JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 279 · 40 questions

Code tip (Line by line): let x = 5; makes a variable x holding 5; x = x + 2; changes it to 7. console.log(…) writes in the console; alert(…) shows a pop-up box. Text in quotes + anything = joined text: "5" + 3 → "53".

1. 1.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
2. 2.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) alert() (d) if
3. 3.⚡ What number does this code print?
   let books = 26;
   books = books + 6;
   books = books - 7;
   console.log(books);
4. 4.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, name! (d) Hello, Zoya!
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) 51 (b) Error (c) 6
8. 8.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) let
9. 9.⚡ What number does this code print?
   let a = 49;
   let b = 26;
   console.log(a - b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) Error (b) 27 (c) 9
11. 11.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) name (d) Kabir
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
14. 14.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
15. 15.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) alert()
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
17. 17.⚡ What number does this code print?
    let score = 29;
    score = score + 9;
    score = score - 35;
    console.log(score);
18. 18.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, Meera! (d) Hello, name!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) 53 (c) Error
21. 21.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
24. 24.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 18;
    runs = runs - 27;
    console.log(runs);
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
26. 26.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
27. 27.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
28. 28.⚡ What number does this code print?
    let a = 47;
    let b = 40;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 33;
    let b = 6;
    console.log(a + b);
30. 30.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Riya (d) Welcome, Riya!
32. 32.⚡ What number does this code print?
    let a = 37;
    let b = 34;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 9;
    coins = coins - 2;
    console.log(coins);
34. 34.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 4;
    marks = marks - 25;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 4;
    apples = apples - 17;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 6;
    let b = 32;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 20;
    marks = marks - 18;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let books = 24;
    books = books + 17;
    books = books - 17;
    console.log(books);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name

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