JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 136 · 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 runs code when true? (a) console.log() (b) alert() (c) for (d) if
2. 2.⚡ What number does this code print?
   let marks = 17;
   marks = marks + 2;
   marks = marks - 9;
   console.log(marks);
3. 3.⚡ What number does this code print?
   let a = 37;
   let b = 11;
   console.log(a - b);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) Error (b) 4 (c) 13
5. 5.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) Error (b) 7 (c) 52
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
8. 8.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) if
9. 9.⚡ What number does this code print?
   let score = 16;
   score = score + 3;
   score = score - 16;
   console.log(score);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) for
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) Hi, Riya! (d) name
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, name! (d) Well done, Zoya!
13. 13.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 9;
    coins = coins - 17;
    console.log(coins);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 5 (c) 41
15. 15.⚡ What number does this code print?
    let a = 55;
    let b = 25;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 10;
    apples = apples - 3;
    console.log(apples);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) Error (c) 11
19. 19.⚡ What number does this code print?
    let score = 25;
    score = score + 8;
    score = score - 13;
    console.log(score);
20. 20.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) 11 (c) Error
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Kabir (b) Hello, Kabir! (c) name (d) Hello, name!
23. 23.⚡ Which JavaScript word repeats code? (a) let (b) for (c) alert() (d) if
24. 24.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Kabir! (d) Kabir
25. 25.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 10;
    coins = coins - 12;
    console.log(coins);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
27. 27.⚡ What number does this code print?
    let books = 26;
    books = books + 3;
    books = books - 4;
    console.log(books);
28. 28.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
29. 29.⚡ What number does this code print?
    let books = 11;
    books = books + 2;
    books = books - 7;
    console.log(books);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) Error (c) 98
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
33. 33.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 9 (c) 72
36. 36.⚡ What number does this code print?
    let a = 54;
    let b = 6;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 7;
    let b = 14;
    console.log(a + b);
38. 38.⚡ 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
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, Riya! (d) Hello, name!
40. 40.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 14;
    apples = apples - 10;
    console.log(apples);

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