JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 217 · 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 = "Meera";
   alert("Well done, " + name + "!"); (a) name (b) Well done, Meera! (c) Well done, name! (d) Meera
2. 2.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) alert() (d) if
3. 3.⚡ What number does this code print?
   let a = 9;
   let b = 6;
   console.log(a * b);
4. 4.⚡ What number does this code print?
   let a = 60;
   let b = 14;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 9;
   let b = 17;
   console.log(a + b);
6. 6.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .jpg (d) .css
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) name (d) Kabir
8. 8.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
9. 9.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) if (c) let (d) alert()
11. 11.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 17;
    coins = coins - 25;
    console.log(coins);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 7;
    console.log(x + y); (a) Error (b) 8 (c) 17
13. 13.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 10;
    apples = apples - 6;
    console.log(apples);
14. 14.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 4;
    marks = marks - 27;
    console.log(marks);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) Error (b) 41 (c) 5
16. 16.⚡ What number does this code print?
    let a = 13;
    let b = 22;
    console.log(a + b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
18. 18.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, Arjun! (d) Well done, name!
19. 19.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
20. 20.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
21. 21.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
22. 22.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
23. 23.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
24. 24.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Kabir (c) Hi, name! (d) Hi, Kabir!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 99 (b) Error (c) 18
26. 26.⚡ What number does this code print?
    let a = 6;
    let b = 14;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
28. 28.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) 43 (c) Error
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 11 (c) 56
32. 32.⚡ 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
33. 33.⚡ What number does this code print?
    let a = 50;
    let b = 26;
    console.log(a - b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) 12 (c) Error
35. 35.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 8;
    runs = runs - 5;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 56;
    let b = 36;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let books = 28;
    books = books + 9;
    books = books - 16;
    console.log(books);
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
39. 39.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 17;
    marks = marks - 3;
    console.log(marks);

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