JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 260 · 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 = "9";
   let y = 1;
   console.log(x + y); (a) 10 (b) 91 (c) Error
2. 2.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
3. 3.⚡ What number does this code print?
   let score = 28;
   score = score + 8;
   score = score - 24;
   console.log(score);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 4;
   console.log(x + y); (a) Error (b) 44 (c) 8
5. 5.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) name (c) Hi, Riya! (d) Hi, name!
6. 6.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) alert()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) 12 (b) Error (c) 66
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
11. 11.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
12. 12.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) let (d) for
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
14. 14.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 14;
    apples = apples - 18;
    console.log(apples);
15. 15.⚡ What number does this code print?
    let a = 12;
    let b = 13;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 11;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let books = 9;
    books = books + 13;
    books = books - 17;
    console.log(books);
19. 19.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) console.log()
20. 20.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) let (d) for
21. 21.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 13;
    apples = apples - 31;
    console.log(apples);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
23. 23.⚡ What number does this code print?
    let score = 6;
    score = score + 17;
    score = score - 17;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
25. 25.⚡ What number does this code print?
    let a = 46;
    let b = 13;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let a = 32;
    let b = 21;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Zoya (c) Welcome, name! (d) name
28. 28.⚡ What number does this code print?
    let books = 25;
    books = books + 9;
    books = books - 22;
    console.log(books);
29. 29.⚡ What number does this code print?
    let coins = 23;
    coins = coins + 2;
    coins = coins - 8;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 24;
    let b = 17;
    console.log(a - b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
33. 33.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 12;
    runs = runs - 1;
    console.log(runs);
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
35. 35.⚡ What number does this code print?
    let a = 54;
    let b = 38;
    console.log(a + b);
36. 36.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
38. 38.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 5;
    coins = coins - 10;
    console.log(coins);
39. 39.⚡ What number does this code print?
    let score = 19;
    score = score + 14;
    score = score - 27;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);

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