JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 668 · 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 show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) name (d) Hi, Zoya!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 8;
   console.log(x + y); (a) Error (b) 38 (c) 11
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
4. 4.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
5. 5.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) console.log()
6. 6.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
7. 7.⚡ What number does this code print?
   let coins = 18;
   coins = coins + 9;
   coins = coins - 13;
   console.log(coins);
8. 8.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) alert()
9. 9.⚡ What number does this code print?
   let runs = 22;
   runs = runs + 2;
   runs = runs - 24;
   console.log(runs);
10. 10.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
11. 11.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 5;
    apples = apples - 4;
    console.log(apples);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
13. 13.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) alert()
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) Error (c) 11
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 67 (b) 13 (c) Error
16. 16.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) for (d) alert()
19. 19.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 3;
    marks = marks - 15;
    console.log(marks);
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Arjun! (c) Arjun (d) Well done, name!
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Meera (c) Welcome, name! (d) name
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
24. 24.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
25. 25.⚡ What number does this code print?
    let a = 22;
    let b = 37;
    console.log(a + b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) 89 (b) 17 (c) Error
28. 28.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 11;
    coins = coins - 11;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let a = 54;
    let b = 4;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 12;
    console.log(a * b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 5;
    console.log(x + y); (a) 13 (b) Error (c) 85
33. 33.⚡ What number does this code print?
    let a = 13;
    let b = 5;
    console.log(a - b);
34. 34.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
35. 35.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, name! (d) Hi, Kabir!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
39. 39.⚡ What number does this code print?
    let a = 30;
    let b = 32;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) 17 (b) Error (c) 8

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