JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 625 · 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";
   alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) Riya (d) name
2. 2.⚡ What number does this code print?
   let a = 44;
   let b = 4;
   console.log(a + b);
3. 3.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) let (d) for
4. 4.⚡ What number does this code print?
   let coins = 22;
   coins = coins + 10;
   coins = coins - 23;
   console.log(coins);
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) if (c) console.log() (d) for
6. 6.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) alert() (d) let
7. 7.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 17 (b) 89 (c) Error
9. 9.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
10. 10.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) if
12. 12.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
13. 13.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 16;
    apples = apples - 13;
    console.log(apples);
14. 14.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error
16. 16.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 20;
    apples = apples - 11;
    console.log(apples);
17. 17.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) Hello, name! (d) name
18. 18.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Arjun (d) Hello, name!
21. 21.⚡ 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
22. 22.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Hi, Zoya! (b) Hi, name! (c) Zoya (d) name
25. 25.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) Arjun (c) Hi, name! (d) name
29. 29.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 6;
    marks = marks - 13;
    console.log(marks);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
31. 31.⚡ What number does this code print?
    let a = 29;
    let b = 8;
    console.log(a + b);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
33. 33.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Meera (d) Hi, name!
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) Zoya (d) name
36. 36.⚡ What number does this code print?
    let score = 21;
    score = score + 18;
    score = score - 33;
    console.log(score);
37. 37.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
39. 39.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12

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