class 8 -light
1. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray?

2.How many images of a candle will be formed if it is placed between two parallel plane mirrors separated by 40 cm?

3.Two mirrors meet at right angles. A ray of light is incident on one at an angle of 30° as shown in Fig. 16.19. Draw the reflected ray from the second mirror.

4. Fill in the blanks in the following.

(a) A person 1 m in front of a plane mirror seems to be ________ m away from his image.
(b) If you touch your ________ ear with your right hand in front of a plane mirror, it will be seen in the mirror that your right ear is touched with your _________.
(c) The size of the pupil becomes ________ when you see in dim light.
(d) Night birds have _________ cones than rods in their eyes.

5. Explain the term spectrum. Why does a glass prism split white light into its constituent colour?

6  What do you mean by refraction of light? In which direction will light bend when travelling from an optically rarer to denser medium?

7   Distinguish between myopia and hypermetropia. Draw diagrams top show how these defects can be corrected by using suitable lenses...

SCIENCE

LIGHT

Q.1 Fill in the blanks:-

 class 7 -light

(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.

class-7
Lesson-light
Respiration in Organisms
 Q.1 Fill in the blanks :
 1. The process of breaking down of food in the cell with the release of energy is called _______________ respiration. (Cellular / Anaerobic)
2. The taking in of air rich in exygen into the body is called ________________. (Inhalation / Exhalation).
 3. The openings in a cockroach’s body through which it takes in air in its body for respiration are called ________________. (Nostrils / Spiracles)
4. The large muscular sheet which forms the floor of the chest cavity is called ____________. (Diaphragm / Lungs).
 5. The number of times a person breathes in a minute is termed as the _______________ rate. (Breathing / Running)

 Q.2 Correct the following statements by replacing the highlighted word :

 1. Lungs are located in the buccal cavity : (Chest / Nasal) Ans. ______________________________________________________________
2. The type of respiration in which food is broken down without the use of oxygen is called aerobic respiration. (Cellular / Anaerobic) Ans. ______________________________________________________________
 3. Humans are anaerobes. (Yeast / Dogs) Ans. ______________________________________________________________
 4. Yeast respires anaerobically and yields water. (Fruit Juice / Alcohol) Ans. ______________________________________________________________
 5. When we feel drowsy, our breathing rate increases. (Remains same / Slows Down) Ans. ______________________________________________________________

Q.3. Match the following : Column I Column II
1. Glucose (with oxygen)                       a. 21% Oxygen, 0.04% Carbon Dioxide
2. Glucose (Without Oxygen)                b. 16.4% Oxygen, 4.4% Carbon Dioxide
 3. Glucose in muscles                            c. Carbon Dioxide + water + energy absence of oxygen)
 4. Inhaled air                                         d. Carbon Dioxide + Alcohol + Energy
5. Exhaled air                                         e. Lactic acid + Energy

. Q.: How do the following animals breathe ?
1. Earthworm 2. Cockroach 3. Frog 4. Leaves 5. Fish 6. Humans
Help Box Skin Lungs, Skin Stomata Teachea Gills Lungs

CLASS 6
REVISION -PLANT WORLD

VI science Chapter: Getting To Know Plants Assignment Important Questions

Q1. Differentiate between herbs and shrubs.
Q2. A boy goes to a garden and describes various types of plants. Identify the characteristics of plants on the basis of which they are classified as herbs, shrubs and plants. Give examples.
Q3. Differentiate between climbers and creepers. Give examples.
Q4. Why do some plants need support to climb upwards?
Q5. Enlist the functions of a stem.
Q6. A student keeps a twig in red ink. After few hours, he observes red lines in stem and leaves. Explain, what has happened?
Q7. Write a short note on modified stems.
Q8. Draw a well labelled diagram of a leaf.
Q9. A girl in biology laboratory observes a design on different leaves. She identified two particular kinds of pattern. Identify those patterns and write difference between two.
Q10. Draw a well labelled diagram of stomata.
Q11. Write down the functions of stomata.
Q12. A boy covers a leaf with a polythene bag and leaves it for 24 hours. What will he observe and why?
Q13 Enlist all the functions of a leaf.
Q14. Mention a test to detect presence of starch in a leaf.
Q15. What is the function of veins and midrib in a leaf?
Q16. Write down the functions of roots.
Q17. Write two points of difference between tap root and fibrous roots.
Q18. If we want to identify the kind roots of a plant, how can we find out by observing the leaves?
Q 19   . Give few examples of edible root
Q20. Write a short note on modified root.
Q21. Name 4 whorls of a flower.
Q22. Why are pistil and stamen very important in a plant?
Q23. Draw a well labelled diagram of a flower (vertical section).
Q24. How are fruits and seeds produced?
Q25. Why does a cactus plant have fleshy leaf like photosynthetic branches?
Q26. Why are leaves termed as the “food factories of the plant”?
Q27. Why are leaves of few plants modified into tendrils? Give examples

