SECTION – 1 : (Maximum Marks : 32)

INFORMATION

This section contains EIGHT questions and the answer to each question is a SINGLE DIGIT INTEGER ranging from 0 to 9.

Question

An infinitely long uniform line charge distribution of charge per unit length λ lies parallel to the y-axis in the y-z plane at a (see figure). If the magnitude of the flux of the electric field through the rectangular surface ABCD lying the x-y plane with its centre at the origins is (ε₀ = permittivity of free space), then the value of n is :

Consider a hydrogen atom with its electron in the nth orbital. An electromagnetic radiation of wavelength 90 nm is used to ionize the atom. If the kinetic energy of the ejected electron is 10.4 eV, then the value of n is (hc = 1242 eV nm)

A Bullet is fired vertically upwards with velocity v from the surface of a spherical planet. When it reaches its maximum height, its acceleration due to the planet’s gravity is 1/4th of its value at the surface of the planet. If the escape velocity from the planet is v_esc = v√n, then the value of N is (ignore energy loss due to atmosphere)

Two identical uniform discs roll without slipping on two different surfaces AB and CD (see figure) starting at A and C with linear speeds v₁ and v₂, respectively, and always remain in contact with ths surfaces. If they reach B and D with the same linear speed and v₁ = 3 m/s, then v₂ in m/s is (g = 10 m/s²)

Two spherical stars A and B emit blackbody radiation. The radius of A is 400 times that of B and A emits 10⁴ times the power emitted from B. The ratio of their wavelengths λ_A and λ_B at which the peaks occur in their respective radiation curves is :

A nuclear power planet supplying electrical power to a village uses a radioactive material of half life T years as the fuel. The amount of fuel at the beginning is such that the total power requirement of the village is 12.5% of the electrical power available from the plant at that time. If the plant is able to meet the total power needs of the village for a maximum period of nT years, then the value of n is.

A young’s double slit interference arrangement with slits S₁ and S₂ is immersed in water (refractive index = 4/3) as shown in the figure. The positions of maxima on the surface of water are given by X² = p²m²λ² – d², where λ is the wavelengths of light in air (refractive index = 1), 2d is separation between the slits and m is an integer. The value of p is

Consider a concave mirror and a convex lens (refractive index = 1.5) of focal length 10 cm each, separated by a distance of 50 cm in air (refractive index =1) as shown in the figure. An object is placed at a distance of 15 cm from the mirror. Its erect image formed by this combination has magnification M₁. When the set-up is kept in a medium of refractive index 7/6, the magnification becomes M₂. The magnitude

SECTION – 2 : (Maximum Marks : 40)

This section contains TEN questions

Each question has FOUR options (A), (B), (C) and (D). ONE OR MORE THAN ONE of these four option(s) is(are) correct

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Question:

Consider a vernier callipers in which each 1 cm on the main scale is divided into 8 equal divisions and a screw gauge with 100 divisions on its circular scale. In the vernier callipers, 5 divisions of the vernier scale coincide with 4 division on the main scale and in the screw gauge, one complete rotation of the circular scale moves it by two divisions on the linear scale. Then,

Planck’s constant h, speed of light c and gravitational constant G are used to from a unit of length L and a unit of mass M. Then the correct options(s) is (are)

Two independent harmonic oscillators of equal mass are oscillating about the origin with angular frequencies ω₁ and ω₂ and have total energies E₁ and E₂, respectively. The variations of their momenta p with positions x are shown in figures. If then the correct equation(s) is (are) :

A ring of mass M and radius R is rotating with angular speed ω about a fixed vertical axis passing through its centre O with two pint masses each of mass M/8 at rest at O. These masses can move radially outwards along two massless rods fixed on the ring as shown in the figure. At some instant the angular speed of the system is and one of the masses is at a distance of from O. At this instant the distance of the other mass from O is :

The figures below depict two situations in which two infinitely long static line charges of constant positive line charge density λ are kept parallel to each other. In their resulting electric field, point charges q and –q are kept in equilibrium between them. The point charges are confined to move in the x-direction only. If they are given a small displacement about their equilibrium positions, then the correct statement(s) is (are) :

Two identical glass rods S₁ and S₂ (refractive index = 1.5) have one convex end of radius of curvature 10 cm. They are placed with the curved surfaces at a distance d as shown in the figure, with their axes (shown by the dashed line) aligned. When a point source of light P is placed inside rod S1 on its axis at a distance of 50 cm from the curved face, the light rays emanating from it are found to be parallel to the axis inside S₂. The distance d is :

A conductor (shown in the figure) carrying contact current I is kept in the x-y plane in a uniform magnetic field . IF F is the magnitude of the total magnetic force acting on the conductor, then the correct statement(s) is (are) :

A container of fixed volume has a mixture of one mole of hydrogen and one mole of helium in equilibrium at temperature T. Assuming the gases are ideal, the correct statement(s) is (are)

In an aluminum (Al) bar of square cross section, a square hole is drilled and is filled with iron (Fe) as shown in the figure, The electrical resistivities of Al and Fe are 2.7× 10^–8 Ω m and 1.0 × 10^–7 Ω m, respectively. The electrical resistance between the two faces P and Q of the composite bar is

For photo-electric effect with incident photon wavelength λ₁ the stopping potential is V₀. Identify the correct variation(s) of V₀ with λ and 1/λ.

SECTION – 3 : (Maximum Marks : 16)

This section contains TWO questions

Each question contains two columns, Column I and Column II

Column I has four entries (A),(B), (C) and (D)

Column II has five entries (P),(Q), (R), (S) and (T)

Match the entries in Column I with the entries in Column II

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             Column-I                                   Column-II

(A) Nuclear fusion                            (P) Absorption of thermal neutrons by

(B) Fission in a nuclear reactor     (Q) nucleus

(C) β-decay                                      (R) Energy production in stars via hydrogen conversion to helium

(D) γ-ray emission                           (S) Heavy water

                                                           (T) Neutrino emission

A particle of unit mass is moving along the x–axis under the influence of a force and its total energy is conserved. Four possible forms of the potential energy of the particle are given in column I (a and U₀ are constants). Match the potential energies in column I to the corresponding statement(s) in column II.