Quiz Space

January 2023 term · Modern Application Development II · BSCS2006

MAD 2 End Term: 30 April 2023, Set QPD1-S1 (January 2023 term)

The IIT Madras BS Modern Application Development II (MAD 2) End Term paper sat on 30 Apr 2023, in the January 2023 term, set QPD1-S1: 32 questions for 100 marks in 180 minutes. Every question is below with its answer. Take it as a timed mock test to be marked, or read it through first.

Questions
32
Marks
100
Duration
180 min
MSQ
11
MCQ
21
Take as mock testPractise with answers

Updated

Official paper: IIT M DIPLOMA ET1 EXAM QPD1 S2 30 Apr 2023 · No negative marking.

Question 1

+2 marksOne or more correct options

Which of the following statement(s) is/are true regarding javascript language?

Select all that apply.

  1. A

    Hoisting moves the declaration of arrow functions to the top of their scopes.

  2. B

    All 3 keywords, i.e., “var”, “let” and “const” can be used to declare global variables.

  3. C

    The functions are treated as first class citizens in the language.

  4. D

    Node.js is an example of a javascript engine.

Show answer

Correct answers

  • B

    All 3 keywords, i.e., “var”, “let” and “const” can be used to declare global variables.

  • C

    The functions are treated as first class citizens in the language.

Question 1 on its own page

Question 2

+2 marksOne or more correct options

Which of the following statement(s) is/are true about VueJS framework?

Select all that apply.

  1. A

    VueJS is a framework built on top of HTML, CSS and javascript.

  2. B

    VueJS is built on a component based architecture.

  3. C

    It cannot be installed/used via npm (node package manager).

  4. D

    All of these

Show answer

Correct answers

  • A

    VueJS is a framework built on top of HTML, CSS and javascript.

  • B

    VueJS is built on a component based architecture.

Question 2 on its own page

Question 3

+2 marksOne or more correct options

Select all that apply.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answers

  • A
  • C
Question 3 on its own page

Question 4

+2 marksOne or more correct options

Which of the following statement(s) is/are true about pub/sub messaging?

Select all that apply.

  1. A

    Publisher has to know about all the subscribers.

  2. B

    Publisher does not have to know about the subscribers.

  3. C

    Communication between publisher and subscribers is asynchronous.

  4. D

    Communication between publishers and subscribers is synchronous.

Show answer

Correct answers

  • B

    Publisher does not have to know about the subscribers.

  • C

    Communication between publisher and subscribers is asynchronous.

Question 4 on its own page

Question 5

+2 marksOne or more correct options

Which of the following statement(s) is/are true?

Select all that apply.

  1. A

    In short polling, the server does not respond until the data is available or the request times out.

  2. B

    In long polling, the server does not respond until the data is available or the request times out.

  3. C

    In short polling, the server responds immediately with or without data.

  4. D

    In long polling, the server responds immediately with or without data.

Show answer

Correct answers

  • B

    In long polling, the server does not respond until the data is available or the request times out.

  • C

    In short polling, the server responds immediately with or without data.

Question 5 on its own page

Question 6

+3 marksOne correct option

Which of the following shows the correct output if the javascript program written below is executed?

  1. A

    [25, 25, 49]

  2. B

    [25, 25]

  3. C

    25

  4. D

    25 25

Show answer

Correct answer

  • C

    25

Question 6 on its own page

Question 7

+3 marksOne correct option

Which of the following statements is true in the context of REST?

  1. A

    Both the HTTP request methods, “GET” and “POST” are idempotent.

  2. B

    In general, an HTTP “PUT” request is used to make incremental changes to an existing resource.

  3. C

    A “DELETE” request that randomly deletes a resource is idempotent.

  4. D

    None of these

Show answer

Correct answer

  • D

    None of these

Question 7 on its own page

Question 8

+3 marksOne correct option

Which of the following shows the correct output if the javascript program written below is executed?

javascript
async function demo () {
    let prom = await new Promise((res, rej) => {
        setTimeout(() => res(40), 2000)
    })
    console.log(prom)
    console.log("Statement 2") // Statement 2
    return prom
}


demo().then(result => console.log(result))
console.log("Statement 1") // Statement 1
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 8 on its own page

Question 9

+3 marksOne correct option

Which of the following statements is correct regarding Vue.js framework?

