Question Discussion & Solution

• The Best example of Run time polymorphism is Function Overriding
• Function Overloading is the example of Compile time polymorphism
• Protected is an Access modifier  

Important Point

Compile-time polymorphism

It means binding is occurring at compile time It can be achieved through static binding. If a class has multiple methods having the same name but different in parameters, it is known as Method Overloading.

Run time polymorphism

At run time we came to know which method is going to invoke It can be achieved through dynamic binding. If subclass (child class) has the same method as declared in the parent class, it is known as method overriding

Access Modifiers

It specifies the accessibility or scope of a field, method, constructor, or class. There are three types of Access modifiers

• Public: The methods or data members that are declared as public can be accessed anywhere in the program.
• Private:  The methods or data members declared as private are accessible only within the class in which they are declared.
• Protected: The methods or data members declared as protected can accessible within the same class or class which is inherited from it.

The correct answer is Golden Gloves.

• The 'Golden Glove Award' is presented to the most outstanding goalkeeper at each FIFA World Cup finals.
• An award has been given to the best goalkeeper since the first World Cup in 1930. 

Additional Information

• The FIFA Women’s World Cup 2023 will be staged in Australia and New Zealand.
• It will also be the first to be hosted by Australia and New Zealand.

Explanation:- 

• Oxidation is a chemical reaction in which oxygen is added to a substance or hydrogen is removed from the substance. The oxidizing agent is the chemical compound that provides oxygen or removes hydrogen from the reactants. Oxidizing agents are also known as Oxidant or Oxidizer. 
• Here, Aluminium is the only metal that forms a protective layer of its own oxide Al₂O₃. This Aluminium Oxide layer serves as a barrier and prevents the element Aluminium from further corrosion.

Additional Information

•  Gold (Au):- Gold is a noble metal, it belongs to group 11 and it is least reactive. It shows +1 and +3 oxidation states.
• Silver (Ag):-  It is a white lustrous element of group 11. Being a noble metal it is less reactive in nature. Silver is a good conductor of electricity.
• Aluminum (Al):- Aluminium is a metal from group 13, It is a light-weighted silvery metal with 3+ valency. Common Oxidation states shown by Aluminium is +1, +2, +3. 
• Iron (Fe):- Iron is a highly reactive metal, It reacts with the oxygen present in the air very easily and forms Iron oxides like FeO, Fe₂O_3, Therefore, Iron undergoes rusting

 .Hint :- Au, Ag, both are  less reactive in nature, Iron is highly reactive, whereas Al is reactive in nature but doesn't react with air due to the formation of Al₂O₃ 

The correct answer is X-Ray.

• Electromagnetic (EM) radiation includes radiation via radio waves, microwaves, X-rays and gamma rays.

Key Points

• Electromagnetic (EM) radiation is a form of energy that is all around us and takes many forms.
• Electromagnetic (EM) radiation includes radiation via radio waves, microwaves, X-rays and gamma rays.
• Sunlight is also a form of EM energy.

​Additional Information

• ​EM radiation spans an includes a range of wavelengths and frequencies.
• This range is known as the electromagnetic spectrum.
• The EM spectrum is generally divided into seven regions:
  • Radio waves,
  • Microwaves,
  • Infrared (IR),
  • Visible light,
  • Ultraviolet (UV),
  • X-rays,
  • Gamma rays.

Important Points

• Radio waves have the longest wavelength.
• Gamma rays have the shortest wavelength.

The chemical substance present in bones and teeth is Calcium Phosphate or Ca₃(PO₄)₂.

• Calcium phosphate is fundamental to the formation of bone and teeth.
• It is essential for achieving optimal peak bone mass in the first 2–3 decades of life and for the maintenance of bone in later life.
• Bones:-
  • Bones are mostly made of collagen, a type of protein.
  • Calcium phosphate, a mineral, is the other main component of the bones.
  • Collagen gives the bones a soft framework, while calcium phosphate is what makes them hard and strong.
  • Bones are made of living tissues, so old bone tissue is broken down and removed, and then new tissue is created to replace the old.
• Teeth:-
  • Enamel – the hard, outer layer of your teeth – is made of minerals like calcium phosphate.
  • Enamel is harder than the bones. It's the hardest substance in the whole body.
  • However, unlike the bones, the teeth enamel doesn't contain any living tissues and so can't heal on its own.