JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 349 · 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 word makes a new variable? (a) make (b) put (c) let (d) give
2. 2.⚡ 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
3. 3.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) if
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 2;
   console.log(x + y); (a) 11 (b) 92 (c) Error
5. 5.⚡ What number does this code print?
   let runs = 15;
   runs = runs + 3;
   runs = runs - 17;
   console.log(runs);
6. 6.⚡ What number does this code print?
   let score = 6;
   score = score + 4;
   score = score - 6;
   console.log(score);
7. 7.⚡ What number does this code print?
   let apples = 16;
   apples = apples + 3;
   apples = apples - 4;
   console.log(apples);
8. 8.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
9. 9.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 7;
   coins = coins - 32;
   console.log(coins);
10. 10.⚡ What number does this code print?
    let a = 19;
    let b = 26;
    console.log(a + b);
11. 11.⚡ What number does this code print?
    let a = 47;
    let b = 24;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 16;
    marks = marks - 13;
    console.log(marks);
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) alert() (d) let
14. 14.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
15. 15.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 14;
    apples = apples - 26;
    console.log(apples);
16. 16.⚡ Which JavaScript word repeats code? (a) console.log() (b) alert() (c) for (d) if
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) name (d) Arjun
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) name (d) Riya
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 86 (c) 14
21. 21.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
22. 22.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) Hello, name! (d) name
23. 23.⚡ Which JavaScript word makes a new variable? (a) let (b) if (c) for (d) alert()
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 96 (b) 15 (c) Error
26. 26.⚡ What number does this code print?
    let a = 5;
    let b = 10;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let a = 4;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 3;
    marks = marks - 5;
    console.log(marks);
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) Hello, Zoya! (d) name
30. 30.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 6 (b) Error (c) 15
34. 34.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 19;
    apples = apples - 28;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 51;
    let b = 4;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let a = 32;
    let b = 17;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 23;
    let b = 25;
    console.log(a + b);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 11 (b) Error (c) 65
39. 39.⚡ What number does this code print?
    let score = 12;
    score = score + 5;
    score = score - 10;
    console.log(score);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) Meera (d) name

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