JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 128 · 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 writes in the console? (a) console.log() (b) if (c) let (d) alert()
2. 2.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) Aman (d) name
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) if
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 7;
   console.log(x + y); (a) Error (b) 17 (c) 8
6. 6.⚡ What number does this code print?
   let runs = 16;
   runs = runs + 18;
   runs = runs - 1;
   console.log(runs);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
8. 8.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
9. 9.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) if (d) console.log()
10. 10.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 18;
    coins = coins - 11;
    console.log(coins);
11. 11.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) console.log()
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
13. 13.⚡ What number does this code print?
    let a = 41;
    let b = 15;
    console.log(a + b);
14. 14.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 11;
    runs = runs - 15;
    console.log(runs);
15. 15.⚡ What number does this code print?
    let a = 19;
    let b = 35;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
17. 17.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
18. 18.⚡ What number does this code print?
    let a = 60;
    let b = 11;
    console.log(a - b);
19. 19.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Zoya! (c) Zoya (d) name
21. 21.⚡ What number does this code print?
    let a = 50;
    let b = 35;
    console.log(a - b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 48 (b) Error (c) 12
23. 23.⚡ What number does this code print?
    let score = 5;
    score = score + 6;
    score = score - 3;
    console.log(score);
24. 24.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the console (d) in the address bar
25. 25.⚡ What number does this code print?
    let a = 51;
    let b = 25;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 31;
    let b = 9;
    console.log(a - b);
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
28. 28.⚡ What number does this code print?
    let score = 22;
    score = score + 7;
    score = score - 29;
    console.log(score);
29. 29.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) for
30. 30.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Riya (d) Hi, Riya!
32. 32.⚡ What number does this code print?
    let books = 22;
    books = books + 5;
    books = books - 18;
    console.log(books);
33. 33.⚡ What number does this code print?
    let books = 18;
    books = books + 2;
    books = books - 12;
    console.log(books);
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let books = 11;
    books = books + 3;
    books = books - 1;
    console.log(books);
37. 37.⚡ What number does this code print?
    let a = 17;
    let b = 15;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 56;
    let b = 23;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 13;
    apples = apples - 8;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!

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