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Class 12 Physics: CBSE Sample Question Papers (2023-24)
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Page 1
P a g e 1 | 10
CLASS : XII
SESSION: 2023-24
CBSE SAMPLE QUESTION PAPER
SUBJECT: PHYSICS (THEORY)
Maximum Marks: 70 Time Allowed: 3 hours.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and
Section E.
(3) All the sections are compulsory.
(4) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based
of 1 mark each, Section B contains five questions of two marks each, Section C
contains seven questions of three marks each, Section D contains two case study
based questions of four marks each and Section E contains three long answer
questions of five marks each.
(5) There is no overall choice. However, an internal choice has been provided in one
question in Section B, one question in Section C, one question in each CBQ in Section
D and all three questions in Section E. You have to attempt only one of the choices in
such questions.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 10
8
m/s
ii. me = 9.1 x10
-31
kg
iii. e = 1.6 x 10
-19
C
iv. µ0 = 4p x 10
-7
Tm?? -??
v. h = 6.63 x10
-34
Js
vi. e0 = 8.854 x10
-12
?? ?? ?? -?? ?? -??
vii. Avogadro’s number = 6.023 X ????
????
per gram mole
SECTION-A
1.
1. Which of the following is not the property of an equipotential surface?
(a) They do not cross each other.
(b) The work done in carrying a charge from one point to another on an
equipotential surface is zero.
(c ) For a uniform electric field, they are concentric spheres.
(d) They can be imaginary spheres.
2.
2. An electric dipole placed in an electric field of intensity 2 × 10
5
N/C at an angle of
30° experiences a torque equal to 4 Nm. The charge on the dipole of dipole length
2 cm is
(a) 7 µC (b) 8 mC (c) 2 mC (d) 5 mC
Page 2
P a g e 1 | 10
CLASS : XII
SESSION: 2023-24
CBSE SAMPLE QUESTION PAPER
SUBJECT: PHYSICS (THEORY)
Maximum Marks: 70 Time Allowed: 3 hours.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and
Section E.
(3) All the sections are compulsory.
(4) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based
of 1 mark each, Section B contains five questions of two marks each, Section C
contains seven questions of three marks each, Section D contains two case study
based questions of four marks each and Section E contains three long answer
questions of five marks each.
(5) There is no overall choice. However, an internal choice has been provided in one
question in Section B, one question in Section C, one question in each CBQ in Section
D and all three questions in Section E. You have to attempt only one of the choices in
such questions.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 10
8
m/s
ii. me = 9.1 x10
-31
kg
iii. e = 1.6 x 10
-19
C
iv. µ0 = 4p x 10
-7
Tm?? -??
v. h = 6.63 x10
-34
Js
vi. e0 = 8.854 x10
-12
?? ?? ?? -?? ?? -??
vii. Avogadro’s number = 6.023 X ????
????
per gram mole
SECTION-A
1.
1. Which of the following is not the property of an equipotential surface?
(a) They do not cross each other.
(b) The work done in carrying a charge from one point to another on an
equipotential surface is zero.
(c ) For a uniform electric field, they are concentric spheres.
(d) They can be imaginary spheres.
2.
2. An electric dipole placed in an electric field of intensity 2 × 10
5
N/C at an angle of
30° experiences a torque equal to 4 Nm. The charge on the dipole of dipole length
2 cm is
(a) 7 µC (b) 8 mC (c) 2 mC (d) 5 mC
P a g e 2 | 10
3. 3. A metallic plate exposed to white light emits electrons. For which of the following
colours of light, the stopping potential will be maximum?
(a) Blue (b) Yellow (c) Red (d) Violet
4. 4. When alpha particles are sent through a thin gold foil, most of them go straight
through the foil, because
(a) alpha particles are positively charged
(b) the mass of an alpha particle is more than the mass of an electron
(c) most of the part of an atom is empty space
(d) alpha particles move with high velocity
5. A An electron is moving along positive x-axis in a magnetic field which is parallel to
the positive y-axis. In what direction will the magnetic force be acting on the
electron?
