JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 905 · 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 apples = 21;
   apples = apples + 7;
   apples = apples - 17;
   console.log(apples);
2. 2.⚡ What number does this code print?
   let runs = 10;
   runs = runs + 13;
   runs = runs - 19;
   console.log(runs);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) console.log()
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) for (d) if
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 3;
   console.log(x + y); (a) Error (b) 53 (c) 8
6. 6.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <script> (d) <js>
7. 7.⚡ What number does this code print?
   let runs = 25;
   runs = runs + 14;
   runs = runs - 38;
   console.log(runs);
8. 8.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 7;
   console.log(x + y); (a) 16 (b) Error (c) 97
10. 10.⚡ What number does this code print?
    let score = 5;
    score = score + 3;
    score = score - 3;
    console.log(score);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
12. 12.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) Hello, name! (d) name
13. 13.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) for
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) 12 (c) Error
15. 15.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 62 (b) Error (c) 8
18. 18.⚡ Which word makes a new variable? (a) give (b) let (c) put (d) make
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 39;
    console.log(a + b);
20. 20.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 5 (c) 23
22. 22.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, Kabir! (d) Hi, name!
23. 23.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) Well done, Arjun! (d) name
24. 24.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 11;
    apples = apples - 28;
    console.log(apples);
25. 25.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
26. 26.⚡ What number does this code print?
    let a = 23;
    let b = 11;
    console.log(a - b);
27. 27.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
28. 28.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Riya (d) Well done, Riya!
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 8;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 19;
    let b = 11;
    console.log(a + b);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Well done, name! (d) Zoya
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Meera! (d) Meera
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 9;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 15;
    marks = marks - 31;
    console.log(marks);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 11 (b) Error (c) 74
37. 37.⚡ What number does this code print?
    let a = 27;
    let b = 11;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 8;
    let b = 7;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 4;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 3;
    runs = runs - 1;
    console.log(runs);

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