JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 588 · 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 = "7";
   let y = 1;
   console.log(x + y); (a) Error (b) 8 (c) 71
2. 2.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) for (d) if
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 2;
   console.log(x + y); (a) Error (b) 7 (c) 52
4. 4.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Zoya! (d) Zoya
6. 6.⚡ What does this code show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) Hello, Aman! (d) name
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 89 (b) 17 (c) Error
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) 8 (b) 62 (c) Error
9. 9.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) console.log()
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) 16 (c) Error
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 2 (c) 11
13. 13.⚡ What number does this code print?
    let a = 24;
    let b = 26;
    console.log(a + b);
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) alert() (d) console.log()
15. 15.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 20;
    apples = apples - 33;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Kabir (d) Hello, Kabir!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 44 (b) Error (c) 8
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) Welcome, name! (d) name
19. 19.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) name (d) Welcome, name!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) Error (c) 9
22. 22.⚡ What number does this code print?
    let score = 7;
    score = score + 2;
    score = score - 1;
    console.log(score);
23. 23.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) on the title bar (d) in the address bar
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
25. 25.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
26. 26.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 8;
    apples = apples - 16;
    console.log(apples);
27. 27.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) alert()
28. 28.⚡ What number does this code print?
    let a = 13;
    let b = 2;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 1;
    console.log(x + y); (a) 5 (b) 41 (c) Error
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a - b);
32. 32.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
33. 33.⚡ What number does this code print?
    let apples = 6;
    apples = apples + 19;
    apples = apples - 21;
    console.log(apples);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 11;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
37. 37.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) if
38. 38.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 18;
    apples = apples - 27;
    console.log(apples);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Aman (c) Hi, name! (d) name
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 75 (b) 12 (c) Error

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