JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 957 · 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 = 32;
   let b = 27;
   console.log(a + b);
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 4;
   console.log(x + y); (a) Error (b) 6 (c) 24
3. 3.⚡ 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
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) for (c) console.log() (d) if
5. 5.⚡ What number does this code print?
   let marks = 28;
   marks = marks + 3;
   marks = marks - 28;
   console.log(marks);
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
7. 7.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 3;
   console.log(x + y); (a) 83 (b) 11 (c) Error
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
11. 11.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
12. 12.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
14. 14.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
15. 15.⚡ What number does this code print?
    let a = 12;
    let b = 27;
    console.log(a + b);
16. 16.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) Riya (d) name
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) 18 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
19. 19.⚡ What number does this code print?
    let score = 20;
    score = score + 3;
    score = score - 3;
    console.log(score);
20. 20.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 8;
    runs = runs - 34;
    console.log(runs);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 53 (b) 8 (c) Error
22. 22.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 13;
    apples = apples - 1;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 2;
    marks = marks - 7;
    console.log(marks);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) Error (c) 36
25. 25.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 17;
    marks = marks - 32;
    console.log(marks);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
27. 27.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 7;
    coins = coins - 9;
    console.log(coins);
28. 28.⚡ What number does this code print?
    let books = 19;
    books = books + 11;
    books = books - 23;
    console.log(books);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
30. 30.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
31. 31.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 15;
    runs = runs - 18;
    console.log(runs);
32. 32.⚡ What number does this code print?
    let a = 19;
    let b = 14;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let a = 23;
    let b = 5;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 19;
    let b = 17;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 13;
    coins = coins - 3;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) Hi, Zoya! (d) name
37. 37.⚡ 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
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 7;
    console.log(a * b);

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