(a) Along -x axis (b) Along -z axis
(c ) Along +z axis (d) Along -y axis
6. The relative magnetic permeability of a substance X is slightly less than unity and
that of substance Y is slightly more than unity, then
(a) X is paramagnetic and Y is ferromagnetic
(b) X is diamagnetic and Y is ferromagnetic
(c) X and Y both are paramagnetic
(d) X is diamagnetic and Y is paramagnetic
7. An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the
required shunt to increase the range to 10 A is
(a) 0.9 ohm (b ) 0.09 ohm (c) 0.03 ohm (d) 0.3 ohm
8. A An electron with angular momentum L moving around the nucleus has a
magnetic moment given by
(a) e L/ 2m (b) e L/3m (c) e L /4m (d) e L / m
9.
9. The large scale transmission of electrical energy over long distances is done with
the use of transformers. The voltage output of the generator is stepped-up because
of
(a) reduction of current (b) reduction of current and voltage both
(c) power loss is cut down (d) (a ) and (c) both
10. The diagram below shows the electric field (E) and magnetic field (B) components
of an electromagnetic wave at a certain time and location.
Page 3
P a g e 1 | 10
CLASS : XII
SESSION: 2023-24
CBSE SAMPLE QUESTION PAPER
SUBJECT: PHYSICS (THEORY)
Maximum Marks: 70 Time Allowed: 3 hours.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and
Section E.
(3) All the sections are compulsory.
(4) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based
of 1 mark each, Section B contains five questions of two marks each, Section C
contains seven questions of three marks each, Section D contains two case study
based questions of four marks each and Section E contains three long answer
questions of five marks each.
(5) There is no overall choice. However, an internal choice has been provided in one
question in Section B, one question in Section C, one question in each CBQ in Section
D and all three questions in Section E. You have to attempt only one of the choices in
such questions.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 10
8
m/s
ii. me = 9.1 x10
-31
kg
iii. e = 1.6 x 10
-19
C
iv. µ0 = 4p x 10
-7
Tm?? -??
v. h = 6.63 x10
-34
Js
vi. e0 = 8.854 x10
-12
?? ?? ?? -?? ?? -??
vii. Avogadro’s number = 6.023 X ????
????
per gram mole
SECTION-A
1.
1. Which of the following is not the property of an equipotential surface?
(a) They do not cross each other.
(b) The work done in carrying a charge from one point to another on an
equipotential surface is zero.
(c ) For a uniform electric field, they are concentric spheres.
(d) They can be imaginary spheres.
2.
2. An electric dipole placed in an electric field of intensity 2 × 10
5
N/C at an angle of
30° experiences a torque equal to 4 Nm. The charge on the dipole of dipole length
2 cm is
(a) 7 µC (b) 8 mC (c) 2 mC (d) 5 mC
P a g e 2 | 10
3. 3. A metallic plate exposed to white light emits electrons. For which of the following
colours of light, the stopping potential will be maximum?
(a) Blue (b) Yellow (c) Red (d) Violet
4. 4. When alpha particles are sent through a thin gold foil, most of them go straight
through the foil, because
(a) alpha particles are positively charged
(b) the mass of an alpha particle is more than the mass of an electron
(c) most of the part of an atom is empty space
(d) alpha particles move with high velocity
5. A An electron is moving along positive x-axis in a magnetic field which is parallel to
the positive y-axis. In what direction will the magnetic force be acting on the
electron?
(a) Along -x axis (b) Along -z axis
(c ) Along +z axis (d) Along -y axis
6. The relative magnetic permeability of a substance X is slightly less than unity and
that of substance Y is slightly more than unity, then
(a) X is paramagnetic and Y is ferromagnetic
(b) X is diamagnetic and Y is ferromagnetic
(c) X and Y both are paramagnetic
(d) X is diamagnetic and Y is paramagnetic
7. An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the
required shunt to increase the range to 10 A is
(a) 0.9 ohm (b ) 0.09 ohm (c) 0.03 ohm (d) 0.3 ohm
8. A An electron with angular momentum L moving around the nucleus has a
magnetic moment given by
(a) e L/ 2m (b) e L/3m (c) e L /4m (d) e L / m
9.
