Refraction of Light By a Glass Slab

                                                                                                                                                                         GLASS SLAB                                                                                                                                                                                                                                                                                               A parallel faced glass slab can be easily used to study the basic feature of the phenomenon of refraction.

We draw below the trace of the path of a ray of light as it travels through the two opposite parallel side, PQ and SR, of a rectangular glass slab

We draw that, on refraction through the parallel faced glass slab PQSR

1.The final refraction ray is parallel to the incident ray. however, it is displaced relative to the ray by an amount ,R, say                                                                                                                               2.The incident ray bends its path and travels along the direction within the glass slab. 

Global Language

Global Language

English is a global language. It has a number of words and phrases from different languages. Given below are words/phrases from Greek ,Latin ,German ,Italian or Spanish languages along with their meanings. Write the names of the languages in the space provided. The first one has been done for you.

HINT: you can use the dictionary. 

Words/phrases                                   Language                                    Meaning

1.       Ad hoc                                             Latin                                     for a particular purpose   

2.       Alma mater                                                                                 college/university attended   

3.       Blitzkrieg                                                                                      a sudden attack       

4.       Curriculum                                                                                   an outline of education and career        

5.       Et cetera                                                                                       so on                

6.       AD (Anno Domini)                                                                       in the year of the lord

7.       Vice-versa                                                                                     the other way round

8.       N.b. (Notabene)                                                                           note well

9.       Numero uno                                                                                 number one 

10.   Homosapiens                                                                                human being    

11.   Adios                                                                                              good-bye

12.   Eureka                                                                                            I’ve got it       

13.   Per capita                                                                                       each person 

14.   Per annum                                                                                     each year           

15.   Terra firma                                                                                     solid ground

16.   Bonafide                                                                                         genuine    

Do You Know ?

‘Achills’- son of peleus and Nereid thetis was the strongest of all Greeks in the famous Trojan war. His mother had dipped him in the river, holding him by the heel when he was very young. As a result, thus body was immune to any kind of hunt by swords, arrows etc. But only his heel was unprotected. Thus ,’Achilles heel’- stands for a weak spot in one’s personality. 

Ole Man River

Ole Man River

From the very beginning, river were important natural resources, as all ancient civilisations flourished near them. Given below are the clues about some old rivers, which may be regarded as landmarks of their respective countries. Read carefully the question and encicrcle the correct answer.

1.       Which river is famous for its salmon, and even forms a part of the border between English and Scotland. :  Nile/ Tweed         

2.       Which rivers is known as the yellow river ? :  Tsang Po/Hwang-Ho    

3.       Which two river meet at the city of Khartoum ? :  Angles-Tweed/Blue-white nile

4.       Which river is sometime known as Granta ? :  Danube/Ganga

5.       Which river flows into Caspian sea ? :  Volga/nile

6.       Which river’s name mean, ‘containing reeds’ in Sanskrit ? :  Chambal/betwa

7.       Which river is known as the Ganga of south india ? :  Krishna/Godavari

8.       On which river bank does Washington DC exist ? :  Cam/Potomac

9.       Which river flows throught the state of Karnataka ? :  Palar/Ganga

10.   Which is the longest river flowing in England ? :  Thames/Angles .

Do You Know ?

i.                     ‘Farm basin’ is the lowest point of arctic ocean.

ii.                   It is estimated that one-fifth of all the water that runs off

The earth’s surface is carried by the amazon.

                                                          

Find Out

Q. what do the words ‘ole’ and ‘khartoum’ mean ?

Stamp It Out

Stamp It Out

Stamps are not only a part of history but also play a very important role in the economy of a country. Read carefully the statements and answer the following questions. You can take help from the help box.

1.       Two India were featured in a set of stamp released by Guyana to honour prominent figures of the twentieth century. One was Mahatma Gandhi. Who was the other?

Answer-

2.       Inverted stamp are almost always very valuable. What are they?

Answer-

3.       Which country’s stamp never carry its name but are identified by inscription, like ‘postage due’ or the profile of the reigning monarch?

Answer-

4.       Which country’s first stamp was called ‘Scinde Dawk’?

Answer-

5.       Which European nation issues stamps inscribed with the words ‘Magyar Posta’?

Answer-

6.       Which country did not have trading stamps in the late nineteenth century?

Answer-

7.       What does the Geek word ‘Ateleia’ mean from which the word ‘philately’ is derived?

Answer-

8.       On 13 may 1998, the fans of which famous toy staged a demonstration in Los angeles for the launch of a stamp in its honour?

Answer-

9.       If ‘polska’ indicates Poland, which country does ‘sverige’ indicate?           

 Answer-

10.   Who was the first  Indian leader to be honoured with a stamp?

Answer-

The Naming Game

The Naming Game

Be a sport and show your sportsmanship! Name the following after carefully reading the given statements.

