Class 11: Physics Chapter 1 solutions. Complete Class 11 Physics Chapter 1 Notes.
Contents
Maharashtra Board Solutions Class 11-Physics: Chapter 1- Units and Measurements
Maharashtra Board 11th Physics Chapter 1, Class 11 Physics Chapter 1 solutions
1. Choose the correct option.
Question 1.
[L1M1T-2] is the dimensional formula for
(A) Velocity
(B) Acceleration
(C) Force
(D) Work
Answer:
(C) Force
Question 2.
The error in the measurement of the sides of a rectangle is 1%. The error in the measurement of its area is
(A) 1%
(B) 12%
(C) 2%
(D) None of the above.
Answer:
(C) 2%
Question 3.
Light year is a unit of
(A) Time
(B) Mass
(C) Distance
(D) Luminosity
Answer:
(C) Distance
Question 4.
Dimensions of kinetic energy are the same as that of
(A) Force
(B) Acceleration
(C) Work
(D) Pressure
Answer:
(C) Work
Question 5.
Which of the following is not a fundamental unit?
(A) cm
(B) kg
(C) centigrade
(D) volt
Answer:
(D) volt
2. Answer the following questions.
Question 1.
Star A is farther than star B. Which star will have a large parallax angle?
Answer:
i). ‘b’ is constant for the two stars
∴ θ ∝ 1D
ii) As star A is farther i.e., DA > DB
⇒ θA < θB
Hence, star B will have larger parallax angle than star A.
V =4.234 × 1.005 × 0.0201
= antilog [log (4.234) + log (1.005) + log (0.0201)]
= antilog [0.6269 – 0.0021 – 2¯¯¯.3032]
= antilog [0.6288 – 2¯¯¯.3032]
= antilog [ 2 .9320]
= 8.551 × 10-2
= 0.08551 m3
In correct significant figure (rounding off),
V = 0.086 m3
i.) Area of sheet to correct significant figures is 8.72 m2.
ii) Volume of sheet to correct significant figures is 0.086 m3.
[Note: The given solution is arrived to by considering a rectangular sheet.]
Question 12.
If the length of a cylinder is l = (4.00 ± 0.001) cm, radius r = (0.0250 ± 0.001) cm and mass m = (6.25 ± 0.01) gm. Calculate the percentage error in the determination of density.
Answer:
Given: l = (4.00 ± 0.001) cm,
In order to have same precision, we use, (4.000 ± 0.001),
r = (0.0250 ± 0.00 1) cm,
In order to have same precision, we use, (0.025 ± 0.001)
m = (6.25 ± 0.01) g
To find: percentage error in density
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Maharashtra Board Solutions Class 11-Physics: Chapter 1- Units and Measurements
Download PDF: Maharashtra Board Solutions Class 11-Physics: Chapter 1- Units and Measurements PDF
Chapterwise Maharashtra Board Solutions Class 11 Physics :
- Chapter 1- Units and Measurements
- Chapter 2- Mathematical Methods
- Chapter 3- Motion in a Plane
- Chapter 4- Laws of Motion
- Chapter 5- Gravitation
- Chapter 6- Mechanical Properties of Solids
- Chapter 7- Thermal Properties of Matter
- Chapter 8- Sound
- Chapter 9- Optics
- Chapter 10- Electrostatics
- Chapter 11- Electric Current Through Conductors
- Chapter 12- Magnetism
- Chapter 13- Electromagnetic Waves and Communication System
- Chapter 14- Semiconductors
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