JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 754 · 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 = 6;
   let b = 14;
   console.log(a + b);
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 14 (b) Error (c) 95
4. 4.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) for (d) alert()
5. 5.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
6. 6.⚡ What number does this code print?
   let coins = 9;
   coins = coins + 12;
   coins = coins - 17;
   console.log(coins);
7. 7.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) for
8. 8.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
9. 9.⚡ What number does this code print?
   let a = 7;
   let b = 5;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) name (c) Arjun (d) Well done, name!
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
13. 13.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
14. 14.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the domain name (d) the page title
15. 15.⚡ What number does this code print?
    let a = 46;
    let b = 10;
    console.log(a + b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
17. 17.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) let
18. 18.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 9;
    marks = marks - 5;
    console.log(marks);
19. 19.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
20. 20.⚡ What number does this code print?
    let a = 23;
    let b = 4;
    console.log(a + b);
21. 21.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) Error (b) 85 (c) 13
25. 25.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 7;
    marks = marks - 12;
    console.log(marks);
26. 26.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 5;
    runs = runs - 5;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
28. 28.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
29. 29.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 20;
    apples = apples - 4;
    console.log(apples);
30. 30.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, Meera! (b) Hi, name! (c) Meera (d) name
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Riya (d) Welcome, Riya!
33. 33.⚡ What number does this code print?
    let score = 20;
    score = score + 9;
    score = score - 25;
    console.log(score);
34. 34.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 10;
    coins = coins - 10;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9
37. 37.⚡ 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
38. 38.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 20;
    marks = marks - 14;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 10;
    runs = runs - 6;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 51;
    let b = 26;
    console.log(a - b);

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