Download DUET Master 2018 DU PhD in Computer Science Question Paper With Answer Key

Download DUET (Delhi University Entrance Test conducted by the NTA) 2018 DU PhD in Computer Science Question Paper With Solution Key

This post was last modified on 29 January 2020

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DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

DU PhD in Computer Science

Topic:- DU_J18_PHD_CS

Which of the following statements is true for TCP protocol? [Question ID = 2770]
1. TCP is a connection-less unreliable protocol. [Option ID = 11080]
2. TCP is a connection-less reliable protocol. [Option ID = 11079]
3. TCP is a connection-oriented reliable protocol. [Option ID = 11077]
4. TCP is a connection-oriented unreliable protocol. [Option ID = 11078]
Correct Answer :-

TCP is a connection-oriented reliable protocol. [Option ID = 11077]
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The file space allocation of Unix Operating System is [Question ID = 2773]
1. Linked [Option ID = 11090]
2. Single level indexed [Option ID = 11091]
3. Multi-level Indexed [Option ID = 11092]
4. Contiguous [Option ID = 11089]
Correct Answer :-

Multi-level Indexed [Option ID = 11092]
The worst-case time complexity of searching an element out of n elements is [Question ID = 2754]
1. T(n) for complete binary tree and BST while T(logn) for AVL tree. [Option ID = 11015]
2. (nlogn) for complete binary tree, T(n) for BST and T(logn) for AVL tree. [Option ID = 11014]
3. T(n) for complete binary tree while T(logn) for BST and AVL tree. [Option ID = 11013]
4. T(logn) for complete binary tree, BST and AVL tree. [Option ID = 11016]
Correct Answer :-

T(n) for complete binary tree and BST while T(logn) for AVL tree. [Option ID = 11015]

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This examination paper has 100 multiple-choice questions of one mark each, with each question having four choices only one of which is correct. Each incorrect answer fetches -0.25 mark. Suppose you choose all your answers randomly with uniform probability. Then the expected mark you obtain is [Question ID = 2759]
1. 6.25 [Option ID = 11036]
2. 0 [Option ID = 11033]
3. 37.5 [Option ID = 11035]
4. 17.5 [Option ID = 11034]
Correct Answer :-
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6.25 [Option ID = 11036]
Suppose we are given pointers to first and last nodes of a singly linked list containing n elements (where each node contains pointer to the next node). Which of the following operations cannot be performed in time independent on the length of the linked list? [Question ID = 2753]
1. Insert a new element as the last element. [Option ID = 11012]
2. Insert a new element as the first element. [Option ID = 11011]
3. Delete the first element. [Option ID = 11009]
4. Delete the last element. [Option ID = 11010]
Correct Answer :-

Delete the last element. [Option ID = 11010]
A CPU has 32 bit address lines and 16 bit datalines. The maximum primary memory addressing capacity of the CPU is [Question ID = 2768]
1. 4 MB [Option ID = 11072]
2. 2 GB [Option ID = 11070]
3. 64 KB [Option ID = 11069]
4. 4 GB [Option ID = 11071]
Correct Answer :-

4 GB [Option ID = 11071]
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Which of the following inter-process communication mechanism is most efficient in an operating system? [Question ID = 2772]
1. Semaphore [Option ID = 11087]
2. Shared memory [Option ID = 11085]
3. Message Passing [Option ID = 11086]
4. Message queue [Option ID = 11088]
Correct Answer :-

Shared memory [Option ID = 11085]
In a QAM Modulation scheme, the baud-rate is 4 kilobaud/second. The lowest carrier frequency is 102 KHz. The bandwidth of the channel is 1 MHz. The number of digital channels created would be [Question ID = 2769]
1. 300 [Option ID = 11076]
2. 250 [Option ID = 11075]
3. 200 [Option ID = 11073]
4. 225 [Option ID = 11074]
Correct Answer :-

225 [Option ID = 11074]

