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## Delhi University MCA Previous Year Questions (PYQs)

#### Delhi University MCA 2019 PYQ

Delhi University MCA PYQ 2019
The system of linear equations  has

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

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Delhi University MCA PYQ 2019
The complex number  is the root of the quadratic equation with real coefficients

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Delhi University MCA PYQ 2019
The locus of the point (α, β) such that the line y = αx + β, become a tangent to the hyperbola  9x- 4x = 36, is

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Delhi University MCA PYQ 2019
Which of the following is not correct statement?

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Delhi University MCA PYQ 2019
Let T = R3→R3 be a linear transformation defined by T(x,y,x) = (x-y, y-z, z-x). If rank(T) = ρ and nulity(T)=

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Delhi University MCA PYQ 2019
The area (in squares units) of the quadrilateral formed by the tangent lines drawn to the ellipse  at the ends of its two latus rectums is

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Delhi University MCA PYQ 2019
Let V=M2(R) denote the vector space 2x2 matrices with real entries over the field. Let T:V→V be defined by T(P) = Pt for any P∈V, where Pt is the transpose of P. If E is the matrix representation of T with respect to the standard basis of V the det(E) is equal to

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Delhi University MCA PYQ 2019
The equation 2x2 + y2 - 12x - 4y + 16 = 0 represents

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Delhi University MCA PYQ 2019
If f(x) = ax3 + bx2 + x + 1 has a local maxima value 3 at the point of local maxima x = - 2, then f(2) is equal to :

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Delhi University MCA PYQ 2019
If the Newton-Raphson method is applied to find a real root of  f(x) = 2x2 + x - 2 = 0 with initial approximation x0 = 1. Then the second approximation xis

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Delhi University MCA PYQ 2019
The equation of common tangent to the curve y2 = 8x and xy = - 1 is

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Delhi University MCA PYQ 2019
The greatest value of the function  y = sin x . sin2x on (-∞, +∞)

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Delhi University MCA PYQ 2019
Let f(x) = sin8x + cos8x. Then the function f increases in the interval

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Delhi University MCA PYQ 2019
The area of the plane region by the curves x + 2y2 = 0 and x + 3y2 = 1 above x axis is equal to

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Delhi University MCA PYQ 2019
The perimeter of the loop of the curve 9y= (x-y)(x-5)2

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Delhi University MCA PYQ 2019
I'd been working with plastic bags, which I cut up and sew back together as my primary material for my artwork for the last 20 years. I turn them into two and three-dimensional pieces and sculptures and installations. After about the first eight years, some of my work started to fissure and break down into smaller little bits of plastic. It's a bad thing that plastic breaks down into smaller little bits, because it's always still plastic. And a lot of it is in the marine environment. I learned about the Pacific garbage patch. I wanted to go out there, pick up the plastic, and cold mold it into bricks to be used as building materials in underdeveloped communities. But soon I realized that I needed to look at the bigger picture first: we need to attack the source of this waste that is entering the marine environment every day on a global scale. Rather marine environment every day on a global scale. Rather than the marine plastic pile what I should focus on, is the pile of plastic in the supermarket. I'd go to the supermarket and all of my food is packaged in plastic. I'm concerned about the plastic and the toxins that leach from plastic into us and into our bodies.
How did the writer come to be concerned about plastic waste?

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
I'd been working with plastic bags, which I cut up and sew back together as my primary material for my artwork for the last 20 years. I turn them into two and three-dimensional pieces and sculptures and installations. After about the first eight years, some of my work started to fissure and break down into smaller little bits of plastic. It's a bad thing that plastic breaks down into smaller little bits, because it's always still plastic. And a lot of it is in the marine environment. I learned about the Pacific garbage patch. I wanted to go out there, pick up the plastic, and cold mold it into bricks to be used as building materials in underdeveloped communities. But soon I realized that I needed to look at the bigger picture first: we need to attack the source of this waste that is entering the marine environment every day on a global scale. Rather marine environment every day on a global scale. Rather than the marine plastic pile what I should focus on, is the pile of plastic in the supermarket. I'd go to the supermarket and all of my food is packaged in plastic. I'm concerned about the plastic and the toxins that leach from plastic into us and into our bodies.
What does he mean by “the bigger picture”?

