Q. In the above question dimensions of b/c are the same as those of Wave velocity Wavelength Wave amplitude Wave frequency Answer: Wave velocity

Q. Unit for a fundamental physical quantity is defined as best of various reference standards the smallest measurable value of the physical quantity defined as average various reference standards reference standard for the physical quantity Answer: reference standard for the physical quantity

Q. One second is defined to be equal to 9192631770 periods of the cesium clock 1650763.73 periods of the cesium clock 652189.63 periods of the krypton clock 1650763.73 periods of the krypton clock Answer: 9192631770 periods of the cesium clock

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

Q. Which of the following physical quantities has different dimensions? Energy Watt hour Momentum Work Answer: Momentum

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

Q. The most suitable instrument for measuring the size of an atom is. Electron microscope Vernier calliper Optical Microscope Screw gauge Answer: Electron microscope

Q. Torr’ is the unit of pressure volume density flux Answer: pressure