  1. A

    In Vue 2, the “el” property of the Vue constructor can be used to refer to an HTML element via an ID or a class.

  2. B

    The components of Vue must define “data” property as an object.

  3. C

    A Vue component cannot implement lifecycle hooks (i.e., created, mounted, etc.), if they are already implemented in the Vue instance.

  4. D

    All of these

Show answer

Correct answer

  • A

    In Vue 2, the “el” property of the Vue constructor can be used to refer to an HTML element via an ID or a class.

Question 9 on its own page

Question 10

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="app.js" type="module"></script>
</body>

app.js:

javascript
const Player = {
  template: `<div><div>{{striker.name}}*</div>
  <div>{{nonStriker.name}}</div>
  </div>`,
  data() {
    return {
      player1: {name: 'Rohit'},
      player2: {name: 'Virat'},
    }
  },
  props: {
    run: { type: Number, default: 0 },
  },
  computed: {
    striker() {
      return this.run % 2 == 0 ? this.player1 : this.player2
    },
    nonStriker() {
      return this.run % 2 == 1 ? this.player1 : this.player2
    },
  },
}


const Run = {
  template: `<button @click="$emit('run-changed',
run)">{{run}}</button>`,
  props: { run: Number },
}


new Vue({
  el: '#app',
  template: `<div>
                <Player :run='score'/>
                <div style='display: flex'>
                    <Run :run="3" @run-changed = 'runChanged'/>
                    <Run :run="4" @run-changed = 'runChanged' />
                </div>
             </div>`,
  components: { Run, Player },
  data: {
    score: 0,
  },
  methods: {
    runChanged(run) {
      this.score = run
    },
  },
})

Suppose the user clicks on the buttons with text “4” and then “3”. What will be rendered inside the Player component?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 10 on its own page

Question 11

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script
src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="app.js" type="module"></script>

app.js:

javascript
const data = {
  1: { totalRun: 1000, totalMatches: 20 },
  2: { totalRun: 7000, totalMatches: 100 },
}
const NotFound = { template: `<div> Player Not Found</div>` }
const Profile = {
  template: `<div>Run: {{stat.totalRun}}, Matches:
{{stat.totalMatches}}, Average: {{average}}</div>`,
  data() {
    return {
      stat: data[this.$route.params.id],
    }
  },
  computed: {
    average() {
      return this.stat.totalRun / this.stat.totalMatches
    },
  },
}
const router = new VueRouter({
  routes: [
    { path: '/profile/:id', component: Profile },
    { path: '*', component: NotFound },
  ],
})


new Vue({
  el: '#app',
  template: '<div><router-view /></div>',
  router,
})

Suppose the application is running on “http://127.0.0.1:8080”. What will be rendered inside the “router-view” component for the URL “http://127.0.0.1:8080/#/”?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 11 on its own page

Question 12

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script
src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="app.js" type="module"></script>

app.js:

javascript
const data = {
  1: { totalRun: 1000, totalMatches: 20 },
  2: { totalRun: 7000, totalMatches: 100 },
}
const NotFound = { template: `<div> Player Not Found</div>` }
const Profile = {
  template: `<div>Run: {{stat.totalRun}}, Matches:
{{stat.totalMatches}}, Average: {{average}}</div>`,
  data() {
    return {
      stat: data[this.$route.params.id],
    }
  },
  computed: {
    average() {
      return this.stat.totalRun / this.stat.totalMatches
    },
  },
}
const router = new VueRouter({
  routes: [
    { path: '/profile/:id', component: Profile },
    { path: '*', component: NotFound },
  ],
})


new Vue({
  el: '#app',
  template: '<div><router-view /></div>',
  router,
})

Suppose the application is running on “http://127.0.0.1:8080”. What will be displayed for the URL “http://127.0.0.1:8080/#/profile/2”?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 12 on its own page

