JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 795 · 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.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) alert() (d) for
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the title bar (d) on the printer
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <style> (d) <js>
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) if (d) let
5. 5.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) name (d) Zoya
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
8. 8.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!
9. 9.⚡ What number does this code print?
   let score = 18;
   score = score + 9;
   score = score - 3;
   console.log(score);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) 16 (c) Error
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) 7 (b) Error (c) 25
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) 13 (b) Error (c) 94
13. 13.⚡ What number does this code print?
    let a = 34;
    let b = 11;
    console.log(a - b);
14. 14.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) alert()
16. 16.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 16;
    marks = marks - 9;
    console.log(marks);
17. 17.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
18. 18.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 19;
    marks = marks - 2;
    console.log(marks);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) Error (b) 34 (c) 7
21. 21.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
22. 22.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
23. 23.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
24. 24.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 12;
    apples = apples - 3;
    console.log(apples);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) 64 (c) Error
26. 26.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 4;
    marks = marks - 3;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 10;
    coins = coins - 18;
    console.log(coins);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
29. 29.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 20;
    marks = marks - 21;
    console.log(marks);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) 91 (c) Error
31. 31.⚡ What number does this code print?
    let a = 15;
    let b = 1;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) 3 (c) Error
34. 34.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Riya (c) Hi, name! (d) name
35. 35.⚡ What number does this code print?
    let marks = 17;
    marks = marks + 6;
    marks = marks - 10;
    console.log(marks);
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) Error (c) 27
38. 38.⚡ What number does this code print?
    let a = 60;
    let b = 5;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 5;
    runs = runs - 8;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);

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