PADMA SESHADRI BALA BHAVAN SENIOR SECONDARY SCHOOL
K.K.NAGAR
STD: TEN ASSIGNMENT SHEET (2017-2018)
ANSWER THE FOLLOWING QUESTIONS IN YOUR RESPECTIVE NOTE BOOKS
PHYSICS
LESSON-LIGHT: REFLECTION AND REFRACTION
1) Define the following terms
i. source- self luminous ,nonluminous.
ii. Medium-transparent, translucent, opaque
iii. Ray-convergent, divergent, parallel.
iv. Reflection-regular, irregular, diffuse.
2) State laws of reflection of light.
3) What is the angle of reflection for normal incidence?
4) List the characteristics of images formed by plane mirror.
5) Prove that the image is as far behind the mirror as the object is in front of a mirror
6) Prove that the size of image is equal to the size object
7) List the English alphabet that I. shows lateral inversion
ii. do not show lateral inversion. Why ?
8) Draw ray diagram to show lateral inversion.
9) Define the following
i. spherical mirror
ii. Concave mirror
iii. Convex mirror
iv. Centre of curvature
v. pole
vi. radius of curvature
vii. principal axis
viii. aperture
10) With the help of a neat labelled diagram explain the terms
i. Principal focus and focal length of a concave mirror
ii. Principal focus and focal length of a convex mirror
11) Concave mirrors are converging mirrors, convex mirrors are diverging mirrors. why?
12) What is a real focus? which mirror has it?
13) What is virtual focus? Which mirror has it?
14) What is a focal length of plane mirror?
15) State the rules for drawing ray diagrams for concave and convex mirror.
16) A ray passing through the centre of curvature retraces its path. Why?
17) Prove R=2f
18) Draw neat ray diagram for the following position of object in front of a concave mirror.
I .Object at infinity
ii. Object at beyond c
iii .object at c
iv. Object between C&F
V. Object at F
VI. Object between F & P
Write the key, nature, size and position of image for all the diagrams.
19) List the uses of concave mirror and substantiate with relevant ray diagrams.
20) Write the differences between real and virtual images.
CHEMISTRY
LESSON: PERIODIC CLASSIFICATION
1) Write
a) Number of elements discovered
b) Number of elements known in year 1800
c) Basis on which scientists tried to classify elements during the year 1800
2) What are triads?
3) State the law of triads by Dobereiner.
4) List the names of the elements, of the triads classified by Dobereiner.
5) State newlands law of octaves.
6) List the limitations of the classifications of elements by newland.
7) On what property was mendeleev’s periodic table based.
8) State mendeleev’s periodic law.
9) Why did Mendeleev choose compounds of oxygen and hydrogen of elements for
studying chemical properties.
10) List
a) Achievements of mendeleev’s periodic table.
b) Demerits of mendeleev’s periodic table
BIOLOGY
LESSON: LIFE PROCESSES
1) What criteria do we use to decide whether something is alive?
2) Why is diffusion insufficient to meet the oxygen requirement to meet the oxygen
requirement of multicellular organisms?
3) Define: Nutrition
4) Differentiate between autotrophic and heterotrophic nutrition.
5) Name the raw materials needed by green plants for photosynthesis. From where
are these obtained?
6) Define: Photosynthesis. Give the relevant equation.
7) Identify the by product of photosynthesis and list the functions of stoma
8) List the events that take place during photosynthesis.
9) Draw a neat labelled diagram of the cross-section of a leaf.
10) Prove with the help of experiments:
a) Light is essential for photosynthesis.
b) Chlorophyll is necessary for photosynthesis.
c) CO2 is necessary for photosynthesis.