Physics: Sample Question Paper- 2, Class 12 | Physics Class 12 - NEET PDF Download

 Page 1


  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
CBSE Board 
Class XII Physics 
Sample Paper - 2 
 
Time:  Three Hours Maximum Marks: 70 
 
General Instructions 
(a) All questions are compulsory. 
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 
16 carry two marks each, questions 17 to 25 carry three marks each and questions 
27 to 29 carry five marks each. 
(c) Question 26 is a value based question carrying four marks. 
(d) 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 three questions of five 
marks each. You have to attempt only one of the given choices in such questions. 
(e) Use of calculator is not permitted. 
(f) You may use the following physical constants wherever necessary. 
-1
-1
-1
19
8
34
7
23
23
27
 C
 m s
 J s
 T ma
 J K
 /mole
 kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
?? 
 
 
1. In spite of having magnitude as well as direction the current is a scalar quantity. Why?   
 (1) 
2. Give the direction in which induced current flows in the wire loop when the magnet 
moves towards the loop as shown below: 
   (1) 
 
Page 2


  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
CBSE Board 
Class XII Physics 
Sample Paper - 2 
 
Time:  Three Hours Maximum Marks: 70 
 
General Instructions 
(a) All questions are compulsory. 
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 
16 carry two marks each, questions 17 to 25 carry three marks each and questions 
27 to 29 carry five marks each. 
(c) Question 26 is a value based question carrying four marks. 
(d) 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 three questions of five 
marks each. You have to attempt only one of the given choices in such questions. 
(e) Use of calculator is not permitted. 
(f) You may use the following physical constants wherever necessary. 
-1
-1
-1
19
8
34
7
23
23
27
 C
 m s
 J s
 T ma
 J K
 /mole
 kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
?? 
 
 
1. In spite of having magnitude as well as direction the current is a scalar quantity. Why?   
 (1) 
2. Give the direction in which induced current flows in the wire loop when the magnet 
moves towards the loop as shown below: 
   (1) 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
3. How is the current represented mathematically in forward bias?  (1) 
 
4. What is the ratio of speed of infrared rays and ultraviolet rays in vacuum?  (1) 
 
5. How will the size of an object appear to change when viewed by a telescope having focal 
length of the objective and eyepiece as 60 cm and 5 cm respectively?  (1)  
 
6. Find the ratio of nuclear densities of the two nuclei having mass numbers in the ratio 
1:4?  (1) 
 
7. A. C. power is transmitted from one station to another at highest possible voltage. Why?  
 (1)   
8. Why do semiconductor devices not work at absolute zero temperature?  (1)  
 
9. An electric dipole with dipole moment 
9
4 10
?
? C m is aligned at
o
30 with the direction 
of a uniform electric field of magnitude 
41
5 10 NC
?
? . Calculate the magnitude of the 
torque acting on the dipole.  (2) 
 
10. What is the change in resistance of a wire when its radius is halved and the length is 
reduced to one fourth of its original value?  (2) 
 
11. In Young’s double slit experiment the size of slits is taken of the order of the wavelength 
of the light used in the experiment. Give reason for it.  (2) 
 
12. Why are ferromagnetic materials used in memory devices?  (2) 
 
13. Find the wavelength of electromagnetic waves of frequency 6 x 10
12
 Hz in free space. 
Give the two applications of this wave.  (2) 
 
14. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the 
change in its focal length when it is immersed in water of refractive index of 4/3.  (2) 
 
15. The given graph shows the variation of charge q versus potential difference V for 
capacitors
12
and CC . The two capacitors have same plate separation. But the plate area 
of
2
C is double than that of
1
C
. Which of the lines in the graph correspond to 
12
and CC
and why? 
Page 3


  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
CBSE Board 
Class XII Physics 
Sample Paper - 2 
 
Time:  Three Hours Maximum Marks: 70 
 
General Instructions 
(a) All questions are compulsory. 
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 
16 carry two marks each, questions 17 to 25 carry three marks each and questions 
27 to 29 carry five marks each. 
(c) Question 26 is a value based question carrying four marks. 
(d) 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 three questions of five 
marks each. You have to attempt only one of the given choices in such questions. 
(e) Use of calculator is not permitted. 
(f) You may use the following physical constants wherever necessary. 
-1
-1
-1
19
8
34
7
23
23
27
 C
 m s
 J s
 T ma
 J K
 /mole
 kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
?? 
 
