JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 434 · 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 = "Arjun";
   alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Hello, name! (c) Arjun (d) name
2. 2.⚡ What number does this code print?
   let coins = 19;
   coins = coins + 15;
   coins = coins - 2;
   console.log(coins);
3. 3.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
4. 4.⚡ Which JavaScript word repeats code? (a) if (b) for (c) let (d) console.log()
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 2;
   console.log(x + y); (a) 72 (b) Error (c) 9
6. 6.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a picture (d) a table
7. 7.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
8. 8.⚡ What number does this code print?
   let a = 11;
   let b = 37;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
10. 10.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <code> (c) <js> (d) <script>
11. 11.⚡ What number does this code print?
    let a = 30;
    let b = 21;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) console.log() (d) alert()
14. 14.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Aman (c) Welcome, Aman! (d) name
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) if (d) let
16. 16.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 5;
    runs = runs - 2;
    console.log(runs);
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
18. 18.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Kabir (d) Welcome, Kabir!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) 99 (c) Error
20. 20.⚡ What number does this code print?
    let score = 24;
    score = score + 18;
    score = score - 38;
    console.log(score);
21. 21.⚡ What number does this code print?
    let books = 24;
    books = books + 9;
    books = books - 22;
    console.log(books);
22. 22.⚡ What number does this code print?
    let a = 36;
    let b = 33;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 8;
    let b = 8;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) Aman (d) name
25. 25.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) console.log() (d) for
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 11 (b) 29 (c) Error
27. 27.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
28. 28.⚡ What number does this code print?
    let a = 21;
    let b = 23;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let a = 30;
    let b = 12;
    console.log(a - b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) Error (c) 19
31. 31.⚡ What number does this code print?
    let a = 6;
    let b = 9;
    console.log(a * b);
32. 32.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Meera! (d) Meera
33. 33.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
34. 34.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 2;
    coins = coins - 17;
    console.log(coins);
35. 35.⚡ Which JavaScript word writes in the console? (a) alert() (b) if (c) let (d) console.log()
36. 36.⚡ What number does this code print?
    let a = 4;
    let b = 5;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 20;
    runs = runs - 28;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 12;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let score = 28;
    score = score + 10;
    score = score - 24;
    console.log(score);

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