JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 786 · 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 show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
2. 2.⚡ What number does this code print?
   let coins = 17;
   coins = coins + 14;
   coins = coins - 2;
   console.log(coins);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 5;
   console.log(x + y); (a) 85 (b) 13 (c) Error
4. 4.⚡ What number does this code print?
   let a = 6;
   let b = 4;
   console.log(a * b);
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
6. 6.⚡ 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
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) let
8. 8.⚡ What number does this code print?
   let a = 18;
   let b = 5;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let a = 60;
   let b = 38;
   console.log(a + b);
10. 10.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
11. 11.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Aman! (d) Aman
13. 13.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) Arjun (c) Hello, name! (d) name
14. 14.⚡ What number does this code print?
    let a = 30;
    let b = 11;
    console.log(a - b);
15. 15.⚡ What number does this code print?
    let a = 33;
    let b = 6;
    console.log(a - b);
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
17. 17.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
18. 18.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) alert() (d) let
19. 19.⚡ What number does this code print?
    let score = 5;
    score = score + 10;
    score = score - 10;
    console.log(score);
20. 20.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) let
21. 21.⚡ Which JavaScript word makes a new variable? (a) if (b) for (c) alert() (d) let
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, name! (c) Hello, Riya! (d) name
23. 23.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
24. 24.⚡ What number does this code print?
    let a = 15;
    let b = 2;
    console.log(a + b);
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
26. 26.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) name (b) Kabir (c) Welcome, Kabir! (d) Welcome, name!
28. 28.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
29. 29.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Riya! (c) Riya (d) name
30. 30.⚡ What number does this code print?
    let a = 6;
    let b = 24;
    console.log(a + b);
31. 31.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
32. 32.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (d) Welcome, name!
33. 33.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Zoya (d) Well done, name!
34. 34.⚡ What number does this code print?
    let a = 36;
    let b = 18;
    console.log(a - b);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 22;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let score = 24;
    score = score + 10;
    score = score - 28;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Arjun (b) Hello, Arjun! (c) name (d) Hello, name!
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
39. 39.⚡ What number does this code print?
    let a = 47;
    let b = 5;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!

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