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
I'd been working with plastic bags, which I cut up and sew back together as my primary material for my artwork for the last 20 years. I turn them into two and three-dimensional pieces and sculptures and installations. After about the first eight years, some of my work started to fissure and break down into smaller little bits of plastic. It's a bad thing that plastic breaks down into smaller little bits, because it's always still plastic. And a lot of it is in the marine environment. I learned about the Pacific garbage patch. I wanted to go out there, pick up the plastic, and cold mold it into bricks to be used as building materials in underdeveloped communities. But soon I realized that I needed to look at the bigger picture first: we need to attack the source of this waste that is entering the marine environment every day on a global scale. Rather marine environment every day on a global scale. Rather than the marine plastic pile what I should focus on, is the pile of plastic in the supermarket. I'd go to the supermarket and all of my food is packaged in plastic. I'm concerned about the plastic and the toxins that leach from plastic into us and into our bodies.
Why does author want to go to the Pacific?

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
I'd been working with plastic bags, which I cut up and sew back together as my primary material for my artwork for the last 20 years. I turn them into two and three-dimensional pieces and sculptures and installations. After about the first eight years, some of my work started to fissure and break down into smaller little bits of plastic. It's a bad thing that plastic breaks down into smaller little bits, because it's always still plastic. And a lot of it is in the marine environment. I learned about the Pacific garbage patch. I wanted to go out there, pick up the plastic, and cold mold it into bricks to be used as building materials in underdeveloped communities. But soon I realized that I needed to look at the bigger picture first: we need to attack the source of this waste that is entering the marine environment every day on a global scale. Rather marine environment every day on a global scale. Rather than the marine plastic pile what I should focus on, is the pile of plastic in the supermarket. I'd go to the supermarket and all of my food is packaged in plastic. I'm concerned about the plastic and the toxins that leach from plastic into us and into our bodies.
What does the author find in supermarket?

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
Recycling – everybody kind of ends their books about being sustainable and greening with the idea of recycling. You put something in a bin and you don't have to think about it again. What is the reality of that? In the United States, less than seven percent of the plastics are recycled, or incinerated, or shipped to China. It is down-cycled and turned into lesser things -- a plastic bottle can never be a plastic bottle again. We, a group of people concerned about plastic pollution, have added a fourth R onto the front of the "Reduce, Reuse, Recycle," and that is refuse. Whenever possible, refuse single-use and disposable plastics. Alternatives exist; I myself am now collecting these cool Pyrex containers and using those instead of plastic containers to store food in. And I know that I am doing a service to myself and my family. It is a problem that we've created as consumers and we have to solve it –We can solve this by raising awareness of the issue and teaching people to choose alternatives.
Why does the author think recycling is not the right solution?

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Delhi University MCA PYQ 2019
Recycling – everybody kind of ends their books about being sustainable and greening with the idea of recycling. You put something in a bin and you don't have to think about it again. What is the reality of that? In the United States, less than seven percent of the plastics are recycled, or incinerated, or shipped to China. It is down-cycled and turned into lesser things -- a plastic bottle can never be a plastic bottle again. We, a group of people concerned about plastic pollution, have added a fourth R onto the front of the "Reduce, Reuse, Recycle," and that is refuse. Whenever possible, refuse single-use and disposable plastics. Alternatives exist; I myself am now collecting these cool Pyrex containers and using those instead of plastic containers to store food in. And I know that I am doing a service to myself and my family. It is a problem that we've created as consumers and we have to solve it –We can solve this by raising awareness of the issue and teaching people to choose alternatives.
Mark the statement that is NOT true:

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
Recycling – everybody kind of ends their books about being sustainable and greening with the idea of recycling. You put something in a bin and you don't have to think about it again. What is the reality of that? In the United States, less than seven percent of the plastics are recycled, or incinerated, or shipped to China. It is down-cycled and turned into lesser things -- a plastic bottle can never be a plastic bottle again. We, a group of people concerned about plastic pollution, have added a fourth R onto the front of the "Reduce, Reuse, Recycle," and that is refuse. Whenever possible, refuse single-use and disposable plastics. Alternatives exist; I myself am now collecting these cool Pyrex containers and using those instead of plastic containers to store food in. And I know that I am doing a service to myself and my family. It is a problem that we've created as consumers and we have to solve it –We can solve this by raising awareness of the issue and teaching people to choose alternatives.
What service is writer doing to his family?

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Delhi University MCA PYQ 2019
Milk contains a type of sugar called lactose. When we are babies, our bodies make a special enzyme called lactase that allows us to digest the lactose in our mother‟s milk. But after we are weaned in early childhood, for many people this stops. Without lactase, we cannot properly digest the lactose in milk. But then evolution kicked in: some people began to keep their lactase enzymes active into adulthood. This “lactase persistence” allowed them to drink milk without side effects. It is the result of mutations in a section of DNA that controls the activity of the lactase gene. But in many populations, such as those in Africa, in Asia and South America, the trait is uncommon. Even people who are lactase-non-persistent exploit the option of processing milk into butter, yoghurt, cream or cheese – all of which have reduced amount of lactose. There is clearly a pattern behind which populations evolved high levels of lactase persistence and which didn‟t, says a genetics professor Dallas Swallow of University College London. Those with the trait are pastoralists: people who raise livestock. Hunter-gatherers, who do not keep animals, did not acquire the mutations. Neither did “forest gardeners” who cultivated plants. But milk consumption is going down, says a study. Statistics tell a different story. While milk consumption has fallen in the US, in Asia demand is growing, where most people are non-lactase-persistent. Whatever advantages the people there see in milk, they outweigh the potential digestive issues or the need to process the milk.
Why is it that some grownups can drink and digest milk while others cannot digest it?

