30 Questions MCQ Test Physics Class 11 - Test: Units & Measurement - 2
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A new unit of length is chosen such that the speed of light in vacuum is unity. What is the distance between the Sun and the Earth in terms of the new unit if light takes 8 min and 20 s to cover this distance?
Detailed Solution for Test: Units & Measurement - 2 - Question 3
► Time can be converted as t = (8 x 60) + 20s = 500 seconds ► Now speed given= 1 unit
We know speed = Distance / Time
which implies distance = Speed x Time
Hence, the distance becomes 1 x 500 = 500 units.
Measurement of a physical quantity is essentially the:
Detailed Solution for Test: Units & Measurement - 2 - Question 6
The Measurement of a given quantity is essentially an act or result of comparison between a quantity whose magnitude (amount) is unknown, with a similar quantity whose magnitude (amount) is known, the latter quantity being called a Standard.
The mass of a box measured by a grocer’s balance is 2.300 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is the difference in the masses of the pieces to correct significant figures?
Detailed Solution for Test: Units & Measurement - 2 - Question 12
Difference in masses = 20.17 – 20.15 = 0.02 g
In subtraction, the final result should retain as many decimal places as there are in the number with the least decimal places.
Detailed Solution for Test: Units & Measurement - 2 - Question 15
The SI base units and their physical quantities are the metre for measurement of length, the kilogram for mass, the second for time, the ampere for electric current, the kelvin for temperature, the candela for luminous intensity, and the mole for amount of substance.
Detailed Solution for Test: Units & Measurement - 2 - Question 20
Derived units are units which may be expressed in terms of base units by means of mathematical symbols of multiplication and division. Example: the SI derived unit of area is the square metre (m2), and the SI derived unit of density is the kilogram per cubic metre (kg/m3 or kg m-3).
Detailed Solution for Test: Units & Measurement - 2 - Question 23
The joule (symbol J), is a derived unit of energy in the International System of Units.
It is equal to the energy transferred to (or work done on) an object when a force of one newton acts on that object in the direction of its motion through a distance of one metre (1 newton metre or N⋅m).
Detailed Solution for Test: Units & Measurement - 2 - Question 27
Dimensional Analysis (also called Factor-Label Method or the Unit Factor Method) is a problem-solving method that uses the fact that any number or expression can be multiplied by one without changing its value. It is a useful technique.
Another use of dimensional analysis is in checking the correctness of an equation which you have derived after some algebraic manipulation. Even a minor error in algebra can be detected because it will often result in an equation which is dimensionally incorrect.
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