JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 366 · 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.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .jpg (c) .html (d) .css
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Kabir (c) name (d) Welcome, Kabir!
3. 3.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
5. 5.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) for (d) alert()
6. 6.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Hi, name! (d) Aman
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Meera (d) Hello, name!
8. 8.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) alert() (d) if
9. 9.⚡ What number does this code print?
   let marks = 28;
   marks = marks + 20;
   marks = marks - 22;
   console.log(marks);
10. 10.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
12. 12.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
13. 13.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) in the console (d) on the title bar
14. 14.⚡ What number does this code print?
    let a = 5;
    let b = 7;
    console.log(a * b);
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
16. 16.⚡ What number does this code print?
    let a = 35;
    let b = 1;
    console.log(a - b);
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) Hi, name! (c) name (d) Riya
18. 18.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 15;
    apples = apples - 2;
    console.log(apples);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 51 (c) 6
20. 20.⚡ What number does this code print?
    let a = 59;
    let b = 37;
    console.log(a - b);
21. 21.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 8;
    runs = runs - 21;
    console.log(runs);
22. 22.⚡ What does alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
23. 23.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 20;
    apples = apples - 27;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let a = 56;
    let b = 16;
    console.log(a - b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) 86 (c) Error
26. 26.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 9;
    marks = marks - 11;
    console.log(marks);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 2 (b) 11 (c) Error
28. 28.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, Arjun! (c) name (d) Welcome, name!
29. 29.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) let (d) for
30. 30.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) alert() (d) let
31. 31.⚡ What number does this code print?
    let apples = 21;
    apples = apples + 18;
    apples = apples - 33;
    console.log(apples);
32. 32.⚡ What number does this code print?
    let a = 32;
    let b = 18;
    console.log(a - b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) Error (c) 56
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) Error (c) 3
35. 35.⚡ What number does this code print?
    let a = 44;
    let b = 30;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 19;
    marks = marks - 12;
    console.log(marks);
37. 37.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) name (c) Aman (d) Well done, name!
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) name (c) Aman (d) Hi, name!
39. 39.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 12;
    coins = coins - 5;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let a = 5;
    let b = 6;
    console.log(a * b);

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