JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 436 · 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) for (b) console.log() (c) if (d) let
2. 2.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) alert() (d) for
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 12;
   console.log(a * b);
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Arjun (d) Well done, Arjun!
7. 7.⚡ What number does this code print?
   let a = 12;
   let b = 38;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 23;
   let b = 20;
   console.log(a - b);
9. 9.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
10. 10.⚡ What number does this code print?
    let a = 23;
    let b = 21;
    console.log(a - b);
11. 11.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 17;
    apples = apples - 30;
    console.log(apples);
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
13. 13.⚡ What number does this code print?
    let a = 17;
    let b = 2;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let a = 36;
    let b = 29;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 13;
    coins = coins - 1;
    console.log(coins);
16. 16.⚡ What number does this code print?
    let a = 34;
    let b = 29;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let score = 10;
    score = score + 6;
    score = score - 13;
    console.log(score);
19. 19.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
20. 20.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <code> (d) <style>
21. 21.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 35;
    console.log(a + b);
24. 24.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
25. 25.⚡ What number does this code print?
    let a = 17;
    let b = 10;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) Error (c) 96
27. 27.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 4;
    apples = apples - 6;
    console.log(apples);
28. 28.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
29. 29.⚡ What number does this code print?
    let score = 10;
    score = score + 17;
    score = score - 5;
    console.log(score);
30. 30.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 9;
    coins = coins - 23;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 48;
    let b = 20;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 42;
    let b = 9;
    console.log(a + b);
34. 34.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
36. 36.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let books = 27;
    books = books + 9;
    books = books - 29;
    console.log(books);
38. 38.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
39. 39.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) for (d) let
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25

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