1.       Any two books written by the famous cricketer sunil gavaskar.

(i)

(ii)

2.       The chess-piece which can move any number of places in any direction. :

3.       The venue for commonwealth 2010 games. :

4.       The place where national institute of sports is situated in India. :

5.       The player, Harika, Dronavalli is associated with this game. :

6.       The computer against which Gary Kasparov played the game of chess. :

7.       The highest sports award in India. :

8.       The popularly board game invented in 1931 to improve vocabulary. :

9.       The cricketer popularly called ‘Nawab of Najafgarh’. : 

10.   The game played by Gosthopal whose statue is put up in kolkatta. :

11.   Any two sports played on pitches. : (i)                     (ii)

12.   Olympics held for the handicapped. :

Do You Know ?

Formula 1 race car has approximately 800 horsepower and

Rpm of 1800. The top racing speed is 225 miles per hour

                                 Approximately!

Find Out

Who won 08 gold medals for swimming in Olympics 2008 ?

Work Is Worship

Work Is Worship

Nowadays, we have a plethora of possible careers and many new exciting avenues. Let us read and name the professions of the people given below. Write the answer in the space provided.

1.       I write and compile dictionaries. :

2.       I translate what is said when people do not speak the same language. :

3.       I stuff animal skins to make them look like real animal. :

4.       I test eyesight, prescribe lenses and sell them. :

5.       I diagnose and treat mental illness. :

6.       I treat minor disorders of feet like corns etc. :

7.       I correct speech disorders. :

8.       I specialise in use of herbs to prevent diseases. :

9.       I make maps. :

10.   I advise the insurance company. :

11.   I make ladies hats. :

12.   I’m an expert at beautiful and artistic writing. :

13.   I introduce various actsin a live show. :

14.   I play recorded music or video and entertain on T.V. or radio. :

15.   I guide students on their choice of careers pattern. :

FIND OUT

Q. What does a soothsayer do ?

HAPPY TEACHER DAY

                                                TO NUMBER ONE TEACHER

I'm happy that you're my teacher;

 I enjoy each lesson you teach.

 As my role model you inspire me

 To dream and to work and to reach

With your kindness you get my attention;

 Every day you are planting a seed

 Of curiosity and motivation

 To know and to grow and succeed.

 You help me fulfill my potential;

I'm thankful for all that you've done.

 I admire you each day,

 and I just want to say,

 As a teacher, you're number one! 

- Joanna Fuchs

                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Hydro puzzle

Hydro puzzle

There are many terms in science with ‘hydro’ as their prefix. Given below are a few statements, answer to which are the terms prefixed with hydro. Read these statements carefully and write the answer in the space provided. You can take the help from the help from the help box.

1.       A compound of hydrogen and carbon:

2.       A highly poisonous volatile liquid having an odous of bitter almonds:

3.       The science of forces acting on or exerted by fluids:

4.       The process of generating electricity by the utilization of water:

5.       A gel in which liquid component is water:

6.       The process to undergo a chemical action of water:

7.       A chemical reaction of a substance with water usually resulting in decomposition:

8.       An instrument for measuring the density of liquid:

9.       It is the term used to describe having an affinity for water:

10.   A microphone to detect sound waves in water:

11.   The name of an aquatic plant:

12.   A light superfast motor boat designed to skim over the surface of water:

13.   The action of heated water on the earth’s crust:

14.   Tendency of plant roots to turn towards the moisture:

15.   A chemical or a mineral containing water:

16.   Accumulation of fluid in the brain especially in young children which enlarges the head and can cause mental handicap:

HEIP BOX                                               H       Carbon          Gel

Y        Lyze               Lysis

D       Meter             Us

R       Cephalus

O      Cyanic acid

         Dynamics

         Phyte

         Electric

         Plane

         Philic

        Tropism

        Phone

        Thermal

THE ANTI WORDS

The Anti words

‘Anti’ is greek words. It is prefix that stands for opposite or against. Read the given sentence and write the words beginning with ‘anti’. The frist one has been done for you.

1.       A remedy that counteracts poison :

2.       A drug that fights infection :

3.       Savlon, dettol,boric acid etc. are :

4.       An exact opposite of something :

5.       A strong dislike :

6.       A foreign body in blood :

7.       A deodorant is an :

8.       A device used to stop pollution :

9.       A harmful or an annoying person is :

10.   A movement opposite to the movement of thearm of a clock is called :

FIND OUT

What is the meaning of:

i.                     Anticlimax :

ii.                   Antifreeze :

iii.                  Antipodes :

iv.                 Antitoxin :