JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 844 · 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 tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
3. 3.⚡ What number does this code print?
   let a = 36;
   let b = 16;
   console.log(a - b);
4. 4.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Kabir! (d) Kabir
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) 38 (b) 11 (c) Error
6. 6.⚡ What number does this code print?
   let apples = 30;
   apples = apples + 18;
   apples = apples - 11;
   console.log(apples);
7. 7.⚡ What number does this code print?
   let a = 13;
   let b = 5;
   console.log(a - b);
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Riya (d) Welcome, name!
9. 9.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) Error (c) 17
11. 11.⚡ What number does this code print?
    let a = 43;
    let b = 31;
    console.log(a + b);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
14. 14.⚡ What number does this code print?
    let a = 35;
    let b = 7;
    console.log(a - b);
15. 15.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
16. 16.⚡ Which JavaScript word makes a new variable? (a) if (b) alert() (c) let (d) for
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) Hi, Arjun! (d) name
18. 18.⚡ What number does this code print?
    let a = 52;
    let b = 11;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 12;
    apples = apples - 12;
    console.log(apples);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
21. 21.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) for
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
23. 23.⚡ What number does this code print?
    let a = 17;
    let b = 30;
    console.log(a + b);
24. 24.⚡ What does alert() show? (a) a table (b) a picture (c) a pop-up box (d) a new tab
25. 25.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
28. 28.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let a = 40;
    let b = 38;
    console.log(a - b);
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
31. 31.⚡ 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
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) Error (c) 93
33. 33.⚡ What number does this code print?
    let score = 24;
    score = score + 3;
    score = score - 26;
    console.log(score);
34. 34.⚡ What number does this code print?
    let a = 37;
    let b = 5;
    console.log(a - b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
36. 36.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 16;
    apples = apples - 2;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) Error (b) 11 (c) 83
39. 39.⚡ What number does this code print?
    let books = 18;
    books = books + 15;
    books = books - 17;
    console.log(books);
40. 40.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 11;
    coins = coins - 3;
    console.log(coins);

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