Physics

Physics Section 15 The direction of an electric field is the direction of the force a positive test charge would experience. The electric field inside a charged conductor is zero. The capacitance of a parallel plate capacitor increases with the plate area. The SI unit of capacitance is the farad (F). Dielectric materials increase the […]

Physics Section 9 Vestigial structures are remnants of ancestral traits that have lost their original function. Speciation is the process by which new species arise from existing ones due to isolation and genetic divergence. Adaptive radiation is the diversification of a single ancestral species into a variety of ecological niches. Biotic factors are living components

Physics Section 14 An immersion heater of 400 watts kept on for 5 hours will consume electrical power of 2 kWh. Resistance of an ideal insulator is infinite. Reciprocal of resistivity is called conductivity. Circuit which gives continuously varying potential is called potential divider. The bulb with the thickest filament among 60W, 100W, and 200W

Physics Section 13 Area under velocity-time graph represents displacement. Instantaneous and average velocities become equal when the body has uniform acceleration. Inertia of an object is a quantitative measure of its mass. The 1st law of motion gives the definition of rest. The 3rd law of motion explains the existence of a pair of forces

Physics Section 12 Forward current in a semiconductor diode circuit is due to majority carriers. The donor impurity among the options is antimony. The arrow in the transistor schematic symbol is located on the emitter. In full wave rectification, the output D.C. voltage across the load is obtained for the complete cycle of input A.C.

Physics Section 11 When monochromatic light is incident on a metal surface, doubling the intensity of the incident light while keeping the wavelength the same will cause the kinetic energy of emitted electrons to remain the same. Increasing the wavelength of incident radiation in photoemission results in a decrease in the average kinetic energy of

Physics Section 10 The dimensions of the coefficient of viscosity are ML^-1T^-1. Terminal velocity is both uniform and maximum. When the body moves with terminal velocity, the acceleration in the body becomes 0. Terminal velocity is given by the equation Vt = 2gr^2/9ρ. Terminal velocity of the body is directly proportional to the square of

Physics Section 8 Electromagnetic waves transport energy. Electromagnetic waves emitted from an antenna are transverse. Time taken for the potential difference across the capacitor to reach 300V is 0.9 seconds. The r.m.s value of an alternating current is represented by the square root of the mean value of I^2. An alternating current of frequency and

Physics Section 7 The wavelength of a sound wave is the distance between two consecutive compressions or rarefactions. The speed of sound in a medium depends on the properties of the medium, such as its density and elasticity. The Doppler effect causes a shift in the frequency of a sound wave when the source of

Physics Section 6 The building blocks of proteins are amino acids. DNA and RNA are nucleic acids responsible for the storage and transmission of genetic information. Enzymes are biological catalysts that speed up chemical reactions in living organisms. The cell is the basic structural and functional unit of all living organisms. Prokaryotic cells lack a