9. The large scale transmission of electrical energy over long distances is done with
the use of transformers. The voltage output of the generator is stepped-up because
of
(a) reduction of current (b) reduction of current and voltage both
(c) power loss is cut down (d) (a ) and (c) both
10. The diagram below shows the electric field (E) and magnetic field (B) components
of an electromagnetic wave at a certain time and location.
P a g e 3 | 10
The direction of the propagation of the electromagnetic wave is
(a) perpendicular to E and B and out of plane of the paper
(b) perpendicular to E and B and into the plane of the paper
(c) parallel and in the same direction as E
(d) parallel and in the same direction as B
11.
In a coil of resistance 100 ? a current is induced by changing the magnetic
flux through it. The variation of current with time is as shown in the figure. The
magnitude of change in flux through coil is
(a) 200 Wb (b) 275 Wb (c) 225 Wb (d) 250 Wb
12. The energy of an electron in n
th
orbit of hydrogen atom is En= - 13.6/?? 2
???? .The
negative sign of energy indicates that
(a) electron is free to move.
(b) electron is bound to the nucleus.
(c) kinetic energy of electron is equal to potential energy of electron.
(d) atom is radiating energy.
For Questions 13 to 16, two statements are given –one labelled Assertion (A) and other
labelled Reason (R). Select the correct answer to these questions from the options as
given below.
a) If both Assertion and Reason are true and Reason is correct explanation of
Assertion.
b) If both Assertion and Reason are true but Reason is not the correct
explanation of Assertion.
c) If Assertion is true but Reason is false.
d) If both Assertion and Reason are false.
13. Assertion (A): For the radiation of a frequency greater than the threshold frequency,
photoelectric current is proportional to the intensity of the radiation.
Reason (R) : Greater the number of energy quanta available, greater is the
number of electrons absorbing the energy quanta and greater
is number of electrons coming out of the metal.
14. Assertion (A) : Putting p type semiconductor slab directly in physical contact
with n type semiconductor slab cannot form the pn junction.
Reason (R) : The roughness at contact will be much more than inter atomic
crystal spacing and continuous flow of charge carriers is not
possible.
Page 4
P a g e 1 | 10
CLASS : XII
SESSION: 2023-24
CBSE SAMPLE QUESTION PAPER
SUBJECT: PHYSICS (THEORY)
Maximum Marks: 70 Time Allowed: 3 hours.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and
Section E.
(3) All the sections are compulsory.
(4) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based
of 1 mark each, Section B contains five questions of two marks each, Section C
contains seven questions of three marks each, Section D contains two case study
based questions of four marks each and Section E contains three long answer
questions of five marks each.
(5) There is no overall choice. However, an internal choice has been provided in one
question in Section B, one question in Section C, one question in each CBQ in Section
D and all three questions in Section E. You have to attempt only one of the choices in
such questions.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 10
8
m/s
ii. me = 9.1 x10
-31
kg
iii. e = 1.6 x 10
-19
C
iv. µ0 = 4p x 10
-7
Tm?? -??
v. h = 6.63 x10
-34
Js
vi. e0 = 8.854 x10
-12
?? ?? ?? -?? ?? -??
vii. Avogadro’s number = 6.023 X ????
????
per gram mole
SECTION-A
1.
1. Which of the following is not the property of an equipotential surface?
(a) They do not cross each other.
(b) The work done in carrying a charge from one point to another on an
equipotential surface is zero.
(c ) For a uniform electric field, they are concentric spheres.
(d) They can be imaginary spheres.
2.
2. An electric dipole placed in an electric field of intensity 2 × 10
5
N/C at an angle of
30° experiences a torque equal to 4 Nm. The charge on the dipole of dipole length
2 cm is
(a) 7 µC (b) 8 mC (c) 2 mC (d) 5 mC
P a g e 2 | 10
3. 3. A metallic plate exposed to white light emits electrons. For which of the following
colours of light, the stopping potential will be maximum?
