On this page we have uploaded UBSE Intermediate Class 12 Question Paper for Physics released by ubse.uk.gov.in. The question paper provided here from Uttarakhand State Board. Download the 2023 question paper pdf as well.
Uttarakhand State Board has published subject wise question paper for this year Class 12 students in its official portal ubse.uk.gov.in. Here we have published Class 12 UBSE question paper 2023 for Physics subject. For more information regarding Uttarakhand Intermediate Class 12, 2023 Exam Date, Exam Pattern, Time, Date, How to prepare follow our website.
Uttarakhand Board (UBSE) Intermediate Class 12 Question Papers – Physics Subject
(1) Energy of an electron, accelerated at 1 volt potential difference is-
(i) 1 Joule
(ii) 1 electron – volt
(iii) 1 erg
(iv) 1 watt
(2) Relation between current density I and drift velocity Vd is-
(i)
(ii)
(iii)
(iv)
(3) An electron enters perpendicularly in a uniform magnetic field. The path of electron will be-
(i) Parabolic
(ii) Elliptical
(iii) Circular
(iv) Straight line
(4) Lenz’s law is based on the conservation of which physical quantity?
(i) Charge
(ii) Energy
(iii) Magnetic flux
(iv) Momentum
(5) Which of the following waves are electromagnetic waves?
(i) Sound waves
(ii) Radio waves
(iii) Water waves
(iv) Waves produced in a thread
(6) A ray deviates by an angle 30° in a prism of angle 60° in minimum deviation condition. The angle of incidence of ray on prism is-
(i) 30°
(ii) 45°
(iii) 60°
(iv) 90°
(7) In hydrogen atom, radius of first orbit for electron is 0.53A°. Radius of it’s third orbit will be-
(i) 4.77A°
(ii) 1.69A°
(iii) 1.06A°
(iv) 1.0A°
(8) In p-n junction diode, the depletion layer consist of-
(i) Only holes
(ii) Only electrons
(iii) Electrons & holes both
(iv) Neither holes nor electrons
(2) The peak value of alternating current is √2 A in a circuit. Find root mean square value of current.
(3) Write the relation between focal length (F) and radius of curvature (R) of a spherical mirror.
(4) Show graphically the effect of intensity of Light on photoelectric current.
(5) Write the relation between energy and momentum of a photon.
(6) Any element has atomic number Z and mass number A. How many neutrons will be there in its nucleus.
(7) Write Boolean expression for ‘AND’ Gate.
(8) A 12pF capacitor is connected to 50v battery. How much electrostatic energy is stored in the capacitor?
(9) Give two reasons of energy loss in actual transformers.
(10) If the current becomes zero in 0.01 second in the primary coil carrying 3.0 A current then the induced e.m.f. in secondary coil is 15,000 volt. Find the Coefficient of mutual inductance between these coils.
(11) Find the frequency of an electromagnetic wave of wavelength 30,000 Å. Which part of the spectrum is represented by this wave?
(12) Light of wavelength 6000Å enters from air into a medium of refractive index 1.5. Find it’s velocity and frequency in the medium.
(13) If the critical angle of crown glass with respect to air is 41.14° then complete the adjacent ray diagram for a prism made of crown glass.
Or
Angle of polarization of a transparent medium is ip and speed of light for that medium is v. If speed of light in vacuum is c then represent ip in terms of c and v.
(14) Draw the labeled ray diagram of reflecting telescope.
(15) What percentage of a radioactive substance will remain left after four life periods.
(16) What is ‘LED’? Write two advantage of LED over conventional incandescent low power lamps.
Or
Explain the working of Zener diode.
(17) Write Coulomb’s law and show it in vector form.
(18) Two tiny spheres carrying charges 1.5 µC and 2.5 µC are located 30 cm apart. Find the electric field at the midpoint of the line joining the two charges.
(19) Write the principle of potentiometer. Potentiometer works as an ideal voltmeter why?
(20) Explain ferromagnetism on the basis of domain theory.
(21) In the circuit given below ‘B’ represents a bulb. If the frequency of source is doubled then how should ‘C’ and ‘L’ be changed so that brightness of the bulb remains same.
(22) The refractive index of a convex lens material is n. It is dipped in a medium of refractive index n,. A parallel beam of light incidents on lens. Depict the path of refracted ray in following conditions:
(i) n1 > n
(ii) n1 < n
(iii) n1 = n
Or
A concave mirror and a convex lens are dipped in water. What will be change in their focal length in comparison to that of in air?
(23) If the frequency of incident light on the cathode of photocell is doubled then how will the following change:
(i) Kinetic energy of electrons
(ii) Photoelectric current
(iii) Stopping potential
Justify your answer.
(24) Draw the graph of binding energy per nucleon as a function of mass number and explain what is the relation of binding energy per nucleon with stability of nucleus?
Or
0.993 gm helium is produced by 1gm hydrogen in nuclear fusion. If the efficiency of generator is 5% then calculate the energy produced.
(25) Draw the logic symbol of NAND and NOR gate and give their truth table.
Or
Draw circuit diagram of full wave rectifier by using p-n junction diode. Explain it’s working by drawing input and output voltage waveforms.
(26) In the figure, find potential difference between P and Q. Also find currents flowing in different resistances.
Or
Give principle of meter bridge. How will you find resistance of a metallic wire with the help of it. Derive the formula used.
(27) In an atom, an electron is revolving round the nucleus in an orbit of radius 0.7Å with the velocity of 6.6×104 m/s. Find the equivalent current and the equivalent magnetic moment.
Or
Give Biot – Savart law. Find an expression for intensity of magnetic field at the centre of current carrying circular loop.
(28) Derive the following expression for lens maker formula, where symbols have their usual meanings-
1/f = (n – 1) (1/R1 – 1/R2)
Or
What do you understand by secondary wavelets? Explain the reflection on the basis of Huygen’s secondary wavelets principle.