JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 733 · 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 JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) Error (b) 17 (c) 89
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
6. 6.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
7. 7.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
8. 8.⚡ 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
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 2;
   console.log(x + y); (a) 5 (b) Error (c) 32
10. 10.⚡ What number does this code print?
    let a = 42;
    let b = 20;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 22;
    let b = 9;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
13. 13.⚡ What number does this code print?
    let books = 30;
    books = books + 17;
    books = books - 25;
    console.log(books);
14. 14.⚡ What number does this code print?
    let a = 10;
    let b = 25;
    console.log(a + b);
15. 15.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
16. 16.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
17. 17.⚡ What number does this code print?
    let a = 40;
    let b = 5;
    console.log(a - b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
19. 19.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
20. 20.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
21. 21.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 19;
    runs = runs - 24;
    console.log(runs);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) name (d) Kabir
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) 14 (c) Error
24. 24.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 7;
    runs = runs - 13;
    console.log(runs);
25. 25.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
26. 26.⚡ What number does this code print?
    let score = 21;
    score = score + 14;
    score = score - 20;
    console.log(score);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
28. 28.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
30. 30.⚡ What number does this code print?
    let a = 58;
    let b = 5;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
32. 32.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 8;
    marks = marks - 24;
    console.log(marks);
33. 33.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) 10 (c) Error
36. 36.⚡ What number does this code print?
    let books = 24;
    books = books + 5;
    books = books - 18;
    console.log(books);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 31 (c) 4
38. 38.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 10;
    apples = apples - 15;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 52;
    let b = 40;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let books = 23;
    books = books + 16;
    books = books - 21;
    console.log(books);

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