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PROBLEM SOLVING AND PYTHON PROGRAMMING QUIZ

1) What is the first step in problem-solving? A) Writing code B) Debugging C) Understanding the problem D) Optimizing the solution Answer: C 2) Which of these is not a step in the problem-solving process? A) Algorithm development B) Problem analysis C) Random guessing D) Testing and debugging Answer: C 3) What is an algorithm? A) A high-level programming language B) A step-by-step procedure to solve a problem C) A flowchart D) A data structure Answer: B 4) Which of these is the simplest data structure for representing a sequence of elements? A) Dictionary B) List C) Set D) Tuple Answer: B 5) What does a flowchart represent? A) Errors in a program B) A graphical representation of an algorithm C) The final solution to a problem D) A set of Python modules Answer: B 6) What is pseudocode? A) Code written in Python B) Fake code written for fun C) An informal high-level description of an algorithm D) A tool for testing code Answer: C 7) Which of the following tools is NOT commonly used in pr...

Java important question - 10

Can we use String with switch case ?
          One of the java7 features was improvement of switch case to allow strings. So if you are using java 7 or higher version, you can use String in switch case statement.
private static void printColorUsingSwitch                                                (String color) {
switch(color) {
case "blue":
     System.out.println("Blue");
     break;
case "red":
     System.out.println("Red");
     break;
default :
     System.out.println("Invalid color       
                                       code");
}

Q) Difference between String, StringBuilder and StringBuffer in java
String :
          String is immutable object. The object created as a string is stored in the Constant string pool. Every immutable object in Java is thread safe, that implies string is also thread safe. String cannot be used by two threads simultaneously. 
          String once assigned cannot be changed.
String demo = "hello";
     // The above object is stored in constant string pool and it's value cannot be modified.
demo ="Bye";
     // new "Bye" string is created in constant pool and referenced by the demo variables
     // "hello" string still exists in string constant pool and it's value is not overridden but we lost referenced to the "hello" string

StringBuffer
          StringBuffer is mutable means one can change the value of the object. The object created through StringBuffer is stored in the heap. StringBuffer has the same methods as the StringBuilder, but each method in StringBuffer is synchronized that is StringBuffer is thread safe. Due to this it does not allow two threads to simultaneously access the same method. Each method can be accessed by one thread at a time. But being thread safe has disadvantage too as the performance of the StringBuffer hits due to thread safe property. Thus StringBuilder is faster than the StringBuffer when calling the same method of each class. 
     StringBuffer value can be changed, it means it can be assigned to the new value.
     StringBuffer can be converted to the string by using toString() method.
StringBuffer demo1 = new StringBuffer                                            ("Hello");
// The above object stored in heap and it's value can be changed.
demo1 = new StringBuffer ("Bye");
// The above statement is right as it modifies the value which is allowed in the StringBuffer

StringBuilder:
          StringBuilder is same as the StringBuffer, it stores the object in heap and it can also be modified. The main difference between the StringBuffer and StringBuilder is that StringBuilder is not synchronized. StringBuilder is fast as it is not thread safe.
StringBuilder demo2 = new StringBuilder                                          ("Hello");
// The above object too is stored in the heap and it's value can be modified.
demo2 = new StringBuilder ("Bye");
// The above statement is right as it's modifies the value which is allowed in the StringBuilder.

     

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Abbreviations

No :1 Q. ECOSOC (UN) Ans. Economic and Social Commission No: 2 Q. ECM Ans. European Comman Market No : 3 Q. ECLA (UN) Ans. Economic Commission for Latin America No: 4 Q. ECE (UN) Ans. Economic Commission of Europe No: 5 Q. ECAFE (UN)  Ans. Economic Commission for Asia and the Far East No: 6 Q. CITU Ans. Centre of Indian Trade Union No: 7 Q. CIA Ans. Central Intelligence Agency No: 8 Q. CENTO Ans. Central Treaty Organization No: 9 Q. CBI Ans. Central Bureau of Investigation No: 10 Q. ASEAN Ans. Association of South - East Asian Nations No: 11 Q. AITUC Ans. All India Trade Union Congress No: 12 Q. AICC Ans. All India Congress Committee No: 13 Q. ADB Ans. Asian Development Bank No: 14 Q. EDC Ans. European Defence Community No: 15 Q. EEC Ans. European Economic Community No: 16 Q. FAO Ans. Food and Agriculture Organization No: 17 Q. FBI Ans. Federal Bureau of Investigation No: 18 Q. GATT Ans. General Agreement on Tariff and Trade No: 19 Q. GNLF Ans. Gorkha National Liberation Front No: ...

PROBLEM SOLVING AND PYTHON PROGRAMMING QUIZ

1) What is the first step in problem-solving? A) Writing code B) Debugging C) Understanding the problem D) Optimizing the solution Answer: C 2) Which of these is not a step in the problem-solving process? A) Algorithm development B) Problem analysis C) Random guessing D) Testing and debugging Answer: C 3) What is an algorithm? A) A high-level programming language B) A step-by-step procedure to solve a problem C) A flowchart D) A data structure Answer: B 4) Which of these is the simplest data structure for representing a sequence of elements? A) Dictionary B) List C) Set D) Tuple Answer: B 5) What does a flowchart represent? A) Errors in a program B) A graphical representation of an algorithm C) The final solution to a problem D) A set of Python modules Answer: B 6) What is pseudocode? A) Code written in Python B) Fake code written for fun C) An informal high-level description of an algorithm D) A tool for testing code Answer: C 7) Which of the following tools is NOT commonly used in pr...

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Understanding Electromagnetic Waves: The Invisible Messengers of Energy Electromagnetic (EM) waves are everywhere around us, shaping the way we live and communicate, though most of the time we are unaware of their presence. From the light we see to the signals carrying our favorite songs on the radio, EM waves play a fundamental role in both nature and modern technology. In this post, we’ll explore the nature of electromagnetic waves, their types, and their significance in daily life. What Are Electromagnetic Waves? At their core, electromagnetic waves are fluctuations of electric and magnetic fields that travel through space. Unlike sound waves, which need a medium like air or water to propagate, electromagnetic waves can travel through a vacuum. This means they can traverse the vast emptiness of space, which is how sunlight reaches Earth from the Sun. The discovery of electromagnetic waves is credited to James Clerk Maxwell in the 19th century. He formulated a set of equations—now kn...