JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 950 · 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 shows a pop-up box? (a) console.log() (b) alert() (c) if (d) let
2. 2.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
3. 3.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
4. 4.⚡ What number does this code print?
   let apples = 29;
   apples = apples + 4;
   apples = apples - 18;
   console.log(apples);
5. 5.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) Hello, Aman! (d) name
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Hello, name! (d) Arjun
7. 7.⚡ What number does this code print?
   let a = 40;
   let b = 6;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 4;
   let b = 8;
   console.log(a * b);
9. 9.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
11. 11.⚡ What number does this code print?
    let score = 12;
    score = score + 14;
    score = score - 14;
    console.log(score);
12. 12.⚡ What number does this code print?
    let books = 8;
    books = books + 15;
    books = books - 18;
    console.log(books);
13. 13.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
14. 14.⚡ What number does this code print?
    let score = 6;
    score = score + 17;
    score = score - 9;
    console.log(score);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
18. 18.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) console.log()
19. 19.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 14;
    apples = apples - 3;
    console.log(apples);
20. 20.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
21. 21.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 15;
    coins = coins - 8;
    console.log(coins);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 22 (b) Error (c) 4
23. 23.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 11;
    apples = apples - 15;
    console.log(apples);
24. 24.⚡ Which JavaScript word makes a new variable? (a) alert() (b) if (c) console.log() (d) let
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
26. 26.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) Error (b) 10 (c) 28
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 19;
    runs = runs - 18;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 17;
    apples = apples - 12;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 16;
    apples = apples - 1;
    console.log(apples);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) Error (c) 10
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 25;
    let b = 2;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 13 (c) 4
39. 39.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 6;
    marks = marks - 3;
    console.log(marks);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman

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