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To reduce thrashing in virtual memory, which of the following data structures is most suitable? [Question ID = 2774]
1. Queue [Option ID = 11096]
2. Array [Option ID = 11094]
3. Hashing [Option ID = 11095]
4. Stack [Option ID = 11093]
Correct Answer :-
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Stack [Option ID = 11093]
10)
III. In the context of Project Tiger, many observers have noted that the country is now home to approximately two-thirds of the tigers in the world. But many have sounded a note of caution and said a lot more effort is required before we can declare tiger populations to be robust over the long term in India. These efforts usually mean increasing vigilance against poaching of tigers and their prey, expanding existing tiger reserves.
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However, there is an opposing group of public intellectuals that considers social justice to be of paramount importance in India. In their estimation, forests are as much cultural and social places as they are a habitat for wildlife. Forests are home to one in eight Indians, and tiger conservation has come at a terrible human cost; tribals have been forced out of forests, uprooted from their social and cultural context, deprived of education, development and livelihoods, plunged into poverty, and remained either unwilling or unable to integrate into the mainstream. Conservation of the tiger, they say, should not be at the cost of the fundamental rights of our citizenry.
In the last two decades or so, elected governments in India have sanctioned the cutting down of forests to build highways, flattened forests for coal and other minerals, and drowned out forests for dams, significantly devastating wildlife and forest dwellers alike. These sanctions are accompanied by statements of reassurance that it is possible to balance economic development with ecological and social concerns. Notwithstanding these platitudes, both conservationists and social justice activists feel short-changed by a government set on accelerating swiftly towards the edge of ecological destruction.
The great game playing out in the forests of our country continues. The tiger, forests, and forest dwellers will remain pawns in this great game. It remains to be seen if conservationists and social justice activists can reconcile their differences to collaboratively call out the conductor before it is curtains.
'a lot more effort is required' to save the tiger, says the author. What kind of 'effort' is required? [Question ID = 53375]
1. Providing congenial environment for wildlife to flourish. [Option ID = 93488]
2. Ensuring they get their prey easily. [Option ID = 93487]
3. Saving tigers from being hunted, as also preserving their habitat. [Option ID = 93486]
4. All of these [Option ID = 93489]
Correct Answer :-

Saving tigers from being hunted, as also preserving their habitat. [Option ID = 93486]

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11)
I. Generating clean renewable electricity is crucial for India where nearly 300 million people-about a quarter of its population-live without access to electricity. Today, India is one of the lowest per capita consumers of electricity in the world; even when people are connected to the electricity grid, they face frequent disruptions. Add to that the projected economic growth and the increase in population, and the demand for energy in India is expected to double by 2040.
According to Onno Ruhl, World Bank Country Director in India, with around 300 days of sunshine every year, India has among the best conditions in the world to harness solar energy. The rapid expansion of solar power can improve the quality of life for millions of Indians, especially for its poorest citizens. It can also create thousands of jobs in the solar industry and underpin progress in all areas of development, helping the country fulfill its dream of becoming the 'India of the future'.
But Energy storage systems play a vital role to enhance capacity firming and smoothing the variable and intermittent power output from solar plants. The need for Energy Storage is thus indispensable in lieu of growing share of solar power in India's energy basket.
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With the year on year declining price trend of solar and energy storage technologies, the time is not very far when not only commercial and industrial customers but also residential customers would become prosumers where they will produce and consume the electricity in-house and this will be possible with the hybrid solution of solar and storage.
Another market, which will grow in the near future, will be second life of the battery where the batteries (after few modifications) from the electric vehicles after their life can be used for the solar applications which will further reduce the solution cost of solar plus storage.
Mark the statement that is NOT true: [Question ID = 53373]
1. Both commercial and residential power users could become producer and consumers of solar power in the near future [Option ID = 93481]
2. Solar power will be the major source of power in the near future. [Option ID = 93479]
3. Solar power could be a driver of progress in all areas of development [Option ID = 93480]
4. Even today people face frequent power disruptions. [Option ID = 93478]
Correct Answer :-

