ISRO CSE 2020 PYQ ⋆ CSE Study247

Question 56

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2020 PYQ

For the distributions given below : Which of the following is correct for the above distributions?

A Standard deviation of A is same as standard deviation of B B Standard deviation of A is slightly lower than standard deviation of B C Standard deviation of A is significantly lower than standard deviation of B D Standard deviation of A is significantly higher than standard deviation of B

📘 Solution & Detailed Explanation

🔢 Step-by-Step Solution

Step-by-Step Analysis:

Standard deviation measures the dispersion or spread of data points relative to their central mean. It depends entirely on the shape and spread of the distribution, not on whether the values lean toward the higher or lower end of the scale.

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Observe the Shapes:
	• Distribution A has frequencies of [5, 4, 3, 2, 1] for the values [10, 20, 30, 40, 50].
	• Distribution B has frequencies of [1, 2, 3, 4, 5] for the same values [10, 20, 30, 40, 50].

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Mirror Images:
	• Distribution B is a perfect horizontal reflection (mirror image) of Distribution A.
	• While their means (averages) are different—Distribution A's mean is pulled toward the lower side (\(23.33\)) and Distribution B's mean is pulled toward the higher side (\(36.67\))—the distance of the bars relative to their respective means is identical.

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Conclusion:
	• Because the two datasets have identical frequency structures and variation profiles, their deviations from their means are perfectly symmetrical.
	• Consequently, the variance and standard deviation of both distributions are exactly the same.

Question 57

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2020 PYQ

The hardware implementation which provides mutual exclusion is

A Semaphores B Test and set instructions C Both options D None of the options

Question 58

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2020 PYQ

Remote Procedure Calls are used for

A communication between two processes remotely different from each other on the same system B communication between two processes on the same system C none of the above D communication between two processes on the separate systems

Question 59

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2020 PYQ

Consider the following recursive C function that takes two arguments

JAVASCRIPT

unsigned int rer(unsigned int n, unsigned int r){
    if(n>0)return(n%r + rer(n/r,r));
    else return 0;
}
What is the return value of the function rer when it is called as rer(513,2)?

A 9 B 8 C 2 D 5

Question 60

MCQ · Single Correct 1 mark

Previous Year Question ISRO CSE 2020 PYQ

A given grammar is called ambiguous if

A two or more productions have the same non-terminal on the left hand side B a derivation tree has more than one associated sentence C there is a sentence with more than one derivation tree corresponding to it D brackets are not present in the grammar