JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 129 · 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 writes in the console? (a) let (b) for (c) if (d) console.log()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) Error (b) 11 (c) 92
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) if
4. 4.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) console.log() (d) if
5. 5.⚡ What number does this code print?
   let coins = 25;
   coins = coins + 8;
   coins = coins - 21;
   console.log(coins);
6. 6.⚡ What number does this code print?
   let a = 8;
   let b = 3;
   console.log(a - b);
7. 7.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Kabir (b) Well done, Kabir! (c) name (d) Well done, name!
8. 8.⚡ What number does this code print?
   let a = 47;
   let b = 16;
   console.log(a + b);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 45 (b) 9 (c) Error
10. 10.⚡ What number does this code print?
    let a = 4;
    let b = 7;
    console.log(a * b);
11. 11.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
12. 12.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 5;
    runs = runs - 4;
    console.log(runs);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) Welcome, Kabir! (d) name
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .css (d) .html
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, name! (d) Welcome, Riya!
16. 16.⚡ What number does this code print?
    let a = 32;
    let b = 14;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 33;
    let b = 14;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 13;
    runs = runs - 15;
    console.log(runs);
19. 19.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 16;
    marks = marks - 20;
    console.log(marks);
20. 20.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 19;
    coins = coins - 37;
    console.log(coins);
21. 21.⚡ Where does console.log() show its output? (a) on the title bar (b) in the console (c) on the printer (d) in the address bar
22. 22.⚡ What number does this code print?
    let a = 60;
    let b = 19;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 13;
    coins = coins - 21;
    console.log(coins);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
25. 25.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
26. 26.⚡ What number does this code print?
    let books = 20;
    books = books + 2;
    books = books - 22;
    console.log(books);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
28. 28.⚡ What number does this code print?
    let marks = 27;
    marks = marks + 20;
    marks = marks - 38;
    console.log(marks);
29. 29.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the page title (c) the domain name (d) only colours
30. 30.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
31. 31.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
32. 32.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 10;
    console.log(a * b);
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) name (d) Well done, Meera!
35. 35.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) alert() (d) for
36. 36.⚡ What number does this code print?
    let a = 30;
    let b = 8;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 55;
    let b = 4;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) Hello, name! (d) name
39. 39.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) if (d) let
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 63 (b) Error (c) 9

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