 
1. In spite of having magnitude as well as direction the current is a scalar quantity. Why?   
 (1) 
2. Give the direction in which induced current flows in the wire loop when the magnet 
moves towards the loop as shown below: 
   (1) 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
3. How is the current represented mathematically in forward bias?  (1) 
 
4. What is the ratio of speed of infrared rays and ultraviolet rays in vacuum?  (1) 
 
5. How will the size of an object appear to change when viewed by a telescope having focal 
length of the objective and eyepiece as 60 cm and 5 cm respectively?  (1)  
 
6. Find the ratio of nuclear densities of the two nuclei having mass numbers in the ratio 
1:4?  (1) 
 
7. A. C. power is transmitted from one station to another at highest possible voltage. Why?  
 (1)   
8. Why do semiconductor devices not work at absolute zero temperature?  (1)  
 
9. An electric dipole with dipole moment 
9
4 10
?
? C m is aligned at
o
30 with the direction 
of a uniform electric field of magnitude 
41
5 10 NC
?
? . Calculate the magnitude of the 
torque acting on the dipole.  (2) 
 
10. What is the change in resistance of a wire when its radius is halved and the length is 
reduced to one fourth of its original value?  (2) 
 
11. In Young’s double slit experiment the size of slits is taken of the order of the wavelength 
of the light used in the experiment. Give reason for it.  (2) 
 
12. Why are ferromagnetic materials used in memory devices?  (2) 
 
13. Find the wavelength of electromagnetic waves of frequency 6 x 10
12
 Hz in free space. 
Give the two applications of this wave.  (2) 
 
14. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the 
change in its focal length when it is immersed in water of refractive index of 4/3.  (2) 
 
15. The given graph shows the variation of charge q versus potential difference V for 
capacitors
12
and CC . The two capacitors have same plate separation. But the plate area 
of
2
C is double than that of
1
C
. Which of the lines in the graph correspond to 
12
and CC
and why? 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
 (2) 
 
16. Explain how the maximum kinetic energy of the electrons emitted from a metal surface 
varies with the frequency of incident radiation.  
OR 
Draw a graph showing the variation of stopping potential with frequency of incident 
radiation in relation to photo electric effect. Deduce an expression for the slope of this 
graph using Einstein’s photoelectric equation.  (2) 
 
17. S 1 and S 2 are two hollow concentric spheres enclosing charges Q and 2Q respectively. 
(i) What is ratio of the electric flux through S 1 and S 2? 
(ii) How will the electric flux through the sphere S 1 change, if a medium of dielectric 
constant 5 is introduced in the space inside S 1 in place of air?   (3) 
 
18. Two dielectric slabs of dielectric constants K 1 and K 2 and of equal width are filled in 
between the two plates, each of area A of the parallel plate capacitor. How does the 
capacitance of the capacitor get affected?  (3) 
 
19. A point charge +10 ?C is at a distance 5 cm directly above the center of a square of side 
10 cm as shown in figure. 
 
 
Page 4


  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
CBSE Board 
Class XII Physics 
Sample Paper - 2 
 
Time:  Three Hours Maximum Marks: 70 
 
General Instructions 
(a) All questions are compulsory. 
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 
16 carry two marks each, questions 17 to 25 carry three marks each and questions 
27 to 29 carry five marks each. 
(c) Question 26 is a value based question carrying four marks. 
(d) 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 three questions of five 
marks each. You have to attempt only one of the given choices in such questions. 
(e) Use of calculator is not permitted. 
(f) You may use the following physical constants wherever necessary. 
-1
-1
-1
19
8
34
7
23
23
27
 C
 m s
 J s
 T ma
 J K
 /mole
 kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
?? 
 