Question 13

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script
src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="app.js" type="module"></script>
  </body>

app.js:

javascript
const overs = {
  1: [2, 3, 4, 6, 2],
  2: [3, 2, 5, 3, 1],
}


const NotFound = { template: `<div> Over Not Found</div>` }
const MatchNotStarted = { template: `<div>Match has not yet started.
</div>` }


const currentOver = {
  template: `<div style='display: flex'>
<div v-for='run in over' style='padding: 10px'>{{run}}</div>
</div>`,
  data() {
    return {
      over: overs[this.$route.params.overNo]
        ? overs[this.$route.params.overNo]
        : overs[2],
    }
  },
}


const liveScore = {
  template: `<div>Total Score:{{totalScore}} <router-view /></div>`,
  data() {
    return {
      totalScore: 100,
    }
  },
}
const router = new VueRouter({
  routes: [
    {
      path: '/live-score',
      component: liveScore,
      children: [
        { path: '', component: MatchNotStarted },
        { path: 'over/:overNo', component: currentOver },
      ],
    },
  ],
})


new Vue({
  el: '#app',
  template: `<div><router-view /></div>`,
  router,
})

Suppose the application is running on “http://127.0.0.1:8080”. What will be rendered in the “router-view” component of the “live-score” component for URL “http://127.0.0.1:8080/#/live-score”?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 13 on its own page

Question 14

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script
src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="app.js" type="module"></script>
  </body>

app.js:

javascript
const overs = {
  1: [2, 3, 4, 6, 2],
  2: [3, 2, 5, 3, 1],
}


const NotFound = { template: `<div> Over Not Found</div>` }
const MatchNotStarted = { template: `<div>Match has not yet started.
</div>` }


const currentOver = {
  template: `<div style='display: flex'>
<div v-for='run in over' style='padding: 10px'>{{run}}</div>
</div>`,
  data() {
    return {
      over: overs[this.$route.params.overNo]
        ? overs[this.$route.params.overNo]
        : overs[2],
    }
  },
}


const liveScore = {
  template: `<div>Total Score:{{totalScore}} <router-view /></div>`,
  data() {
    return {
      totalScore: 100,
    }
  },
}
const router = new VueRouter({
  routes: [
    {
      path: '/live-score',
      component: liveScore,
      children: [
        { path: '', component: MatchNotStarted },
        { path: 'over/:overNo', component: currentOver },
      ],
    },
  ],
})


new Vue({
  el: '#app',
  template: `<div><router-view /></div>`,
  router,
})

Suppose the application is running on “http://127.0.0.1:8080”. What will be rendered in the “router-view” component of the “live-score” component for URL “http://127.0.0.1:8080/#/live-score/over/1”?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 14 on its own page

Question 15

+3 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script
src="https://unpkg.com/vue-router@3.0.0/dist/vue-router.js"></script>
    <script src="app.js" type="module"></script>
  </body>

app.js:

javascript
const overs = {
  1: [2, 3, 4, 6, 2],
  2: [3, 2, 5, 3, 1],
}


const NotFound = { template: `<div> Over Not Found</div>` }
const MatchNotStarted = { template: `<div>Match has not started yet</div>` }
const currentOver = {
  template: `<div style='display: flex'>
<div v-for='run in over' style='padding: 10px'>{{run}}</div>
</div>`,
  data() {
    return {
      over: overs[this.$route.params.overNo]
        ? overs[this.$route.params.overNo]
        : overs[2],
    }
  },
}


const liveScore = {
  template: `<div>Total Score:{{totalScore}} <router-view /></div>`,
  data() {
    return {
      totalScore: 100,
    }
  },
}
const router = new VueRouter({
  routes: [
    {
      path: '/live-score',
      component: liveScore,
      children: [
        { path: '', component: MatchNotStarted },
        { path: 'over/:overNo', component: currentOver },
      ],
    },
    {
      path: '*',
      component: NotFound,
    },
  ],
})


new Vue({
  el: '#app',
  template: `<div><router-view /></div>`,
  router,
})

Suppose the application is running on “http://127.0.0.1:8080”. What will be rendered in the “router-view” component of the “root” component for URL “http://127.0.0.1:8080/#/over/1”?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • D
Question 15 on its own page

Question 16

+3 marksOne or more correct options

Which of the following is/are the correct ways to always apply “errorClass”, but “activeClass” should only be applied when the Vue data variable “isActive” is truthy?

Select all that apply.

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answers

  • A
  • B
Question 16 on its own page

Question 17

+3 marksOne or more correct options

Which of the following statement(s) is/are correct regarding Vuex?

Select all that apply.

  1. A

    A Vuex store provides a single source of truth that can drive the application.

