JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 35 · 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 = 6;
   let b = 17;
   console.log(a + b);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) for (d) if
3. 3.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) let (d) console.log()
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 14 (b) Error (c) 95
6. 6.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
7. 7.⚡ What number does this code print?
   let runs = 7;
   runs = runs + 5;
   runs = runs - 5;
   console.log(runs);
8. 8.⚡ What number does this code print?
   let a = 6;
   let b = 8;
   console.log(a * b);
9. 9.⚡ What number does this code print?
   let a = 29;
   let b = 14;
   console.log(a + b);
10. 10.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Kabir! (d) Kabir
11. 11.⚡ What number does this code print?
    let a = 38;
    let b = 2;
    console.log(a + b);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
13. 13.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 8;
    coins = coins - 27;
    console.log(coins);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) Error (b) 8 (c) 26
15. 15.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) 6 (c) Error
17. 17.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
18. 18.⚡ What number does this code print?
    let a = 20;
    let b = 29;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let score = 17;
    score = score + 12;
    score = score - 18;
    console.log(score);
20. 20.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
22. 22.⚡ What number does this code print?
    let books = 7;
    books = books + 3;
    books = books - 5;
    console.log(books);
23. 23.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
24. 24.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) if (d) alert()
25. 25.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
27. 27.⚡ What number does this code print?
    let score = 18;
    score = score + 13;
    score = score - 29;
    console.log(score);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
29. 29.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a * b);
30. 30.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
33. 33.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) alert() (c) let (d) if
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 28;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
36. 36.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 5;
    coins = coins - 6;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 34;
    let b = 30;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
40. 40.⚡ What number does this code print?
    let a = 6;
    let b = 6;
    console.log(a * b);

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