŸÖ´Ö ÆüÖêÝÖß ? 
Find an expression for intensity of transmitted light when a polaroid sheet is rotated 
between two crossed polaroids. In which position of the polaroid sheet will the 
transmitted intensity be maximum ? 
10. ×Ûú¸üÜÖÖê¯Ö Ûêú ×®ÖµÖ´ÖÖë Ûêú ˆ¯ÖµÖÖêÝÖ ÃÖê ×ÛúÃÖß ¾Æüß™üÙüÖê®Ö ײÖ륅 (ÃÖêŸÖã) ´Öë ÃÖÓŸÖã»Ö®Ö ×ãÖ×ŸÖ Ûêú ×»ÖµÖê ¯ÖÏןֲ֮¬Ö (¿ÖŸÖí) –ÖÖŸÖ
ÛúßוֵÖê … 2
Use Kirchhoff’s rules to obtain conditions for the balance condition in a Wheatstone
bridge.
55/1/1/D 5 [P.T.O. 
ÜÖÞ›ü – ÝÖ
Section – C 
11. ×¾ÖªãŸÖ “Öã´²ÖÛúßµÖ Ã¯ÖꌙÒü´Ö Ûêú ˆÃÖ ³ÖÖÝÖ ÛúÖ ®ÖÖ´Ö ×»Ö×ÜÖµÖê
(a) •ÖÖê ×¾Ö´ÖÖ®Ö ÃÖÓ“ÖÖ»Ö®Ö ´Öë ¯ÖϵÖãŒŸÖ ¸ü›üÖ¸ü ¾µÖ¾ÖãÖÖ Ûêú ×»ÖµÖê ˆ¯ÖµÖãŒŸÖ ÆüÖêŸÖÖ Æîü …
(b) וÖÃÖÛúÖ ˆ¯ÖµÖÖêÝÖ ¯Öê¿ÖßµÖ ×¾ÖÛéú×ŸÖ (ŸÖ®ÖÖ¾Ö) Ûêú ˆ¯Ö“ÖÖ¸ü ´Öë ÆüÖêŸÖÖ Æîü …
(c) •ÖÖê דÖ×ÛúŸÃÖÖ ´Öë ¸üÖêÝÖ-×®Ö¤üÖ®Ö Ûêú ×»ÖµÖê ¯ÖϵÖãŒŸÖ ÆüÖêŸÖÖ Æîü …
ÃÖÓõÖê¯Ö ´Öë ×»Ö×ÜÖµÖê ×Ûú ‡®Ö ŸÖ¸ÓüÝÖÖë ÛúÖê ÛîúÃÖê ˆŸ¯Ö®®Ö ×ÛúµÖÖ •ÖÖ ÃÖÛúŸÖÖ Æîü … 3
Name the parts of the electromagnetic spectrum which is
(a) suitable for radar systems used in aircraft navigation.
(b) used to treat muscular strain.
(c) used as a diagnostic tool in medicine.
Write in brief, how these waves can be produced.
12. (i) ×ÛúÃÖß ×¾Ö¿ÖÖ»Ö (²ÖéÆüŸÖË) †¯Ö¾ÖŸÖá ¤æü¸ü¤ü¿ÖÔÛú Ûêú †×³Ö¥ü¿µÖÛú »ÖëÃÖ Ûúß ±úÖêÛúÃÖ ¤æü¸üß 15 m Æîü … µÖפü 1.0 cm
±úÖêÛúÃÖ ¤æü¸üß Ûúß ®ÖêסÖÛúÖ ÛúÖ ˆ¯ÖµÖÖêÝÖ ×ÛúµÖÖ •ÖÖµÖ ŸÖÖê ¤æü¸ü¤ü¿ÖÔÛú ÛúÖ ÛúÖêÞÖßµÖ †Ö¾Ö¬ÖÔ®Ö ×ÛúŸÖ®ÖÖ ÆüÖêÝÖÖ ? 
(ii) µÖפü ‡ÃÖ ¤æü¸ü¤ü¿ÖÔÛú ÛúÖ ˆ¯ÖµÖÖêÝÖ “Ö®¦ü´ÖÖ ÛúÖê ¤êüÜÖ®Öê Ûêú ×»ÖµÖê ×ÛúµÖÖ •ÖÖµÖ ŸÖÖê, †×³Ö¥ü¿µÖÛú »ÖëÃÖ «üÖ¸üÖ ²Ö®ÖÖµÖê 
ÝÖµÖê “Ö®¦ü´ÖÖ Ûêú ¯ÖÏןÖײִ²Ö ÛúÖ ¾µÖÖÃÖ ×ÛúŸÖ®ÖÖ ÆüÖêÝÖÖ ? “Ö®¦ü´ÖÖ ÛúÖ ¾µÖÖÃÖ 3.48 × 10
6
 m ŸÖ£ÖÖ ‡ÃÖÛúß ÛúõÖÖ 
Ûúß ×¡Ö•µÖÖ 3.8 × 10
8
 m Æîü …  3
(i) A giant refracting telescope has an objective lens of focal length 15 m. If an eye 
piece of focal length 1.0 cm is used, what is the angular magnification of the 
telescope ? 
(ii) If this telescope is used to view the moon, what is the diameter of the image of 
the moon formed by the objective lens ? The diameter of the moon is 3.48 × 10
6
 m 
and the radius of lunar orbit is 3.8 × 10
8
 m. 
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