Colours observed on a CD (Compact Disk) is due to
- AReflection
- BDiffraction
- CDispersion
- DAbsorption
Question types
MODEL PAPER 2025 question types
38 questions across 6 question groups — pick any mix to generate a Physics paper with step-by-step answer keys.
38
Questions
6
Question groups
5
Question types
01
M.C.Q [1M]
12 Q→02Assertion (A) & Reason (B) MCQ
4 Q→03Short Answer Type Questions [2M]
6 Q→043 Marks Question
8 Q→054 Marks Questions
2 Q→06Long Answer Type Questions [5M]
6 Q→Sample Questions
MODEL PAPER 2025 questions
One sample from each question group in this chapter. Select any group above to see the full set with answer keys.
In a series LCR circuit, the voltage across the resistance, capacitance and inductance is 10 V each. If the capacitance is short circuited the voltage across the inductance will be
- A10 V
- B$10 \sqrt{2} V$
- C$10 / \sqrt{2} V$
- D20 V
Correct match of column I with column II is
| C-1 (waves) | C-II (Production) |
| (1) Infra-red | P. Rapid vibration of electrons in aerials |
| (2) Radio | Q. Electrons in atoms emit light when they move from higher to lower energy level. |
| (3) Light | R. Klystron valve |
| (4) Microwave | S. Vibration of atoms and molecules |
- A1-P, 2-R, 3-S, 4-Q
- B
- C1-Q, 2-P, 3-S, 4-R
- D1-S. 2-R, 3-P, 4-Q
A long straight wire of circular cross section of radius'a carries a steady current 1. The current is uniformly distributed across its cross section. The ratio of magnitudes of the magnetic field at a point a/2 above the surface of wire to that of a point a 2 below its surface is
- A4:1
- B1:1
- C4:3
- D3:4
A conducting wire connects two charged conducting spheres such that they attain equilibrium with respect to each other. The distance of separation between the two spheres is very large as compared to either of their radii.
The ratio of the magnitudes of the electric fields at the surfaces of the two spheres is
The ratio of the magnitudes of the electric fields at the surfaces of the two spheres is
- A$\frac{r_1}{r_2}$
- B$\frac{r_2}{r_1}$
- C$\frac{r_2^2}{r_1^2}$
- D$\frac{r_1^2}{r_2^2}$
Assertion (A): de Broglie's wavelength of a freely falling body keeps decreasing with time.
Reason(R): The momentum of the freely falling body increases with time.
Reason(R): The momentum of the freely falling body increases with time.
- AIf both Assertion and Reason are true and Reason is the correct explanation of Assertion
- B
- C
- D
Assertion (A): Nuclei having mass number about 60 are least stable.
Reason(R): When two or more light nuclei are combined into a heavier nucleus then the binding energy per nucleon will decrease.
Reason(R): When two or more light nuclei are combined into a heavier nucleus then the binding energy per nucleon will decrease.
- A
- B
- C
- D
Assertion (A): On increasing the current sensitivity of a galvanometer by increasing the number of turns may not necessarily increase its voltage sensitivity.
Reason(R): The resistance of the coil of the galvanometer increases on increasing the number of turns.
Reason(R): The resistance of the coil of the galvanometer increases on increasing the number of turns.
- A
- B
- C
- D
Assertion (A): In a hydrogen atom there is only one electron but its emission spectrum shows many lines.
Reason(R): In a given sample of hydrogen there are many atoms each containing one electron; hence many electrons in different atoms may be in different orbits so many transitions from higher to lower orbits are possible.
Reason(R): In a given sample of hydrogen there are many atoms each containing one electron; hence many electrons in different atoms may be in different orbits so many transitions from higher to lower orbits are possible.
- A
- B
- C
- D
A platinum surface having work function 5.63 eV is illuminated by a monochromatic source of $1.6 \times 10^{15} Hz$ Hz. What will be the minimum wavelength associated with the ejected electron.
