JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 881 · 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 = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Kabir (d) Hello, name!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 3;
   console.log(x + y); (a) 23 (b) 5 (c) Error
3. 3.⚡ What number does this code print?
   let a = 8;
   let b = 8;
   console.log(a * b);
4. 4.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) console.log() (d) for
5. 5.⚡ What number does this code print?
   let a = 12;
   let b = 6;
   console.log(a * b);
6. 6.⚡ What does JavaScript add to a web page? (a) only colours (b) actions and changes (c) the page title (d) the domain name
7. 7.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
8. 8.⚡ 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
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) 13 (b) 94 (c) Error
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) if (b) let (c) for (d) alert()
11. 11.⚡ What number does this code print?
    let score = 30;
    score = score + 3;
    score = score - 11;
    console.log(score);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) Error (b) 13 (c) 58
13. 13.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
14. 14.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Zoya! (c) Zoya (d) name
15. 15.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) for (d) alert()
16. 16.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) for
17. 17.⚡ What number does this code print?
    let a = 47;
    let b = 35;
    console.log(a + b);
18. 18.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Meera (d) Well done, Meera!
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 35 (b) Error (c) 8
20. 20.⚡ What number does this code print?
    let a = 9;
    let b = 32;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 9 (b) 27 (c) Error
22. 22.⚡ 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
23. 23.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
24. 24.⚡ What number does this code print?
    let score = 17;
    score = score + 19;
    score = score - 20;
    console.log(score);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) Error (b) 75 (c) 12
26. 26.⚡ What number does this code print?
    let score = 13;
    score = score + 13;
    score = score - 16;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 10;
    let b = 32;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 15;
    apples = apples - 9;
    console.log(apples);
29. 29.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
30. 30.⚡ What number does this code print?
    let a = 22;
    let b = 16;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 9;
    apples = apples - 8;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 19;
    console.log(a - b);
33. 33.⚡ What number does this code print?
    let apples = 7;
    apples = apples + 7;
    apples = apples - 8;
    console.log(apples);
34. 34.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Riya (d) Hi, Riya!
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Riya! (b) name (c) Welcome, name! (d) Riya
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) Error (b) 11 (c) 65
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) 12 (c) Error
38. 38.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) name (b) Meera (c) Hi, Meera! (d) Hi, name!
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Meera! (d) Meera

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