JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 392 · 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 = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) name (d) Zoya
2. 2.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) console.log()
4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) console.log() (d) for
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) 8 (b) Error (c) 71
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) 91 (b) Error (c) 10
8. 8.⚡ What number does this code print?
   let a = 9;
   let b = 10;
   console.log(a * b);
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) if
10. 10.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) let (d) if
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 8 (b) 17 (c) Error
12. 12.⚡ What number does this code print?
    let a = 53;
    let b = 32;
    console.log(a - b);
13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) name (d) Welcome, name!
14. 14.⚡ What number does this code print?
    let a = 23;
    let b = 37;
    console.log(a + b);
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
16. 16.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 19;
    runs = runs - 19;
    console.log(runs);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) Zoya (d) name
20. 20.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 16 (b) 7 (c) Error
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Aman (c) Welcome, name! (d) Welcome, Aman!
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
24. 24.⚡ What number does this code print?
    let books = 20;
    books = books + 18;
    books = books - 23;
    console.log(books);
25. 25.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 7;
    runs = runs - 31;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let books = 30;
    books = books + 5;
    books = books - 9;
    console.log(books);
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 68 (c) 14
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 22 (c) 4
30. 30.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
31. 31.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 9;
    coins = coins - 14;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let marks = 22;
    marks = marks + 3;
    marks = marks - 9;
    console.log(marks);
33. 33.⚡ What number does this code print?
    let score = 20;
    score = score + 2;
    score = score - 19;
    console.log(score);
34. 34.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Aman (d) Hi, Aman!
35. 35.⚡ What number does this code print?
    let books = 17;
    books = books + 11;
    books = books - 2;
    console.log(books);
36. 36.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 23;
    let b = 30;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) 74 (c) Error
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);

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