45 Questions MCQ Test NEET Mock Test Series | Test: Physics - 9
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The resolution limit of the eye is 1 minute. At a distance of X km from the eye, two persons stand with a lateral separation of 3 meters. For the two persons to be just resolved by the naked eye, X should be
In Young's double slit experiment, the fringe width is found to be 0.4 mm. If the whole apparatus is immersed in water of refractive index 4/3 without disturbing the geometrical arrangement, the new fringe width will be
A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter equal to (3/4)th the angle of the prism. The angle of deviation will be
A point object O is placed on the principal axis of a convex lens of focal length 20 cm at a distance of 40cm to the left of it. The diameter of the lens is 10 cm. If the eye is placed 60 cm to the right of the lens at a distance h below the principal axis, then the maximum value of h to see the image will be
In a compound microscope, the focal lengths of two lenses are 1.5 cm and 6.25 cm. If an object is placed at 2cm from objective and the final image is formed at 25cm from eye lens, the distance between the two lenses is
Angle of a prism is A and its one surface is slivered.Light rays falling at an angle of incidence 2 A on first surface returns back, through, the same path after suffering reflection at the second silvered surface.Refractive index of material is
When a beam of accelerated electrons hit a target a continuous X-ray spectrum is emitted from the target.Which one of these wavelengths is absent in the X-ray spectrum if the X-rays tube is operated at 40,000V ?
Light of two different frequencies whose photons have energies 1 and 2.5 eV respectively, successively illuminate a metal whose work function is 0.5 eV. The ratio of the maximum speeds of the emitted electrons will be
In a photoelectric experiment, photons of energy 4.8eV are incident on a metal surface. They liberate electrons which are just 'stopped' by an electrode at a potential of -3.3 volt with respect to the metal. The work function of the metal surface in electron volt is
A freshly prepared radioactive source of half life 2 hrs emits radiations of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
A gamma ray photon creates an electron positron pair. If the rest mass energy of an electron is 0.5 MeV and the total kinetic energy of the electron positron pair is 0.5 MeV, then the energy of the gamma ray photon must be
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