JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 95 · 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 alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
2. 2.⚡ Which word makes a new variable? (a) put (b) give (c) let (d) make
3. 3.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
4. 4.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) let (d) console.log()
5. 5.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
6. 6.⚡ What number does this code print?
   let apples = 28;
   apples = apples + 16;
   apples = apples - 18;
   console.log(apples);
7. 7.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
8. 8.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
9. 9.⚡ What does this code show?
   let name = "Aman";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
10. 10.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
11. 11.⚡ What number does this code print?
    let a = 47;
    let b = 2;
    console.log(a - b);
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
13. 13.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
15. 15.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 12;
    apples = apples - 31;
    console.log(apples);
16. 16.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, Zoya! (b) name (c) Zoya (d) Hello, name!
17. 17.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) let (d) for
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 9;
    console.log(x + y); (a) 79 (b) Error (c) 16
19. 19.⚡ What number does this code print?
    let a = 48;
    let b = 11;
    console.log(a - b);
20. 20.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
21. 21.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) 16 (c) Error
23. 23.⚡ What number does this code print?
    let a = 32;
    let b = 9;
    console.log(a + b);
24. 24.⚡ What number does this code print?
    let score = 17;
    score = score + 4;
    score = score - 21;
    console.log(score);
25. 25.⚡ What number does this code print?
    let runs = 25;
    runs = runs + 4;
    runs = runs - 22;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let runs = 24;
    runs = runs + 13;
    runs = runs - 6;
    console.log(runs);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) Error (c) 11
29. 29.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, name! (d) Well done, Zoya!
30. 30.⚡ What number does this code print?
    let a = 38;
    let b = 24;
    console.log(a - b);
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) name (d) Hi, Kabir!
32. 32.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) name (d) Welcome, name!
33. 33.⚡ What number does this code print?
    let a = 12;
    let b = 9;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 17;
    coins = coins - 3;
    console.log(coins);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
36. 36.⚡ What number does this code print?
    let a = 54;
    let b = 3;
    console.log(a + b);
37. 37.⚡ What number does this code print?
    let a = 33;
    let b = 26;
    console.log(a - b);
38. 38.⚡ What number does this code print?
    let a = 52;
    let b = 20;
    console.log(a + b);
39. 39.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
40. 40.⚡ What number does this code print?
    let score = 11;
    score = score + 2;
    score = score - 2;
    console.log(score);

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