6. What is the range of numbers returned by Math.random() method?

1. 1. 0 to 100

   
   
   

   2. 0.0 to 1.0

   
   
   

   3. -1 to 1

   
   
   

   4. -1.0 to 1.0

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   Math.random() returns only double value greater than or equal to 0.0 and less than 1.0.

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7. How many bits are used for generating random numbers?

1. 1. 16

   
   
   

   2. 8

   
   
   

   3. 32

   
   
   

   4. 48

   
   
   

   5. 64

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   Random number can accept 64 bits but it only uses 48 bits for generating random numbers.

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8. What would be the output of following code snippet?
   int ran = random.nextInt(10) + 1;

1. 1. Random number between 1 to 10, excluding 10

   
   
   

   2. Random number between 1 to 10, excluding 1 and 10

   
   
   

   3. Random number between 1 to 10, including 1 and 10

   
   
   

   4. Random number between 1 to 10, excluding 1

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   random.nextInt(10) + 1; returns random numbers between 1 to 10 including 1 and 10.

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9. What would be the output of following code snippet?
   int ran = random.nextInt(10) + 2;
   

1. 1. Random number between 4 to 10, excluding 4 and 10

   
   
   

   2. Random number between 2 to 11, including 2 and 11

   
   
   

   3. Random number between 2 to 11, excluding 2 and 11

   
   
   

   4. Random number between 2 to 10, including 2 and 10

   
   
   

   5. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   random.nextInd(10) + 2; returns random numbers between 2 to 11 including 2 and 11. it follows “nextInt(max – min +1) + min” formula.

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10. Math.random() guarantees uniqueness?

1. 1. False

   
   
   

   2. true

   
   
   

   3. NA

   
   
   

   4. NA

   
   
   

   5. NA

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   Math.random() doesn’t guarantee uniqueness. To guarantee uniqueness we must store the generated value in the database and compare against already generated values.

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