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Assertion The unit used for measuring nuclear cross-section is ‘barn’. Reason 1 barn `= 10^(-14)

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: When we change the unit of measurement of a quantity, its numerical value changes. Reason: Smaller the unit of measurement smaller is its numerical

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Assertion: Parallax method is used for measuring distances of nearby stars only. Reason: With increase in the distance of star from earth, the parallactic angle becomes too small to be measured

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Out of two measurements `l = 0.7 m and l = 0.70 m`, the second one is more accurate. Reason: In every measurement, the last digit is not accurately

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Random errors arise due to random and unpredictable fluctuations in experimental conditions. Reason: Random errors occurred due to irregularly with respect to sign and

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Assertion: When a quantity appears with a power n greater than one in an expression, its error contribution to the final result decreases `n` times. Reason: In all mathematical operations, the errors are not additive in

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Special functions such as trigonometric, logarithmic and exponential functions are not dimensionless. Reason: A pure number, ratio of similar physical quantities, such as angle and refractive index, has some

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Assertion: Specific gravity of a fluid is a dimensionless quantity. Reason: It is the ratio of density of fluid to the density of

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Assertion: The method of dimensions analysis cannot validate the exact relationship between physical quantities in any equation. Reason: It does not distinguish between the physical quantities having same

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.A device which is used for measurement of length to an accuracy of about `10^(-3)m`,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.Which of the technique is not used for measuring time

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.The mean length of an object is 5 cm. Which of the following measurements is most

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.If the length of rectangle `l = 10.5 cm,` breadth `b = 2.1 cm` and minimum possible measurement by scale `= 0.1 cm`, then the

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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All engineering phenomena deal with definite and measured quantities and so depend on the making of the measurement. We must be clear and precise in making these measurements. To make a measurement, magnitude of the physical quantity (unknown) is compared.The record of a measurement consists of three parts, i.e. the dimension of the quantity, the unit which represents a standard quantity and a number which is the ratio of the measured quantity to the standard quantity.Age of the universe is about `10^(10)` yr, whereas the mankind has existed for `10^6` yr. For how many seconds would the man have existed,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures. e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.In `4700 m,` significant digits

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures. e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.To determine the number of significant figures,

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures. e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.`5.74 g` of a substance occupies `1.2

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures. e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.Choose the correct

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Normally, the reported result of measurement is a number that includes all digits in the number that are known reliably plus first digit that is uncertain. The digits that are known reliably plus the first uncertain digit are known as significant digits or significant figures. e.g. When a measured distance is reported to be 374.5 m, it has four significant figures 3, 7, 4 and 5. The figures 3, 7, 4 are certain and reliable, while the digit 5 is uncertain. Clearly, the digits beyond the significant digits reported in any result are superfluous.Consider the following rules of significant figures.

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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Maximum absolute error in the sum or difference of two quantities is equal to sum of the absolute error in the individual quantities, i.e.` Z = A + B,` then `± DeltaZ = ± DeltaA ± DeltaB`Maximum fractional error in a product or division of quantities is equal to the sum of fractional errors in the individual quantities `i.e.' 'AB or A/B,` then `(DeltaZ)/Z=+-(DeltaA)/A+(DeltaB)B`Two resistors of resistances `R_1= 100 ± 3Omega and R_2 = 200 ± 4Omega` are connected (a) in series and (b) in parallelThe percentage error in the value of `R_1`

asked Mar 19, 2022 in 11th Physics by varun (6.7k points)

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