JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 816 · 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 = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, Aman! (d) Hello, name!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 8;
   console.log(x + y); (a) 9 (b) Error (c) 18
3. 3.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Kabir (c) Well done, Kabir! (d) name
4. 4.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 10;
   console.log(a * b);
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) for
7. 7.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
8. 8.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
9. 9.⚡ What number does this code print?
   let a = 31;
   let b = 22;
   console.log(a - b);
10. 10.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
11. 11.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) if (d) alert()
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Aman! (c) name (d) Aman
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) Error (c) 21
14. 14.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
15. 15.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
16. 16.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) for (d) if
17. 17.⚡ What number does this code print?
    let marks = 6;
    marks = marks + 12;
    marks = marks - 4;
    console.log(marks);
18. 18.⚡ What number does this code print?
    let a = 14;
    let b = 5;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 57;
    let b = 8;
    console.log(a - b);
20. 20.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) if (d) console.log()
21. 21.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
22. 22.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Arjun! (c) name (d) Arjun
23. 23.⚡ What number does this code print?
    let a = 54;
    let b = 27;
    console.log(a - b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) Error (c) 33
25. 25.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, name! (d) Well done, Kabir!
26. 26.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 4;
    runs = runs - 7;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 14;
    coins = coins - 25;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 36;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) Error (c) 16
32. 32.⚡ What number does this code print?
    let a = 9;
    let b = 8;
    console.log(a * b);
33. 33.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) console.log() (d) for
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 43 (b) Error (c) 7
35. 35.⚡ What number does this code print?
    let a = 49;
    let b = 7;
    console.log(a - b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
38. 38.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
39. 39.⚡ What number does this code print?
    let a = 34;
    let b = 28;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let a = 16;
    let b = 20;
    console.log(a + b);

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