1. All the methods in the Math class are static methods. Mark for Review (1) Points True (*) False 2. What is the approximate value of PI? Mark for Review (1) Points 0 2.718 The value varies. 3.141 (*) 3. A constant field, like Math.PI is used to represent a fixed value. Mark for Review (1) Points True (*) False 4. Every method of the Math class returns a numerical result. Mark for Review (1) Poin
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1. All the methods in the Math class are static methods. Mark for Review (1) Points True (*) False 2. What is the approximate value of PI? Mark for Review (1) Points 0 2.718 The value varies. 3.141 (*) 3. A constant field, like Math.PI is used to represent a fixed value. Mark for Review (1) Points True (*) False 4. Every method of the Math class returns a numerical result. Mark for Review (1) Points True (*) False In. Refer to Section 4 Lesson 5. 5. What is the output? public static void main(String args[]) { String greeting = "Java World!"; String w = greeting.substring(7, 11); System.out.println(w); } Mark for Review (1) Points ld! orld! rld rld! (*) 6. A String is a sequence characters. Mark for Review (1) Points True (*) False 7. The replaceFirst() method replaces only the first occurrence of matching character pattern in a string. Mark for Review (1) Points True (*) False 8. String objects are immutable. Mark for Review (1) Points True (*) False 9. The String class must be imported using java.lang.String; Mark for Review (1) Points True False (*) 10. Which method returns the length of a String? Mark for Review (1) Points compareTo() findLength () length() (*) charAt() 11. What is the output? public static void main(String args[]) { String alphaNumeric = "Java World!" + 8; System.out.println(alphaNumeric); } Mark for Review (1) Points Compilation error. Java World!8 (*) Java World! 8 Java World! + 8 12. Using the Random class requires an import statement. Mark for Review (1) Points True (*) False 13. You need to generate random integer values between 0 and 80 (inclusive). Which statement should you use? Mark for Review (1) Points nextInt(80); nextInt(); nextInt(0-79); nextInt(81); (*) 14. You need to generate random integer values in the range 2 through 10. This code fragment will produce the desired result. Random r = new Random(); r.nextInt(9) + 2; Mark for Review (1) Points True (*) False 15. Which values are returned by the method nextBoolean(); Mark for Review (1) Points Returns the next value. Either a true or false. (*) An integer value. Nothing is returned.
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