JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 988 · 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 apples = 19;
   apples = apples + 16;
   apples = apples - 6;
   console.log(apples);
2. 2.⚡ What does this code show?
   let name = "Meera";
   console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) name (d) Welcome, Meera!
3. 3.⚡ What number does this code print?
   let a = 25;
   let b = 21;
   console.log(a - b);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) if
5. 5.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 6;
   console.log(x + y); (a) Error (b) 9 (c) 36
8. 8.⚡ What number does this code print?
   let score = 7;
   score = score + 12;
   score = score - 5;
   console.log(score);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) 3 (b) 21 (c) Error
10. 10.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
11. 11.⚡ Which JavaScript word repeats code? (a) if (b) for (c) alert() (d) console.log()
12. 12.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
13. 13.⚡ What number does this code print?
    let a = 40;
    let b = 25;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let books = 17;
    books = books + 10;
    books = books - 25;
    console.log(books);
15. 15.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) name (d) Welcome, name!
16. 16.⚡ 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
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
18. 18.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
19. 19.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
20. 20.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
21. 21.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
22. 22.⚡ What number does this code print?
    let a = 56;
    let b = 33;
    console.log(a + b);
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
24. 24.⚡ What number does this code print?
    let a = 26;
    let b = 38;
    console.log(a + b);
25. 25.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) alert()
26. 26.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Arjun (c) Well done, name! (d) name
28. 28.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 19;
    apples = apples - 2;
    console.log(apples);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) 14 (c) Error
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
32. 32.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 6;
    apples = apples - 29;
    console.log(apples);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) 14 (c) Error
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 4 (b) Error (c) 13
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 29;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 50;
    let b = 11;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 9;
    apples = apples - 3;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman

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