PHYSICS TEST-GRADE XII

PHYSICS TEST GRADE -XII If two glass rods rubbed with wool or silk cloth are brought close to each other, they _____each other. Attract Bind Repel All the above The process of sharing the charges with the earth is called ____ Grounding Tilting Grinding Tiling The value of the basic unit of charge is _______. 1.602192c 1.602192c 1.602192c 1.602192c For a single charge q, the potential is given by V=_____ The electric field inside the cavity is always zero, this is known as ______ Static electricity Electrostatic force Electrostatic shielding Electromagnetic force The product of K is called the ______of the medium and is denoted by Permeability Permissibility Permittivity None of the above 7. K= is called _____ Dielectric constant Plank’s constant Equilibrium constant Heat constant The_____ is defined as the magnitude of the drift velocity per unit electric field. Mobility Computability Potentiality conductivity Resistors in the higher range are made mostly from _____. Chromium Carbon Aluminium Silicon The resistance R= , where p is called ______. Conductivity Resistivity Permeability Mobility The Light emitted in polar regions during solar flares known as _____in physics Sericulture Aurora Borialis Aquiculture Floriculture The cyclotron frequency = The value of Bohr magneton= 9.27 9.27 9.27 9.27 Lorentz force = The average power supplied to an inductor over one complete cycle is _____. Zero one negative one None of the above The transformation of alternating voltage from one to another from greater or smaller value is done by the device called _____. Conductors Insulators Indicators Transformer The alternating magnetic flux induces _____in the iron core and causes heating. Hysterusis Flux leakage Eddy currents Resistance of the windings According to Cartesian sign convention, all distances measured from the ____ of the mirror or optical centre of the mirror. Pole Centre of curvature Optic centre Focus When a light travels from an optically denser medium to the rarer medium at the interface, it is partly reflected back in to the same medium and partly refracted in to the second medium. This reflection is called ____. Angle of incidence Refractive index Internal reflection none of these The Phenomenon of splitting of light into its constituent colours is known as ____. Dispersion Total internal reflection Refraction Refractive index The standard value for normal vision is taken as _____. 20cm 25cm 18cm 26cm The magnifying power of the simple microscope is given by m= The wavelength of a matter wave = In______ an atom is the spherical cloud of positive charges with electrons embedded in it. Rutherford’s model Thomson’s model Bohr’s model Balmer’s series In modern day circuits many logical gates or circuits are integrated in one single____. This is known as integrated circuits. Diode Capacitor Box Chip SOLUTIONS 1. Repel 2. Grounding 3. 1.602192c 4. V= 5. Electrostatic shielding 6. Permittivity 7. Dielectric constant 8. Mobility 9. Carbon 10. The resistance R= , where p is called resistivity 11. Aurora Boriolis 12. The cyclotron frequency = 13. 9.27 14. Lorentz force= 15. Zero 16. Transformer 17. Eddy currents 18. Pole 19. Internal reflection 20. Dispersion 21. 25cm 22. The magnifying power of the simple microscope is given by m= 23. The wavelength of a matter wave = 24. Thomson’s model 25. Chip