JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 42 · 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 JavaScript word writes in the console? (a) alert() (b) for (c) if (d) console.log()
2. 2.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
3. 3.⚡ What number does this code print?
   let a = 43;
   let b = 13;
   console.log(a + b);
4. 4.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
5. 5.⚡ What number does this code print?
   let a = 7;
   let b = 3;
   console.log(a * b);
6. 6.⚡ What number does this code print?
   let a = 50;
   let b = 11;
   console.log(a + b);
7. 7.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) let
8. 8.⚡ What number does this code print?
   let score = 27;
   score = score + 6;
   score = score - 28;
   console.log(score);
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
10. 10.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) if (d) let
11. 11.⚡ What number does this code print?
    let a = 13;
    let b = 8;
    console.log(a - b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) 16 (c) Error
13. 13.⚡ What number does this code print?
    let a = 36;
    let b = 17;
    console.log(a - b);
14. 14.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
15. 15.⚡ What number does this code print?
    let a = 7;
    let b = 7;
    console.log(a * b);
16. 16.⚡ What does alert() show? (a) a pop-up box (b) a table (c) a picture (d) a new tab
17. 17.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
18. 18.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Hello, Zoya! (d) Zoya
19. 19.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 13;
    runs = runs - 20;
    console.log(runs);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) 9 (c) Error
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 3;
    console.log(x + y); (a) 83 (b) 11 (c) Error
22. 22.⚡ What number does this code print?
    let a = 45;
    let b = 32;
    console.log(a - b);
23. 23.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
24. 24.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
25. 25.⚡ What does this code show?
    let name = "Riya";
    alert("Well done, " + name + "!"); (a) Riya (b) name (c) Well done, name! (d) Well done, Riya!
26. 26.⚡ 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
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 10 (b) 19 (c) Error
28. 28.⚡ What does this code show?
    let name = "Kabir";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Kabir! (c) name (d) Kabir
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) 10 (b) Error (c) 91
30. 30.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 19;
    apples = apples - 14;
    console.log(apples);
31. 31.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 11;
    coins = coins - 1;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 16;
    runs = runs - 17;
    console.log(runs);
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 marks = 6;
    marks = marks + 5;
    marks = marks - 3;
    console.log(marks);
35. 35.⚡ What number does this code print?
    let marks = 14;
    marks = marks + 16;
    marks = marks - 10;
    console.log(marks);
36. 36.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
37. 37.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
38. 38.⚡ What number does this code print?
    let a = 17;
    let b = 18;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let score = 21;
    score = score + 10;
    score = score - 13;
    console.log(score);
40. 40.⚡ What number does this code print?
    let a = 29;
    let b = 3;
    console.log(a + b);

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