JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 827 · 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 runs = 9;
   runs = runs + 5;
   runs = runs - 1;
   console.log(runs);
2. 2.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
3. 3.⚡ What number does this code print?
   let apples = 8;
   apples = apples + 10;
   apples = apples - 9;
   console.log(apples);
4. 4.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 3;
   runs = runs - 5;
   console.log(runs);
5. 5.⚡ What number does this code print?
   let apples = 19;
   apples = apples + 19;
   apples = apples - 13;
   console.log(apples);
6. 6.⚡ What number does this code print?
   let runs = 18;
   runs = runs + 7;
   runs = runs - 22;
   console.log(runs);
7. 7.⚡ What number does this code print?
   let score = 12;
   score = score + 7;
   score = score - 3;
   console.log(score);
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) name (d) Hello, Riya!
9. 9.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) let (d) alert()
10. 10.⚡ 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
11. 11.⚡ What number does this code print?
    let score = 11;
    score = score + 20;
    score = score - 1;
    console.log(score);
12. 12.⚡ Which JavaScript word runs code when true? (a) let (b) if (c) alert() (d) console.log()
13. 13.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
14. 14.⚡ Where does console.log() show its output? (a) in the console (b) on the printer (c) in the address bar (d) on the title bar
15. 15.⚡ What number does this code print?
    let a = 15;
    let b = 24;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 12;
    runs = runs - 5;
    console.log(runs);
17. 17.⚡ Which JavaScript word shows a pop-up box? (a) let (b) if (c) for (d) alert()
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, name! (d) Welcome, Arjun!
19. 19.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Hi, name! (d) Arjun
21. 21.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
22. 22.⚡ What number does this code print?
    let a = 58;
    let b = 15;
    console.log(a + b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) Error (b) 15 (c) 87
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 7;
    console.log(x + y); (a) Error (b) 11 (c) 47
27. 27.⚡ What number does this code print?
    let a = 9;
    let b = 1;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let a = 54;
    let b = 36;
    console.log(a + b);
29. 29.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) console.log()
30. 30.⚡ What number does this code print?
    let marks = 13;
    marks = marks + 8;
    marks = marks - 18;
    console.log(marks);
31. 31.⚡ What number does this code print?
    let a = 19;
    let b = 5;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
33. 33.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
34. 34.⚡ Which JavaScript word writes in the console? (a) console.log() (b) alert() (c) if (d) let
35. 35.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 7;
    apples = apples - 25;
    console.log(apples);
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) name (d) Hello, Kabir!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) Error (b) 12 (c) 39
38. 38.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Aman! (d) Aman
39. 39.⚡ 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
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) 7 (c) Error

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