JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 994 · 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.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) 43 (b) 7 (c) Error
3. 3.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
4. 4.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
5. 5.⚡ What number does this code print?
   let a = 10;
   let b = 3;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let score = 5;
   score = score + 16;
   score = score - 13;
   console.log(score);
7. 7.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Meera (c) Hi, name! (d) name
8. 8.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) Well done, name! (d) name
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) Error (c) 6
12. 12.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 4;
    marks = marks - 1;
    console.log(marks);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) Error (c) 10
15. 15.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 11;
    apples = apples - 14;
    console.log(apples);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
17. 17.⚡ What number does this code print?
    let a = 29;
    let b = 4;
    console.log(a - b);
18. 18.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) let
19. 19.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) if
20. 20.⚡ What number does this code print?
    let a = 51;
    let b = 23;
    console.log(a - b);
21. 21.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) alert() (d) console.log()
22. 22.⚡ What number does this code print?
    let a = 16;
    let b = 5;
    console.log(a + b);
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
25. 25.⚡ What number does this code print?
    let a = 26;
    let b = 6;
    console.log(a - b);
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
27. 27.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, Meera! (d) Welcome, name!
28. 28.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 14;
    let b = 34;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let books = 10;
    books = books + 8;
    books = books - 9;
    console.log(books);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
32. 32.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 9;
    runs = runs - 28;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 45;
    let b = 36;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 11;
    runs = runs - 27;
    console.log(runs);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) Error (c) 7
36. 36.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
37. 37.⚡ What number does this code print?
    let a = 35;
    let b = 2;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 15;
    coins = coins - 26;
    console.log(coins);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
40. 40.⚡ What number does this code print?
    let a = 16;
    let b = 7;
    console.log(a - b);

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