View full solution →A beam of light consisting of two wavelengths, 4000 Å and 6000 Å, is used to obtain interference fringes in a Young’s double-slit experiment. What is the least distance from the central maximum where the dark fringe is obtained?
In Young’s double-slit experiment using monochromatic light of wavelength λ, the intensities of two sources is I. What is the intensity of light at a point where path difference between wave front is $\lambda / 4$ ?
View full solution →What should be the radius ‘r’ of nearest possible orbits of satellite of mass ‘m’ revolving around the planet of mass ‘M’ as per Bohr Postulates in terms of m, M, G, h where G is Gravitational constant and h is plank’s constant.
(I) Draw the energy band diagram for P-type semiconductor at (i) T=0K and (ii) room temperature.
(II) In the given diagram considering an ideal diode, in which condition will the bulb glow
(a) when the switch is open
(b) when the switch is closed
Justify your answer.
(II) In the given diagram considering an ideal diode, in which condition will the bulb glow
(a) when the switch is open
(b) when the switch is closed
Justify your answer.
Find the expression for the capacitance of a parallel plate capacitor of plate area A and plate separation d when (I) a dielectric slab of thickness t and (II) a metallic slab of thickness t, where (t < d) are introduced one by one between the plates of the capacitor. In which case would the capacitance be more and why?
(I) Identify the circuit elements X and Y as shown in the given block diagram and draw the output waveforms of X and Y.
(II) If the centre tapping is shifted towards Diode D1 as shown in the diagram, draw the output waveform of the given circuit.
(II) If the centre tapping is shifted towards Diode D1 as shown in the diagram, draw the output waveform of the given circuit.
(II) (a) Define electric flux and write its SI unit.
(b) Use Gauss᾿s law to obtain the expression for the electric field due to a uniformly charged infinite plane sheet of charge.
(b) Use Gauss᾿s law to obtain the expression for the electric field due to a uniformly charged infinite plane sheet of charge.
State Gauss᾿s theorem in electrostatics. Using this theorem, derive an expression for the electric field due to an infinitely long straight wire of linear charge density $\lambda$.
View full solution →
Motion of Charge in Magnetic Field
An electron with speed $V_0$ << c moves in a circle of radius $r _{\circ}$ in a uniform magnetic field. This electron is able to traverse a circular path as the magnetic force acting on the electron is perpendicular to both $V_0$ and B ,as shown in the figure. This force continuously deflects the particle sideways without changing its speed and the particle will move along a circle perpendicular to the field. The time required for one revolution of the electron is $T _{ o }$.
(i) If the speed of the electron is now doubled to 2vo. The radius of the circle will change to
(A) $4 r_0$ (B) $2 r_0$ (C) $r _{ o }$ (D) $r _0 / 2$
(ii) If v = 2vo, then the time required for one revolution of the electron (To ) will change to
(A) $4 T_0$ (B) $2 T_{ O }$ (C) $T _{ o }$ (D) $T _{ d } / 2$
(iii) A charged particles is projected in a magnetic field . The acceleration of the particle is found to be. Find the value of x.
(A) $4 ms^{-2}$ (B) $-4 ms^{-2}$ (C) $-2 ms^{-2}$ (D) $2 ms^{-2}$
(iv) If the given electron has a velocity not perpendicular to B, then trajectory of the electron is
(A) straight line (B) circular (C) helical (D) zig-zag
OR
If this electron of charge (e) is moving parallel to uniform magnetic field with constant velocity v, the force acting on the electron is
(A) Bev (B) Be/v (C) B/ev (D) Zero
View full solution →An electron with speed $V_0$ << c moves in a circle of radius $r _{\circ}$ in a uniform magnetic field. This electron is able to traverse a circular path as the magnetic force acting on the electron is perpendicular to both $V_0$ and B ,as shown in the figure. This force continuously deflects the particle sideways without changing its speed and the particle will move along a circle perpendicular to the field. The time required for one revolution of the electron is $T _{ o }$.