(a) Blue (b) Yellow (c) Red (d) Violet
4. 4. When alpha particles are sent through a thin gold foil, most of them go straight
through the foil, because
(a) alpha particles are positively charged
(b) the mass of an alpha particle is more than the mass of an electron
(c) most of the part of an atom is empty space
(d) alpha particles move with high velocity
5. A An electron is moving along positive x-axis in a magnetic field which is parallel to
the positive y-axis. In what direction will the magnetic force be acting on the
electron?
(a) Along -x axis (b) Along -z axis
(c ) Along +z axis (d) Along -y axis
6. The relative magnetic permeability of a substance X is slightly less than unity and
that of substance Y is slightly more than unity, then
(a) X is paramagnetic and Y is ferromagnetic
(b) X is diamagnetic and Y is ferromagnetic
(c) X and Y both are paramagnetic
(d) X is diamagnetic and Y is paramagnetic
7. An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the
required shunt to increase the range to 10 A is
(a) 0.9 ohm (b ) 0.09 ohm (c) 0.03 ohm (d) 0.3 ohm
8. A An electron with angular momentum L moving around the nucleus has a
magnetic moment given by
(a) e L/ 2m (b) e L/3m (c) e L /4m (d) e L / m
9.
9. The large scale transmission of electrical energy over long distances is done with
the use of transformers. The voltage output of the generator is stepped-up because
of
(a) reduction of current (b) reduction of current and voltage both
(c) power loss is cut down (d) (a ) and (c) both
10. The diagram below shows the electric field (E) and magnetic field (B) components
of an electromagnetic wave at a certain time and location.
P a g e 3 | 10
The direction of the propagation of the electromagnetic wave is
(a) perpendicular to E and B and out of plane of the paper
(b) perpendicular to E and B and into the plane of the paper
(c) parallel and in the same direction as E
(d) parallel and in the same direction as B
11.
In a coil of resistance 100 ? a current is induced by changing the magnetic
flux through it. The variation of current with time is as shown in the figure. The
magnitude of change in flux through coil is
(a) 200 Wb (b) 275 Wb (c) 225 Wb (d) 250 Wb
12. The energy of an electron in n
th
orbit of hydrogen atom is En= - 13.6/?? 2
???? .The
negative sign of energy indicates that
(a) electron is free to move.
(b) electron is bound to the nucleus.
(c) kinetic energy of electron is equal to potential energy of electron.
(d) atom is radiating energy.
For Questions 13 to 16, two statements are given –one labelled Assertion (A) and other
labelled Reason (R). Select the correct answer to these questions from the options as
given below.
a) If both Assertion and Reason are true and Reason is correct explanation of
Assertion.
b) If both Assertion and Reason are true but Reason is not the correct
explanation of Assertion.
c) If Assertion is true but Reason is false.
d) If both Assertion and Reason are false.
13. Assertion (A): For the radiation of a frequency greater than the threshold frequency,
photoelectric current is proportional to the intensity of the radiation.
Reason (R) : Greater the number of energy quanta available, greater is the
number of electrons absorbing the energy quanta and greater
is number of electrons coming out of the metal.
14. Assertion (A) : Putting p type semiconductor slab directly in physical contact
with n type semiconductor slab cannot form the pn junction.
Reason (R) : The roughness at contact will be much more than inter atomic
crystal spacing and continuous flow of charge carriers is not
possible.
P a g e 4 | 10
15. Assertion (A) : An electron has a higher potential energy when it is at a location
associated with a negative value of potential and has a lower
potential energy when at a location associated with a positive
potential.
Reason (R) : Electrons move from a region of higher potential to a region of
lower potential.
16.
Assertion (A) : Propagation of light through an optical fibre is due to total
internal reflection taking place at the core-cladding interface.
Reason (R): Refractive index of the material of the cladding of the optical fibre
is greater than that of the core.
SECTION-B
17. (a) Name the device which utilizes unilateral action of a pn diode to convert
ac into dc.
(b) Draw the circuit diagram of full wave rectifier.
