NEET 2014

166 Questions • 180 Minutes • 2014

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Certain quantity of water cools from 70°C to 60°C in the first 5 minutes and to 54°C in the next 5 minutes. The temperature of the surroundings is :

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A monoatomic gas at pressure P, having a volume V expands isothermally to a volume 2V and then adiabatically to a volume 16 V. The final pressure of the gas is : (take γ = 5/3)

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The mean free path of molecules of a gas, (radius r) is inversely proportional to :

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If $n_1$, $n_2$ and $n_3$ are the fundamental frequencies of three segments into which a string is divided, the original fundamental frequency n of the string is given by :

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The number of possible natural oscillations of air column in a pipe closed at one end of length 85 cm whose frequencies lie below 1250 Hz are : (velocity of sound = 340 $ms^{-1}$)

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A speeding motorcyclist sees traffic jam ahead of him. He slows down to 36 km/hour. He finds the traffic has eased and a car moving ahead of him at 18 km/hour is honking at a frequency of 1392 Hz. The speed of sound is 343 m/s, the frequency of the honk as heard by him will be :

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A conducting sphere of radius R is given a charge Q. The electric potential and the electric field at the centre of the sphere respectively are :

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In a region the potential is represented by V(x, y, z) = 6x – 8xy – 8y + 6yz, where V is in volts and x, y, z are in meters. The electric force experienced by a charge of 2 coulomb situated at point (1, 1, 1) is :

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Two cities are 150 km apart. Electric power is sent from one city to another city through copper wires. The fall of potential per km is 8 volt and the average resistance per km is 0.5 Ω. The power loss in the wire is :

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A potentiometer circuit has been set up for finding the internal resistance of a given cell. The main battery, used across the potentiometer wire, has an emf of 2.0 V and a negligible internal resistance. The potentiometer wire itself is 4 m long. When the resistance R, connected across the given cell, has values of (i) infinity (ii) 9.5 Ω, the 'balancing lengths' on the potentiometer wire are found to be 3 m and 2.85 m, respectively. The value of internal resistance of the cell is :

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In an ammeter 0.2% of main current passes through the galvanometer. If resistance of galvanometer is G, the resistance of ammeter will be :

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Two identical long conducting wires AOB and COD are placed at right angle to each other, with one above other such that 'O' is their common point for the two. The wires carry $I_1$ and $I_2$ currents, respectively. Point 'P' is lying at distance 'd' from 'O' along a direction perpendicular to the plane containing the wires. The magnetic field at the point 'P' will be :

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A transformer having efficiency of 90% is working on 200 V and 3 kW power supply. If the current in the secondary coil is 6 A, the voltage across the secondary coil and the current in the primary coil respectively are :

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Light with an energy flux of $25 \times 10^4$ $Wm^{-2}$ falls on a perfectly reflecting surface at normal incidence. If the surface area is 15 $cm^2$, the average force exerted on the surface is :

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A beam of light of λ = 600 nm from a distant source falls on a single slit 1 mm wide and the resulting diffraction pattern is observed on a screen 2 m away. The distance between first dark fringes on either side of the central bright fringe is :

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In the Young's double-slit experiment, the intensity of light at a point on the screen where the path difference is λ is K, (λ being the wave length of light used). The intensity at a point where the path difference is λ/4 will be :

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If the focal length of objective lens is increased then magnifying power of :

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The angle of prism is 'A'. One of its refracting surfaces is silvered. Light rays falling at an angle of incidence 2A on the first surface return back through the same path after suffering reflection at the silvered surface. The refractive index μ of the prism is :

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When the energy of the incident radiation is increased by 20% the kinetic energy of the photoelectrons emitted from a metal surface increased from 0.5 eV to 0.8 eV. The work function of the metal is :

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If the kinetic energy of the particle is increased to 16 times its previous value, the percentage change in the de-Broglie wavelength of the particle is :

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Paper Info

Exam: NEET
Year: 2014
Questions: 166
Duration: 180 mins

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