# NCERT Class 11 Physics Solutions Units and Measurements

NCERT Class 11 Physics Solutions Units and Measurements with answers available in Pdf for free download. The NCERT Solutions for Class 11 Physics with answers have been prepared as per the latest syllabus, NCERT books and examination pattern suggested in Standard 11 by CBSE, NCERT and KVS. Solutions to questions given in NCERT book for Class 11 Physics are an important part of exams for Grade 11 Physics and if practiced properly can help you to get higher marks. Refer to more Chapter-wise Solutions for NCERT Class 11 Physics and also download more latest study material for all subjects

## Units and Measurements Class 11 NCERT Solutions

Class 11 Physics students should refer to the following NCERT questions with answers for Units and Measurements in standard 11. These NCERT Solutions with answers for Grade 11 Physics will come in exams and help you to score good marks

### Units and Measurements NCERT Solutions Class 11

NCERT Class 11 Physics Solutions Units & Measurements - NCERT Solutions prepared for CBSE students by the best teachers in Delhi.

Class XI Physics

Ch. 2: UNITS & Measurements

NCERT Solutions

Question 2.1: Fill in the blanks

(a) The volume of a cube of side 1 cm is equal to.....m3

(b) The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to ... (mm)2

(c) A vehicle moving with a speed of 18 km h–1covers....m in 1 s

(d) The relative density of lead is 11.3. Its density is ....g cm–3or . ...kg m–3.

Question 2.2: Fill in the blanks by suitable conversion of units:

(a) 1 kg m2s–2= ....g cm2 s–2

(b) 1 m =..... ly

(c) 3.0 m s–2=.... km h–2

(d) G= 6.67 × 10–11 N m2 (kg)–2=.... (cm)3s–2 g–1.

QUESTION 2.3 A calorie is a unit of heat or energy and it equals about 4.2 J where 1J = 1 kg m2s–2.Suppose we employ a system of units in which the unit of mass equals α kg, the unit of length equals β m, the unit of time is γ s. Show that a calorie has a magnitude 4.2 α–1 β–2 γ2 in terms of the new units.

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Question 2.4: Explain this statement clearly:

“To call a dimensional quantity ‘large’ or ‘small’ is meaningless without specifying a standard for comparison”. In view of this, reframe the following statements wherever necessary:

(a) atoms are very small objects

(b) a jet plane moves with great speed

(c) the mass of Jupiter is very large

(d) the air inside this room contains a large number of molecules

(e) a proton is much more massive than an electron

(f) the speed of sound is much smaller than the speed of light.

Question 2.5: 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?

Question 2.6: Which of the following is the most precise device for measuring length:

(a) a vernier callipers with 20 divisions on the sliding scale

(b) a screw gauge of pitch 1 mm and 100 divisions on the circular scale

(c) an optical instrument that can measure length to within a wavelength of light ?

Question 2.7: A student measures the thickness of a human hair by looking at it through a microscope of magnification 100. He makes 20 observations and finds that the average width of the hair in the field of view of the microscope is 3.5 mm. What is the estimate on the thickness of hair?

Question 2.8: Answer the following:

(a) You are given a thread and a metre scale. How will you estimate the diameter of the thread?

(b) A screw gauge has a pitch of 1.0 mm and 200 divisions on the circular scale. Do you think it is possible to increase the accuracy of the screw gauge arbitrarily by increasing the number of divisions on the circular scale?

(c) The mean diameter of a thin brass rod is to be measured by vernier callipers. Why is a set of 100 measurements of the diameter expected to yield a more reliable estimate than a set of 5 measurements only?

Question 2.9: The photograph of a house occupies an area of 1.75 cm2on a 35 mm slide. The slide is projected on to a screen, and the area of the house on the screen is 1.55 m2. What is the linear magnification of the projector-screen arrangement?

Question 2.10: State the number of significant figures in the following:

(a) 0.007 m2

(b) 2.64 × 1024 kg

(c) 0.2370 g cm–3

(d) 6.320 J

(e) 6.032 N m–2

(f) 0.0006032 m2

Students should free download the NCERT solutions and get better marks in exams. Studiestoday.com panel of teachers recommend students to practice questions in NCERT books and download NCERT solutions.

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