 
1. In spite of having magnitude as well as direction the current is a scalar quantity. Why?   
 (1) 
2. Give the direction in which induced current flows in the wire loop when the magnet 
moves towards the loop as shown below: 
   (1) 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
3. How is the current represented mathematically in forward bias?  (1) 
 
4. What is the ratio of speed of infrared rays and ultraviolet rays in vacuum?  (1) 
 
5. How will the size of an object appear to change when viewed by a telescope having focal 
length of the objective and eyepiece as 60 cm and 5 cm respectively?  (1)  
 
6. Find the ratio of nuclear densities of the two nuclei having mass numbers in the ratio 
1:4?  (1) 
 
7. A. C. power is transmitted from one station to another at highest possible voltage. Why?  
 (1)   
8. Why do semiconductor devices not work at absolute zero temperature?  (1)  
 
9. An electric dipole with dipole moment 
9
4 10
?
? C m is aligned at
o
30 with the direction 
of a uniform electric field of magnitude 
41
5 10 NC
?
? . Calculate the magnitude of the 
torque acting on the dipole.  (2) 
 
10. What is the change in resistance of a wire when its radius is halved and the length is 
reduced to one fourth of its original value?  (2) 
 
11. In Young’s double slit experiment the size of slits is taken of the order of the wavelength 
of the light used in the experiment. Give reason for it.  (2) 
 
12. Why are ferromagnetic materials used in memory devices?  (2) 
 
13. Find the wavelength of electromagnetic waves of frequency 6 x 10
12
 Hz in free space. 
Give the two applications of this wave.  (2) 
 
14. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the 
change in its focal length when it is immersed in water of refractive index of 4/3.  (2) 
 
15. The given graph shows the variation of charge q versus potential difference V for 
capacitors
12
and CC . The two capacitors have same plate separation. But the plate area 
of
2
C is double than that of
1
C
. Which of the lines in the graph correspond to 
12
and CC
and why? 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
 (2) 
 
16. Explain how the maximum kinetic energy of the electrons emitted from a metal surface 
varies with the frequency of incident radiation.  
OR 
Draw a graph showing the variation of stopping potential with frequency of incident 
radiation in relation to photo electric effect. Deduce an expression for the slope of this 
graph using Einstein’s photoelectric equation.  (2) 
 
17. S 1 and S 2 are two hollow concentric spheres enclosing charges Q and 2Q respectively. 
(i) What is ratio of the electric flux through S 1 and S 2? 
(ii) How will the electric flux through the sphere S 1 change, if a medium of dielectric 
constant 5 is introduced in the space inside S 1 in place of air?   (3) 
 
18. Two dielectric slabs of dielectric constants K 1 and K 2 and of equal width are filled in 
between the two plates, each of area A of the parallel plate capacitor. How does the 
capacitance of the capacitor get affected?  (3) 
 
19. A point charge +10 ?C is at a distance 5 cm directly above the center of a square of side 
10 cm as shown in figure. 
 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
What is the magnitude of the electric flux through the square? 
OR 
A parallel plate capacitor with air as dielectric is charged by a d. c. source to a potential V. 
Without disconnecting the capacitor from the source, air is replaced by another dielectric 
medium of dielectric constant 10. How does electric field between the plates and energy 
stored in the capacitor change?   (3) 
 
20. State the condition under which the phenomenon of resonance occurs in a series LCR 
circuit. Plot a graph showing variation of current with frequency of a.c. source in a 
series LCR circuit.  (3) 
 
21. Two coherent sources whose intensity ratio is 81:1 produce interference fringes. Find 
the ratio of intensity of maxima and minima in fringe system.  (3) 
 
22. A long solenoid with 15 turns per cm has a small loop of area 2.0 cm
2 
placed inside 
normal to the axis of the solenoid. If the current carried by the solenoid changes 
steadily from 2A to 4A in 0.1 sec, what is the induced emf in the loop while the current 
is changing?  (3) 
 
23. How does the size of a nucleus depend on its mass number? Explain why the density of 
nuclear matter is independent of the size of nucleus.  (3) 
 
24. Give the frequency ranges of the following: 
(i) High frequency band (HF)  
(ii) Ultra – high frequency band (UHF)  
(iii) Super – high frequency band (SHF)  (3) 
 
