JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 22 · 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 number does this code print?
   let a = 57;
   let b = 35;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 52;
   let b = 32;
   console.log(a + b);
3. 3.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
4. 4.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
5. 5.⚡ What number does this code print?
   let score = 19;
   score = score + 18;
   score = score - 25;
   console.log(score);
6. 6.⚡ What number does this code print?
   let a = 34;
   let b = 6;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 12 (c) 48
10. 10.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
13. 13.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 2;
    coins = coins - 7;
    console.log(coins);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Kabir! (d) Kabir
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
16. 16.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 2;
    apples = apples - 2;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
18. 18.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
20. 20.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
21. 21.⚡ What number does this code print?
    let a = 38;
    let b = 12;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
23. 23.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
24. 24.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) for
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
26. 26.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
27. 27.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
28. 28.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 16;
    let b = 5;
    console.log(a - b);
31. 31.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) for
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 23;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 44;
    let b = 3;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 18;
    let b = 37;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
36. 36.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 18;
    runs = runs - 2;
    console.log(runs);
37. 37.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 14;
    let b = 12;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let score = 20;
    score = score + 17;
    score = score - 9;
    console.log(score);
40. 40.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 7;
    coins = coins - 14;
    console.log(coins);

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