  2. B

    It provides a variable named “this.$vuexstore” to allow components to access the store data.

  3. C

    A component cannot have its own local state, if the application uses Vuex.

  4. D

    The mutations and actions are some constructs of a Vuex store.

Show answer

Correct answers

  • A

    A Vuex store provides a single source of truth that can drive the application.

  • D

    The mutations and actions are some constructs of a Vuex store.

Question 17 on its own page

Question 18

+3 marksOne or more correct options

Which of the following statement(s) is/are true regarding forward and reverse proxy?

Select all that apply.

  1. A

    A forward proxy is used to protect the server(s) from the outside world.

  2. B

    A reverse proxy can be used to cache the responses, and reuse for similar subsequent requests.

  3. C

    A load balancer becomes irrelevant, where there is not more than 1 server.

  4. D

    All of these

Show answer

Correct answers

  • B

    A reverse proxy can be used to cache the responses, and reuse for similar subsequent requests.

  • C

    A load balancer becomes irrelevant, where there is not more than 1 server.

Question 18 on its own page

Question 19

+3 marksOne or more correct options

Suppose you are building an application which requires sending emails to all the users stored in the database at regular intervals. Given below are the two approaches to satisfy the requirement.

Approach 1:

python
@celery.task
def send_bulk_emails():
    all_users = User.query.all() // Get all the user objects from the
database
    for user in all_users:
        // send email to the user


send_bulk_emails.delay() // invokes celery task

Approach 2:

python
@celery.task
def send_email(email):
    // send email to the user


all_users = User.query.all() // Get all the user objects from the database
for user in all_users:
        send_email.delay(user.email) // invokes celery task

Choose the correct statement(s).

Select all that apply.

  1. A

    Approach 1 will take more time than approach 2, if more than 2 celery workers are available.

  2. B

    Approach 2 will take more time than approach 1, if more than 2 celery workers are available.

  3. C

    Both the approaches will take same time (approx), if only 1 celery worker is available.

  4. D

    None of these

Show answer

Correct answers

  • A

    Approach 1 will take more time than approach 2, if more than 2 celery workers are available.

  • C

    Both the approaches will take same time (approx), if only 1 celery worker is available.

Question 19 on its own pageAlso asked in End Term 30 Apr 2023

Question 20

+3 marksOne or more correct options

Which of the following is/are the potential benefits of using a message broker?

Select all that apply.

  1. A

    A message broker allows two servers in a network to directly communicate with each other, without an intermediary.

  2. B

    A message broker makes the network scalable for adding more servers to the network.

  3. C

    A message broker can be used for batch processing of messages.

  4. D

    A message broker is well suited in case of traffic spikes, as messages are retained in the queue until processed.

Show answer

Correct answers

  • B

    A message broker makes the network scalable for adding more servers to the network.

  • C

    A message broker can be used for batch processing of messages.

  • D

    A message broker is well suited in case of traffic spikes, as messages are retained in the queue until processed.

Question 20 on its own page

Question 21

+3 marksOne or more correct options

Which of the following statement(s) is correct regarding the prototype in JavaScript?

Select all that apply.

  1. A

    Every constructor function has a property named ‘prototype’.

  2. B

    Any object created using the new keyword and the constructor function, will inherit from the constructor's prototype object.

  3. C

    Prototype of an object can be accessed using the ‘__proto__’ property of the object.

  4. D

    The prototype of an object can be accessed using the ‘prototype’ property of the object.

Show answer

Correct answers

  • A

    Every constructor function has a property named ‘prototype’.

  • B

    Any object created using the new keyword and the constructor function, will inherit from the constructor's prototype object.

  • C

    Prototype of an object can be accessed using the ‘__proto__’ property of the object.

