Tamil Nadu Board of Secondary EducationHSC Science Class 11th

# Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide chapter 1 - Nature of Physical World and Measurement [Latest edition]

## Chapter 1: Nature of Physical World and Measurement

Evaluation
Evaluation [Pages 37 - 38]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide Chapter 1 Nature of Physical World and MeasurementEvaluation [Pages 37 - 38]

#### Multiple Choice Questions

Evaluation | Q I. 1. | Page 37

One of the combinations from the fundamental physical constants is "hc"/"G". The unit of this expression is ______

• kg2

• m3

• s-1

• m

Evaluation | Q I. 2. | Page 37

If the error in the measurement of the radius is 2%, then the error in the determination of the volume of the sphere will be ______

• 8%

• 2%

• 4%

• 6%

Evaluation | Q I. 3. | Page 37

If the length and time period of an oscillating pendulum have errors of 1% and 3% respectively then the error in measurement of the acceleration due to gravity is ______

• 4%

• 5%

• 6%

• 7%

Evaluation | Q I. 4. | Page 37

The length of a body is measured as 3.51 m, if the accuracy is 0.01m, then the percentage error in the measurement is ______

• 351%

• 1%

• 0.28%

• 0.035%

Evaluation | Q I. 5. | Page 37

Which of the following has the highest number of significant figures?

• 0.007 m2

• 2.64 × 1024 kg

• 0.0006032 m2

• 6.3200 J

Evaluation | Q I. 6. | Page 37

If π = 3.14, then the value of π2 is ______

• 9.8596

• 9.860

• 9.86

• 9.9

Evaluation | Q I. 7. | Page 37

Which of the following pairs of physical quantities have the same dimension?

• force and power

• torque and energy

• torque and power

• force and torque

Evaluation | Q I. 8. | Page 37

The dimensional formula of Planck's constant h is ______

• [ML2 T-1]

• [ML2T-3]

• [MLT-1]

• [ML3T-3]

Evaluation | Q I. 9. | Page 37

The velocity of a particle v at an instant t is given by v = at + bt2. The dimensions of b are ______

• [L]

• [LT-1]

• [LT-2]

• [LT-3]

Evaluation | Q I. 10. | Page 37

The dimensional formula for gravitational constant G is ______

• [ML3T-2]

• [M-1L3T-2]

• [M-1L-3T-2]

• [ML-3T2]

Evaluation | Q I. 11. | Page 37

The density of a material in the CGS system of units is 4 g cm-3. In a system of units in which the unit of length is 10 cm and unit of mass is 100 g, then the value of density of the material will be ______

• 0.04

• 0.4

• 40

• 400

Evaluation | Q I. 12. | Page 37

If the force is proportional to the square of velocity, then the dimension of the proportionality constant is ______

• [MLT0]

• [MLT-1]

• [ML-2T]

• [ML-1T0]

Evaluation | Q I. 13. | Page 38

The dimension of (mu_0ε_0)^{1/2} is ______

• length

• time

• velocity

• force

Evaluation | Q I. 14. | Page 38

Planck’s constant (h), speed of light in vacuum (c), and Newton’s gravitational constant (G) are taken as three fundamental constants. Which of the following combinations of these has the dimension of length?.

• sqrt(hG)/c^{3/2}

• sqrt(hG)/c^{5/2}

• sqrt((hc)/G)

• sqrt((Gc)/h^{3/2})

Evaluation | Q I. 15. | Page 38

A length-scale (l) depends on the permittivity (ε) of a dielectric material, Boltzmann constant (kB), the absolute temperature (T), the number per unit volume (n) of certain charged particles, and the charge (q) carried by each of the particles. Which of the following expression for l is dimensionally correct?.

• I = sqrt((nq^2)/(εk_BT))

• I = sqrt((εk_BT)/(nq^2))

• I = sqrt(q^2/(εn^{2/3}k_BT))

• I = sqrt(q^2/(εnk_BT))

Evaluation [Page 38]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide Chapter 1 Nature of Physical World and MeasurementEvaluation [Page 38]

Evaluation | Q II. 1. | Page 38

Briefly explain the types of physical quantities.

Evaluation | Q II. 2. | Page 38

How will you measure the diameter of the Moon using the parallax method?

Evaluation | Q II. 3. | Page 38

Write the rules for determining significant figures.

Evaluation | Q II. 4. | Page 38

What are the limitations of dimensional analysis?

Evaluation | Q II. 5. | Page 38

Define precision and accuracy. Explain with one example.

Evaluation [Pages 38 - 39]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide Chapter 1 Nature of Physical World and MeasurementEvaluation [Pages 38 - 39]

Evaluation | Q III. 1. i) | Page 38

Explain the use of a screw gauge and vernier caliper in measuring smaller distances.

Evaluation | Q III. 1. ii) | Page 38

Write a note on the triangulation method and radar method to measure larger distances.

Evaluation | Q III. 2. | Page 38

Explain in detail the various types of errors.

Evaluation | Q III. 3. | Page 38

What do you mean by the propagation of errors? Explain the propagation of errors in addition and multiplication.

Evaluation | Q III. 4. a) | Page 39

Write a short note on the following.

Unit

Evaluation | Q III. 4. b) | Page 39

Write a short note on the following.

Rounding - off

Evaluation | Q III. 4. c) | Page 39

Write a short note on the following.

Dimensionless quantities

Evaluation | Q III. 5. | Page 39

Explain the principle of homogeneity of dimensions. What are its uses? Give example.

Evaluation [Page 39]

### Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide Chapter 1 Nature of Physical World and MeasurementEvaluation [Page 39]

#### Numerical Problems

Evaluation | Q IV. 1. | Page 39

In a submarine equipped with sonar, the time delay between the generation of a pulse and its echo after reflection from an enemy submarine is observed to be 80 s. If the speed of sound in water is 1460 ms-1. What is the distance of an enemy submarine?

Evaluation | Q IV. 2. | Page 39

The radius of the circle is 3.12 m. Calculate the area of the circle with regard to significant figures.

Evaluation | Q IV. 3. | Page 39

Assuming that the frequency γ of a vibrating string may depend upon i) applied force (F) ii) length (l) iii) mass per unit length (m), prove that ϒ ∝ 1/lsqrt(F/m) using dimensional analysis.

Evaluation | Q IV. 4. | Page 39

Jupiter is at a distance of 824.7 million km from the Earth. Its angular diameter is measured to be 35.72˝. Calculate the diameter of Jupiter.

Evaluation | Q IV. 5. | Page 39

The measurement value of the length of a simple pendulum is 20 cm known with 2 mm accuracy. The time for 50 oscillations was measured to be 40 s within 1 s resolution. Calculate the percentage accuracy in the determination of acceleration due to gravity ‘g’ from the above measurement.

Evaluation

## Tamil Nadu Board Samacheer Kalvi solutions for Class 11th Physics Volume 1 and 2 Answers Guide chapter 1 - Nature of Physical World and Measurement

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Concepts covered in Class 11th Physics Volume 1 and 2 Answers Guide chapter 1 Nature of Physical World and Measurement are Introduction to Science, Measurement of Basic Quantities, Significant Figures, Introduction to Physics, Physics in Relation to Technology and Society, Theory of Errors, Measurement, Dimensions and Dimensional Analysis.

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