CBSE Physics Past year paper - 2017, Class 12 Class 12 Notes | EduRev

Physics Class 12

Class 12 : CBSE Physics Past year paper - 2017, Class 12 Class 12 Notes | EduRev

 Page 1


  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
CBSE 
Class XII Physics - Set I 
Board Paper - All India – 2017 
Time: 3 hours                                                                Maximum Marks: 70 
  
General Instructions:                                                                                                                     
(i) All questions are compulsory. There are 26 questions in all. 
(ii) This question paper has five sections: Section A, Section B, Section, 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
 = 4 p ? 10
-7 
T mA
-l
 
?
0
 = 8.854 ? 10
-12
 C
2
 N
-1
 m
-2
 
0
1
4 ??
 = 9 ? 10
9
 N m
2  
C
-2
 
Mass of electron
 
= 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
 J K
-1
 
 
  
Page 2


  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
CBSE 
Class XII Physics - Set I 
Board Paper - All India – 2017 
Time: 3 hours                                                                Maximum Marks: 70 
  
General Instructions:                                                                                                                     
(i) All questions are compulsory. There are 26 questions in all. 
(ii) This question paper has five sections: Section A, Section B, Section, 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
 = 4 p ? 10
-7 
T mA
-l
 
?
0
 = 8.854 ? 10
-12
 C
2
 N
-1
 m
-2
 
0
1
4 ??
 = 9 ? 10
9
 N m
2  
C
-2
 
Mass of electron
 
= 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
 J K
-1
 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
SECTION – A 
Q. 1 Nichrome and Copper wires of same length and same radius are connected in 
series. Current I is passed through them. Which wire gets heated up more? Justify 
your answer. [1] 
 
Q. 2 Do electromagnetic waves carry energy and momentum?  [1] 
 
Q. 3 How does the angle of minimum deviation of a glass prism vary, if the incident 
violet light is replaced by red light? Give reason. [1] 
 
Q. 4 Name the phenomenon which shows the quantum nature of electromagnetic 
radiation. [1] 
 
Q. 5 Predict the polarity of the capacitor in the situation described below: [1] 
 
 
SECTION – B 
Q. 6 Draw the intensity pattern for single slit diffraction and double slit 
interference. Hence, State two differences between interference and diffraction 
patterns.               [2] 
OR 
 
Unpolarised light is passed through a Polaroid P
1
. When this polarised beam passes 
through another polaroid P
2
, and if the pass axis of P
2
 makes angle ? with the pass 
axis of P
1
, then write the expression for the polarised beam passing through P
2
. 
Draw a plot showing the variation of intensity when ? varies from 0 to 2 ?.  [2] 
  
Page 3


  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
CBSE 
Class XII Physics - Set I 
Board Paper - All India – 2017 
Time: 3 hours                                                                Maximum Marks: 70 
  
General Instructions:                                                                                                                     
(i) All questions are compulsory. There are 26 questions in all. 
(ii) This question paper has five sections: Section A, Section B, Section, 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
 = 4 p ? 10
-7 
T mA
-l
 
?
0
 = 8.854 ? 10
-12
 C
2
 N
-1
 m
-2
 
0
1
4 ??
 = 9 ? 10
9
 N m
2  
C
-2
 
Mass of electron
 
= 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
 J K
-1
 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
SECTION – A 
Q. 1 Nichrome and Copper wires of same length and same radius are connected in 
series. Current I is passed through them. Which wire gets heated up more? Justify 
your answer. [1] 
 
Q. 2 Do electromagnetic waves carry energy and momentum?  [1] 
 
Q. 3 How does the angle of minimum deviation of a glass prism vary, if the incident 
violet light is replaced by red light? Give reason. [1] 
 
Q. 4 Name the phenomenon which shows the quantum nature of electromagnetic 
radiation. [1] 
 
Q. 5 Predict the polarity of the capacitor in the situation described below: [1] 
 
 
SECTION – B 
Q. 6 Draw the intensity pattern for single slit diffraction and double slit 
interference. Hence, State two differences between interference and diffraction 
patterns.               [2] 
OR 
 
Unpolarised light is passed through a Polaroid P
1
. When this polarised beam passes 
through another polaroid P
2
, and if the pass axis of P
2
 makes angle ? with the pass 
axis of P
1
, then write the expression for the polarised beam passing through P
2
. 
Draw a plot showing the variation of intensity when ? varies from 0 to 2 ?.  [2] 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 7 Identify the electromagnetic waves whose wavelength vary as [2] 
(a) 10
-12
 m < ? < 10
-8
 m 
(b) 10
-3
 m < ? < 10
-1
 m 
Write one use for each. 
 
