Grade 7 Science worksheet

Science worksheet

Science formulae of acid, bases and salts

Note:This is a mere support extended towards students. It does not mean to replace classroom solutions.

S#	Chemical  Name	Formula	Uses	Special Point
1	Acetic Acid	CH3COOH	Used in vinegar	Ethanoic acid
2	Hydrochloric acid	HCL	Clean washrooms	Muriatic acid
3	Nitric acid	HNO3	Used in making fertilizers and plastic Purification of gold	Spirit of niter or aqua fortis Highly corrosive
4	Sulphuric acid	H2SO4	Used in chemical industries	Oil of vitriol
5	Carbonic acid	H2CO3	Used in cold drinks	Carbonated water, acid of air, carbon di oxide solution
6	Phosphoric acid	H3PO4	Toothpaste, food industry	Weak acid also called orthophosphoric acid
7	Calcium hydroxide	Ca(OH)2	White wash walls	Slaked lime
8	Magnesium hydroxide	Mg(OH)2	Antacid, also used as food additive	Milk of magnesia
9	Sodium hydroxide	NaOH	Chemical pulping, tissue digestion, used in soaps	Caustic soda
10	Potassium hydroxide	KOH	Used as an electrolyte Used in making soft soaps. Used as ph control agent and food stabilizer Used in manicure as chemical cuticle removing agent	Caustic potash
11	Ammonium hydroxide	NH4OH	Used in window cleaners Used in making of Nylon	Aqua ammonia or ammonia water
12	Sodium bicarbonate	NaHCO3	Used in baking cakes, biscuits etc	Baking soda
13	Sodium Chloride	Nacl	Food preservation, taste agent in food, fire extinguisher, cleaning agent	Common salt
14	Ammonium chloride	NH4Cl	Used in metal work, medicine, food etc	Nushadir salt, Sal ammoniac
15	Magnesium sulphate	MgSO4	Food preparation, medicine, agriculture etc	Epsom salt
16	Copper sulphate	CuSO4	Used in pesticides,soil sterilization, disinfecting agent. It is toxic.	Cuprous sulfate or Dicopper sulfate
17	Calcium Carbonate	CaCO3	Used to make cement, health and dietary applications	Limestone, marble, chalk
18	Potassium  nitrate	KNO3	Use in production of nitric acid, meat processing, pharmacological use, fertilizer etc	Salt peter, nitrate of potash
19	Potassium chloride	KCl	Used in fertilizers, medical uses and culinary	Sylvite, muriate of potash
20	Iron oxide	Fe2O3.10H2O	Used in iron ores, pigments, catalysts and in thermite. Used as pigment in color concrete, paints and durables	Rust
21	Sodium carbonate	Na2CO3	Used in glass manufacturing, washing powders. It is also used as water softner	Soda ash, washing soda

Data Structures

Grade BCA

Data structures

Question Bank

• Write advantages of Hashing.
• Explain the difference between B- Tree and B+ Tree.
• Explain traversal of graph.
• What is m-way Search tree?
• What is Data structure?
• List out the areas in which data structures are applied extensively?
• Explain variable length record.
• What is topological sorting?
• What is the basic difference between direct and access and index sequential files?
• Describe two applications of general trees?
• What is B+ tree?
• What are the data structures used to perform recursion?
• What is the difference between graph and tree?
• Discuss advantages of graphs.
• Discuss major features of B-trees.
• Explain AVL Tree.
• Describe the complexity of heap sort.
• Discuss the complexity of Binary search.
• Draw all binary search trees with 5 nodes A,B,C,D and E that        

 satisfy the balance requirement of AVL trees.

• Explain Sorting.
• What is spanning tree?
• Explain File.
• Write the use and advantages of files.
• What is file organization?
• Discuss few important applications of search trees.
• What is binary search tree? Explain in detail the insertion and        deletion in a binary search tree.
• What are threaded binary trees? What are the applications?

                                         OR

     What is meant by threading? Discuss its relevance.

                                                OR

     What are threads?  What are its advantages and

     disadvantages? How threads are implemented in trees?

      Explain through an example.

• Explain the role of threads in binary search tree with suitable Example.
• What do you mean by AVL tree? How to insert node into AVL  tree? Explain.
• Discuss uses and advantages of AVL search tree with suitable   
• What uses and advantages of AVL search tree with suitable

examples.

• What is B-Tree? write an algorithm to insert a key into a B-

Tree and delete a key from B-Tree?

• Write short note on B-Tree?
• Explain B+ trees and its advantages with suitable

examples.

                                              OR

Write a short note on B+ Tree?

• Give a brief Idea about general trees?

                                                         OR

          What are general Trees? discuss the steps for conversion of

          general Trees to binary Trees?

• What are huffman‘s algorithm ?how it is useful and used?

  Discuss with Examples?

                                                   OR

Describe Huffman ‘s algorithm?

• Describe m-way search Tree?
• Describe the various operation on graph?

                                             OR

Explain the different operations performed on graph ?

• Describe Warshall algorithm for shortest path with

Example?

                                                 OR

What do you mean by shortest path? explain Warshall

algorithm for shortest path?

• Describe Dijkstra algorithm for shortest path?
• What do you mean by shortest path?
• Describe Dijkstra algorithm for shortest path with example?
• Discuss topological sorting and in the advantage with suitable example?
• Explain topological sorting?
• What is traversal of graph? How is it useful and use Explain with suitable example?
• Explain Traversal of graph?
• What do you mean by graph traversal? Explain depth first and breadth first traversal of graph.
• Explain various types of graph?
• What is the quick sort? how it is use and useful? Explain its complexity with suitable examples?
• Explain quick sort algorithm?
• Explain merge sort and its complexity with examples?
• Explain merge sort algorithm?
• Explain linear search and its advantages, disadvantages and complexity?
• Describe binary search?
• Write an algorithm to search an aliment using binary search?
• Differentiate between linear search and binary search?
• What are the differentiate between internal and external sorting?
• Which sorting algorithm is the best on the basis of complexity and why?
• Compare various sorting algorithm on basis of complexity?
• Describing merging?
• Define File. Describe constituent of a file?
• Write a short note on file operations?
• Describe various kind of operations required to maintain files briefly?
• Explain various types of file? According to function they perform?
• Discuss serial file organisation its advantages and disadvantages?
• Write a short note on sequential file organisation?
• What are the steps to access a record of a file? Also draw flow chart of this.
• What are the steps for updating a sequential file?
• Discuss the advantages and disadvantages of sequential file processing?
• Explain direct access file organisation there use and advantages?
• What do you understand by indexed by sequential file? Discuss the different technique for handling overflows in indexed sequential file?
• What is multi list file organisation? Explain by an example.
• Explain inverted list file organisation by taking examples.
• Differential between inverted list and multi list file organisation?
• Describe fixed and variable length records with examples?
• Describe primary and secondary key with Examples?
• Differentiate between fixed and variable length record?
• Explain hashing function and their relatives and merits and demerits?
• Write a short note on hashing?
• What do you understand by hashing? Explain various hashing function using suitable examples?
• What do you mean by hashing function? Describe various types of hashing function. Give suitable examples.
• What are the collisions? How are these harmful and resolved? Discuss with Examples?