18. The wavelength ? of a photon and the de Broglie wavelength of an electron of mass
m have the same value. Show that the energy of the photon is 2?mc/h times the
kinetic energy of the electron, where c and h have their usual meanings.
19. A ray of monochromatic light passes through an equilateral glass prism in such a
way that the angle of incidence is equal to the angle of emergence and each of these
angles is 3/4 times the angle of the prism. Determine the angle of deviation and the
refractive index of the glass prism.
20. A heating element using nichrome connected to a 230 V supply draws an initial
current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What
is the steady temperature of the heating element if the room temperature is 27.0 °C
and the temperature coefficient of resistance of nichrome is 1.70 × 10
–4
°C
–1
?
21.
Show that the least possible distance between an object and its real image in a
convex lens is 4f, where f is the focal length of the lens.
OR
In an astronomical telescope in normal adjustment a straight black line of length L is
drawn on the objective lens. The eyepiece forms a real image of this line whose
length is ?? . What is the angular magnification of the telescope?
SECTION-C
22.
A given coin has a mass of 3.0 g. Calculate the nuclear energy that would be required
to separate all the neutrons and protons from each other. For simplicity assume that
the coin is entirely made of ????
29
63
atoms (of mass 62.92960 u).
Given mp = 1.007825u and mn = 1.008665u.
Page 5
P a g e 1 | 10
CLASS : XII
SESSION: 2023-24
CBSE SAMPLE QUESTION PAPER
SUBJECT: PHYSICS (THEORY)
Maximum Marks: 70 Time Allowed: 3 hours.
General Instructions:
(1) There are 33 questions in all. All questions are compulsory.
(2) This question paper has five sections: Section A, Section B, Section C, Section D and
Section E.
(3) All the sections are compulsory.
(4) Section A contains sixteen questions, twelve MCQ and four Assertion Reasoning based
of 1 mark each, Section B contains five questions of two marks each, Section C
contains seven questions of three marks each, Section D contains two case study
based questions of four marks each and Section E contains three long answer
questions of five marks each.
(5) There is no overall choice. However, an internal choice has been provided in one
question in Section B, one question in Section C, one question in each CBQ in Section
D and all three questions in Section E. You have to attempt only one of the choices in
such questions.
(6) Use of calculators is not allowed.
(7) You may use the following values of physical constants where ever necessary
i. c = 3 x 10
8
m/s
ii. me = 9.1 x10
-31
kg
iii. e = 1.6 x 10
-19
C
iv. µ0 = 4p x 10
-7
Tm?? -??
v. h = 6.63 x10
-34
Js
vi. e0 = 8.854 x10
-12
?? ?? ?? -?? ?? -??
vii. Avogadro’s number = 6.023 X ????
????
per gram mole
SECTION-A
1.
1. Which of the following is not the property of an equipotential surface?
(a) They do not cross each other.
(b) The work done in carrying a charge from one point to another on an
equipotential surface is zero.
(c ) For a uniform electric field, they are concentric spheres.
(d) They can be imaginary spheres.
2.
2. An electric dipole placed in an electric field of intensity 2 × 10
5
N/C at an angle of
30° experiences a torque equal to 4 Nm. The charge on the dipole of dipole length
2 cm is
(a) 7 µC (b) 8 mC (c) 2 mC (d) 5 mC
P a g e 2 | 10
3. 3. A metallic plate exposed to white light emits electrons. For which of the following
colours of light, the stopping potential will be maximum?
(a) Blue (b) Yellow (c) Red (d) Violet
4. 4. When alpha particles are sent through a thin gold foil, most of them go straight
through the foil, because
(a) alpha particles are positively charged
(b) the mass of an alpha particle is more than the mass of an electron
(c) most of the part of an atom is empty space
(d) alpha particles move with high velocity
5. A An electron is moving along positive x-axis in a magnetic field which is parallel to
the positive y-axis. In what direction will the magnetic force be acting on the
electron?
