JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 578 · 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) if (c) alert() (d) console.log()
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 6;
   console.log(x + y); (a) 15 (b) 96 (c) Error
3. 3.⚡ What does this code show?
   let name = "Aman";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Aman! (d) Aman
4. 4.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) Zoya (d) name
5. 5.⚡ Which word makes a new variable? (a) let (b) put (c) make (d) give
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, Meera! (b) name (c) Hello, name! (d) Meera
7. 7.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
8. 8.⚡ What number does this code print?
   let a = 54;
   let b = 23;
   console.log(a + b);
9. 9.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) Riya (d) name
10. 10.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) let (d) for
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
12. 12.⚡ Which JavaScript word runs code when true? (a) if (b) let (c) console.log() (d) alert()
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 11 (b) 83 (c) Error
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) 34 (c) Error
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 28 (b) 10 (c) Error
16. 16.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 17;
    apples = apples - 5;
    console.log(apples);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) 12 (b) Error (c) 93
19. 19.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) if (d) alert()
21. 21.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
23. 23.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 7;
    apples = apples - 11;
    console.log(apples);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
25. 25.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Arjun! (c) Arjun (d) Hello, name!
26. 26.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
27. 27.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) the domain name (d) actions and changes
28. 28.⚡ What number does this code print?
    let a = 3;
    let b = 9;
    console.log(a * b);
29. 29.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 16;
    coins = coins - 2;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let a = 40;
    let b = 18;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) 7 (c) Error
32. 32.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
33. 33.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
34. 34.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) for (d) if
35. 35.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .js (d) .jpg
36. 36.⚡ What number does this code print?
    let a = 15;
    let b = 21;
    console.log(a + b);
37. 37.⚡ 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
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) Error (c) 2
39. 39.⚡ What number does this code print?
    let apples = 18;
    apples = apples + 2;
    apples = apples - 18;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 5;
    runs = runs - 15;
    console.log(runs);

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