Why do we apply paint on iron articles?

-

Ques 18: Why do we apply paint on iron articles?

Ans 18: Iron articles are painted because it prevents them from rusting. When painted,  the contact of iron articles from moisture and air is cut off. Hence, rusting is prevented their presence is essential for rusting to take place.  



««Previous question            Next question»»

Comments

Post a Comment

Popular posts from this blog

Diagonal Relationship between Beryllium and Aluminium || Relation between Beryllium and Aluminium

-
  Diagonal Relationship between Beryllium and Aluminium The ionic radius of Beryllium (Be 2+) is estimated to be nearly 31 pm; the charge/radius ratio Or e/m ratio is nearly the same as that of the Al 3+ ion. Hence beryllium resembles aluminium in these ways. Some of the similarities are given below: » Like Aluminium, Beryllium(be) is not readily attacked by acids H+ donor because of the formation of an oxide film on the surface of the metal by reacting with oxygen, i.e. they are rendered passive by nitric acid. » Beryllium hydroxide[[Be(OH)4]2] dissolves in excess of alkali to give a beryllate ion, [ Be(OH)4]2– just as aluminium hydroxide[Al(OH)3] gives aluminate ion, [Al(OH)4] » The chlorides of metals beryllium and aluminium have Cl– bridged chloride structure in vapour phase. Both the chlorides are soluble in organic solvents and are strong as Lewis acids They are used as Friedel Craft catalysts. » Beryllium(Be) and aluminium(Al) ions have strong tendency to form complexes, (Be...
Read more

Simple Calculator using Tkinter

-
import tkinter as tk root = tk.Tk() root.title('BASIC CALCULATOR') root.geometry('640x480+300+300') root.resizable(False, False) title = tk.Label(  root,  text='Simple Calculator',  font=('Timesnewroman 18 bold'),  bg='green',  fg='#AB1' ) var1=tk.DoubleVar() var2=tk.DoubleVar() var1_label = tk.Label(root, text='Number1: ') var1_inp = tk.Entry(root, textvariable=var1) var2_label = tk.Label(root, text='Number: ') var2_inp = tk.Entry(root, textvariable=var2) plus_btn = tk.Button(root, text=' + ') minus_btn = tk.Button(root, text=' - ') mul_btn=tk.Button(root,text='*') divide_btn=tk.Button(root,text='/') output_var = tk.StringVar(value='') output_line = tk.Label(  root,  textvariable=output_var,  anchor='w',  justify='left' ) title.grid(columnspan=4) var1_label.grid(row=10,column=0) var1_inp.grid(row=10,column=1) var2_label.grid(row=10,column=2) var2_inp.grid(row=10,colu...
Read more

Computer science MCQ questions Class 12 Python

-
 SECTION-A 1. When reading a file line by line, the exact contents can be printed by: (A) Using readline ( ) (B) Using readlines ( ) (C) Using ‘,’ after every print statement (D) Both (A) & (B) 2. Choose the correct Python expression for the following mathematical expressions p+q/(r+s)4 (A) p+q / math.pow ((r+s), 4) (B) p+q/(r+s)^4 (C) p+q / math.pow (r+s,4) (D) (p+q) / math.pow (r+s) 3. Identify the correct statement for opening text file data.txt in total folder of c:drive in read mode. (A) F = open (“c:\\total\\data.txt”, “r”) (B) F = open (“c:\total\data.txt”, r) (C) F = open (“c:\total\data.txt”) (D) F = open (“\total\data.txt”, “r”) 4. A valid combination of atoms and operators forms a Python (A) Statement (B) Expression (C) Condition (D) None of these. 5. The default file open mode in Python is (A) Write (B) Read (C) Append (D) Read/write 6. In Python, a block is executed in an .................... (A) Function (B) Module (C) Py file (D) Execution frame 7. Consider ...
Read more

Computer science Solutions term 1 || Objective Type Questions MCQS || Objective Answers Class 12 Solution || Computer Science ||

-
1 . A function in Python begins with which keyword? (a) void (b) return (c) int (d) def Ans : (d) def 2 . Name the statement that sends back a value from a function. (a) print (b) input (c) return (d) None Ans : (c) return 3 . Functions that do not return any value are known as: (a) fruitful functions (b) void functions (c) library functions (d) user-defined functions Ans : (b) void functions 4 . A variable created or defined within a function body is classified as: (a) local (b) global (c) built-in (d) instance Ans : (a) local 5 . Which of the following arguments works with implicit values that are used if no value is provided? (a) keyword (b) required (c) variable-length (d) default Ans : (d) default 6 . Which values are used by the functions to communicate information back to the caller? (a) local (b) global (c) return (d) random Ans : (c) return 7 . What is the output of the program given below? x = 50 def func (x) :  x = 2 func (x) print ('x is now', x) (a) x is now 50 (b)...
Read more

MECHANICAL PROPERTIES OF SOLIDS

-
             1. Introduction   The motion of a body depends on how mass is   distributed within the body. We restricted ourselves to simpler situations of rigid bodies. A rigid body generally means a hard solid object having a definite shape and size. But in reality, bodies can be stretched, compressed and bent. Even the appreciably rigid steel bar can be deformed when a sufficiently large external force is applied on it. This means that solid bodies are not perfectly rigid.A solid has definite shape and size. In order to change (or deform) the shape or size of a body, a force is required. If   you stretch a helical spring by gently pulling its ends, the length of the spring increases slightly. When you leave the ends of the spring, it regains its original size and shape.  The property of a body, by virtue of which it tends to regain its   original size and shape when the applied force is removed, is known as elasti...
Read more