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

#### Solution

Delhi University MCA PYQ 2019
Milk contains a type of sugar called lactose. When we are babies, our bodies make a special enzyme called lactase that allows us to digest the lactose in our mother‟s milk. But after we are weaned in early childhood, for many people this stops. Without lactase, we cannot properly digest the lactose in milk. But then evolution kicked in: some people began to keep their lactase enzymes active into adulthood. This “lactase persistence” allowed them to drink milk without side effects. It is the result of mutations in a section of DNA that controls the activity of the lactase gene. But in many populations, such as those in Africa, in Asia and South America, the trait is uncommon. Even people who are lactase-non-persistent exploit the option of processing milk into butter, yoghurt, cream or cheese – all of which have reduced amount of lactose. There is clearly a pattern behind which populations evolved high levels of lactase persistence and which didn‟t, says a genetics professor Dallas Swallow of University College London. Those with the trait are pastoralists: people who raise livestock. Hunter-gatherers, who do not keep animals, did not acquire the mutations. Neither did “forest gardeners” who cultivated plants. But milk consumption is going down, says a study. Statistics tell a different story. While milk consumption has fallen in the US, in Asia demand is growing, where most people are non-lactase-persistent. Whatever advantages the people there see in milk, they outweigh the potential digestive issues or the need to process the milk.
How did some populations come to retain lactase-persistence while very many others did not as they grew up?

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Delhi University MCA PYQ 2019
Milk contains a type of sugar called lactose. When we are babies, our bodies make a special enzyme called lactase that allows us to digest the lactose in our mother‟s milk. But after we are weaned in early childhood, for many people this stops. Without lactase, we cannot properly digest the lactose in milk. But then evolution kicked in: some people began to keep their lactase enzymes active into adulthood. This “lactase persistence” allowed them to drink milk without side effects. It is the result of mutations in a section of DNA that controls the activity of the lactase gene. But in many populations, such as those in Africa, in Asia and South America, the trait is uncommon. Even people who are lactase-non-persistent exploit the option of processing milk into butter, yoghurt, cream or cheese – all of which have reduced amount of lactose. There is clearly a pattern behind which populations evolved high levels of lactase persistence and which didn‟t, says a genetics professor Dallas Swallow of University College London. Those with the trait are pastoralists: people who raise livestock. Hunter-gatherers, who do not keep animals, did not acquire the mutations. Neither did “forest gardeners” who cultivated plants. But milk consumption is going down, says a study. Statistics tell a different story. While milk consumption has fallen in the US, in Asia demand is growing, where most people are non-lactase-persistent. Whatever advantages the people there see in milk, they outweigh the potential digestive issues or the need to process the milk.
Mark the statement that is NOT true:

Delhi University MCA Previous Year PYQDelhi University MCA DU MCA 2019 PYQ

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Delhi University MCA PYQ 2019
Which of the following operands have equal precedence, in C programming language?
I.       [ ]
II.       &
III.      <=
IV.      ( )

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Delhi University MCA PYQ 2019
The operator a << b shifts binary representation of integer „a‟ by „b‟ bit ________ , in C programming language.

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Delhi University MCA PYQ 2019
Two‟s complement of 00000000 is

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Delhi University MCA PYQ 2019
main()
{
int i = 4;
int j = 10;
Statements of the program
if ( i > 0)
{
int i = 44;
Statements of the program
}
}

Given
I. The local value of I is 44
II. The global value of I is 4 then

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Delhi University MCA PYQ 2019
X works twice as fast as Y . Y alone can finish the work in nine days . X and Y together can finish the work in _____ days.

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Delhi University MCA PYQ 2019
Average of ten numbers in a list is 25.If one of the numbers in the list is exchanged with another number the average of the new list increases by 5. What is the new number included in the list , if the original number was 15?

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Delhi University MCA PYQ 2019
How much of acid is in the 10 liter of a 60% solution, of acid and water solution?

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Delhi University MCA PYQ 2019
What is the next term in the series? 2, 7, 14, 23, 34, ______

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Delhi University MCA PYQ 2019
The code of DOG is ITL , what is the code of ITL?

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#### Delhi University MCA

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