JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 871 · 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.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
2. 2.⚡ What number does this code print?
   let coins = 28;
   coins = coins + 20;
   coins = coins - 21;
   console.log(coins);
3. 3.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
4. 4.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Arjun! (d) Arjun
6. 6.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, Aman! (d) Hi, name!
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) if (c) console.log() (d) for
9. 9.⚡ What number does this code print?
   let a = 5;
   let b = 5;
   console.log(a - b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
11. 11.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
12. 12.⚡ What number does this code print?
    let a = 60;
    let b = 6;
    console.log(a + b);
13. 13.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) 7 (b) Error (c) 43
15. 15.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .html (c) .jpg (d) .js
16. 16.⚡ Which JavaScript word writes in the console? (a) if (b) for (c) console.log() (d) alert()
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) Error (b) 11 (c) 2
18. 18.⚡ What does alert() show? (a) a new tab (b) a picture (c) a pop-up box (d) a table
19. 19.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 12;
    apples = apples - 7;
    console.log(apples);
20. 20.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
21. 21.⚡ What number does this code print?
    let score = 16;
    score = score + 5;
    score = score - 6;
    console.log(score);
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) name (c) Aman (d) Hello, name!
23. 23.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) if (d) let
24. 24.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
25. 25.⚡ What number does this code print?
    let a = 31;
    let b = 30;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let a = 44;
    let b = 27;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let score = 5;
    score = score + 9;
    score = score - 14;
    console.log(score);
28. 28.⚡ Which JavaScript word repeats code? (a) alert() (b) let (c) for (d) console.log()
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) Error (b) 81 (c) 9
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) 55 (c) Error
31. 31.⚡ What number does this code print?
    let a = 52;
    let b = 35;
    console.log(a - b);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) 3 (c) Error
33. 33.⚡ What number does this code print?
    let a = 41;
    let b = 11;
    console.log(a - b);
34. 34.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
36. 36.⚡ What number does this code print?
    let a = 22;
    let b = 19;
    console.log(a - b);
37. 37.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Well done, Riya! (b) name (c) Riya (d) Well done, name!
38. 38.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Arjun (c) Hi, Arjun! (d) Hi, name!
39. 39.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Kabir! (d) Kabir
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31

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