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Physical World - Unit and Measurement
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Physical World - Unit and Measurement
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23 Questions

1. If C and R denote capacitance and resistance - thedimensional formula of CR is [1988]
2. Dimensions of resistance in an electrical circuit - interms of dimension of mass M - of length L - of time Tandof current I - would be [2007]
3. The density of material in CGSsystem of units is4g/cm 3In a system of units in which unit of length is 10cm and unit of mass is 100 g - the value of density ofmaterial will be [2011M]
4. Which of the following will have the dimensions oftime? [1996]
5. If the dimensions of a physical quantity are givenby Ma L b Tc - then the physical quantity will be:
6. The dimensional formula for angular momentum is[1988]
7. The dimensional formula for magnetic flux is[1999]
8. In a vernier calliper N divisions of vernier scalecoincides with (N-“ 1) divisions of main scale (in whichlength of one division is 1 mm)The least count of theinstrument should be [1994]
9. The dimensions of universal gravitational constantare [1992 - 2004]
10. Dimensional formula of self inductance is [1989]]
11. The unit of permittivity of free space - Ho is [2004]
12. The density of a cube is measured by measuring itsmass and length of its sidesIf the maximum error in themeasurement of mass and length are 4% and 3%respectively - the maximum error in the measurement ofdensity will be [1996]
13. Which one of the following groups have quantitiesthat do not have the same dimensions? [2000]
14. In a particular system - the unit of length - mass andtime are chosen to be 10 cm - 10 g and 0.1 s respectively.The unit of force in this system will be equivalent to[1994]
15. The dimensional formula for permeability µ isgiven by [1991]
16. Of the following quantities - which one hasdimension different from the remaining three? [1989]
17. P represents radiation pressure - c representsspeed of light and S represents radiation energy strikingunit area per secThe non zero integers x - y - z such thatPx Sy c z is dimensionless are [1992]
18. The force Fon a sphere of radius a moving in amedium with velocity v is given by F= 6SKavThedimensions of Kare [1997]
19. The dimensional formula of torque is [1989]
20. The dimensional formula of pressure is [1990]
21. The percentage errors in the measurement of massand speed are 2% and 3% respectivelyThe error inkinetic energy obtained by measuring mass and speedwill be [1995]
22. Which of the following is a dimensional constant?[1995]
23. The frequency of vibration f of a mass m suspendedfrom a spring of spring constant k is given by a relationof the type f = c m x ky - where c is a dimensionlessconstantThe values of x and y are [1990]

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