JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 190 · 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 = "3";
   let y = 9;
   console.log(x + y); (a) 12 (b) Error (c) 39
2. 2.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) Error (b) 8 (c) 35
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 89 (b) 17 (c) Error
5. 5.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <script> (d) <style>
6. 6.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
7. 7.⚡ What does this code show?
   let name = "Zoya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) name (d) Well done, Zoya!
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) for (b) let (c) alert() (d) console.log()
9. 9.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) console.log() (d) for
10. 10.⚡ What number does this code print?
    let a = 49;
    let b = 28;
    console.log(a + b);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Zoya (c) name (d) Well done, name!
12. 12.⚡ Which JavaScript word repeats code? (a) console.log() (b) if (c) let (d) for
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
14. 14.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 7;
    coins = coins - 1;
    console.log(coins);
15. 15.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) if (d) console.log()
16. 16.⚡ What number does this code print?
    let a = 53;
    let b = 25;
    console.log(a + b);
17. 17.⚡ What number does this code print?
    let a = 22;
    let b = 7;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let score = 14;
    score = score + 2;
    score = score - 7;
    console.log(score);
19. 19.⚡ What number does this code print?
    let a = 46;
    let b = 6;
    console.log(a + b);
20. 20.⚡ Which JavaScript word writes in the console? (a) console.log() (b) if (c) alert() (d) let
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 2;
    console.log(x + y); (a) 8 (b) 62 (c) Error
22. 22.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 7;
    coins = coins - 15;
    console.log(coins);
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Welcome, Riya! (d) Riya
24. 24.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 10;
    runs = runs - 11;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let score = 22;
    score = score + 20;
    score = score - 9;
    console.log(score);
26. 26.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
27. 27.⚡ What number does this code print?
    let a = 26;
    let b = 9;
    console.log(a + b);
28. 28.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
30. 30.⚡ Which word makes a new variable? (a) let (b) make (c) put (d) give
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 8;
    console.log(x + y); (a) 10 (b) 28 (c) Error
32. 32.⚡ 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
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 88 (c) 16
34. 34.⚡ What number does this code print?
    let a = 39;
    let b = 26;
    console.log(a + b);
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Kabir (d) Well done, Kabir!
36. 36.⚡ What number does this code print?
    let a = 3;
    let b = 3;
    console.log(a * b);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
38. 38.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 7;
    runs = runs - 2;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let runs = 6;
    runs = runs + 10;
    runs = runs - 10;
    console.log(runs);
40. 40.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 3;
    marks = marks - 30;
    console.log(marks);

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