JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 40 · 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.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
2. 2.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) the page title (d) actions and changes
3. 3.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) let (c) alert() (d) for
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) let (d) alert()
6. 6.⚡ What number does this code print?
   let runs = 12;
   runs = runs + 2;
   runs = runs - 2;
   console.log(runs);
7. 7.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) if (d) console.log()
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) Error (b) 16 (c) 7
9. 9.⚡ Which JavaScript word runs code when true? (a) if (b) console.log() (c) for (d) alert()
10. 10.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 12;
    apples = apples - 30;
    console.log(apples);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) name (d) Riya
12. 12.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 6;
    apples = apples - 18;
    console.log(apples);
13. 13.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
14. 14.⚡ 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
15. 15.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 16;
    apples = apples - 22;
    console.log(apples);
16. 16.⚡ What number does this code print?
    let a = 58;
    let b = 25;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 12;
    apples = apples - 6;
    console.log(apples);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
19. 19.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 12;
    apples = apples - 14;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 56 (b) 11 (c) Error
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .js (d) .css
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 47 (c) 11
23. 23.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, Zoya! (d) Welcome, name!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) 10 (c) Error
26. 26.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 5;
    marks = marks - 17;
    console.log(marks);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) Error (c) 12
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 12 (c) 93
29. 29.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
30. 30.⚡ What number does this code print?
    let a = 38;
    let b = 30;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 2;
    marks = marks - 18;
    console.log(marks);
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Riya! (d) Riya
33. 33.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) for
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
35. 35.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 30;
    let b = 8;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 53;
    let b = 39;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
40. 40.⚡ What number does this code print?
    let a = 29;
    let b = 38;
    console.log(a + b);

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