JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 48 · 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 word makes a new variable? (a) give (b) put (c) let (d) make
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) name (c) Zoya (d) Hi, name!
3. 3.⚡ What number does this code print?
   let books = 9;
   books = books + 15;
   books = books - 20;
   console.log(books);
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
5. 5.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
7. 7.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) console.log()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) 62 (b) 8 (c) Error
9. 9.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) alert()
10. 10.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 18;
    coins = coins - 23;
    console.log(coins);
11. 11.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
12. 12.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
13. 13.⚡ What number does this code print?
    let books = 18;
    books = books + 16;
    books = books - 18;
    console.log(books);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Zoya! (c) name (d) Zoya
15. 15.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 14;
    coins = coins - 15;
    console.log(coins);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 25 (c) 7
17. 17.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
18. 18.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, name! (d) Well done, Arjun!
21. 21.⚡ What number does this code print?
    let a = 19;
    let b = 14;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
23. 23.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
24. 24.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
25. 25.⚡ What number does this code print?
    let score = 26;
    score = score + 10;
    score = score - 27;
    console.log(score);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) Error (c) 41
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
28. 28.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 13;
    runs = runs - 2;
    console.log(runs);
29. 29.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 14;
    coins = coins - 25;
    console.log(coins);
30. 30.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
32. 32.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 11;
    apples = apples - 16;
    console.log(apples);
33. 33.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) let (d) for
34. 34.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 5;
    apples = apples - 28;
    console.log(apples);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Aman! (d) Aman
37. 37.⚡ What number does this code print?
    let books = 7;
    books = books + 19;
    books = books - 7;
    console.log(books);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 11 (c) 92
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 23 (c) 5
40. 40.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);

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