JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 761 · 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 score = 25;
   score = score + 12;
   score = score - 26;
   console.log(score);
2. 2.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) if (d) alert()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) Error (b) 16 (c) 7
4. 4.⚡ What number does this code print?
   let a = 5;
   let b = 17;
   console.log(a + b);
5. 5.⚡ Which JavaScript word runs code when true? (a) for (b) alert() (c) let (d) if
6. 6.⚡ What number does this code print?
   let a = 46;
   let b = 22;
   console.log(a + b);
7. 7.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) alert()
8. 8.⚡ What number does this code print?
   let score = 16;
   score = score + 12;
   score = score - 2;
   console.log(score);
9. 9.⚡ What number does this code print?
   let a = 13;
   let b = 16;
   console.log(a + b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) 61 (b) Error (c) 7
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 5;
    console.log(x + y); (a) 8 (b) Error (c) 35
12. 12.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) name (c) Welcome, name! (d) Zoya
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) let (d) for
15. 15.⚡ What number does this code print?
    let a = 32;
    let b = 36;
    console.log(a + b);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
17. 17.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) name (d) Kabir
18. 18.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
20. 20.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) Aman (d) name
21. 21.⚡ What number does this code print?
    let a = 58;
    let b = 11;
    console.log(a - b);
22. 22.⚡ What number does this code print?
    let a = 14;
    let b = 3;
    console.log(a - b);
23. 23.⚡ What number does this code print?
    let a = 57;
    let b = 28;
    console.log(a + b);
24. 24.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) the domain name (d) actions and changes
25. 25.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 2;
    coins = coins - 7;
    console.log(coins);
26. 26.⚡ What number does this code print?
    let a = 11;
    let b = 27;
    console.log(a + b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 9;
    console.log(x + y); (a) 39 (b) 12 (c) Error
29. 29.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a new tab (d) a table
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 4;
    console.log(x + y); (a) Error (b) 94 (c) 13
31. 31.⚡ What number does this code print?
    let a = 34;
    let b = 12;
    console.log(a - b);
32. 32.⚡ What number does this code print?
    let a = 31;
    let b = 5;
    console.log(a - b);
33. 33.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
34. 34.⚡ What number does this code print?
    let a = 12;
    let b = 34;
    console.log(a + b);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) 63 (c) Error
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 16;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Hi, name! (d) Kabir
38. 38.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
39. 39.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 16;
    apples = apples - 25;
    console.log(apples);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) name (d) Welcome, Zoya!

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