JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 125 · 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 = 24;
   let b = 22;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 33;
   let b = 13;
   console.log(a - b);
3. 3.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
4. 4.⚡ What number does this code print?
   let score = 23;
   score = score + 13;
   score = score - 7;
   console.log(score);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) let
6. 6.⚡ What number does this code print?
   let a = 12;
   let b = 3;
   console.log(a * b);
7. 7.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
8. 8.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) for
9. 9.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) alert()
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) Error (b) 96 (c) 15
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Zoya (d) Hello, Zoya!
12. 12.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 20;
    runs = runs - 6;
    console.log(runs);
13. 13.⚡ What number does this code print?
    let score = 9;
    score = score + 16;
    score = score - 2;
    console.log(score);
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
15. 15.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 5;
    runs = runs - 7;
    console.log(runs);
16. 16.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 64 (b) 10 (c) Error
19. 19.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) Hello, name! (d) name
21. 21.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
22. 22.⚡ What number does this code print?
    let a = 6;
    let b = 23;
    console.log(a + b);
23. 23.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) alert() (d) let
24. 24.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 17;
    marks = marks - 10;
    console.log(marks);
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) name (d) Riya
26. 26.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) Hi, Meera! (c) name (d) Hi, name!
27. 27.⚡ What number does this code print?
    let a = 39;
    let b = 40;
    console.log(a + b);
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
29. 29.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) in the address bar (d) on the printer
30. 30.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
32. 32.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
33. 33.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
34. 34.⚡ What number does this code print?
    let a = 49;
    let b = 38;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
38. 38.⚡ What number does this code print?
    let a = 22;
    let b = 20;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
40. 40.⚡ What number does this code print?
    let a = 24;
    let b = 8;
    console.log(a + b);

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