Question 21 on its own page

Question 22

+4.5 marksOne correct option

Consider the following Vue application with markup “index.html” and javascript file “app.js”.

index.html:

html
<div id = "app">
    <my-comp>
        <template #header>
            This is header content
        </template>


        <template #footer>
            This is footer content
        </template>


        <p> This is some content </p>
    </my-comp>
</div>
<script src = "app.js"> </script>

app.js:

javascript
Vue.component("myComp", {
    template : `<div>
                    <p>
                        <slot></slot>
                    </p>
                    <p>
                        <slot name="header"></slot>
                    </p>
                </div>
                `,
})


const app = new Vue({
    el : "#app",
})

Suppose you open the “index.html” file in a browser. What will be rendered by the browser?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • D
Question 22 on its own page

Question 23

+4.5 marksOne correct option

Consider the following javascript program, and predict the output if executed.

javascript
new Promise((str1, str2) => {
    if (5 == "5") str1(5)
    else str2(8)
}).
then(d => {
    console.log("Checkpoint 4", d);
    throw new Error(20);
    return d * 5;
})
.then(d => {
    console.log("Checkpoint 2", d);
    return d;
}, d => {
    console.log("Checkpoint 5", d.message);
    return d.message * 2;
}).catch(e => {
    console.log("Checkpoint 3", e.message);
    return e.message * 2;
}).finally(d => {
    console.log("Checkpoint 1", d);
    return d * 5;
}).then(d => {
    console.log("Checkpoint 6", d);
    return d * 5;
})
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • B
Question 23 on its own page

Question 24

+4.5 marksOne correct option

Consider the following Vue application with markup “index.html” and javascript file “app.js”.

index.html:

html
<div id = "app">
    <input v-model = "text" @input = "save_data">
    <p> {{content}} </p>
</div>
<script scr = "app.js"></script>

app.js:

javascript
new Vue({
    el : "#app",
    data : {
        text : "",
        content : "",
    },


    mounted () {
        try {
            this.text = localStorage.getItem("value1").split("abhi").slice(1,
-1),join("");
            this.content =
localStorage.getItem("value1").split("abhi").slice(1),join("");
        }
        catch {
            this.text = "";
            this.content = "";
        }
    },


    methods : {
        save_data() {
            localStorage.setItem("value1", this.text);
            localStorage.setItem("value2", this.content);
        }
    }
})

Suppose you open “index.html” file in a browser, and type the text “abhishekabhinavabhi” in the text box shown (after removing the previous text, if any), and hard refresh the page twice, without clicking anywhere. What will be the value shown in the text box, and the “age” placeholder, respectively?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 24 on its own page

Question 25

+4.5 marksOne correct option

Which of the following shows the correct output if the javascript program written below is executed?

javascript
let num = 50


const a = {
    num : 10,
    func : function (num) {
        console.log("Function A:", this.num)
    }
}


const b = {
    num : 20,
    func : function () {
        console.log("Function B:", this.num)
        a.func.bind(this)(num = 40)
    }
}


b.func.apply(a, [40])
  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 25 on its own page

Question 26

+4.5 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="app.js" type="module"></script>
</body>

app.js:

javascript
new Vue({
  el: '#app',
  template: `<div>
  <ol type='1'>
    <li v-for='fruit in fruits'>{{fruit}}</li>
  </ol>
</div>`,
  data: {
    fruits: ['Banana', 'Mango'],
  },
  beforeCreate() {
    this.fruits.push('Orange')
  },
  created() {
    this.fruits.push('Apple')
  },
})

Suppose you open the file “index.html” in a browser. What will be rendered by the browser?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • C
Question 26 on its own page

Question 27

+4.5 marksOne correct option

Consider the below application with markup “index.html” and javascript file “app.js”.

index.html:

html
<body>
    <div id="app"></div>
    <script
src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script src="app.js" type="module"></script>
  </body>

app.js:

javascript
const Player = {
  template: `<div style='background-color:red'><slot></slot></div>`,
  data() {
    return {
      scores: [
        { name: 'Rohit', run: 50 },
        { name: 'Virat', run: 20 },
      ],
    }
  },
}


new Vue({
  el: '#app',
  template: `<div>
               <h1> Score Board</h1>
               <Player>
                 <ol type='1'>
                   <li v-for='score in scores'>{{score.name}}:
{{score.run}}</li>
                 </ol>
               </Player>
             </div>`,
  data: {
    scores: [
      { name: 'Rohit', run: 20 },
      { name: 'Virat', run: 50 },
    ],
  },
  components: {
    Player,
  },
})

Suppose you open the file “index.html” in a browser. What will be rendered inside the slot, by the browser?

