JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 510 · 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 = 53;
   let b = 28;
   console.log(a + b);
2. 2.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
3. 3.⚡ What number does this code print?
   let a = 31;
   let b = 15;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let score = 28;
   score = score + 14;
   score = score - 25;
   console.log(score);
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
7. 7.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
8. 8.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) only colours (d) the domain name
9. 9.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) let (d) console.log()
10. 10.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
11. 11.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
12. 12.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) if (d) for
13. 13.⚡ What number does this code print?
    let a = 12;
    let b = 4;
    console.log(a * b);
14. 14.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) Error (b) 44 (c) 8
16. 16.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) name (d) Well done, name!
17. 17.⚡ Which JavaScript word repeats code? (a) let (b) if (c) for (d) alert()
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
19. 19.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) alert()
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
21. 21.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
22. 22.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 3;
    runs = runs - 4;
    console.log(runs);
23. 23.⚡ What number does this code print?
    let a = 12;
    let b = 8;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let a = 29;
    let b = 1;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 13;
    let b = 8;
    console.log(a + b);
26. 26.⚡ What number does this code print?
    let a = 19;
    let b = 29;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 12;
    runs = runs - 1;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let score = 25;
    score = score + 12;
    score = score - 22;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
32. 32.⚡ What number does this code print?
    let a = 6;
    let b = 9;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 25;
    let b = 15;
    console.log(a + b);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
35. 35.⚡ What number does this code print?
    let a = 31;
    let b = 21;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let runs = 15;
    runs = runs + 13;
    runs = runs - 20;
    console.log(runs);
37. 37.⚡ What number does this code print?
    let a = 17;
    let b = 27;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let score = 25;
    score = score + 13;
    score = score - 1;
    console.log(score);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) 15 (c) Error
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) 10 (c) Error

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