polymorphism and symbols in ruby

Faq.txt

Q1) How to declare a symbol in ruby?

ans: Before the symbol name we need use ":" character to define a symbol.

Q2) How many type of polymorphism can be done in ruby?

ans: Two types : i) using inheritance
                 ii) using duck typing

Q3) What is duck typing in polymorphism ?

ans: It implements what can be implemented on the object rather than instance of the class.

Q4) Why polymorphism?

ans : It allow to peform many operation from a instance of single class using inheritance and duck typing in ruby.

Mcq.txt

Q1) What symbol use for inheritance in ruby?

a) >
b) <
c) ::
d) none of the aboves

ans: b) <

Q2) what will be the output of this statement:
    
        class Cars
      def tweek
          puts "wooooommm"
      end
  end

  class Bmw<Cars 
      def tweek
          puts "grnnnnn"
      end
  end

  bmw = Cars.new
  puts bmw.tweek
  
a) "grnnnnn"
b) "wooooommm"
c) "wooooomm"
   "grrnnnn"
d) none of the above

ans: b)

Q3) What will be the output this program?

      class Cars
      def tweek(bir)
          bir.tweek
      end
  end

  class Bmw<Cars 
      def tweek
          puts "grnnnnn"
      end
  end

  bmw = Cars.new
  puts bmw.tweek(Bmw.new)
  
a) "grnnnnn"
b) "wooooommm"
c) "wooooomm"
   "grrnnnn"
d) none of the above

ans: a)

Q4) what is be the output of this statement:
    
    :pepcoder
    puts :pepcoder.class
    
a) literal
b) Object
c) Symbol
d) None of the aboves

ans: c)