Question Discussion & Solution

The correct answer is Element.

Key Points

• An electric room heater or an electric heater used for cooking contains a coil of wire.
• The coil of wire used in electric heaters is called a heating element.
• The heating coil of the electric room heater transfers the electric energy into heat energy.
• The elements become red hot and give out heat after connecting to the electric supply.
• The amount of heat produced in a wire depends on its material used, length, and thickness.
• The coil of the electric heater is made up of nichrome.
• Nichrome consists of 80% nickel, 20% chromium.

Additional Information

• The filament is usually made of very thin tungsten wire.
  • In an incandescent bulb, an electric current is passed through a metal filament.
• A cell is a single unit device that converts chemical energy into electric energy.
  • It produces electricity capable to run smaller appliances.
• A battery usually consists of a group of cells.

Mistake Points

• A filament is a fine resistance wire the purpose of which is to emit white light. 
• An element is a resistive wire the sole purpose of which is to produce heat.

The correct answer is Application software.

Key Points

• Spreadsheets, photo editing, PowerPoint, word documents, etc, are examples of Application software.
  • Application software, or app for short, is software that performs specific tasks for an end-user.
  • Effectively, if the user is interacting directly with a piece of software it is application software.
    • For example, Microsoft Word or Excel is application software, as are common web browsers such as Firefox or Google Chrome.
  • It also includes the category of mobile apps, including communication apps such as WhatsApp or games such as Candy Crush Saga.

Additional Information

• System Software
  • System software is a type of computer program that is designed to run a computer's hardware and application programs.
  • If we think of the computer system as a layered model, the system software is the interface between the hardware and user applications.
  • The operating system is the best-known example of system software.
  • The OS manages all the other programs on a computer.
  • System software is used to manage the computer itself.
    • It runs in the background, maintaining the computer's basic functions so users can run higher-level application software to perform certain tasks.
    • Essentially, system software provides a platform for application software to be run on top of.
• System software generally includes the following features:
  • High speed
    • System software must be as efficient as possible to provide an effective platform for higher-level software in the computer system.
  • Hard to manipulate
    • It often requires the use of a programming language, which is more difficult to use than a more intuitive user interface (UI).
  • Written in a low-level computer language
    • System software must be written in a computer language the central processing unit (CPU) and other computer hardware can read.
  • Close to the system
    • It connects directly to the hardware that enables the computer to run.
  • Versatile
    • System software must communicate with both the specialized hardware it runs on and the higher-level application software that is usually hardware-agnostic and often has no direct connection to the hardware it runs on. 
• The platform is hardware and software architecture that acts as a foundation or base upon which other applications, processes, or technologies are developed.
  • In computing, platform refers to basic hardware i.e., computer system, and software i.e., the operating system on which software applications are often run. 

Statement: Should electric two wheelers be subsidized?

Argument:

I. Yes, Should electric two-wheelers be subsidized because electric two-wheelers do NOT create pollution. It prevents our country from pollutions and diseases related to pollution. Therefore, Argument I is strong.

II. Charging takes much longer than filling petrol. It means the charging process takes more time to charge and also consumes more electrical power and more time taking in comparison to petrol filling, but its cost is less than petrol. So, Argument II is not strong.

Here, we can say " Only Argument I is Strong".

Hence, "Only Argument I is Strong" is correct answer.

Inheritance

The capability of a class to derive properties from another class is called Inheritance

• The class that inherits properties from another class is called Subclass or Derived Class.
• The class whose properties are inherited by a subclass is called Base Class or Superclass.

Syntax for Inheritance

class derived_name : access_mode base_class

{

//body of derived class

};

Additional Information 

Polymorphism

Polymorphism is mainly divided into two types:

• Compile-time Polymorphism
• Runtime Polymorphism

Compile-time polymorphism

This is achieved by function overloading or operator overloading.

• Function Overloading - When there are multiple functions with the same name but different parameters then these functions are said to be overloaded
• Operator overloading - When there are multiple operations can be performed by using single operator is called operator overloading for example operator ‘+’ when placed between integer operands, adds them and when placed between string operands, concatenates them

Run Time Polymorphism

It is achieved by Function Overriding.

Conclusion

Feature of Reusability is followed by inheritance so the correct answer is the inheritance.

The Correct Answer is Cytokinin.

Key Points

• Cytokinins are a class of plant growth substances (phytohormones) that promote cell division or cytokinesis in plant roots and shoots.
• There are two types of Cytokinins: Adenine-type Cytokinins represented by Zeatin, Kinetin and 6-Benzylaminopurine and Phenylurea-type Cytokinins like Diphenylurea and Thidiazuron (TDZ).

Key Points 

• Auxins are a class of plant hormones with some morphogen-like characteristics. Auxins play a cardinal role in the coordination of many growths and behavioural processes in plant life cycles and are essential for plant body development.
• Abscisic acid is a plant hormone. ABA functions in many plant developmental processes, including seed and bud dormancy, the control of organ size and stomatal closure.
• Gibberellins are plant hormones that regulate various developmental processes, including stem elongation, dormancy, germination, flowering, flower development and leaf and fruit senescence.

 Additional Information