Solar power will be the major source of power in the near future. [Option ID = 93479]
12)
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I. Generating clean renewable electricity is crucial for India where nearly 300 million people-about a quarter of its population-live without access to electricity. Today, India is one of the lowest per capita consumers of electricity in the world; even when people are connected to the electricity grid, they face frequent disruptions. Add to that the projected economic growth and the increase in population, and the demand for energy in India is expected to double by 2040.
According to Onno Ruhl, World Bank Country Director in India, with around 300 days of sunshine every year, India has among the best conditions in the world to harness solar energy. The rapid expansion of solar power can improve the quality of life for millions of Indians, especially for its poorest citizens. It can also create thousands of jobs in the solar industry and underpin progress in all areas of development, helping the country fulfill its dream of becoming the 'India of the future'.
But Energy storage systems play a vital role to enhance capacity firming and smoothing the variable and intermittent power output from solar plants. The need for Energy Storage is thus indispensable in lieu of growing share of solar power in India's energy basket.
With the year on year declining price trend of solar and energy storage technologies, the time is not very far when not only commercial and industrial customers but also residential customers would become prosumers where they will produce and consume the electricity in-house and this will be possible with the hybrid solution of solar and storage.
--- Content provided by‌ FirstRanker.com ---
Another market, which will grow in the near future, will be second life of the battery where the batteries (after few modifications) from the electric vehicles after their life can be used for the solar applications which will further reduce the solution cost of solar plus storage.
How will the 'second life of the battery' benefit the consumers? [Question ID = 53379]
1. People can have a mobile solar power production source. [Option ID = 93502]
2. The use of electric vehicle batteries for solar plus storage will reduce solar power costs. [Option ID = 93503]
3. All of these [Option ID = 93505]
4. Used car batteries will be used for solar applications. [Option ID = 93504]
Correct Answer :-

The use of electric vehicle batteries for solar plus storage will reduce solar power costs. [Option ID = 93503]
13)

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I. Generating clean renewable electricity is crucial for India where nearly 300 million people-about a quarter of its population-live without access to electricity. Today, India is one of the lowest per capita consumers of electricity in the world; even when people are connected to the electricity grid, they face frequent disruptions. Add to that the projected economic growth and the increase in population, and the demand for energy in India is expected to double by 2040.
According to Onno Ruhl, World Bank Country Director in India, with around 300 days of sunshine every year, India has among the best conditions in the world to harness solar energy. The rapid expansion of solar power can improve the quality of life for millions of Indians, especially for its poorest citizens. It can also create thousands of jobs in the solar industry and underpin progress in all areas of development, helping the country fulfill its dream of becoming the 'India of the future'.
But Energy storage systems play a vital role to enhance capacity firming and smoothing the variable and intermittent power output from solar plants. The need for Energy Storage is thus indispensable in lieu of growing share of solar power in India's energy basket.
With the year on year declining price trend of solar and energy storage technologies, the time is not very far when not only commercial and industrial customers but also residential customers would become prosumers where they will produce and consume the electricity in-house and this will be possible with the hybrid solution of solar and storage.
Another market, which will grow in the near future, will be second life of the battery where the batteries (after few modifications) from the electric vehicles after their life can be used for the solar applications which will further reduce the solution cost of solar plus storage.
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Why is the author optimistic that soon residential customers would become prosumers? [Question ID = 53377]
1. People are fast being drawn to the cheaper power source of solar energy. [Option ID = 93494]
2. Falling prices and better storage techniques will tempt people to be prosumers of solar energy. [Option ID = 93495]
3. Hybrid solution of solar and storage will make this possible. [Option ID = 93496]
4. All of these. [Option ID = 93497]
Correct Answer :-
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All of these. [Option ID = 93497]
Consider the following pseudocode that operates on a non-empty queue Q and uses a stack S
```
func(Queue *Q){
Stack S;
--- Content provided by FirstRanker.com ---
while(!isEmpty(Q)){
elem =dequeue(Q);
push(S,elem);
}
while(!isEmpty(S)){
--- Content provided by FirstRanker.com ---
elem =pop(S);
enqueue(Q,elem);
}
}
```
Then func does the following [Question ID = 53376]
1. Empties the input queue Q. [Option ID = 93491]
2. Reverses the input queue Q. [Option ID = 93493]
3. Doubles the number of elements in the input queue Q. [Option ID = 93492]
4. Keeps the input queue Q as it was before the function call. [Option ID = 93490]
Correct Answer :-