(a) Along -x axis (b) Along -z axis
(c ) Along +z axis (d) Along -y axis
6. The relative magnetic permeability of a substance X is slightly less than unity and
that of substance Y is slightly more than unity, then
(a) X is paramagnetic and Y is ferromagnetic
(b) X is diamagnetic and Y is ferromagnetic
(c) X and Y both are paramagnetic
(d) X is diamagnetic and Y is paramagnetic
7. An ammeter of resistance 0.81 ohm reads up to 1 A. The value of the
required shunt to increase the range to 10 A is
(a) 0.9 ohm (b ) 0.09 ohm (c) 0.03 ohm (d) 0.3 ohm
8. A An electron with angular momentum L moving around the nucleus has a
magnetic moment given by
(a) e L/ 2m (b) e L/3m (c) e L /4m (d) e L / m
9.
9. The large scale transmission of electrical energy over long distances is done with
the use of transformers. The voltage output of the generator is stepped-up because
of
(a) reduction of current (b) reduction of current and voltage both
(c) power loss is cut down (d) (a ) and (c) both
10. The diagram below shows the electric field (E) and magnetic field (B) components
of an electromagnetic wave at a certain time and location.
P a g e 3 | 10
The direction of the propagation of the electromagnetic wave is
(a) perpendicular to E and B and out of plane of the paper
(b) perpendicular to E and B and into the plane of the paper
(c) parallel and in the same direction as E
(d) parallel and in the same direction as B
11.
In a coil of resistance 100 ? a current is induced by changing the magnetic
flux through it. The variation of current with time is as shown in the figure. The
magnitude of change in flux through coil is
(a) 200 Wb (b) 275 Wb (c) 225 Wb (d) 250 Wb
12. The energy of an electron in n
th
orbit of hydrogen atom is En= - 13.6/?? 2
???? .The
negative sign of energy indicates that
(a) electron is free to move.
(b) electron is bound to the nucleus.
(c) kinetic energy of electron is equal to potential energy of electron.
(d) atom is radiating energy.
For Questions 13 to 16, two statements are given –one labelled Assertion (A) and other
labelled Reason (R). Select the correct answer to these questions from the options as
given below.
a) If both Assertion and Reason are true and Reason is correct explanation of
Assertion.
b) If both Assertion and Reason are true but Reason is not the correct
explanation of Assertion.
c) If Assertion is true but Reason is false.
d) If both Assertion and Reason are false.
13. Assertion (A): For the radiation of a frequency greater than the threshold frequency,
photoelectric current is proportional to the intensity of the radiation.
Reason (R) : Greater the number of energy quanta available, greater is the
number of electrons absorbing the energy quanta and greater
is number of electrons coming out of the metal.
14. Assertion (A) : Putting p type semiconductor slab directly in physical contact
with n type semiconductor slab cannot form the pn junction.
Reason (R) : The roughness at contact will be much more than inter atomic
crystal spacing and continuous flow of charge carriers is not
possible.
P a g e 4 | 10
15. Assertion (A) : An electron has a higher potential energy when it is at a location
associated with a negative value of potential and has a lower
potential energy when at a location associated with a positive
potential.
Reason (R) : Electrons move from a region of higher potential to a region of
lower potential.
16.
Assertion (A) : Propagation of light through an optical fibre is due to total
internal reflection taking place at the core-cladding interface.
Reason (R): Refractive index of the material of the cladding of the optical fibre
is greater than that of the core.
SECTION-B
17. (a) Name the device which utilizes unilateral action of a pn diode to convert
ac into dc.
(b) Draw the circuit diagram of full wave rectifier.
18. The wavelength ? of a photon and the de Broglie wavelength of an electron of mass
m have the same value. Show that the energy of the photon is 2?mc/h times the
kinetic energy of the electron, where c and h have their usual meanings.
19. A ray of monochromatic light passes through an equilateral glass prism in such a
way that the angle of incidence is equal to the angle of emergence and each of these
angles is 3/4 times the angle of the prism. Determine the angle of deviation and the
refractive index of the glass prism.
20. A heating element using nichrome connected to a 230 V supply draws an initial
current of 3.2 A which settles after a few seconds to a steady value of 2.8 A. What
is the steady temperature of the heating element if the room temperature is 27.0 °C
and the temperature coefficient of resistance of nichrome is 1.70 × 10
–4
°C
–1
?
