JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 64 · 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 = 55;
   let b = 36;
   console.log(a - b);
2. 2.⚡ What number does this code print?
   let runs = 8;
   runs = runs + 18;
   runs = runs - 11;
   console.log(runs);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 8;
   console.log(x + y); (a) 28 (b) 10 (c) Error
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) let
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) for
6. 6.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
7. 7.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
9. 9.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
10. 10.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) Welcome, name! (d) name
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) 96 (c) Error
13. 13.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 2;
    console.log(a + b);
16. 16.⚡ Which JavaScript word repeats code? (a) for (b) if (c) let (d) alert()
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
18. 18.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 28;
    let b = 8;
    console.log(a - b);
20. 20.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
21. 21.⚡ What number does this code print?
    let books = 26;
    books = books + 2;
    books = books - 24;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 26;
    let b = 29;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 9;
    runs = runs - 4;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
25. 25.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
26. 26.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 13;
    apples = apples - 15;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Meera (d) Hello, Meera!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 13 (c) 94
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) Error (c) 10
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
31. 31.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 7;
    coins = coins - 6;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 18;
    runs = runs - 9;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 38;
    let b = 23;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) Hi, Arjun! (d) name
35. 35.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 17;
    apples = apples - 44;
    console.log(apples);
36. 36.⚡ What number does this code print?
    let a = 25;
    let b = 13;
    console.log(a - b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 29 (c) 11
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) 11 (b) Error (c) 47
39. 39.⚡ What number does this code print?
    let a = 58;
    let b = 18;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 35;
    let b = 14;
    console.log(a + b);

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