JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 425 · 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 print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) Error (b) 23 (c) 5
2. 2.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) console.log() (d) if
3. 3.⚡ What number does this code print?
   let marks = 12;
   marks = marks + 13;
   marks = marks - 22;
   console.log(marks);
4. 4.⚡ What number does this code print?
   let coins = 5;
   coins = coins + 8;
   coins = coins - 13;
   console.log(coins);
5. 5.⚡ What number does this code print?
   let marks = 20;
   marks = marks + 10;
   marks = marks - 12;
   console.log(marks);
6. 6.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 2;
   runs = runs - 6;
   console.log(runs);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 7;
   console.log(x + y); (a) 77 (b) Error (c) 14
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
9. 9.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
10. 10.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) name (d) Welcome, name!
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 51 (c) 6
14. 14.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) console.log()
15. 15.⚡ What number does this code print?
    let marks = 29;
    marks = marks + 15;
    marks = marks - 17;
    console.log(marks);
16. 16.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 8;
    coins = coins - 21;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 12;
    apples = apples - 16;
    console.log(apples);
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) console.log() (d) alert()
21. 21.⚡ What number does this code print?
    let a = 17;
    let b = 5;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) 14 (c) Error
23. 23.⚡ What number does this code print?
    let a = 33;
    let b = 23;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let a = 9;
    let b = 39;
    console.log(a + b);
25. 25.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) for (d) console.log()
26. 26.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) let
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, Riya! (d) Well done, name!
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 12;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) Error (c) 19
30. 30.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
31. 31.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Arjun! (d) Arjun
33. 33.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let books = 9;
    books = books + 17;
    books = books - 17;
    console.log(books);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
36. 36.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 6;
    apples = apples - 9;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) Error (c) 15
38. 38.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 8;
    apples = apples - 14;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 19;
    coins = coins - 31;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let a = 39;
    let b = 10;
    console.log(a + b);

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