Q9. In a system of units if force (F), acceleration (A) and time (T) are taken as fundamentals units then the dimensional formula of energy is FA2T FAT2 FA2T FAT Answer: FAT2
Q. Which of the following is a dimensional constant? Gravitational constant Dielectric constant Refractive index Relative density Answer: Gravitational constant
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Q. Which of the following physical quantities has different dimensions? Energy Watt hour Momentum Work Answer: Momentum
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Q. Two physical quantities whose dimensions are not same, cannot be multiplied with each other divided added or substracted in the same expression added together Answer: added or substracted in the same expression
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Q. The most suitable instrument for measuring the size of an atom is. Electron microscope Vernier calliper Optical Microscope Screw gauge Answer: Electron microscope
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Q.14. The numbers 5.355 and 5.345 on rounding off to 3 significant figures will give 5.35 and5.34 5.36 and5.35 5.35 and5.35 5.36 and5.34 Answer: 5.36 and5.34
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Q. The respective number of significant figures for the numbers 23.023, 0.0003 and 2.1×10-3 are 5, 1, 2 5, 1, 5 5, 5, 2 4, 4, 2 Answer: 5, 1, 2
Q. Which two of the following five physical parameters have the same dimensions? I. Energy density II. Refractive index III. Dielectric constant IV. Young’s modulus V. Magnetic field I and IV III and V I and II I and V Answer: I and IV
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Q. The length, breadth and height of a rectangular block of wood were measured to be l = 12.13 ± 0.02 cm, b = 8.16 ± 0.01cm and h = 3.46 ± 0.01cm. 0.88% 0.58% 0.78% 0.68% Answer: 0.58%
