JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 110 · 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 this code print? (Look at the quotes!)
   let x = "5";
   let y = 1;
   console.log(x + y); (a) 6 (b) 51 (c) Error
2. 2.⚡ What number does this code print?
   let a = 7;
   let b = 32;
   console.log(a + b);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 17 (b) 89 (c) Error
4. 4.⚡ What number does this code print?
   let a = 55;
   let b = 32;
   console.log(a - b);
5. 5.⚡ What number does this code print?
   let a = 4;
   let b = 2;
   console.log(a * b);
6. 6.⚡ Which JavaScript word writes in the console? (a) for (b) console.log() (c) alert() (d) let
7. 7.⚡ What number does this code print?
   let a = 9;
   let b = 8;
   console.log(a * b);
8. 8.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) on the printer (d) in the address bar
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 6;
   console.log(x + y); (a) 12 (b) Error (c) 66
10. 10.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 18;
    marks = marks - 31;
    console.log(marks);
11. 11.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) let
13. 13.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) Welcome, Kabir! (d) name
15. 15.⚡ What number does this code print?
    let a = 60;
    let b = 34;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 18 (b) Error (c) 9
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 7;
    console.log(x + y); (a) 27 (b) Error (c) 9
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 4;
    console.log(x + y); (a) 8 (b) Error (c) 44
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Meera! (c) name (d) Meera
21. 21.⚡ What number does this code print?
    let a = 31;
    let b = 27;
    console.log(a - b);
22. 22.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) if (d) let
23. 23.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <code> (c) <style> (d) <script>
24. 24.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 6;
    apples = apples - 3;
    console.log(apples);
25. 25.⚡ What number does this code print?
    let a = 47;
    let b = 20;
    console.log(a - b);
26. 26.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
27. 27.⚡ What number does this code print?
    let a = 57;
    let b = 25;
    console.log(a + b);
28. 28.⚡ Which JavaScript word repeats code? (a) alert() (b) if (c) console.log() (d) for
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
30. 30.⚡ What number does this code print?
    let a = 35;
    let b = 30;
    console.log(a - b);
31. 31.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
32. 32.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
33. 33.⚡ What number does this code print?
    let a = 45;
    let b = 4;
    console.log(a + b);
34. 34.⚡ What does alert() show? (a) a picture (b) a new tab (c) a table (d) a pop-up box
35. 35.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) Error (c) 75
37. 37.⚡ What number does this code print?
    let coins = 29;
    coins = coins + 5;
    coins = coins - 13;
    console.log(coins);
38. 38.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 2;
    runs = runs - 10;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, Aman! (b) Hi, name! (c) Aman (d) name
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya

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