Reverses the input queue Q. [Option ID = 93493]
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Let <f_n> be a sequence of functions defined on [0, 1] as follows
```
n², if 0 = x = 1/(2n)
f_n(x) = -n²x+n, if 1/(2n) < x <= 1/n
0, if 1/n < x = 1
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```
Then f_n(x)? f(x) ? x ? [0, 1], which of the following is not satisfied? [Question ID = 2737]
1. Each f_n is a continuous function. [Option ID = 10945]
2. f is a continuous function. [Option ID = 10946]
3. ?₀¹f_n(x) dx = 1, 2, 3, ... [Option ID = 10947]
4. lim_n?8 ?₀¹f_n(x) dx = ?₀¹f(x) dx [Option ID = 10948]
Correct Answer :-
--- Content provided by‌ FirstRanker.com ---

lim_n?8 ?₀¹f_n(x) dx = ?₀¹f(x) dx [Option ID = 10948]
Let R be the set of real numbers and let T: R³ ? R⁴ be defined as T(x, y, z) = (x + y + z,x + 2y - 3z, 2x + 3y - 2z, 3x + 4y - z). Then rank of the linear transformation T is [Question ID = 2730]
1. 3 [Option ID = 10918]
2. 4 [Option ID = 10917]
3. 1 [Option ID = 10920]
4. 2 [Option ID = 10919]
Correct Answer :-

2 [Option ID = 10919]
17)
--- Content provided by FirstRanker.com ---
I. Generating clean renewable electricity is crucial for India where nearly 300 million people-about a quarter of its population-live without access to electricity. Today, India is one of the lowest per capita consumers of electricity in the world; even when people are connected to the electricity grid, they face frequent disruptions. Add to that the projected economic growth and the increase in population, and the demand for energy in India is expected to double by 2040.
According to Onno Ruhl, World Bank Country Director in India, with around 300 days of sunshine every year, India has among the best conditions in the world to harness solar energy. The rapid expansion of solar power can improve the quality of life for millions of Indians, especially for its poorest citizens. It can also create thousands of jobs in the solar industry and underpin progress in all areas of development, helping the country fulfill its dream of becoming the 'India of the future'.
But Energy storage systems play a vital role to enhance capacity firming and smoothing the variable and intermittent power output from solar plants. The need for Energy Storage is thus indispensable in lieu of growing share of solar power in India's energy basket.
With the year on year declining price trend of solar and energy storage technologies, the time is not very far when not only commercial and industrial customers but also residential customers would become prosumers where they will produce and consume the electricity in-house and this will be possible with the hybrid solution of solar and storage.
--- Content provided by‍ FirstRanker.com ---
Another market, which will grow in the near future, will be second life of the battery where the batteries (after few modifications) from the electric vehicles after their life can be used for the solar applications which will further reduce the solution cost of solar plus storage.
'India has among the best conditions in the world to harness solar energy' How? [Question ID = 2740]
1. It has 300 days of sunshine in a year. [Option ID = 10957]
2. All of these [Option ID = 10960]
3. One-fourth of its population live without access to electricity [Option ID = 10959]
4. Its per capita consumption of power is among the lowest in the world. [Option ID = 10958]
Correct Answer :-

It has 300 days of sunshine in a year. [Option ID = 10957]
18)

--- Content provided by⁠ FirstRanker.com ---

I. Generating clean renewable electricity is crucial for India where nearly 300 million people-about a quarter of its population-live without access to electricity. Today, India is one of the lowest per capita consumers of electricity in the world; even when people are connected to the electricity grid, they face frequent disruptions. Add to that the projected economic growth and the increase in population, and the demand for energy in India is expected to double by 2040.
According to Onno Ruhl, World Bank Country Director in India, with around 300 days of sunshine every year, India has among the best conditions in the world to harness solar energy. The rapid expansion of solar power can improve the quality of life for millions of Indians, especially for its poorest citizens. It can also create thousands of jobs in the solar industry and underpin progress in all areas of development, helping the country fulfill its dream of becoming the 'India of the future'.
But Energy storage systems play a vital role to enhance capacity firming and smoothing the variable and intermittent power output from solar plants. The need for Energy Storage is thus indispensable in lieu of growing share of solar power in India's energy basket.
