Physics (Ancient Greek: φύσις physis “nature”) is a natural science that involves the study of matter and its motion through space-time, as well as all applicable concepts, such as energy and force. More broadly, it is the general analysis of nature, conducted in order to understand how the universe behaves.

Syllabus ( Class XI – PHYSICS):

• Chapter 1: Physical World
• Chapter 2: Units And Measurement

NOTE: Please read the above chapters thoroughly before attempting the given questions. You  are not expected to cheat in the paper as solving the paper will increase your logical & analytical reasoning quest.

Question 1. Choose the correct answer from the given options:-

a) Which of the following is not a unit of mass?

1) kgf                            2) metric tonne

3) Quintal                   4) Atomic Mass Unit

b) Parsec is the unit of :

1) Time                       2) Distance

3) Angular acceleration 4)  Trigonometric Ratio

5) Frequency           6) Acceleration

c) The dimensions of universal gravitational constants are :-

(1) [M^-1L³T^-2]
(2) [M L ² T ^-1 ]
(3) [M^-2L³T^-2]
(4) [M ^-2 L ² T ^-1 ]

d) Which of the following pairs have same dimensions?
(1) Light Year & Wavelength
(2) Energy & Young’s Modulus
(3) Torque and Work
(4) Angular momentum and work

Q.2. What is the advantage of choosing the wavelength of light radiation as a standard of length?
Q.3. When velocity of light is taken as the unit of velocity and a year is taken as the unit of time, determine the unit of length, what is its name?
Q.4. Check the dimensional consistency of the equation.
Fs = 1 / 2 m v² – 1 / 2 m u²
Q.5. A. Derive the expression for the propagation of errors when the result involves the product of some powers of the measured quantities.
B. Write any two limitations of dimensional analysis.
Q.6. When the observations are taken at an interval of 6 months, the angle of parallax for a star is 0.4″. Find the distance of the star in parsec.
Q.7. Write a short note on the range of time which we can measure and methods of measurement of time.
Q.8. Differentiate between Precision And Accuracy with a proper example.
———-SOLUTION TO BE GIVEN IN NEXT POST——————-

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