Q. 8 Find the condition under which the charged particles moving with different 
speeds in the presence of electric and magnetic field vectors can be used to select 
charged particles of a particular speed. [2] 
 
Q. 9 A 12.5 eV electron beam is used to excite a gaseous hydrogen atom at room 
temperature. Determine the wavelengths and the corresponding series of the lines 
emitted. [2] 
 
Q. 10 Write two properties of a material for making (a) a permanent magnet, and 
(b) an electromagnet. [2] 
 
SECTION – C 
Q. 11                [3] 
(a) The potential difference applied across a given resistor is altered so that 
the heat produced per second increases by a factor of 9. By what factor 
does the applied potential difference change? 
(b) In the figure shown, an ammeter A and a resistor of 4 ? are connected to 
the terminals of the source. The emf of the source is 12 V having an 
internal resistance of 2 ?. Calculate the voltmeter and ammeter readings. 
 
  
Page 4


  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
CBSE 
Class XII Physics - Set I 
Board Paper - All India – 2017 
Time: 3 hours                                                                Maximum Marks: 70 
  
General Instructions:                                                                                                                     
(i) All questions are compulsory. There are 26 questions in all. 
(ii) This question paper has five sections: Section A, Section B, Section, 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
 = 4 p ? 10
-7 
T mA
-l
 
?
0
 = 8.854 ? 10
-12
 C
2
 N
-1
 m
-2
 
0
1
4 ??
 = 9 ? 10
9
 N m
2  
C
-2
 
Mass of electron
 
= 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
 J K
-1
 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
SECTION – A 
Q. 1 Nichrome and Copper wires of same length and same radius are connected in 
series. Current I is passed through them. Which wire gets heated up more? Justify 
your answer. [1] 
 
Q. 2 Do electromagnetic waves carry energy and momentum?  [1] 
 
Q. 3 How does the angle of minimum deviation of a glass prism vary, if the incident 
violet light is replaced by red light? Give reason. [1] 
 
Q. 4 Name the phenomenon which shows the quantum nature of electromagnetic 
radiation. [1] 
 
Q. 5 Predict the polarity of the capacitor in the situation described below: [1] 
 
 
SECTION – B 
Q. 6 Draw the intensity pattern for single slit diffraction and double slit 
interference. Hence, State two differences between interference and diffraction 
patterns.               [2] 
OR 
 
Unpolarised light is passed through a Polaroid P
1
. When this polarised beam passes 
through another polaroid P
2
, and if the pass axis of P
2
 makes angle ? with the pass 
axis of P
1
, then write the expression for the polarised beam passing through P
2
. 
Draw a plot showing the variation of intensity when ? varies from 0 to 2 ?.  [2] 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 7 Identify the electromagnetic waves whose wavelength vary as [2] 
(a) 10
-12
 m < ? < 10
-8
 m 
(b) 10
-3
 m < ? < 10
-1
 m 
Write one use for each. 
 
Q. 8 Find the condition under which the charged particles moving with different 
speeds in the presence of electric and magnetic field vectors can be used to select 
charged particles of a particular speed. [2] 
 
Q. 9 A 12.5 eV electron beam is used to excite a gaseous hydrogen atom at room 
temperature. Determine the wavelengths and the corresponding series of the lines 
emitted. [2] 
 
Q. 10 Write two properties of a material for making (a) a permanent magnet, and 
(b) an electromagnet. [2] 
 
SECTION – C 
Q. 11                [3] 
(a) The potential difference applied across a given resistor is altered so that 
the heat produced per second increases by a factor of 9. By what factor 
does the applied potential difference change? 
(b) In the figure shown, an ammeter A and a resistor of 4 ? are connected to 
the terminals of the source. The emf of the source is 12 V having an 
internal resistance of 2 ?. Calculate the voltmeter and ammeter readings. 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 12  [3] 
(a) How is amplitude modulation achieved? 
(b) The frequencies of two side bands in an AM wave are 640 kHz and 660 kHz, 
respectively. Find the frequencies of carrier and modulating signal. What is the 
bandwidth required for amplitude modulation? 
 
Q. 13  [3] 
(a) In the following diagram, is the junction diode forward biased or reverse 
biased? 
 
(b) Draw the circuit diagram of a full wave rectifier and state how it works. 
 
Q. 14 Using photon picture of light, show how Einstein’s photoelectric equation can 
be established. Write two features of photoelectric effect which cannot be explained 
by wave theory.  [3] 
 
Q. 15                [3] 
a) Monochromatic light of wavelength 589 nm is incident from air on a water 
surface. If µ for water is 1.33, find the wavelength, frequency and speed of 
the refracted light. 
b) A double convex lens is made of a glass of refractive index 1.55, with both 
faces of the same radius of curvature. Find the radius of curvature required, 
if the focal length is 20cm. 
 
Q. 16 Define mutual inductance between a pair of coils. Derive an expression for 
the mutual inductance of two long coaxial solenoids of same length wound one over 
the other. [3] 
OR 
Define self-inductance of a coil. Obtain the expression for the energy stored in an 
inductor L connected across a source of emf. 
  
