Tuesday 28 February 2017


Light
class 8
Give one word for the following :
1. The invisible energy which causes in use the sensation of vision.
2. The ray of light which travels towards a mirror.
3. A line which is drawn at right angles to the mirror surface at the point of incidence.
4. Name one type of mirror which always form virtual image.
5. What type of image is formed on the cinema screen ?
6. Which cells on the retina respond to the intensity of light.
7. The part of the eye which preserves its shape and protects it from external injuries.
8. The phenomenon due to which we can judge depth.
9. The most sensitive part of the retina.
Fill in the blanks :
1. The point at which the incident ray falls on the mirror is called ___________________
2. If a ray of light is incident on a plane mirror at an angle of 300, its angle of reflection is _______________.
3. If a ray of light is incident normally on a mirror, i = __________ and r = ________________
4. The image of our face in a plane mirror is an example of ___________ image.
5. The distance of the image behind the plane mirror is _________ to the distance of the object in front of it.
6. The principle of ___________is made use of in motion picture projection in cinematography.
7. The presence of __________________ cells on the retina helps us to see in dim light.
8. The coned shaped cells of our retina respond to _____________
9. Due to the absence or insufficient number of ____________ cells a person becomes colour blind.
10. Owls and bats are able to see at night due to the presence of ______________ cells in their retina.


LIGHT
class 7

Q.1 Fill in the blanks:-
(i) Light always travels in a ____________.
(ii) Change in direction of light after striking a polished surface is called ____________.
(iii) The phenomenon of left appearing right and right appearing left on reflection from a mirror is called _____________.
(iv) Real images are always ____________ while virtual images are always __________. (erect/inverted)
(v) The reflecting side of a concave mirror curves ____________ while the reflecting side of a convex mirror curves ______________ (inwards/outwards)
(vi) Concave mirrors from ____________ and ____________ images whereas the image formed by a convex mirror is always ____________ (real/virtual)
(vii) ____________ mirrors are used as rear/side view mirrors and ____________ mirrors are used as reflectors of headlights of vehicles.
(viii) A ____________ lens converges rays of light falling on it hence it is also called a ____________ lens.
(ix) A concave lens always forms a ____________ (real/virtual) image which is ____________ (erect/inverted) and ____________ (smaller/bigger) than the object.
(x) Formation of shadows suggest that light travels in __________ lines.
(xi) A __________ lens is thicker in the middle and tapering at the edges.


Water
I.Fill in the blanks:
1.The process by which plants evaporate water is called _________________.
2.The major natural source of water is _________________.
3. Water vapour gets added to the atmosphere by _________________ and ___________________.
4.Water disappears from wet clothes by the process of ___________________.
5. The source of water below the ground such as wells, tubewells, lakes etc. is known as _______.
6. In winter mornings , __________is formed due to condensation of water vapour near the ground.
7. Many tiny water droplets high up in the air, come together and fall down as _____________, __________ and ___________.
8. The amount of the seepage of ________ into the ground affects the availability of ground water.
II. Name the following:
1.Two natural sources of water.
2. Two fresh water bodies.
3.Two rainwater harvesting techniques
4.Four uses of water at home.
5. The two processes through which water vapour enters the air.
6. Two adverse effects of floods.
7. Two adverse effects of drought.
8. Two factors leading to shortage of usable water on the earth.
III. Write true or false:
1. Open wells are fed by ground water:
2. Life is possible on earth without water:
3. Saline water is fit for drinking and other domestic, agricultural and industrial needs:
4. Evaporation of water takes place at all times:
5. Concrete land surfaces increases the seepage of rainwater into the ground:
6. About two-thirds of the earth is covered with water.
7. When water is heated, it changes into ice.
IV. Define the following:
i. Water cycle.
ii. Rainwater harvesting.
V. Distinguish between:a) Evaporation and condensation.
b) floods and droughts


Monday 27 February 2017

                                                   Class 8                                            
                                         RAY DIAGRAM

Saturday 25 February 2017

worksheet for class 6,7,and 8


GSc. Class - VIII
Chemical Effects of Electric Current
ASSIGNMENT (revision worksheet)
Q1. What do you understand by chemical effect of current?
Q2. Differentiate between conductors and insulators with examples.
Q3. Why distilled water isused an insulator? How can it be made a conductor?
Q4. What are electrodes? Name two elements that can be used to make electrodes.
Q5. List the various chemical effects produced when electric current is passed through a conducting solution.
Q6. What happens when electric current passes through water by keeping two electrodes immersed in it?
Q7. What is electroplating? Give its three uses.
Q8. What is the disadvantage of electroplating?
Q9. Describe an experiment to show the process of electroplating. Alsoexplain in detail why we find a coating of copper on the negative electrode.
Q10. You are given a carbon rod, a copper plate and copper sulphate solution. Explain the arrangement you will do to get a coating of copper on the carbon rod.
Q11.Give reasons for the following:
   1. Chromium is used for electroplating.
   2. Iron cans used for storing food items are electroplated with tin.
   3. Bridges and automobiles are either painted or coated with zinc to prevent rusting. Why aren’t they electroplated?
   4. We should never handle electrical appliances with wet hands.

