NEET 2013

147 Questions • 180 Minutes • 2013

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The internal resistance of a 2.1 V cell which gives a current of 0.2 A through a resistance of 10 Ω is

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When a proton is released from rest in a room, it starts with an initial acceleration a₀ towards west. When it is projected towards north with a speed v₀ it moves with an initial acceleration 3a₀ towards west. The electric and magnetic fields in the room are

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A current loop in a magnetic field -

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A bar magnet of length l and magnetic dipole moment M is bent in the form of an arc of a circle of radius r subtending an angle of 60° at the centre. The new magnetic dipole moment will be

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A wire loop is rotated in a magnetic field. The frequency of change of direction of the induced e.m.f. is -

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A coil of self-inductance L is connected in series with a bulb B and an AC source. Brightness of the bulb decreases when -

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Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is

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The half-life of a radioactive isotope ‘X’ is 20 years. It decays to another element ‘Y’ which is stable. The two elements ‘X’ and ‘Y’ were found to be in the ratio 1 : 7 in a sample of a given rock. The age of the rock is estimated to be -

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For photoelectric emission from certain metal the cutoff frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)

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The wavelength λe of an electron and λp of a photon of same energy E are related by

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A plano convex lens fits exactly into a plano concave lens. Their plane surfaces are parallel to each other. If lenses are made of different materials of refractive indices μ₁ and μ₂ and R is the radius of curvature of the curved surface of the lenses, then the focal length of the combination is

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For a normal eye, the cornea of eye provides a converging power of 40 D and the least converging power of the eye lens behind the cornea is 20 D. Using this information, the distance between the retina and the cornea-eye lens can be estimated to be

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In Young's double slit experiment, the slits are 2 mm apart and are illuminated by photons of two wavelengths λ₁ = 12000 Å and λ₂ = 10000 Å. At what minimum distance from the common central bright fringe on the screen 2 m from the slit will a bright fringe from one interference pattern coincide with a bright fringe from the other?

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A parallel beam of fast moving electrons is incident normally on a narrow slit. A fluorescent screen is placed at a large distance from the slit. If the speed of the electrons is increased, which of the following statements is correct ?

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In an n-type semiconductor, which of the following statements is true?

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In a common emitter (CE) amplifier having a voltage gain G, the transistor used has transconductance 0.03 mho and current gain 25. If the above transistor is replaced with another one with transconductance 0.02 mho and current gain 20, the voltage gain will be

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The value of Planck's constant is 6.63 × 10⁻³⁴ J s. The speed of light is 3 × 10¹⁷ nm s⁻¹. Which value is closest to the wavelength in nanometre of a quantum of light with frequency of 6 × 10¹⁵ s⁻¹?

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What is the maximum number of electrons that can be associated with the following set of quantum numbers? n = 3, l = 1 and m = −1.

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What is the activation energy for a reaction if its rate doubles when the temperature is raised from 20°C to 35°C? (R = 8.314 J mol⁻¹ K⁻¹)

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A hydrogen gas electrode is made by dipping platinum wire in a solution of HCl of pH = 10 and by passing hydrogen gas around the platinum wire at one atm pressure. The oxidation potential of electrode would be

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Paper Info

Exam: NEET
Year: 2013
Questions: 147
Duration: 180 mins

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