JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 77 · 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 a = 56;
   let b = 12;
   console.log(a - b);
2. 2.⚡ What number does this code print?
   let a = 23;
   let b = 34;
   console.log(a + b);
3. 3.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
4. 4.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
5. 5.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .html (d) .jpg
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, name! (c) Welcome, Zoya! (d) name
7. 7.⚡ What number does this code print?
   let runs = 5;
   runs = runs + 3;
   runs = runs - 4;
   console.log(runs);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) 64 (c) Error
9. 9.⚡ What number does this code print?
   let a = 4;
   let b = 7;
   console.log(a * b);
10. 10.⚡ What does JavaScript add to a web page? (a) only colours (b) the domain name (c) actions and changes (d) the page title
11. 11.⚡ Where does console.log() show its output? (a) in the address bar (b) in the console (c) on the printer (d) on the title bar
12. 12.⚡ What number does this code print?
    let score = 15;
    score = score + 9;
    score = score - 3;
    console.log(score);
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 31 (b) 4 (c) Error
14. 14.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) for
15. 15.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) for (c) let (d) if
16. 16.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 2;
    coins = coins - 1;
    console.log(coins);
17. 17.⚡ What number does this code print?
    let a = 12;
    let b = 2;
    console.log(a * b);
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) if
19. 19.⚡ 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
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 76 (c) 13
22. 22.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) let
23. 23.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <js> (d) <code>
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) Error (c) 11
25. 25.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) for (d) if
26. 26.⚡ What number does this code print?
    let a = 45;
    let b = 23;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
28. 28.⚡ What number does this code print?
    let a = 49;
    let b = 8;
    console.log(a + b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) Error (b) 86 (c) 14
30. 30.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Riya! (c) name (d) Riya
31. 31.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 7 (b) Error (c) 34
33. 33.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
34. 34.⚡ What number does this code print?
    let a = 9;
    let b = 4;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 13;
    runs = runs - 19;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let a = 33;
    let b = 21;
    console.log(a - b);
37. 37.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 2;
    marks = marks - 27;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 10;
    let b = 14;
    console.log(a + b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) Welcome, name! (c) name (d) Meera
40. 40.⚡ What number does this code print?
    let a = 58;
    let b = 14;
    console.log(a - b);

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