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1 If P is the momentum of an object of mass m, then the expression (P^2/2m) has base units identical to
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Energy
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Force
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Power
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Velocity
Correct!Wrong!Energy
As E=P^2/2m (where E is energy)
which shows that given expression is equal to energy so it has identical units to energy.
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2 By increasing the number of measurements in an experiment, the error in the measurements?
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Increases
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Decreases
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Remain same
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None of these
Correct!Wrong!Decreases
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3 The least count of an instrument is 0.01 cm. Taking all precautions, the most possible error in the measurement can be
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0.02 cm
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0.01 cm
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0.005 cm
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0.001 cm
Correct!Wrong!0.01 cm
As
Absolute uncertainty=least count
So most possible error is equal to least count.
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4 The length of is measured with a rod calibrated in millimeters. Which of the following is the correct expression for length, keeping in view the experimental error.
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(20.0 - 0.5) cm to (20.0 + 0.5) cm
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(20.0 - 0.05) cm to (20.0 + 0.05) cm
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(20.0 - 0.1) cm to (20.0 + 0.1) cm
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(20.0 - 0.01) cm to (20.0 + 0.01) cm
Correct!Wrong!(20.0 - 0.1) cm to (20.0 + 0.1) cm
As
Absolute uncertainty=least count=1 mm=0.1 cm
So, measurement with possible uncertainty (error) can be written as (20.0 - 0.1) cm to (20.0 + 0.1) cm
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5 Error in measurement of radius is 1%. The error in calculated value of volume of sphere will be?
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1%
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5%
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7%
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3%
Correct!Wrong!
3%
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6 In multiplication and division of measurement,
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Percentage uncertainties are added up
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Absolute uncertainties are added up
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Percentage uncertainties are divided
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Absolute uncertainties are divided
Correct!Wrong!Percentage uncertainties are added up
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7 Zero error is the example of
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Personal error
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Random error
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Systematic error
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None of these
Correct!Wrong!Systematic error
Zero error can be present due to faults in measuring instrument, so it is Systematic error.
Poor calibration is also referred as Systematic error.
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8 The diameter of a cylinder is measured with vernier callipers having least count of 0.01 cm. The diameter is 1.95 cm. The radius of cylinder to the correct significant figures will be:
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0.975 cm
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0.97 cm
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0.9 cm
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None of these
Correct!Wrong!
The correct answer is 0.98 cm.
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9 The unit of energy is _____ and its symbol is:
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Joule , j
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Joule , J
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joule , j
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None of these
Correct!Wrong!The correct answer is ( joule , J )
Full name of unit does not begin with a capital letter even it us named after a scientist, so we write joule in units with first letter small.
And as it is named after a scientist so its symbol is written in capital letter i.e. J .
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10 The angular frequency is measured in radian per seconds ( rad s^-1) . Its dimensions in length are:
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-2
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-1
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1
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0
Correct!Wrong!0
As radian is dimensionless quantity so angular frequency has no dimensions in length.
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PHYSICS XI Ch#1 Quiz 2
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