Practice free Measurement (Physics) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Assertion : ‘Light year’ and ‘Wavelength’ both measure distance.
Reason : Both have dimensions of time.
Light year and wavelength both represents the distance, so both has dimension of length not of time.
Assertion : Light year and year, both measure time.
Reason : Because light year is the time that light takes to reach the earth from the sun.
Light year measures distance and year measures time. One light year is the distance traveled by light in one year.
Assertion : Force cannot be added to pressure.
Reason : Because their dimensions are different.
Addition and subtraction can be done between quantities having same dimension.
Assertion : Linear mass density has the dimensions of .
Reason : Because density is always mass per unit volume.
Density is not always mass per unit volume.
Assertion : Rate of flow of a liquid is defined as volume of liquid flowing per second.
Reason : The dimensions of rate of flow are .
Rate of flow of liquid is expressed as the volume of liquid flowing per second and it has dimension
Assertion : Units of Rydberg constant R are m-1
Reason : It follows from Bohr’s formula , where the symbols have their usual meaning.
If both assertion and reason are true and the reason is the correct explanation of the assertion.
Assertion : Parallex method cannot be used for measuring distances of stars more than 100 light years away.
Reason : Because parallex angle reduces so much that it cannot be measured accurately.
As the distance of star increases, the parallax angle decreases, and great degree of accuracy is required for its measurement. Keeping in view the practical limitation in measuring the parallax angle, the maximum distance of a star we can measure is limited to 100 light year.
Assertion : Number of significant figures in 0.005 is one and that in 0.500 is three.
Reason : This is because zeros are not significant.
Since zeros placed to the left of the number are never significant, but zeros placed to right of the number are significant.
Assertion :Out of three measurements l = 0.7 m; l = 0.70 m and l = 0.700 m, the last one is most accurate.
Reason : In every measurement, only the last significant digit is not accurately known.
The last number is most accurate because it has greatest significant figure (3).
Assertion :Mass, length and time are fundamental physical quantities.
Reason : They are independent of each other.
As length, mass and time represent our basic scientific notations, therefore they are called fundamental quantities and they cannot be obtained from each other.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.