JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 166 · 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 number does this code print?
   let a = 57;
   let b = 3;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let coins = 5;
   coins = coins + 5;
   coins = coins - 7;
   console.log(coins);
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) let (d) alert()
4. 4.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) alert() (d) let
5. 5.⚡ What number does this code print?
   let a = 30;
   let b = 33;
   console.log(a + b);
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Welcome, " + name + "!"); (a) name (b) Riya (c) Welcome, Riya! (d) Welcome, name!
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 1;
   console.log(x + y); (a) Error (b) 71 (c) 8
9. 9.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) console.log() (d) alert()
10. 10.⚡ What number does this code print?
    let marks = 12;
    marks = marks + 12;
    marks = marks - 4;
    console.log(marks);
11. 11.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) name (d) Well done, Riya!
13. 13.⚡ 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
14. 14.⚡ What number does this code print?
    let a = 41;
    let b = 33;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 12;
    runs = runs - 19;
    console.log(runs);
16. 16.⚡ What number does this code print?
    let a = 15;
    let b = 10;
    console.log(a + b);
17. 17.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
18. 18.⚡ What number does this code print?
    let a = 36;
    let b = 21;
    console.log(a + b);
19. 19.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, Zoya! (c) Zoya (d) Well done, name!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
21. 21.⚡ What number does this code print?
    let a = 55;
    let b = 10;
    console.log(a + b);
22. 22.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
24. 24.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 4;
    runs = runs - 2;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let a = 17;
    let b = 6;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, name! (d) Welcome, Kabir!
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 9;
    console.log(a * b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) Error (b) 3 (c) 21
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 2;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 40;
    let b = 9;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 5 (c) 32
32. 32.⚡ What number does this code print?
    let books = 8;
    books = books + 17;
    books = books - 8;
    console.log(books);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
34. 34.⚡ What number does this code print?
    let score = 26;
    score = score + 6;
    score = score - 26;
    console.log(score);
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, name! (d) Hi, Arjun!
36. 36.⚡ 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
37. 37.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
38. 38.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Zoya! (d) Zoya
39. 39.⚡ What number does this code print?
    let a = 32;
    let b = 30;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, name! (c) Welcome, Meera! (d) name

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