KENDRIYA VIDYALAYA SANGATHAN MUMBAI REGION
PREBOARD-1 EXAMINATION (2025-26)
SET – 1
SUBJECT: PHYSICS-042 (THEORY)
Maximum Marks: 70 Marks Time: 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 two
questions in Section B, one question in Section C 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 108 m s-1
ii. me = 9.1 x10-31 kg
iii. e = 1.6 x 10-19 C
iv. μ0 = 4π x 10-7 TmA−
v. h = 6.63 x10-34 Js
vi. ε0 = 8.854 x10-12 C N− m−
vii. Avogadro’s number = 6.023 X 10 per gram mole
SECTION A
1. The threshold frequency for a photosensitive metal is 3.3 × 10 14 Hz. If light of frequency 1
8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectron
emission is nearly
Page 1 of 9
, (a) 1 V (b) 2 V (c) 3 V (d) 5 V
2. A wire of resistance 12Ω/m is bent to form a complete circle of radius 10 cm. The 1
resistance between its two diametrically opposite points A and B as shown in figure is
(a) 3 Ω (b) 6 π Ω (c) 6 Ω (d) 0.6πΩ
3. A cell of emf E and internal resistance r is connected across a variable external 1
resistance R. The graph of terminal potential difference V as a function of R is
4. The impurity atoms to be doped in pure silicon to form p-type semiconductor are, of 1
(a) phosphorus (b) germanium (c) antimony (d) aluminium
5. In the circuit shown in figure, if the diode forward voltage is 0.3 V, the 1
voltage difference between A and B is
(a) 1.3 V (b) 2.3 V (c) 0 (d) 0.5 V
6. The ratio of energies of the hydrogen atom in its first to second excited state is 1
(a) 1 : 4 (b) 4 : 1 (c) 4 : 9 (d) 9 : 4
7. If the focal length of objective lens is increased, then magnifying power of 1
(a) microscope will increase but that of telescope decrease
(b) microscope and telescope both will increase
(c) microscope and telescope both will decrease
(d) microscope will decrease but that of telescope will increase
8. The angle between electric field and equipotential surface is 1
(a) 90o always (b) 00 always (c) 00 to 90o (d) 0o to 180o
Page 2 of 9
PREBOARD-1 EXAMINATION (2025-26)
SET – 1
SUBJECT: PHYSICS-042 (THEORY)
Maximum Marks: 70 Marks Time: 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 two
questions in Section B, one question in Section C 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 108 m s-1
ii. me = 9.1 x10-31 kg
iii. e = 1.6 x 10-19 C
iv. μ0 = 4π x 10-7 TmA−
v. h = 6.63 x10-34 Js
vi. ε0 = 8.854 x10-12 C N− m−
vii. Avogadro’s number = 6.023 X 10 per gram mole
SECTION A
1. The threshold frequency for a photosensitive metal is 3.3 × 10 14 Hz. If light of frequency 1
8.2 × 1014 Hz is incident on this metal, the cut-off voltage for the photoelectron
emission is nearly
Page 1 of 9
, (a) 1 V (b) 2 V (c) 3 V (d) 5 V
2. A wire of resistance 12Ω/m is bent to form a complete circle of radius 10 cm. The 1
resistance between its two diametrically opposite points A and B as shown in figure is
(a) 3 Ω (b) 6 π Ω (c) 6 Ω (d) 0.6πΩ
3. A cell of emf E and internal resistance r is connected across a variable external 1
resistance R. The graph of terminal potential difference V as a function of R is
4. The impurity atoms to be doped in pure silicon to form p-type semiconductor are, of 1
(a) phosphorus (b) germanium (c) antimony (d) aluminium
5. In the circuit shown in figure, if the diode forward voltage is 0.3 V, the 1
voltage difference between A and B is
(a) 1.3 V (b) 2.3 V (c) 0 (d) 0.5 V
6. The ratio of energies of the hydrogen atom in its first to second excited state is 1
(a) 1 : 4 (b) 4 : 1 (c) 4 : 9 (d) 9 : 4
7. If the focal length of objective lens is increased, then magnifying power of 1
(a) microscope will increase but that of telescope decrease
(b) microscope and telescope both will increase
(c) microscope and telescope both will decrease
(d) microscope will decrease but that of telescope will increase
8. The angle between electric field and equipotential surface is 1
(a) 90o always (b) 00 always (c) 00 to 90o (d) 0o to 180o
Page 2 of 9
