JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 137 · 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 does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
2. 2.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
3. 3.⚡ What number does this code print?
   let apples = 29;
   apples = apples + 17;
   apples = apples - 41;
   console.log(apples);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) let (d) console.log()
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
6. 6.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) alert()
7. 7.⚡ What number does this code print?
   let a = 11;
   let b = 9;
   console.log(a - b);
8. 8.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, name! (d) Hello, Aman!
9. 9.⚡ What number does this code print?
   let a = 17;
   let b = 3;
   console.log(a + b);
10. 10.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
11. 11.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) if
12. 12.⚡ What number does this code print?
    let a = 44;
    let b = 34;
    console.log(a - b);
13. 13.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) let (d) console.log()
14. 14.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
15. 15.⚡ What number does this code print?
    let score = 13;
    score = score + 3;
    score = score - 13;
    console.log(score);
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
17. 17.⚡ What number does this code print?
    let a = 30;
    let b = 20;
    console.log(a + b);
18. 18.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 58;
    let b = 3;
    console.log(a - b);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
22. 22.⚡ What number does this code print?
    let a = 54;
    let b = 38;
    console.log(a + b);
23. 23.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 15;
    runs = runs - 17;
    console.log(runs);
25. 25.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
26. 26.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, Zoya! (b) Zoya (c) name (d) Hello, name!
27. 27.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 9;
    runs = runs - 12;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 68 (b) 14 (c) Error
30. 30.⚡ What number does this code print?
    let a = 50;
    let b = 38;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
32. 32.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
33. 33.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) 25 (c) Error
35. 35.⚡ What number does this code print?
    let books = 24;
    books = books + 19;
    books = books - 19;
    console.log(books);
36. 36.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
37. 37.⚡ What number does this code print?
    let score = 17;
    score = score + 3;
    score = score - 7;
    console.log(score);
38. 38.⚡ What number does this code print?
    let books = 20;
    books = books + 17;
    books = books - 19;
    console.log(books);
39. 39.⚡ What number does this code print?
    let score = 28;
    score = score + 19;
    score = score - 34;
    console.log(score);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name

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