JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 403 · 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 word makes a new variable? (a) put (b) make (c) let (d) give
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
3. 3.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
5. 5.⚡ What number does this code print?
   let coins = 14;
   coins = coins + 16;
   coins = coins - 16;
   console.log(coins);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
7. 7.⚡ What number does this code print?
   let books = 6;
   books = books + 20;
   books = books - 12;
   console.log(books);
8. 8.⚡ Which JavaScript word runs code when true? (a) alert() (b) let (c) console.log() (d) if
9. 9.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
10. 10.⚡ What number does this code print?
    let score = 16;
    score = score + 8;
    score = score - 6;
    console.log(score);
11. 11.⚡ What number does this code print?
    let a = 21;
    let b = 20;
    console.log(a - b);
12. 12.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) if (d) console.log()
13. 13.⚡ What number does this code print?
    let a = 28;
    let b = 11;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let score = 27;
    score = score + 19;
    score = score - 19;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
16. 16.⚡ What number does this code print?
    let a = 53;
    let b = 34;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 7;
    let b = 11;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
20. 20.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
21. 21.⚡ What number does this code print?
    let score = 20;
    score = score + 15;
    score = score - 2;
    console.log(score);
22. 22.⚡ What number does this code print?
    let a = 55;
    let b = 13;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 3;
    runs = runs - 6;
    console.log(runs);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
25. 25.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) name (c) Welcome, name! (d) Aman
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) for
27. 27.⚡ What number does this code print?
    let a = 50;
    let b = 24;
    console.log(a - b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) 39 (c) Error
29. 29.⚡ What number does this code print?
    let score = 30;
    score = score + 3;
    score = score - 3;
    console.log(score);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error
31. 31.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 10;
    apples = apples - 14;
    console.log(apples);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 91 (c) 10
33. 33.⚡ What number does this code print?
    let coins = 30;
    coins = coins + 11;
    coins = coins - 2;
    console.log(coins);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) Error (c) 10
35. 35.⚡ What number does this code print?
    let a = 17;
    let b = 10;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 38 (b) Error (c) 11
37. 37.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 12;
    apples = apples - 34;
    console.log(apples);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
40. 40.⚡ What number does this code print?
    let score = 28;
    score = score + 12;
    score = score - 7;
    console.log(score);

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