SSLC / 10th - Science - Book Back Answers - Physics Unit 2 - English Medium
Tamil Nadu Board 10th Standard Science - Physics Unit 2: Book Back Answers and Solutions
This post covers the book back answers and solutions for Unit 2 – Physics from the Tamil Nadu State Board 10th Standard Science textbook. These detailed answers have been carefully prepared by our expert teachers at KalviTips.com.
We have explained each answer in a simple, easy-to-understand format, highlighting important points step by step under the relevant subtopics. Students are advised to read and memorize these subtopics thoroughly. Once you understand the main concepts, you’ll be able to connect other related points with real-life examples and confidently present them in your tests and exams.
By going through this material, you’ll gain a strong understanding of Physics Unit 2 along with the corresponding book back questions and answers (PDF format).
Question Types Covered:
- 1 Mark Questions: Choose the correct answer, Fill in the blanks, Identify the correct statement, Match the following
- 2 Mark Questions: Answer briefly
- 3, 4, and 5 Mark Questions: Answer in detail
All answers are presented in a clear and student-friendly manner, focusing on key points to help you score full marks.
All the best, Class 10 students! Prepare well and aim for top scores. Thank you!
Topic:
I. Choose the correct Answer
1. The refractive index of four substances A, B, C and
D are 1.31, 1.43, 1.33, 2.4 respectively. The speed of light is maximum in
a) A
b) B
c) C
d) D
Answer Key:
a) A
2. Where should an object be placed so that a real and
inverted image of same size is obtained by a convex lens
a) f
b) 2f
c)
infinity
d)
between f and 2f
Answer Key:
b) 2f
3. A small bulb is placed at the principal focus of a
convex lens. When the bulb is switched on, the lens will produce
a) a convergent beam of light
b) a
divergent beam of light
c) a
parallel beam of light
d) a
coloured beam of light
Answer Key:
b) a
divergent beam of light
4. Magnification of a convex lens is
a) Positive
b) negative
c)
either positive or negative
d)
zero
Answer Key:
b) negative
5. A convex lens forms a real, diminished point sized
image at focus. Then the position of the object is at
a) focus
b) infinity
c) at
2f
d)
between f and 2f
Answer Key:
b) infinity
6. Power of a lens is –4D, then its focal length is
a) 4m
b) –40m
c)
–0.25 m
d)
–2.5 m
Answer Key:
d)
–2.5 m
7. In a myopic eye, the image of the object is formed
a) behind the retina
b) on the retina
c) in
front of the retina
d) on
the blind spot
Answer Key:
c) in
front of the retina
8. The eye defect ‘presbyopia’ can be corrected by
a) convex lens
b) concave lens
c) convex mirror
d) Bi focal lenses
Answer Key:
d) Bi focal lenses
9. Which of the following lens would you prefer to use
while reading small letters found in a dictionary?
a) A convex
lens of focal length 5 cm
b) A concave lens of focal length 5 cm
c) A convex lens of focal length 10 cm
d) A
concave lens of focal length 10 cm
Answer Key:
d) A
concave lens of focal length 10 cm
10. If VB, VG, VR be the velocity of blue, green and red light
respectively in a glass prism, then which of the following statement gives the
correct relation?
a) VB = VG = VR
b) VB > VG >VR
c) VB <
VG < VR
d) VB <
VG > VR
Answer Key:
II. Fill in the blanks
- The path of the light is called as ………
- The refractive index of a transparent medium is always greater than ……….
- If the energy of incident beam and the scattered beam are same, then the ………. scattering of light is called as scattering ……….
- According to Rayleigh’s scattering law, the amount of scattering of light is inversely proportional to the fourth power of its ……….
- Amount of light entering into the eye is controlled by ……….
Answer Key:
- ray
- unity
- elastic
- wavelength
- iris
III. State whether the following statements are true or false. correct the statement if it is false.
- Velocity of light is greater in denser medium than in rarer medium.
-
The power of lens depends on the focal length of the lens.
- Increase in the converging power of eye lens cause ‘hypermetropia’
- The convex lens always gives small virtual image.
Answer Key Key:
- False – Velocity of light is greater in rarer medium than in denser medium.
-
True
-
True
-
False – The convex lens does not give small virtual image always.
IV. Match the following
Question 1.V. Assertion & Reasoning
Mark the correct choice as-
(a) If both assertion and reason are true and reason is the correct explanation of assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of assertion.
(c) Assertion is true but reason is false.
(d) Assertion is false but reason is true.
1. Assertion: If the refractive index of the medium is high (denser
medium) the velocity of the light in that medium will be small
Reason: Refractive index of the medium is inversely proportional to the velocity of the light.
2. Assertion: Myopia is due to the increase in the converging power of eye lens.
Reason: Myopia can be corrected with the help of concave lens.
Answer Key:
1. (a)
2. (a)
VI. Answer briefly
Question 1.VII. Give the answer in detail
Question 1.VIII. Numerical Problems
Question 1.IX. Hot questions
Question 1.
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