Page 5


  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
CBSE 
Class XII Physics - Set I 
Board Paper - All India – 2017 
Time: 3 hours                                                                Maximum Marks: 70 
  
General Instructions:                                                                                                                     
(i) All questions are compulsory. There are 26 questions in all. 
(ii) This question paper has five sections: Section A, Section B, Section, 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
 = 4 p ? 10
-7 
T mA
-l
 
?
0
 = 8.854 ? 10
-12
 C
2
 N
-1
 m
-2
 
0
1
4 ??
 = 9 ? 10
9
 N m
2  
C
-2
 
Mass of electron
 
= 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
 J K
-1
 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
SECTION – A 
Q. 1 Nichrome and Copper wires of same length and same radius are connected in 
series. Current I is passed through them. Which wire gets heated up more? Justify 
your answer. [1] 
 
Q. 2 Do electromagnetic waves carry energy and momentum?  [1] 
 
Q. 3 How does the angle of minimum deviation of a glass prism vary, if the incident 
violet light is replaced by red light? Give reason. [1] 
 
Q. 4 Name the phenomenon which shows the quantum nature of electromagnetic 
radiation. [1] 
 
Q. 5 Predict the polarity of the capacitor in the situation described below: [1] 
 
 
SECTION – B 
Q. 6 Draw the intensity pattern for single slit diffraction and double slit 
interference. Hence, State two differences between interference and diffraction 
patterns.               [2] 
OR 
 
Unpolarised light is passed through a Polaroid P
1
. When this polarised beam passes 
through another polaroid P
2
, and if the pass axis of P
2
 makes angle ? with the pass 
axis of P
1
, then write the expression for the polarised beam passing through P
2
. 
Draw a plot showing the variation of intensity when ? varies from 0 to 2 ?.  [2] 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 7 Identify the electromagnetic waves whose wavelength vary as [2] 
(a) 10
-12
 m < ? < 10
-8
 m 
(b) 10
-3
 m < ? < 10
-1
 m 
Write one use for each. 
 
Q. 8 Find the condition under which the charged particles moving with different 
speeds in the presence of electric and magnetic field vectors can be used to select 
charged particles of a particular speed. [2] 
 
Q. 9 A 12.5 eV electron beam is used to excite a gaseous hydrogen atom at room 
temperature. Determine the wavelengths and the corresponding series of the lines 
emitted. [2] 
 
Q. 10 Write two properties of a material for making (a) a permanent magnet, and 
(b) an electromagnet. [2] 
 
SECTION – C 
Q. 11                [3] 
(a) The potential difference applied across a given resistor is altered so that 
the heat produced per second increases by a factor of 9. By what factor 
does the applied potential difference change? 
(b) In the figure shown, an ammeter A and a resistor of 4 ? are connected to 
the terminals of the source. The emf of the source is 12 V having an 
internal resistance of 2 ?. Calculate the voltmeter and ammeter readings. 
 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 12  [3] 
(a) How is amplitude modulation achieved? 
(b) The frequencies of two side bands in an AM wave are 640 kHz and 660 kHz, 
respectively. Find the frequencies of carrier and modulating signal. What is the 
bandwidth required for amplitude modulation? 
 
Q. 13  [3] 
(a) In the following diagram, is the junction diode forward biased or reverse 
biased? 
 
(b) Draw the circuit diagram of a full wave rectifier and state how it works. 
 
Q. 14 Using photon picture of light, show how Einstein’s photoelectric equation can 
be established. Write two features of photoelectric effect which cannot be explained 
by wave theory.  [3] 
 
Q. 15                [3] 
a) Monochromatic light of wavelength 589 nm is incident from air on a water 
surface. If µ for water is 1.33, find the wavelength, frequency and speed of 
the refracted light. 
b) A double convex lens is made of a glass of refractive index 1.55, with both 
faces of the same radius of curvature. Find the radius of curvature required, 
if the focal length is 20cm. 
 
Q. 16 Define mutual inductance between a pair of coils. Derive an expression for 
the mutual inductance of two long coaxial solenoids of same length wound one over 
the other. [3] 
OR 
Define self-inductance of a coil. Obtain the expression for the energy stored in an 
inductor L connected across a source of emf. 
  
  
 
CBSE XII  | PHYSICS 
Board Paper – All India – Set 1 2017 
 
     
Q. 17 [3] 
a) Write the principle of working of a metre bridge. 
b) In a metre bridge, the balance point is found at a distance l
1
 with resistance 
R and S as shown in the figure. 
 
An unknown resistance X is now connected in parallel to the resistance S and 
the balance point is found at a distance l
2
. Obtain a formula for X in terms of 
l
1
, l
2
 and S. 
 
Q. 18 Draw a block diagram of a generalised communication system. Write the 
functions of each of the following:  [3] 
a) Transmitter 
b) Channel 
c) Receiver 
 
Q. 19                [3] 
a) Write the functions of the three segments of a transistor. 
b) The figure shows the input waveform A and B for ‘AND’ gate. Draw the 
output waveform and write the truth table for this logic gate. 
 
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