JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 211 · 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 does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, Arjun! (d) Well done, name!
2. 2.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
3. 3.⚡ What number does this code print?
   let coins = 21;
   coins = coins + 13;
   coins = coins - 23;
   console.log(coins);
4. 4.⚡ What number does this code print?
   let runs = 13;
   runs = runs + 15;
   runs = runs - 18;
   console.log(runs);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) if
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 6;
   console.log(x + y); (a) Error (b) 46 (c) 10
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!
8. 8.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
9. 9.⚡ What number does this code print?
   let a = 57;
   let b = 29;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8
11. 11.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) for (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 58;
    let b = 16;
    console.log(a - b);
13. 13.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) console.log() (d) alert()
14. 14.⚡ What number does this code print?
    let a = 37;
    let b = 4;
    console.log(a + b);
15. 15.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
16. 16.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
18. 18.⚡ What number does this code print?
    let score = 26;
    score = score + 15;
    score = score - 17;
    console.log(score);
19. 19.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) let (d) for
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Welcome, name! (c) Arjun (d) name
21. 21.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
22. 22.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 91 (b) 10 (c) Error
25. 25.⚡ What number does this code print?
    let a = 48;
    let b = 32;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 16;
    apples = apples - 18;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
28. 28.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 9;
    coins = coins - 12;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let books = 17;
    books = books + 14;
    books = books - 19;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) Error (c) 11
31. 31.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 19;
    coins = coins - 18;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 8 (c) 53
33. 33.⚡ What number does this code print?
    let a = 10;
    let b = 8;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) name (d) Hi, Aman!
35. 35.⚡ What number does this code print?
    let a = 47;
    let b = 20;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 67 (c) 13
37. 37.⚡ 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
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 23;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 60;
    let b = 24;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 41;
    let b = 40;
    console.log(a + b);

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