(i) If the speed of the electron is now doubled to 2vo. The radius of the circle will change to
(A) $4 r_0$ (B) $2 r_0$ (C) $r _{ o }$ (D) $r _0 / 2$
(ii) If v = 2vo, then the time required for one revolution of the electron (To ) will change to
(A) $4 T_0$ (B) $2 T_{ O }$ (C) $T _{ o }$ (D) $T _{ d } / 2$
(iii) A charged particles is projected in a magnetic field . The acceleration of the particle is found to be. Find the value of x.
(A) $4 ms^{-2}$ (B) $-4 ms^{-2}$ (C) $-2 ms^{-2}$ (D) $2 ms^{-2}$
(iv) If the given electron has a velocity not perpendicular to B, then trajectory of the electron is
(A) straight line (B) circular (C) helical (D) zig-zag
OR
If this electron of charge (e) is moving parallel to uniform magnetic field with constant velocity v, the force acting on the electron is
(A) Bev (B) Be/v (C) B/ev (D) Zero
(I) (a) Write two limitations of ohm’s law. Plot their I-V characteristics.
(b) A heating element connected across a battery of 100 V having an internal resistance of $1 \Omega$ draws an initial current of 10 A at room temperature 20.0 °C which settles after a few seconds to a steady value. What is the power consumed by battery itself after the steady temperature of 320.0 °C is attained? Temperature coefficient of resistance averaged over the temperature range involved is $3.70 \times 10^{-4}{ }^{\circ} C ^{-1}$.
View full solution →(b) A heating element connected across a battery of 100 V having an internal resistance of $1 \Omega$ draws an initial current of 10 A at room temperature 20.0 °C which settles after a few seconds to a steady value. What is the power consumed by battery itself after the steady temperature of 320.0 °C is attained? Temperature coefficient of resistance averaged over the temperature range involved is $3.70 \times 10^{-4}{ }^{\circ} C ^{-1}$.
(II) A compound microscope consists of an objective lens of focal length 2.0 cm and an eyepiece of focal length 6.25 cm separated by a distance of 15 cm. How far from the objective should an object be placed in order to obtain the final image at
(a) the least distance of distinct vision (25 cm) and
(b) infinity? What is the magnifying power of the microscope in each case?
(a) the least distance of distinct vision (25 cm) and
(b) infinity? What is the magnifying power of the microscope in each case?
(I) (a) A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece of focal length 1.0 cm is used, what is angular magnification of the telescope in normal adjustment?
(b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is $3.48 \times 10^6 m$ and the radius of lunar orbit is $3.8 \times 10^8 m$.
View full solution →(b) If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is $3.48 \times 10^6 m$ and the radius of lunar orbit is $3.8 \times 10^8 m$.
(II) (a) With the help of a diagram, explain the principle of a device which changes a low ac voltage into a high voltage . Deduce the expression for the ratio of secondary voltage to the primary voltage in terms of the ratio of the number of turns of primary and secondary winding. For an ideal transformer, obtain the ratio of primary and secondary currents in terms of the ratio of the voltages in the secondary and primary coils.
(b) Write any two sources of the energy losses which occur in actual transformers.
(c) A step-up transformer converts a low input voltage into a high output voltage. Does it violate law of conservation of energy? Explain.
(b) Write any two sources of the energy losses which occur in actual transformers.
(c) A step-up transformer converts a low input voltage into a high output voltage. Does it violate law of conservation of energy? Explain.
(I) Explain briefly, with the help of a labelled diagram, the basic principle of the working of an a.c. generator. In an a.c. generator, coil of N turns and area A is rotated at an angular velocity ω in a uniform magnetic field B. Derive an expression for the instantaneous value of the emf induced in coil. What is the source of energy generation in this device?
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