JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 581 · 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) Hello, Riya! (b) name (c) Riya (d) Hello, name!
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
4. 4.⚡ What does this code show?
   let name = "Meera";
   alert("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
5. 5.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Meera! (c) Meera (d) name
6. 6.⚡ Which JavaScript word runs code when true? (a) alert() (b) console.log() (c) for (d) if
7. 7.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) alert() (d) for
8. 8.⚡ What number does this code print?
   let a = 7;
   let b = 11;
   console.log(a * b);
9. 9.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
10. 10.⚡ What does alert() show? (a) a picture (b) a table (c) a new tab (d) a pop-up box
11. 11.⚡ What number does this code print?
    let books = 26;
    books = books + 5;
    books = books - 8;
    console.log(books);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
13. 13.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
14. 14.⚡ What number does this code print?
    let a = 59;
    let b = 24;
    console.log(a - b);
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
16. 16.⚡ What number does this code print?
    let a = 20;
    let b = 19;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 2;
    let b = 8;
    console.log(a * b);
18. 18.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Kabir (d) Hi, name!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
21. 21.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 10;
    marks = marks - 10;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
23. 23.⚡ What number does this code print?
    let a = 13;
    let b = 6;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 46;
    let b = 40;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
27. 27.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Arjun! (d) Arjun
29. 29.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Aman! (d) Aman
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 10 (c) 46
31. 31.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
32. 32.⚡ What number does this code print?
    let a = 7;
    let b = 12;
    console.log(a * b);
33. 33.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
34. 34.⚡ What number does this code print?
    let a = 13;
    let b = 32;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let coins = 14;
    coins = coins + 6;
    coins = coins - 18;
    console.log(coins);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, name! (d) Welcome, Meera!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) Error (c) 51
39. 39.⚡ What number does this code print?
    let a = 49;
    let b = 31;
    console.log(a + b);
40. 40.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()

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