Science Class - VII
MOTION AND TIME

Q1. Define speed. State its S. I. unit.
Q2. Differentiate between uniform and non-uniform motion.
Q3. Describe a simple pendulum. Draw a diagram. What kind of motion does it show?
Q4. For a simple pendulum; define:-
        a) One oscillation
        b) Time period
        c) Frequency
Q5. A truck travels a distance of 540 km in 4.5 hours. Calculate its speed.
Q6. The distance between two stations is 1995 km. How much time it will take to cover this distance at an average speed of 19 km/h?
Q7. A car takes 20 minutes to cover a distance of 15 km. Calculate its speed in km/h.

G.Sc. CLASS - VI
LIGHT SHADOWS AND REFLECTIONS

Q1. What are luminous and non-luminous objects? Give examples.
Q2. Differentiate between transparent, translucent and opaque objects with examples.
Q3. What is a shadow? How is it formed?
Q4. List the conditions essential for the formation of a shadow.
Q5. Classify the following as transparent, translucent and opaque objects:
       a)Stone                                                   f) Wood
       b)Wax paper                                           g) Smoke
       c)Reading glasses                                 h) Leather
       d)Common salt                                       i) Blood
       e)Skin of a drum                                     j) Dense fog
Q6. What type of shadows are formed by transparent, translucent and opaue objects?
Q7. Why do we not see the shadow of aeroplanes and birds flying in the sky?
Q8. State the principle behind the working of a pinhole camera. Describe in detail how youwill make a simple pinhole camera at home.
Q9. List the characteristics of the image formed in a pinhole camera.
Q10. Describe an activity to show that light travels in a straight line.
Q11. Define reflection of light.



Monday 20 February 2017


Class-VI
Plant world
Part I - Assignment - 3
1. Enlist the function of roots?
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2. Enlist the function of stem?
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3. Enlist the function of Leaf?
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4. Give 2 examples of each __
a. Herbs .................... , ......................
b. Shrubs .................... , ......................
c. Trees .................... , ......................
5. What are the main difference between a taproot and fibrous root?
Taproot Fibrous root.
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6. Fillup the following by using kewords given ____
Pistil, stem, root, anther, petal, filament.
i) The underground part of the plant is called _______________.
ii) The female reproductive part of the plant is _______________.
iii) The part of plant that conduct water and mineral is called __________.
iv) _________ and ___________ are parts of stamen.
v) ________ is the most attractive part of the flower

GENERAL SCIENCE Class-VII
REPRODUCTION IN PLANTS

Fill in the blanks:-
1 In -------- reproduction a new plant body is formed by a single parent .
2. A small bulb like structure found in yeast is called -------------.
3. The male gamete on the stigma reach the female gamete inside the ovary through ---------
4. Male gametes are present in the --------- and the female gametes are present in the ----------
5. After fertilization of the egg , ther ovary becomes ------and ovules become -----------.

Name the following :-
1.Two organisms which reproduce by budding
2.The method by which moss and ferns reproduce?
3. The type of flower which has both the male and the female reproductive parts?
4.A plant which multiply by fragmentation,

VERY SHORT ANSWER TYPE:
Q1. What happens when a leaf of bryophyllum falls on moist soil?
Q2. Write two examples of plants in which roots can give rise to a plant.
Q3. What are the parts of a pistil?
Q4. From where, fungi are grown on a bread piece?
Q5 List the agents which help in cross pollination.
Q6 Give examples of seeds dispersed by water, wind and insects.
Q 7 . What are spores?

SHORT ANSWER TYPE QUESTIONS
Q1. Differentiate between:
        i) unisexual flowers and bisexual flowers
        ii) asexual and sexual reproduction
        iii) self pollination and cross pollination

Q2. How is zygote formed in sexual reproduction?
Q3. How are plants benefited by seed dispersal?
Q4. How spores can survive for a long time?
Q5. In vegetative reproduction plants take less time to grow and bear flowers and fruits , than plants produced from seeds? Why?
Q6. How does the process of fertilization take place in flowers?
Q7. Write short notes on the following:
        a) budding                 b) fragmentation                         c) spore formation
Q8. What is the significance of dispersal of seeds .
Q 9 What are the characteristic features of seeds dispersed by water and animals?
Q10. Differentiate between stamen and pistil.

CELL- STRUCTURE AND FUNCTIONS
class 8
Q1. Fill Ups:
i. Cells were first observed in cork by ________________.
ii. ___________________ is the longest cell in our body.
iii. ______________ is the smallest cell known with a size of ____________ micrometer.
iv. ______________ is present in plant cell but absent in animal cell while, ___________ is present in animal cell and absent in plant cell.
v. ________________ in human blood is a single cell.
vi. A _______________ is a group of cells performing a specific function.
vii. _______________ are used to colour parts of the cell to study their details.
viii. The plastids responsible for green color of leaves is ____________________.
ix. __________ controls the transfer of a hereditary characteristic from parents to offspring.
x. _____________________ cells having nuclear material without nuclear membrane.
xi. The cells, like onion cells and cheek cells are example of __________________cells.
xii. ___________________ is a structure that contains more than one type of tissues.
xiii. The porous membrane that allows the movement of materials between the cytoplasm and the inside of the nucleus is ________________________________.