class 9 practicals LAW OF CONSERVATION OF MASS

QUESTION BANK SAII CLASS9
1 Name any two noble gases.

2. Write the chemical symbols of the following elements : Gold, Copper, Potassium, Silver, Platinum and Iron

3  (a) Derive the valency of an element having atomic number 5.

(b) Name the subatomic particle whose number is not same in isotopic species of an element.

 (c) Name the element which has no neutron in its atom.

4.  An atom contains 3 protons, 3 electrons and 4 neutrons. Find its atomic number, mass number and valency ?

5. (a) Define one mole, illustrate its relationship with Avogadro Constant.

 (b) Calculate the number of moles in :

(i) 12.044 3 1023 atoms of carbon.

 (ii) 64 g of oxygen atoms.

(iii) 66 g of carbon dioxide molecules ( atomic masses O=16, C = 12 )

6. In a chemical reaction between sodium sulphate and barium chloride, precipitate of barium sulphate is formed. The colour of the precipitate is : (a) Pink (b) White (c) Orange (d) Yellow

7. Which of the following reaction is not suitable to verify the law of conservation of mass in a chemical reaction ? (a) Precipitation reaction (b) Displacement reaction (c) Redox reaction (d) Nuclear reaction

8.(a) Why did Rutherford select gold foil for his molecule  a-particle scattering experiment

    (b)Write difference between O2 and 2O.

(c) Give one example in each of the following cases : (i) Monoatomic molecule (ii) Diatomic molecule (iii) Tri atomic molecule (iv) Tetraatomic?

9.(a) Which of the following species have 18 electrons ?

 Ca⁺² , K⁺ , Na , Cl^- , Ar

(b) Chemical properties of all the isotopes of an element are similar. State reason

10.. Define the following terms : (a) Atom (b) Molecule (c) Avogadro’s number (d) Valency (e) Molar mass

11. In order to verify the law of conservation of mass, we carry out chemical reactions in a closed container, so that

 (a) gaseous products do not escape

 (b) heat transfer does not occur

(c) reactants do not mix with the products

(d) none of the above

12. On heating 60 g of Calcium carbonate 26.4 g of carbon dioxide escapes. What will be the amount of residue left ? (a) 33.6 g (b) 12.6 g (c) 86.4 g (d) 26.4 g

13. An element X has a valency of 2. Write the formula of its oxide?

14. One element has atom with 15 electrons. (2) a) Draw a diagram to show the electron distribution

 b) Write the electronic configuration in its -3 ion state.

c) Name the element.

15. .a) Calculate the number of Aluminium ions in 0.051 gms of Al2O3. (Atomic mass of Al = 27u, O = 16 u, NA = 6.022 x 1023 mol-1 ). .

Sol.  Molecular weight of aluminium oxide = 2x 27+3 x16 =54 +48 =102 g/mol

 102 g of Al2 O3 contains 2x 6.022 x10 23

Al3+ ions 0.051 g of Al2 O3 contains= 2x 6.022 x10 23 Al3+ ions

6.022 x 10 20 Al3+ ions

 b) Name the elements present in baking soda.

16. .Which of the following are isotopes and which are the isobars? Argon, Protium, Calcium, Deuterium Explain why the isotopes have similar chemical properties but they differ in physical properties?

 Sol. Chemical properties of isotopes are same because they have same atomic number and hence same no. of valence electrons.Physical properties differ because they have dfferent  mass number.

 17.  Enlist the conclusions drawn by Rutherford from his alpha-ray scattering experiment

 18. Write the chemical formulae of : i) Calcium Phosphate ii) Ammonium hydroxide

19. Calculate:-  (a) The mass of 1.0505 x 1023 molecules of carbon dioxide (CO2)?

(b) The number of molecules of 0.25 moles of NH3?

