JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 825 · 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 runs = 24;
   runs = runs + 8;
   runs = runs - 5;
   console.log(runs);
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) name (d) Well done, Riya!
3. 3.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
4. 4.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Kabir (d) Hello, name!
5. 5.⚡ 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
6. 6.⚡ What number does this code print?
   let a = 16;
   let b = 10;
   console.log(a - b);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
8. 8.⚡ What number does this code print?
   let a = 19;
   let b = 14;
   console.log(a - b);
9. 9.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
10. 10.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) for
11. 11.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
12. 12.⚡ What number does this code print?
    let a = 3;
    let b = 2;
    console.log(a * b);
13. 13.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) for (d) let
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, name! (d) Welcome, Arjun!
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
16. 16.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
18. 18.⚡ What number does this code print?
    let runs = 26;
    runs = runs + 2;
    runs = runs - 8;
    console.log(runs);
19. 19.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
20. 20.⚡ What number does this code print?
    let a = 59;
    let b = 19;
    console.log(a + b);
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Meera (c) Hello, name! (d) Hello, Meera!
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) 72 (c) Error
23. 23.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
24. 24.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) alert()
25. 25.⚡ What number does this code print?
    let a = 46;
    let b = 4;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 36;
    let b = 24;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
28. 28.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
29. 29.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) Error (b) 45 (c) 9
32. 32.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 16;
    marks = marks - 1;
    console.log(marks);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) name (d) Hi, name!
35. 35.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 2;
    runs = runs - 9;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let score = 12;
    score = score + 15;
    score = score - 1;
    console.log(score);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
38. 38.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 16;
    marks = marks - 15;
    console.log(marks);
39. 39.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) Error (c) 78

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