JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 298 · 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 makes a new variable? (a) console.log() (b) let (c) if (d) alert()
2. 2.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) Error (b) 17 (c) 89
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 9;
   console.log(x + y); (a) Error (b) 49 (c) 13
7. 7.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
8. 8.⚡ What does alert() show? (a) a new tab (b) a picture (c) a table (d) a pop-up box
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 95 (c) 14
11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Arjun (d) Welcome, name!
12. 12.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
13. 13.⚡ 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
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) console.log()
16. 16.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) name (d) Welcome, Aman!
17. 17.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Zoya! (c) name (d) Zoya
18. 18.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) let (d) for
19. 19.⚡ What number does this code print?
    let a = 8;
    let b = 17;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
21. 21.⚡ What number does this code print?
    let a = 23;
    let b = 24;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 19;
    let b = 6;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 5;
    runs = runs - 17;
    console.log(runs);
24. 24.⚡ What number does this code print?
    let a = 3;
    let b = 7;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let score = 5;
    score = score + 6;
    score = score - 3;
    console.log(score);
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Arjun (d) Hi, Arjun!
27. 27.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 3;
    runs = runs - 22;
    console.log(runs);
28. 28.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 4;
    coins = coins - 12;
    console.log(coins);
29. 29.⚡ What number does this code print?
    let books = 25;
    books = books + 3;
    books = books - 1;
    console.log(books);
30. 30.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
31. 31.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
32. 32.⚡ What number does this code print?
    let a = 11;
    let b = 10;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 17;
    apples = apples - 25;
    console.log(apples);
34. 34.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 8;
    marks = marks - 3;
    console.log(marks);
35. 35.⚡ 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
36. 36.⚡ What number does this code print?
    let a = 10;
    let b = 6;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 37;
    let b = 39;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a + b);
39. 39.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
40. 40.⚡ What number does this code print?
    let a = 20;
    let b = 21;
    console.log(a + b);

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