JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 379 · 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 = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
5. 5.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) alert() (d) let
6. 6.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Hi, Kabir! (b) name (c) Hi, name! (d) Kabir
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name
8. 8.⚡ What does this code show?
   let name = "Arjun";
   alert("Hello, " + name + "!"); (a) Arjun (b) name (c) Hello, name! (d) Hello, Arjun!
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) the page title (d) only colours
10. 10.⚡ What number does this code print?
    let score = 9;
    score = score + 3;
    score = score - 7;
    console.log(score);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) for
12. 12.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
13. 13.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) Error (b) 15 (c) 6
15. 15.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 2;
    runs = runs - 9;
    console.log(runs);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) 74 (b) 11 (c) Error
17. 17.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 18;
    marks = marks - 3;
    console.log(marks);
18. 18.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
19. 19.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 2;
    apples = apples - 16;
    console.log(apples);
20. 20.⚡ What number does this code print?
    let books = 20;
    books = books + 11;
    books = books - 19;
    console.log(books);
21. 21.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) Hi, name! (c) Arjun (d) name
22. 22.⚡ What number does this code print?
    let a = 4;
    let b = 8;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 43;
    let b = 10;
    console.log(a - b);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) 4 (b) 22 (c) Error
25. 25.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) console.log() (d) for
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) Error (c) 11
27. 27.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) let (d) alert()
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) Error (b) 12 (c) 48
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) Error (b) 19 (c) 10
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) name (d) Aman
33. 33.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 14;
    coins = coins - 28;
    console.log(coins);
34. 34.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Aman! (c) Hi, name! (d) Aman
36. 36.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
37. 37.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 97 (c) 16
39. 39.⚡ 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
40. 40.⚡ What number does this code print?
    let a = 51;
    let b = 37;
    console.log(a - b);

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