JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 658 · 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 score = 27;
   score = score + 13;
   score = score - 40;
   console.log(score);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 2;
   console.log(x + y); (a) 4 (b) 22 (c) Error
3. 3.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) let
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) if (d) let
5. 5.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
6. 6.⚡ What number does this code print?
   let coins = 21;
   coins = coins + 10;
   coins = coins - 26;
   console.log(coins);
7. 7.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 48 (c) 12
10. 10.⚡ 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
11. 11.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 10;
    runs = runs - 7;
    console.log(runs);
12. 12.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 7;
    coins = coins - 5;
    console.log(coins);
13. 13.⚡ Which word makes a new variable? (a) let (b) give (c) make (d) put
14. 14.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 4;
    runs = runs - 20;
    console.log(runs);
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
17. 17.⚡ What number does this code print?
    let a = 41;
    let b = 26;
    console.log(a + b);
18. 18.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Riya (d) Hello, name!
20. 20.⚡ What number does this code print?
    let score = 19;
    score = score + 9;
    score = score - 7;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) 14 (c) Error
22. 22.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 17;
    apples = apples - 8;
    console.log(apples);
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) let (d) alert()
24. 24.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Riya! (d) Riya
25. 25.⚡ What number does this code print?
    let a = 26;
    let b = 17;
    console.log(a - b);
26. 26.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) for (d) let
27. 27.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 14;
    runs = runs - 10;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 11;
    coins = coins - 12;
    console.log(coins);
29. 29.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
30. 30.⚡ What number does this code print?
    let runs = 16;
    runs = runs + 15;
    runs = runs - 11;
    console.log(runs);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
32. 32.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 39;
    let b = 28;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
35. 35.⚡ What number does this code print?
    let a = 16;
    let b = 12;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 44;
    let b = 7;
    console.log(a + b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
39. 39.⚡ What number does this code print?
    let books = 12;
    books = books + 7;
    books = books - 9;
    console.log(books);
40. 40.⚡ What number does this code print?
    let a = 7;
    let b = 13;
    console.log(a + b);

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