JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 847 · 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 print? (Look at the quotes!)
   let x = "4";
   let y = 2;
   console.log(x + y); (a) 42 (b) Error (c) 6
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 40;
   console.log(a + b);
3. 3.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 4;
   coins = coins - 4;
   console.log(coins);
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) for
5. 5.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
6. 6.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) for (d) alert()
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 5;
   console.log(x + y); (a) 95 (b) Error (c) 14
8. 8.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 5;
   console.log(x + y); (a) Error (b) 85 (c) 13
10. 10.⚡ What number does this code print?
    let a = 19;
    let b = 37;
    console.log(a + b);
11. 11.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) console.log() (d) let
12. 12.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
13. 13.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
14. 14.⚡ 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
15. 15.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
16. 16.⚡ What number does this code print?
    let a = 51;
    let b = 2;
    console.log(a + b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
18. 18.⚡ What number does this code print?
    let a = 19;
    let b = 32;
    console.log(a + b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 4;
    console.log(x + y); (a) 9 (b) 54 (c) Error
20. 20.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) Well done, name! (d) name
21. 21.⚡ What number does this code print?
    let a = 13;
    let b = 23;
    console.log(a + b);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
23. 23.⚡ What number does this code print?
    let a = 29;
    let b = 16;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) name (d) Well done, name!
25. 25.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) let (d) console.log()
26. 26.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
27. 27.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 4;
    runs = runs - 3;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) Hello, name! (c) name (d) Zoya
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) Error (b) 84 (c) 12
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
31. 31.⚡ What number does this code print?
    let a = 35;
    let b = 5;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 78 (c) 15
33. 33.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Meera! (d) Meera
34. 34.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Meera! (c) Meera (d) Hi, name!
35. 35.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Aman (d) Hello, Aman!
36. 36.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 6;
    coins = coins - 9;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 32;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) name (d) Hello, name!
39. 39.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Arjun (c) name (d) Well done, Arjun!
40. 40.⚡ What number does this code print?
    let a = 17;
    let b = 11;
    console.log(a - b);

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