JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 840 · 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 apples = 11;
   apples = apples + 17;
   apples = apples - 10;
   console.log(apples);
2. 2.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 2;
   apples = apples - 8;
   console.log(apples);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 3;
   console.log(x + y); (a) Error (b) 43 (c) 7
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Hi, name! (d) Arjun
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .jpg (d) .js
6. 6.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a new tab (d) a table
7. 7.⚡ What number does this code print?
   let score = 9;
   score = score + 16;
   score = score - 6;
   console.log(score);
8. 8.⚡ What does this code show?
   let name = "Arjun";
   alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
9. 9.⚡ Which JavaScript word writes in the console? (a) let (b) console.log() (c) if (d) alert()
10. 10.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 9;
    coins = coins - 1;
    console.log(coins);
11. 11.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) for (d) let
12. 12.⚡ Which word makes a new variable? (a) make (b) put (c) give (d) let
13. 13.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
14. 14.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
16. 16.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) let (d) if
17. 17.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Riya! (c) Riya (d) Hello, name!
18. 18.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
19. 19.⚡ What number does this code print?
    let a = 55;
    let b = 13;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 17;
    runs = runs - 45;
    console.log(runs);
21. 21.⚡ What number does this code print?
    let a = 20;
    let b = 10;
    console.log(a - b);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) name (c) Welcome, name! (d) Arjun
23. 23.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
24. 24.⚡ What number does this code print?
    let score = 26;
    score = score + 8;
    score = score - 26;
    console.log(score);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 21 (b) Error (c) 3
26. 26.⚡ What number does this code print?
    let a = 34;
    let b = 6;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 8;
    console.log(x + y); (a) 12 (b) 48 (c) Error
28. 28.⚡ What number does this code print?
    let runs = 30;
    runs = runs + 8;
    runs = runs - 9;
    console.log(runs);
29. 29.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Hi, name! (c) name (d) Kabir
30. 30.⚡ What number does this code print?
    let runs = 14;
    runs = runs + 9;
    runs = runs - 7;
    console.log(runs);
31. 31.⚡ 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
32. 32.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Welcome, name! (d) Meera
33. 33.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 4;
    runs = runs - 11;
    console.log(runs);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
35. 35.⚡ What number does this code print?
    let a = 47;
    let b = 25;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 8;
    runs = runs - 20;
    console.log(runs);
37. 37.⚡ What does JavaScript add to a web page? (a) only colours (b) the page title (c) actions and changes (d) the domain name
38. 38.⚡ What number does this code print?
    let a = 37;
    let b = 35;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 43;
    let b = 22;
    console.log(a - b);
40. 40.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) name (c) Hello, name! (d) Hello, Riya!

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