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A physical quantity ' Y is represented by formula Y=AxByCz. If maximum possible percentage errors in A, B and C respectively are a%,b% and c% then final maximum possible error is

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Important Questions on Physical World, Units and Measurement

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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 36
If the error in measurement of momentum of a particle is 10% and mass is known exactly, the permissible error in the determination of kinetic energy is
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 37
The time taken by a vehicle to go from one station to the other is 100 s. It is recorded with a stop watch having the least count 1 s. How many significant figures are there in the value of time 100 s?
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 39
The kinetic energy of a particle depends on the square of speed of the particle. If error in measurement of speed is 30%, the error in the measurement of kinetic energy will be n%. The value of n is _____.
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 40
To determine the Young's modulus of a wire, the formula is Y=FA×LΔL where L= length; A= area of cross-section of the wire, ΔL=change in length of the wire when stretched with a force F. The conversion factor to change it from CGS to MKS system is n. The value of n is
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 41
The least count of a stopwatch is 0.2 s. The time of 20 oscillations of a pendulum is measured to be 25 s. The percentage error in the measurement of time will be
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 42
A wire has a mass (0.3±0.003)g, radius (0.5±0.005)mm and length (6±0.06)cm. The maximum percentage error in measurement of density is n. The value of n is _____.
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 43
The percentage error in measurement of a physical quantity m, given by m=πtanθ, is minimum when θ=n°. The value of n is _____.
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Gamma Question Bank for Engineering Physics>Chapter 1 - Physical World, Units and Measurement>Assignment>Q 44
The number of significant figures in (3.20+4.80) ×105 is _____.