JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 517 · 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 = 17;
   let b = 13;
   console.log(a - b);
2. 2.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
3. 3.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
4. 4.⚡ What does this code show?
   let name = "Meera";
   console.log("Hello, " + name + "!"); (a) Hello, Meera! (b) Meera (c) name (d) Hello, name!
5. 5.⚡ What number does this code print?
   let a = 10;
   let b = 9;
   console.log(a + b);
6. 6.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
7. 7.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) name (c) Hello, name! (d) Hello, Aman!
8. 8.⚡ Which JavaScript word writes in the console? (a) for (b) if (c) console.log() (d) alert()
9. 9.⚡ What number does this code print?
   let a = 10;
   let b = 2;
   console.log(a * b);
10. 10.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) name (c) Well done, Zoya! (d) Well done, name!
11. 11.⚡ What number does this code print?
    let a = 35;
    let b = 32;
    console.log(a - b);
12. 12.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
13. 13.⚡ What number does this code print?
    let coins = 16;
    coins = coins + 8;
    coins = coins - 15;
    console.log(coins);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) 8 (b) Error (c) 71
15. 15.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
16. 16.⚡ What number does this code print?
    let a = 9;
    let b = 1;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 10 (b) Error (c) 46
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) if (d) for
19. 19.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) console.log() (d) for
20. 20.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) let (d) if
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 33 (b) Error (c) 6
22. 22.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) 14 (b) Error (c) 68
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
25. 25.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, name! (c) Hello, Arjun! (d) name
27. 27.⚡ What number does this code print?
    let a = 8;
    let b = 5;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let score = 19;
    score = score + 4;
    score = score - 5;
    console.log(score);
29. 29.⚡ What number does this code print?
    let a = 28;
    let b = 15;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 18;
    marks = marks - 13;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
34. 34.⚡ What number does this code print?
    let a = 59;
    let b = 13;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let coins = 11;
    coins = coins + 11;
    coins = coins - 8;
    console.log(coins);
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
37. 37.⚡ What number does this code print?
    let a = 29;
    let b = 23;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 14;
    marks = marks - 7;
    console.log(marks);
39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 11;
    console.log(a * b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 6 (c) 15

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