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Which of the following measurement is more precise?

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Important Questions on Units and Measurements

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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 3
If the random error in the arithmetic mean of 50 observations is α, then the random error in the arithmetic mean of 150 observations would be
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 4
If momentum of an object is increased by 10% then its kinetic energy will increase by
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 5
Three measurements are made as 18.425 cm, 7.21 cm and 5.00 cm. The addition should be written as: 
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 6
If x=10.0±0.1 and y=10.0±0.1, then 2 x-2 y is equal to
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 7
The diameter of a wire is measured to be 0.0205×10-4 m. The number of significant figures in the measurement is
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 10
The length of a uniform rod is 100.0 cm and radius is 1.00 cm. If length is measured with a meter rod having least count 1 mm and radius is measured with vernier calipers having least count 0.1 mm, the percentage error in calculated volume of cylinder is
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 11
The value of (1003)1/3 according to binomial theorem is
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Gamma Question Bank for Medical Physics>Chapter 2 - Units and Measurements>EXERCISE>Q 12
The value of (997)13 according to binomial theorem is