25.  
(a) State two advantages of pulse code modulation over amplitude modulation. 
(b) What is the range of FM signals? Why is an FM signal less susceptible to noise than 
AM signal?  (3 marks) 
 
26. Shobha and Naina are two friends who are married. Shobha is very poor and a childless 
widow whereas Naina is having a good economic status. Once Naina noticed that 
Shobha’s eyesight has become weak and she was not even able to read letters written 
on signboards from a distance. Naina asked Shobha that why she did not take care of 
this, Shobha that she did not have enough money for its remedy so she did not see the 
doctor. Listening to this, Naina took Shobha to an eye specialist and asked the whole 
expenditure for its remedy. Doctor said that it is the case of Myopia and can be resolved 
without any major expenditure. After the treatment, Shobha’s eyesight was better than 
before. 
 
 
Page 5


  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
CBSE Board 
Class XII Physics 
Sample Paper - 2 
 
Time:  Three Hours Maximum Marks: 70 
 
General Instructions 
(a) All questions are compulsory. 
(b) There are 29 questions in total. Questions 1 to 8 carry one mark each, questions 9 to 
16 carry two marks each, questions 17 to 25 carry three marks each and questions 
27 to 29 carry five marks each. 
(c) Question 26 is a value based question carrying four marks. 
(d) 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 three questions of five 
marks each. You have to attempt only one of the given choices in such questions. 
(e) Use of calculator is not permitted. 
(f) You may use the following physical constants wherever necessary. 
-1
-1
-1
19
8
34
7
23
23
27
 C
 m s
 J s
 T ma
 J K
 /mole
 kg
1.6 10
3 10
6.6 10
4 10
1.38 10
6.023 10
1.6 10
?
?
?
?
??
??
??
??
??
??
??
o
B
A
n
e
c
h
K
N
m
?? 
 
 
1. In spite of having magnitude as well as direction the current is a scalar quantity. Why?   
 (1) 
2. Give the direction in which induced current flows in the wire loop when the magnet 
moves towards the loop as shown below: 
   (1) 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
3. How is the current represented mathematically in forward bias?  (1) 
 
4. What is the ratio of speed of infrared rays and ultraviolet rays in vacuum?  (1) 
 
5. How will the size of an object appear to change when viewed by a telescope having focal 
length of the objective and eyepiece as 60 cm and 5 cm respectively?  (1)  
 
6. Find the ratio of nuclear densities of the two nuclei having mass numbers in the ratio 
1:4?  (1) 
 
7. A. C. power is transmitted from one station to another at highest possible voltage. Why?  
 (1)   
8. Why do semiconductor devices not work at absolute zero temperature?  (1)  
 
9. An electric dipole with dipole moment 
9
4 10
?
? C m is aligned at
o
30 with the direction 
of a uniform electric field of magnitude 
41
5 10 NC
?
? . Calculate the magnitude of the 
torque acting on the dipole.  (2) 
 
10. What is the change in resistance of a wire when its radius is halved and the length is 
reduced to one fourth of its original value?  (2) 
 
11. In Young’s double slit experiment the size of slits is taken of the order of the wavelength 
of the light used in the experiment. Give reason for it.  (2) 
 
12. Why are ferromagnetic materials used in memory devices?  (2) 
 
13. Find the wavelength of electromagnetic waves of frequency 6 x 10
12
 Hz in free space. 
Give the two applications of this wave.  (2) 
 
14. A convex lens of refractive index 1.5 has a focal length of 18 cm in air. Calculate the 
change in its focal length when it is immersed in water of refractive index of 4/3.  (2) 
 
15. The given graph shows the variation of charge q versus potential difference V for 
capacitors
12
and CC . The two capacitors have same plate separation. But the plate area 
of
2
C is double than that of
1
C
. Which of the lines in the graph correspond to 
12
and CC
and why? 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
 (2) 
 
16. Explain how the maximum kinetic energy of the electrons emitted from a metal surface 
varies with the frequency of incident radiation.  
OR 
Draw a graph showing the variation of stopping potential with frequency of incident 
radiation in relation to photo electric effect. Deduce an expression for the slope of this 
graph using Einstein’s photoelectric equation.  (2) 
 
