JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 78 · 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("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Riya (c) Welcome, name! (d) name
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let apples = 13;
   apples = apples + 15;
   apples = apples - 4;
   console.log(apples);
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) 64 (c) Error
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 12;
   console.log(a * b);
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Aman (d) Hi, Aman!
8. 8.⚡ What number does this code print?
   let a = 49;
   let b = 17;
   console.log(a - b);
9. 9.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) let
10. 10.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) name (c) Well done, Aman! (d) Well done, name!
11. 11.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Riya (d) Hi, Riya!
13. 13.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 2;
    marks = marks - 4;
    console.log(marks);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, Zoya! (d) Welcome, name!
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) alert() (d) let
16. 16.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 15;
    apples = apples - 26;
    console.log(apples);
17. 17.⚡ What number does this code print?
    let books = 6;
    books = books + 10;
    books = books - 2;
    console.log(books);
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 40;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 2;
    apples = apples - 13;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let a = 10;
    let b = 11;
    console.log(a * b);
21. 21.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) let (d) for
22. 22.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) if (d) for
23. 23.⚡ What number does this code print?
    let a = 18;
    let b = 24;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let a = 51;
    let b = 16;
    console.log(a - b);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
26. 26.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
27. 27.⚡ What number does this code print?
    let a = 54;
    let b = 9;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
29. 29.⚡ What number does this code print?
    let a = 14;
    let b = 38;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let books = 19;
    books = books + 3;
    books = books - 3;
    console.log(books);
31. 31.⚡ What number does this code print?
    let score = 28;
    score = score + 6;
    score = score - 18;
    console.log(score);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Meera! (c) name (d) Meera
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let a = 7;
    let b = 28;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
38. 38.⚡ What number does this code print?
    let books = 13;
    books = books + 2;
    books = books - 2;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Riya! (d) Riya

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