JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 626 · 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 number does this code print?
   let a = 3;
   let b = 7;
   console.log(a * b);
2. 2.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 10;
   let b = 3;
   console.log(a * b);
4. 4.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) if (c) for (d) let
5. 5.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) if
6. 6.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 8;
   console.log(x + y); (a) 14 (b) 68 (c) Error
8. 8.⚡ What number does this code print?
   let a = 22;
   let b = 25;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let marks = 25;
   marks = marks + 17;
   marks = marks - 2;
   console.log(marks);
10. 10.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
11. 11.⚡ What number does this code print?
    let a = 35;
    let b = 9;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 4;
    coins = coins - 22;
    console.log(coins);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) Error (c) 18
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Zoya! (d) Zoya
16. 16.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 14;
    coins = coins - 23;
    console.log(coins);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) 92 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 55 (b) 10 (c) Error
19. 19.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 8;
    marks = marks - 7;
    console.log(marks);
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
21. 21.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 15;
    marks = marks - 6;
    console.log(marks);
22. 22.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
23. 23.⚡ What number does this code print?
    let books = 20;
    books = books + 9;
    books = books - 2;
    console.log(books);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
27. 27.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
29. 29.⚡ What number does this code print?
    let score = 6;
    score = score + 8;
    score = score - 1;
    console.log(score);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) Error (b) 5 (c) 14
31. 31.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 6;
    apples = apples - 2;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let a = 12;
    let b = 3;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Hello, name! (c) name (d) Meera
37. 37.⚡ What number does this code print?
    let a = 7;
    let b = 17;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let books = 9;
    books = books + 7;
    books = books - 13;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 12 (b) Error (c) 39

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