JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 431 · 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 a = 2;
   let b = 10;
   console.log(a * b);
2. 2.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) let (d) for
3. 3.⚡ What number does this code print?
   let a = 2;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
5. 5.⚡ What number does this code print?
   let a = 44;
   let b = 30;
   console.log(a + b);
6. 6.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) alert()
7. 7.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) if (d) console.log()
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) alert() (d) for
12. 12.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 14;
    coins = coins - 4;
    console.log(coins);
13. 13.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
14. 14.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 14;
    coins = coins - 7;
    console.log(coins);
15. 15.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
16. 16.⚡ What number does this code print?
    let score = 12;
    score = score + 17;
    score = score - 8;
    console.log(score);
17. 17.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
18. 18.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 17;
    apples = apples - 21;
    console.log(apples);
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, name! (c) name (d) Well done, Kabir!
20. 20.⚡ What number does this code print?
    let a = 41;
    let b = 3;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 5;
    apples = apples - 17;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 5;
    console.log(a * b);
23. 23.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
24. 24.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
25. 25.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
26. 26.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) name (d) Zoya
28. 28.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 7;
    runs = runs - 12;
    console.log(runs);
30. 30.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let a = 49;
    let b = 17;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let score = 21;
    score = score + 14;
    score = score - 22;
    console.log(score);
34. 34.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 20;
    coins = coins - 1;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
37. 37.⚡ What number does this code print?
    let books = 26;
    books = books + 14;
    books = books - 3;
    console.log(books);
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 a = 53;
    let b = 18;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 12 (c) 66

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