JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 209 · 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 title bar (b) in the address bar (c) in the console (d) on the printer
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) Hi, Aman! (d) name
3. 3.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
5. 5.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) if (d) for
6. 6.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
7. 7.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
8. 8.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 10;
   runs = runs - 3;
   console.log(runs);
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
10. 10.⚡ What number does this code print?
    let a = 20;
    let b = 18;
    console.log(a - b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
12. 12.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 3;
    apples = apples - 2;
    console.log(apples);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 15 (c) 96
14. 14.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
16. 16.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 13;
    coins = coins - 2;
    console.log(coins);
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) alert() (d) console.log()
18. 18.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
19. 19.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
20. 20.⚡ What number does this code print?
    let a = 11;
    let b = 5;
    console.log(a * b);
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 27;
    console.log(a + b);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
23. 23.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
24. 24.⚡ What number does this code print?
    let a = 39;
    let b = 6;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 42;
    let b = 26;
    console.log(a + b);
26. 26.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) name (d) Hi, name!
28. 28.⚡ What number does this code print?
    let a = 17;
    let b = 29;
    console.log(a + b);
29. 29.⚡ 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
30. 30.⚡ What number does this code print?
    let a = 35;
    let b = 12;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
32. 32.⚡ What number does this code print?
    let score = 24;
    score = score + 12;
    score = score - 1;
    console.log(score);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) Welcome, Zoya! (d) name
34. 34.⚡ What number does this code print?
    let books = 30;
    books = books + 3;
    books = books - 32;
    console.log(books);
35. 35.⚡ What number does this code print?
    let books = 19;
    books = books + 9;
    books = books - 18;
    console.log(books);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
37. 37.⚡ What number does this code print?
    let a = 19;
    let b = 11;
    console.log(a + b);
38. 38.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
39. 39.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let books = 26;
    books = books + 9;
    books = books - 30;
    console.log(books);

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