With the year on year declining price trend of solar and energy storage technologies, the time is not very far when not only commercial and industrial customers but also residential customers would become prosumers where they will produce and consume the electricity in-house and this will be possible with the hybrid solution of solar and storage.
Another market, which will grow in the near future, will be second life of the battery where the batteries (after few modifications) from the electric vehicles after their life can be used for the solar applications which will further reduce the solution cost of solar plus storage.
--- Content provided by⁠ FirstRanker.com ---
Why is the need for Energy Storage indispensable? [Question ID = 2741]
1. Supply of conventional power is not reliable. [Option ID = 10961]
2. Even when people are connected to the electricity grid, they face frequent disruptions. [Option ID = 10962]
3. Presently, solar power supply is variable and intermittent. [Option ID = 10963]
4. Solar power may soon be a dominant player in the energy supply market. [Option ID = 10964]
Correct Answer :-
--- Content provided by‌ FirstRanker.com ---

Presently, solar power supply is variable and intermittent. [Option ID = 10963]
The distance between the planes 7.(i + 2j - 2k) + 5 = 0 and 7.(i + 2j - 2k) - 8 = 0 is: [Question ID = 2738]
1. 13 [Option ID = 10951]
2. 3 [Option ID = 10950]
3. 13/3 [Option ID = 10952]
4. 1 [Option ID = 10949]
Correct Answer :-

13/3 [Option ID = 10952]
20)
--- Content provided by‌ FirstRanker.com ---
Consider the following two functions. The time complexities of the two functions are
```
func1(int n)
{
if(n <= 1) return 1;
--- Content provided by FirstRanker.com ---
else return 2* func1(n - 1);
}
func2(int n)
{
if(n <= 1) return 1;
--- Content provided by FirstRanker.com ---
else return func2(n-1) + func2(n - 1);
}
```
[Question ID = 2757]
1. T(n) for func1 and T(2ⁿ) for func2. [Option ID = 11026]
2. T(n) for both func1 and func2. [Option ID = 11028]
3. T(n) for func2 and T(2ⁿ) for func1 [Option ID = 11027]
4. T(2ⁿ) for both func1 and func2. [Option ID = 11025]
Correct Answer :-

T(n) for func1 and T(2ⁿ) for func2. [Option ID = 11026]
The value of b such that the scalar product of the vector i+j+k with the unit vector parallel to the sum of the vectors 2i + 4j - 5k and bi + 2j + 3k equals one is [Question ID = 2739]
1. 1 [Option ID = 10956]
2. -2 [Option ID = 10953]
3. 0 [Option ID = 10955]
4. -1 [Option ID = 10954]
Correct Answer :-

1 [Option ID = 10956]
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The point (2, 1) to the curve (x - 2)² = y(y - 1)² is [Question ID = 2728]
1. a cusp [Option ID = 10910]
2. not even a double point [Option ID = 10912]
3. a conjugate point [Option ID = 10911]
4. a node [Option ID = 10909]
Correct Answer :-

a node [Option ID = 10909]
Let V = M_3x3 (R) and let T:V?V be defined by T(A) = A + A^t where A^t denotes the transpose of A. Number of distinct real eigen values of T is [Question ID = 2731]
1. 0 [Option ID = 10921]
2. 3 [Option ID = 10924]
3. 2 [Option ID = 10923]
4. 1 [Option ID = 10922]
Correct Answer :-

2 [Option ID = 10923]

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Suppose bool is a Boolean variable that can assume value 0 or 1. Then, the following code is equivalent to which of the given statements?
```
If (bool == 0)
bool = 1;
else
bool = 0;
--- Content provided by⁠ FirstRanker.com ---
```
[Question ID = 2763]
1. Bool = 1 + bool [Option ID = 11049]
2. 1- bool [Option ID = 11052]
3. 1% bool [Option ID = 11050]
4. bool -1 [Option ID = 11051]
Correct Answer :-
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Let f(x) = sin²(p/x), then lim_x?8 x²f(1/x) is equal to [Question ID = 2726]
1. 1/2 [Option ID = 10901]
2. 1 [Option ID = 10903]
3. p/4 [Option ID = 10902]
4. p/2 [Option ID = 10904]
Correct Answer :-

1 [Option ID = 10903]
The minimum number of comparisons required to determine if a given integer x appears more than n/2 times in a sorted array of n integers is [Question ID = 2755]
1. T(1) [Option ID = 11017]
2. ?(nlogn) [Option ID = 11020]
3. T(logn) [Option ID = 11018]
4. T(n) [Option ID = 11019]
Correct Answer :-

T(logn) [Option ID = 11018]

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27)
Consider a hash table of size seven, with starting index zero, which uses a hash function (2x + 5) mod 7 with open addressing and collisions resolved using linear probing. After inserting a set of values into the table, suppose the current content of the hash table at respective locations (starting from zero) is
```
14, 11, e, e, 10, 21, 4
```
where e denotes an empty location. What can be a possible order in which the entries are inserted into the hash table? [Question ID = 2751]
1. 11, 4, 14, 21, 10 [Option ID = 11004]
2. 4, 21, 14, 11, 10 [Option ID = 11001]
3. 4, 21, 11, 14, 10 [Option ID = 11002]

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This post was last modified on 29 January 2020

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