  1. A
  2. B
  3. C
  4. D
Show answer

Correct answer

  • A
Question 27 on its own page

Question 28

+4.5 marksOne correct option

Consider the below flask application.

app.py:

python
from flask import Flask
from flask_caching import Cache
from time import sleep


config = {
    "CACHE_TYPE": "RedisCache",
    "CACHE_REDIS_URL": 'redis://localhost:6379/1'
}


app = Flask(__name__)
app.config.from_mapping(config)
cache = Cache(app)




@cache.memoize(timeout=120)
def get_score(name):
    sleep(10)
    return 0


@app.route('/match/<int:match_id>/player/<name>/score')
def score(match_id, name):
    score = get_score(name)
    return f"IND Vs AUS- SKY: {score}"






if __name__ == '__main__':
    app.run(debug=True)

If the Redis server is running on “localhost:6379” and application is running on “http://127.0.0.1:5000”. If User visits the URL “http://127.0.0.1:5000/match/1/player/sky/score” twice within 2 minutes. What will be the approximate absolute difference between the response time of the requests?

  1. A

    10 seconds

  2. B

    0 seconds

  3. C

    20 seconds

  4. D

    120 Seconds

Show answer

Correct answer

  • A

    10 seconds

Question 28 on its own page

Question 29

+4.5 marksOne correct option

Consider the below flask application.

app.py:

python
from flask import Flask
from flask_caching import Cache
from time import sleep


config = {
    "CACHE_TYPE": "RedisCache",
    "CACHE_REDIS_URL": 'redis://localhost:6379/1'
}


app = Flask(__name__)
app.config.from_mapping(config)
cache = Cache(app)




@cache.memoize(timeout=120)
def get_score(name):
    sleep(10)
    return 0




@app.route('/match/<int:match_id>/player/<name>/score')
def score(match_id, name):
    score = get_score(name)
    return f"IND Vs AUS- SKY: {score}"






if __name__ == '__main__':
    app.run(debug=True)

If the Redis server is running on “localhost:6379” and application is running on “http://127.0.0.1:5000”. If User visits the URL “http://127.0.0.1:5000/match/1/player/sky/score” first and then “http://127.0.0.1:5000/match/1/player/rohit/score” within 2 minutes. What will be the approximate absolute difference between the response time of the requests?

  1. A

    10 seconds

  2. B

    0 seconds

  3. C

    20 seconds

  4. D

    120 Seconds

Show answer

Correct answer

  • B

    0 seconds

Question 29 on its own page

Question 30

+2 marksOne correct option

Which of the following statements is true regarding webhooks?

  1. A

    A webhook should deliver data to other apps, as it happens.

  2. B

    A webhook is primarily meant for a server to server communication.

  3. C

    A webhook typically uses an HTTP POST request to deliver the response.

  4. D

    All of these

Show answer

Correct answer

  • D

    All of these

Question 30 on its own page

Question 31

+2 marksOne correct option

Which of the following statements is true about cookies and CORS?

  1. A

    A session cookie expires as soon as the application tab is closed, and not the browser.

  2. B

    The CORS mechanism reduces the chances of malicious actions by explicitly saying which URLs can be the originators of data.

  3. C

    A browser sandbox causes any browser based malware to directly affect the user’s system.

  4. D

    All of these

Show answer

Correct answer

  • B

    The CORS mechanism reduces the chances of malicious actions by explicitly saying which URLs can be the originators of data.

Question 31 on its own page

Question 32

+2 marksOne correct option

Suppose an endpoint in your flask application triggers a celery task, which generates a CSV file named “data.csv” and saves it in the static folder of a flask application. The file generator takes anywhere between 20 and 40 seconds to generate and save the CSV file.

The below fetch call is used to get the file generated by the above explained celery task.

javascript
fetch("/static/data.csv").then(response => response.blob()
).then(data => {
    // does something with the response data
})

Which of the following is the most efficient way to make the above fetch call so that it doesn’t fail and return the desired response?

  1. A

    Use short polling to check the state of the celery task after every 5 seconds, and make the fetch call, when the task succeeds.

  2. B

    Use javascript function “setTimeout” to make the fetch after 41 seconds, which makes sure that the file is generated and saved to the desired location.

Show answer

Correct answer

  • A

    Use short polling to check the state of the celery task after every 5 seconds, and make the fetch call, when the task succeeds.

Question 32 on its own page