JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 550 · 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 this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) Hi, Kabir! (d) name
2. 2.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) if (d) let
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) 8 (b) 62 (c) Error
4. 4.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) console.log()
5. 5.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
6. 6.⚡ What number does this code print?
   let score = 13;
   score = score + 4;
   score = score - 9;
   console.log(score);
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 8;
   console.log(a * b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) Error (b) 17 (c) 98
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) let
10. 10.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error
12. 12.⚡ What number does this code print?
    let a = 53;
    let b = 7;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 58;
    let b = 11;
    console.log(a + b);
14. 14.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) console.log() (d) if
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
16. 16.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Zoya (d) Welcome, Zoya!
18. 18.⚡ Which JavaScript word repeats code? (a) for (b) if (c) console.log() (d) alert()
19. 19.⚡ What number does this code print?
    let a = 57;
    let b = 3;
    console.log(a + b);
20. 20.⚡ 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
21. 21.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 19;
    coins = coins - 18;
    console.log(coins);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
24. 24.⚡ What number does this code print?
    let score = 28;
    score = score + 11;
    score = score - 16;
    console.log(score);
25. 25.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 11;
    coins = coins - 33;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 15;
    let b = 24;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 32;
    let b = 25;
    console.log(a - b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) Welcome, Arjun! (d) name
29. 29.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
30. 30.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) Error (c) 49
32. 32.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
33. 33.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 2;
    runs = runs - 18;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
35. 35.⚡ What number does this code print?
    let a = 35;
    let b = 33;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
40. 40.⚡ What number does this code print?
    let score = 20;
    score = score + 12;
    score = score - 1;
    console.log(score);

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