21.
Show that the least possible distance between an object and its real image in a
convex lens is 4f, where f is the focal length of the lens.
OR
In an astronomical telescope in normal adjustment a straight black line of length L is
drawn on the objective lens. The eyepiece forms a real image of this line whose
length is ?? . What is the angular magnification of the telescope?
SECTION-C
22.
A given coin has a mass of 3.0 g. Calculate the nuclear energy that would be required
to separate all the neutrons and protons from each other. For simplicity assume that
the coin is entirely made of ????
29
63
atoms (of mass 62.92960 u).
Given mp = 1.007825u and mn = 1.008665u.
P a g e 5 | 10
23. Charges (+q) and (–q) are placed at the points A and B respectively which are a
distance 2L apart. C is the midpoint between A and B. What is the work done in
moving a charge +Q along the semicircle CRD.
24.
a.
b.
c.
The total energy of an electron in the first excited state of the hydrogen atom is
about –3.4 eV.
What is the kinetic energy of the electron in this state?
What is the potential energy of the electron in this state?
Which of the answers above would change if the choice of the zero of potential
energy is changed?
25. A wire of uniform cross-section and resistance 4 ohm is bent in the shape of square
ABCD. Point A is connected to a point P on DC by a wire AP of resistance 1 ohm.
When a potential difference is applied between A and C, the points B and P are seen
to be at the same potential. What is the resistance of the part DP?
26. The given figure shows a long straight wire of a circular cross-section (radius a)
carrying steady current I. The current I is uniformly distributed across this cross-
section. Calculate the magnetic field in the region r < a and r > a.
27.
Identify the part of the electromagnetic spectrum which:
a) produces heating effect,
b) is absorbed by the ozone layer in the atmosphere,
c) is used for studying crystal structure.
Write any one method of the production of each of the above radiations.
28. a. Define mutual inductance and write its SI unit.
Read MoreFAQs on Class 12 Physics: CBSE Sample Question Papers (2023-24)
| 1. What are the key topics covered in the Class 12 Physics syllabus for NEET preparation? |  |
Ans. The Class 12 Physics syllabus for NEET preparation includes key topics such as Electrostatics, Current Electricity, Magnetism, Electromagnetic Induction, Optics, Dual Nature of Radiation and Matter, Atoms and Nuclei, and Electronic Devices. Each topic encompasses fundamental concepts and principles that are essential for understanding the subject and performing well in examinations.
| 2. How can students effectively prepare for Physics practicals in Class 12? | |
Ans. Students can effectively prepare for Physics practicals by familiarising themselves with the experiment manuals, understanding the theoretical background of each experiment, and practising the procedures multiple times. It is also beneficial to learn how to handle laboratory equipment safely and accurately record observations and results. Regular revision of practical concepts enhances confidence and performance during practical examinations.
| 3. What is the importance of sample question papers for NEET preparation in Physics? | |
Ans. Sample question papers are crucial for NEET preparation as they provide insights into the exam pattern, types of questions, and marking scheme. Practising with these papers helps students assess their knowledge, identify weak areas, and improve their time management skills during the actual exam. Additionally, it familiarises students with the level of difficulty they can expect, enabling them to prepare more effectively.
| 4. How should students approach problem-solving in Physics for NEET? | |
Ans. Students should approach problem-solving in Physics by first reading the question carefully and identifying the underlying concepts. They should then list the known parameters and the required parameters, followed by applying relevant formulas. Breaking down complex problems into simpler steps and practising a variety of problems will enhance their analytical skills and confidence in tackling different types of questions.
| 5. What resources are recommended for studying Physics for NEET? | |
Ans. Recommended resources for studying Physics for NEET include NCERT textbooks, which provide a strong conceptual foundation, as well as reference books such as H.C. Verma's "Concepts of Physics" and D.C. Pandey's series for problem-solving. Online platforms offering video lectures, simulations, and interactive quizzes can also supplement traditional study methods, making learning more engaging and effective.
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