JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 678 · 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 number does this code print?
   let a = 4;
   let b = 10;
   console.log(a * b);
2. 2.⚡ What does this code show?
   let name = "Meera";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
3. 3.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) alert() (d) console.log()
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 2;
   console.log(a * b);
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
7. 7.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, Riya! (d) Hi, name!
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
12. 12.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
13. 13.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
14. 14.⚡ What number does this code print?
    let marks = 23;
    marks = marks + 12;
    marks = marks - 2;
    console.log(marks);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
16. 16.⚡ What number does this code print?
    let score = 19;
    score = score + 12;
    score = score - 23;
    console.log(score);
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Kabir! (d) Kabir
18. 18.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Aman! (c) Hello, name! (d) Aman
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) for (d) if
20. 20.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
21. 21.⚡ What number does this code print?
    let books = 15;
    books = books + 2;
    books = books - 16;
    console.log(books);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) 3 (c) Error
24. 24.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 14 (b) Error (c) 5
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Welcome, name! (d) Riya
29. 29.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) alert()
30. 30.⚡ What number does this code print?
    let a = 10;
    let b = 3;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 41;
    let b = 3;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 15 (c) 69
34. 34.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 8;
    marks = marks - 3;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 6;
    apples = apples - 13;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
38. 38.⚡ What number does this code print?
    let a = 36;
    let b = 25;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 34;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let score = 6;
    score = score + 6;
    score = score - 4;
    console.log(score);

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