JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 267 · 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 coins = 14;
   coins = coins + 13;
   coins = coins - 5;
   console.log(coins);
2. 2.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) name (d) Welcome, name!
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
6. 6.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) 10 (b) Error (c) 19
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
9. 9.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) if (d) for
10. 10.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
12. 12.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
13. 13.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 6;
    coins = coins - 5;
    console.log(coins);
14. 14.⚡ Which JavaScript word makes a new variable? (a) let (b) for (c) alert() (d) if
15. 15.⚡ What number does this code print?
    let a = 31;
    let b = 8;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let a = 26;
    let b = 5;
    console.log(a - b);
17. 17.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
18. 18.⚡ What number does this code print?
    let a = 25;
    let b = 9;
    console.log(a - b);
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
20. 20.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
21. 21.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 8;
    apples = apples - 17;
    console.log(apples);
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 76 (b) 13 (c) Error
25. 25.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Arjun! (c) Arjun (d) name
26. 26.⚡ What number does this code print?
    let a = 44;
    let b = 11;
    console.log(a - b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, Arjun! (d) Hello, name!
28. 28.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 94 (b) 13 (c) Error
30. 30.⚡ What number does this code print?
    let a = 26;
    let b = 15;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 54 (b) 9 (c) Error
32. 32.⚡ What number does this code print?
    let a = 35;
    let b = 3;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) Error (b) 6 (c) 33
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 21 (c) 3
35. 35.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 14;
    coins = coins - 36;
    console.log(coins);
36. 36.⚡ What number does this code print?
    let score = 7;
    score = score + 9;
    score = score - 6;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Kabir (d) Well done, name!
38. 38.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 58 (c) 13
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32

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