(c) The formula unit mass of Na2SO3. (Atomic Mass : Na = 23 u, S = 32 u,C=12u, N=14u, O = 16 u, H = 1 u, NA = 6.022 x 1023 mol-1 )

20. When we make copper sulphate and sodium carbonate react to prove law of conservation of mass. The product formed will be:

 (a) copper carbonate and sodium carbonate. (b) copper carbonate and sodium sulphate.

 (c) copper sulphate and sodium sulphate. (d) copper sulphate and sodium carbonate.

21 Define the term atomic mass unit

22. .What is the number of electrons in Ca and Ca+2. Write their electronic configuration?

23. .Differentiate between isotopes and isobars giving one example of each? Why do isotopes show similar chemical properties? 

24..(a) State any two Bohr's postulates about the model of an atom?

  (b) Write the electronic configuration of an atom whose atomic number is 19 and mass number 39.

Write the number of protons and the number of neutrons present in it.

25. a) Calculate the number of atoms in 120 gms of Calcium and 120 gms of iron.Which one has more number of atoms and how much is the difference.(Given : Calcium = 40 u, Iron = 56 u)

 b) Write the chemical formulae of: i) Hydrogen Sulphide ii) Ammonium Carbonate

26. When we react lead nitrate and sodium chloride to get lead chloride and sodium nitrate so as to prove law of conservation of mass, which of the following statements is correct:-

 (a) Mass of lead nitrate = Mass of sodium chloride

 (b) Mass of lead nitrate + Mass of sodium chloride = Mass of lead chloride + Mass of sodium nitrate.

 (c) Mass of lead chloride + Mass of sodium chloride = Mass of lead nitrate + Mass of sodium nitrate.

 (d) Mass of sodium chloride + Mass of sodium nitrate = Mass of lead chloride + Mass of lead nitrate

27. (a) Define polyatomic ion.

(b) Write the name of the compound (NH₄ )₂ SO₄ and mention the ions present in it. 

28. (a) Derive the valency of an element having atomic number 5.

(b) Name the subatomic particle whose number is not same in isotopic species of an element.

 (c) Name the element which has no neutron in its atom.

29. Name any two noble gases

.

30. Write the chemical symbols of the following elements : Gold, Copper, Potassium, Silver, Platinum and Iron

31. (a) Write two points of difference between an atom and an ion.

(b) Calculate the number of moles in :

 (i) 12.044 3 1023 atoms of carbon.

 (ii) 64 g of oxygen atoms.

(iii) 66 g of carbon dioxide molecules ( atomic masses O=16, C = 12 )

32. For the following chemical equation, if the law of conservation of mass is correct, what would be the number of H2 molecules ? N₂+H₂®2NH₃

 (a) 2 (b) 3 (c) 4 (d) 6

33.  If the law of conservation of mass is correct then what are the number of molecules of KCl and oxygen obtained in the following reaction ? 2KClO₃® KCl + O₂

(a) KCl=2, O₂=2 (b) KCl=1, O₂=3 (c) KCl=2, O₂=3 (d) KCl =3, O₂=2

SYLLABUS FOR FA4 2016- 2017

CLASSES-VIII, VII, VI
CLASS VIII
SYLLABUS FOR FA-4
LESSON-12 PRESSURE
LESSON13-SOUND
PROJECT-COLLECT INFORMATION ON NOISE POLLUTION
-sources of noise pollution
-causes and effects
ASSIGNMENT-Group activity (Collage/Role play)  Five applications of pressure in daily life (Illustrate with the help of pictures).(class activity)

CLASS-VI
SYLLABUS FOR FA-4
LESSON-9 MOVEMENTS IN THE BODY
LESSON-14 MAGNETS AND THEIR EFFECTS
PROJECT-With the help of pictures explain the movements in different animals and label their locomotory organs.
ASSIGNMENT-Activity on properties of magnet.Observe the activities and write the particular property associated with the activiy.(will be done in the class)

CLASSVII
SYLLABUS FOR FA-4
LESSON-11 TRANSPORTATION AND EXCRETION
LESSON-15 LIGHT AND ASSOCIATED PHENOMENON
PROJECT-  CPR or cardiopulmonary resuscitation.Write down the steps or basic procedure that is used in case of emergencies like heart attack or if someone is saved from drowning in water.
ASSIGNMENT- Identification of mirrors and lenses and properties associated with them.(class activity)