JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 953 · 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 JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
2. 2.⚡ What number does this code print?
   let a = 26;
   let b = 13;
   console.log(a + b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) Error (c) 64
4. 4.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) let (d) alert()
5. 5.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) name (d) Arjun
7. 7.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) let (d) if
8. 8.⚡ What number does this code print?
   let a = 15;
   let b = 6;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 10;
   coins = coins - 3;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 4;
    apples = apples - 24;
    console.log(apples);
11. 11.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) Hello, name! (d) name
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
13. 13.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 25 (b) Error (c) 7
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) Error (c) 54
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 7 (b) Error (c) 52
18. 18.⚡ What number does this code print?
    let books = 24;
    books = books + 15;
    books = books - 8;
    console.log(books);
19. 19.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
20. 20.⚡ What number does this code print?
    let a = 48;
    let b = 21;
    console.log(a + b);
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.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
23. 23.⚡ What number does this code print?
    let score = 7;
    score = score + 15;
    score = score - 7;
    console.log(score);
24. 24.⚡ What number does this code print?
    let books = 8;
    books = books + 10;
    books = books - 10;
    console.log(books);
25. 25.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) 71 (c) Error
27. 27.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
28. 28.⚡ What number does this code print?
    let a = 42;
    let b = 19;
    console.log(a - b);
29. 29.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
30. 30.⚡ What number does this code print?
    let score = 26;
    score = score + 14;
    score = score - 23;
    console.log(score);
31. 31.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
33. 33.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
34. 34.⚡ What number does this code print?
    let score = 8;
    score = score + 9;
    score = score - 6;
    console.log(score);
35. 35.⚡ What number does this code print?
    let a = 16;
    let b = 22;
    console.log(a + b);
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Meera (d) Hi, Meera!
37. 37.⚡ What number does this code print?
    let a = 41;
    let b = 18;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) 10 (c) Error
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya

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