Pseudorandom Number Generators Multiple Choice Questions and Answers (MCQs)

This set of Data Structures & Algorithms Multiple Choice Questions & Answers (MCQs) focuses on “Pseudorandom Number Generators”.

1. What is pseudo random number generator?
a) an algorithm that generates random numbers with help of mathematical formula
b) an algorithm that generates random numbers according to user activity
c) an algorithm that generates random numbers according to time
d) an algorithm that generates random numbers with help of user input
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2. What should be the return type of rand() function?
a) int
b) float
c) long
d) double
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3. What is the purpose of using function srand()?
a) to set the seed of rand() function
b) to generate random numbers
c) to enable rand() function
d) to improve efficiency of rand()
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4. What is the range of rand()?
a) 0 to RAND_MAX
b) 0 to infinity
c) 0 to 2147483647
d) 0 to 32767
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5.What is the correct formula for generating random numbers in the range (lower,upper) using rand()?
a) rand() % (upper – lower)
b) rand() + lower
c) (rand()%(upper-lower)) + lower
d) (rand()%(upper-lower+1)) + lower
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6. Which of the following will generate random numbers in the range 1-100 (both inclusive)?
a) rand() % 100
b) rand() % 101
c) (rand() % (101)) + 1
d) (rand() % (100)) + 1
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7. What is the minimum value of RAND_MAX possible in any implementation?
a) 0
b) 32767
c) 2147483647
d) 128
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8. Function rand() generates unique random numbers every time.
a) true
b) false
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9. What is the default value of seed if function rand() is called before srand()?
a) srand(0)
b) srand(1)
c) srand(time(null))
d) srand(-1)
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10. Pseudo random number generators can be used for data encryption.
a) true
b) false
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11. Predict the output of the following code.

#include <stdlib.h> 
int main() 
{ 
     srand(0); 
     printf("%d\n", rand()); 
     return 0; 
}

a) compilation error
b) random number between 0 to RAND_MAX
c) cannot be predicted
d) 0
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12. Which header file contains the function rand() in C language?
a) stdlib
b) iostream
c) stdio
d) time
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13. Predict the output of the following code.

#include <stdlib.h> 
int main() 
{ 
     srand(0); 
     printf("%d\n", rand()%50); 
     return 0; 
}

a) compilation error
b) random number between 0 to 50 (both inclusive)
c) random number between 0 to 51 (both inclusive)
d) random number between 0 to 49 (both inclusive)
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14. Which of the following code will generate unique random numbers every time?
a)

#include <stdlib.h> 
int main() 
{ 
     srand(0); 
     printf("%d\n", rand()%50); 
     return 0; 
}

b)

#include <stdlib.h> 
int main() 
{ 
     srand(time(0)); 
     printf("%d\n", rand()%50); 
     return 0; 
}

c)

#include <stdlib.h> 
int main() 
{ 
    srand(1); 
    printf("%d\n", rand()%50); 
    return 0; 
}

d)

#include <stdlib.h> 
int main() 
{
     printf("%d\n", rand()%50); 
     return 0; 
}

15. Which of the following code will give an error?
a)

#include <stdlib.h> 
int main() 
{ 
     printf("%d\n", srand()); 
     return 0; 
}

b)

#include <stdlib.h> 
int main() 
{ 
     srand(time(0)); 
     printf("%d\n", rand()%50); 
     return 0; 
}

c)

#include <stdlib.h> 
int main() 
{ 
     srand(1); 
     return 0; 
}

d)

#include <stdlib.h> 
int main() 
{
     printf("%d\n", rand()%50); 
     return 0; 
}

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