JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 11 · 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 tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 5;
   let b = 3;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let runs = 25;
   runs = runs + 12;
   runs = runs - 30;
   console.log(runs);
5. 5.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 75 (b) Error (c) 12
7. 7.⚡ What number does this code print?
   let runs = 27;
   runs = runs + 6;
   runs = runs - 16;
   console.log(runs);
8. 8.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Arjun! (c) Arjun (d) Welcome, name!
9. 9.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a table (d) a picture
10. 10.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) for
11. 11.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 5;
    runs = runs - 26;
    console.log(runs);
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
13. 13.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 14 (b) 95 (c) Error
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 13 (c) 4
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 10 (b) Error (c) 82
17. 17.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 8;
    apples = apples - 6;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 4;
    marks = marks - 2;
    console.log(marks);
19. 19.⚡ What number does this code print?
    let score = 8;
    score = score + 12;
    score = score - 13;
    console.log(score);
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Riya! (d) Riya
21. 21.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
23. 23.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
24. 24.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) let (d) alert()
25. 25.⚡ What number does this code print?
    let score = 8;
    score = score + 4;
    score = score - 10;
    console.log(score);
26. 26.⚡ Which word makes a new variable? (a) put (b) let (c) give (d) make
27. 27.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 10;
    apples = apples - 6;
    console.log(apples);
28. 28.⚡ What number does this code print?
    let books = 19;
    books = books + 12;
    books = books - 23;
    console.log(books);
29. 29.⚡ What number does this code print?
    let a = 26;
    let b = 12;
    console.log(a - b);
30. 30.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, name! (d) Hi, Meera!
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, name! (c) name (d) Hi, Aman!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 8 (b) 26 (c) Error
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Zoya (d) Welcome, Zoya!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, name! (c) Well done, Arjun! (d) name
36. 36.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 59 (c) 14
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) Error (c) 84
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 4;
    console.log(x + y); (a) 10 (b) Error (c) 64
40. 40.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) let

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