17. S 1 and S 2 are two hollow concentric spheres enclosing charges Q and 2Q respectively. 
(i) What is ratio of the electric flux through S 1 and S 2? 
(ii) How will the electric flux through the sphere S 1 change, if a medium of dielectric 
constant 5 is introduced in the space inside S 1 in place of air?   (3) 
 
18. Two dielectric slabs of dielectric constants K 1 and K 2 and of equal width are filled in 
between the two plates, each of area A of the parallel plate capacitor. How does the 
capacitance of the capacitor get affected?  (3) 
 
19. A point charge +10 ?C is at a distance 5 cm directly above the center of a square of side 
10 cm as shown in figure. 
 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
What is the magnitude of the electric flux through the square? 
OR 
A parallel plate capacitor with air as dielectric is charged by a d. c. source to a potential V. 
Without disconnecting the capacitor from the source, air is replaced by another dielectric 
medium of dielectric constant 10. How does electric field between the plates and energy 
stored in the capacitor change?   (3) 
 
20. State the condition under which the phenomenon of resonance occurs in a series LCR 
circuit. Plot a graph showing variation of current with frequency of a.c. source in a 
series LCR circuit.  (3) 
 
21. Two coherent sources whose intensity ratio is 81:1 produce interference fringes. Find 
the ratio of intensity of maxima and minima in fringe system.  (3) 
 
22. A long solenoid with 15 turns per cm has a small loop of area 2.0 cm
2 
placed inside 
normal to the axis of the solenoid. If the current carried by the solenoid changes 
steadily from 2A to 4A in 0.1 sec, what is the induced emf in the loop while the current 
is changing?  (3) 
 
23. How does the size of a nucleus depend on its mass number? Explain why the density of 
nuclear matter is independent of the size of nucleus.  (3) 
 
24. Give the frequency ranges of the following: 
(i) High frequency band (HF)  
(ii) Ultra – high frequency band (UHF)  
(iii) Super – high frequency band (SHF)  (3) 
 
25.  
(a) State two advantages of pulse code modulation over amplitude modulation. 
(b) What is the range of FM signals? Why is an FM signal less susceptible to noise than 
AM signal?  (3 marks) 
 
26. Shobha and Naina are two friends who are married. Shobha is very poor and a childless 
widow whereas Naina is having a good economic status. Once Naina noticed that 
Shobha’s eyesight has become weak and she was not even able to read letters written 
on signboards from a distance. Naina asked Shobha that why she did not take care of 
this, Shobha that she did not have enough money for its remedy so she did not see the 
doctor. Listening to this, Naina took Shobha to an eye specialist and asked the whole 
expenditure for its remedy. Doctor said that it is the case of Myopia and can be resolved 
without any major expenditure. After the treatment, Shobha’s eyesight was better than 
before. 
 
 
  
 
CBSE XII  |  PHYSICS 
Sample Paper – 2 
 
     
(a) What are the benefits of true friendships? 
(b) The far point of Shobha’s eye is at a distance of 0.1 m. What power lens is required 
to see distant objects? (4) 
 
27. Using Ampere’s circuital law, derive an expression for the magnetic field along the axis 
of a toroidal solenoid. 
OR 
Derive an expression for the torque on a rectangular coil of area A carrying current I placed 
in a magnetic field B at an angle ? to the direction of the field.  (5) 
 
28. Derive lens maker’s formula for a double convex lens. 
OR 
Draw a ray diagram of a compound microscope showing the final image formation at least 
distance of distinct vision D. State its working principle. Show that its magnifying power is 
given as 
o
o e e
vD 11
M
Fv
??
? ? ?
??
??
u
    (5) 
 
29. The circuit symbol of a logic gate and two input waveforms A and B are shown in the 
figure given below. 
 
 
 
i) name the logic gate 
ii) write its truth table  
iii) Tabulate the details of output waveform & represent its output waveform 
graphically. 
OR 
With the help of a labeled circuit diagram, describe working principle of a common emitter 
amplifier using a p –n –p transistor. Define the terms current gain and voltage gain and write 
their expressions.  (5)