JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 502 · 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 = "5";
   let y = 9;
   console.log(x + y); (a) 59 (b) Error (c) 14
2. 2.⚡ What number does this code print?
   let marks = 17;
   marks = marks + 2;
   marks = marks - 11;
   console.log(marks);
3. 3.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) alert() (d) if
5. 5.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
7. 7.⚡ What number does this code print?
   let a = 22;
   let b = 35;
   console.log(a + b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 9;
   console.log(x + y); (a) Error (b) 10 (c) 19
9. 9.⚡ What number does this code print?
   let a = 5;
   let b = 4;
   console.log(a * b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) Error (b) 37 (c) 10
11. 11.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
12. 12.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 14;
    marks = marks - 16;
    console.log(marks);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
14. 14.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Well done, Arjun! (b) Well done, name! (c) Arjun (d) name
15. 15.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, Riya! (c) name (d) Welcome, name!
16. 16.⚡ Which word makes a new variable? (a) make (b) let (c) put (d) give
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
18. 18.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 4;
    apples = apples - 2;
    console.log(apples);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) Error (c) 97
20. 20.⚡ What number does this code print?
    let a = 55;
    let b = 32;
    console.log(a + b);
21. 21.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) let (d) if
22. 22.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
23. 23.⚡ What number does this code print?
    let a = 2;
    let b = 12;
    console.log(a * b);
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Meera (c) Hi, Meera! (d) name
26. 26.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 4;
    runs = runs - 11;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let a = 24;
    let b = 25;
    console.log(a + b);
28. 28.⚡ 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
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 87 (b) Error (c) 15
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) 66 (c) Error
31. 31.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 39 (c) 12
34. 34.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, Kabir! (d) Hi, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) 6 (b) Error (c) 42
36. 36.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, Meera! (b) name (c) Hi, name! (d) Meera
37. 37.⚡ What number does this code print?
    let a = 39;
    let b = 30;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 56;
    let b = 39;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let score = 7;
    score = score + 16;
    score = score - 13;
    console.log(score);
40. 40.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for

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