JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 875 · 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.⚡ 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
2. 2.⚡ What number does this code print?
   let runs = 14;
   runs = runs + 12;
   runs = runs - 25;
   console.log(runs);
3. 3.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) for (d) console.log()
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 8;
   console.log(x + y); (a) 13 (b) 58 (c) Error
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
7. 7.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
8. 8.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) console.log()
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Arjun (d) Hi, Arjun!
10. 10.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <js> (d) <script>
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
12. 12.⚡ What number does this code print?
    let score = 11;
    score = score + 4;
    score = score - 14;
    console.log(score);
13. 13.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
14. 14.⚡ What number does this code print?
    let a = 24;
    let b = 16;
    console.log(a + b);
15. 15.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
16. 16.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 13;
    apples = apples - 23;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 6;
    runs = runs - 8;
    console.log(runs);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) name (d) Hi, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) 11 (c) Error
22. 22.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 5;
    apples = apples - 9;
    console.log(apples);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 73 (b) Error (c) 10
24. 24.⚡ What number does this code print?
    let books = 24;
    books = books + 3;
    books = books - 4;
    console.log(books);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) Error (b) 57 (c) 12
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) Error (b) 36 (c) 9
27. 27.⚡ What number does this code print?
    let runs = 12;
    runs = runs + 4;
    runs = runs - 1;
    console.log(runs);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 5 (b) Error (c) 14
29. 29.⚡ What number does this code print?
    let score = 6;
    score = score + 2;
    score = score - 8;
    console.log(score);
30. 30.⚡ What number does this code print?
    let books = 5;
    books = books + 16;
    books = books - 4;
    console.log(books);
31. 31.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 14;
    apples = apples - 4;
    console.log(apples);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
33. 33.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
34. 34.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
36. 36.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 17;
    apples = apples - 35;
    console.log(apples);
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 19;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 17;
    let b = 3;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
40. 40.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 18;
    coins = coins - 9;
    console.log(coins);

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