JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 538 · 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 does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) Error (b) 21 (c) 3
2. 2.⚡ What number does this code print?
   let a = 4;
   let b = 8;
   console.log(a * b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 9;
   console.log(x + y); (a) 11 (b) 29 (c) Error
4. 4.⚡ What number does this code print?
   let score = 25;
   score = score + 5;
   score = score - 9;
   console.log(score);
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
6. 6.⚡ What number does this code print?
   let runs = 23;
   runs = runs + 16;
   runs = runs - 16;
   console.log(runs);
7. 7.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) actions and changes (d) only colours
8. 8.⚡ What number does this code print?
   let score = 28;
   score = score + 10;
   score = score - 2;
   console.log(score);
9. 9.⚡ What number does this code print?
   let a = 9;
   let b = 36;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let score = 11;
    score = score + 5;
    score = score - 5;
    console.log(score);
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.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) Error (b) 69 (c) 15
13. 13.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 16;
    runs = runs - 21;
    console.log(runs);
14. 14.⚡ What number does this code print?
    let a = 10;
    let b = 9;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) Error (c) 91
17. 17.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) let (d) if
18. 18.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
19. 19.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 7;
    runs = runs - 6;
    console.log(runs);
20. 20.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
21. 21.⚡ What number does this code print?
    let score = 29;
    score = score + 9;
    score = score - 9;
    console.log(score);
22. 22.⚡ What number does this code print?
    let a = 41;
    let b = 13;
    console.log(a - b);
23. 23.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
24. 24.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) let (d) alert()
25. 25.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) alert()
26. 26.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 12;
    runs = runs - 7;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 10;
    runs = runs - 7;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let a = 46;
    let b = 15;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 20;
    apples = apples - 20;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let a = 36;
    let b = 35;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let a = 38;
    let b = 32;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) Error (c) 22
33. 33.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 19;
    apples = apples - 6;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
35. 35.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 5;
    apples = apples - 10;
    console.log(apples);
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
37. 37.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 7;
    runs = runs - 12;
    console.log(runs);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) 6 (b) Error (c) 24
39. 39.⚡ What number does this code print?
    let score = 19;
    score = score + 10;
    score = score - 28;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);

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