JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 985 · 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 runs code when true? (a) if (b) let (c) for (d) console.log()
2. 2.⚡ What number does this code print?
   let coins = 19;
   coins = coins + 19;
   coins = coins - 24;
   console.log(coins);
3. 3.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
4. 4.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
5. 5.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Arjun (d) Hello, Arjun!
6. 6.⚡ What number does this code print?
   let a = 32;
   let b = 7;
   console.log(a - b);
7. 7.⚡ Which JavaScript word makes a new variable? (a) for (b) if (c) console.log() (d) let
8. 8.⚡ What number does this code print?
   let marks = 15;
   marks = marks + 15;
   marks = marks - 8;
   console.log(marks);
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) Error (b) 91 (c) 10
10. 10.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) if (d) let
11. 11.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 10;
    apples = apples - 17;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let a = 43;
    let b = 18;
    console.log(a - b);
13. 13.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) 82 (b) Error (c) 10
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 9 (b) 36 (c) Error
17. 17.⚡ What number does this code print?
    let a = 8;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 30;
    let b = 26;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Aman (d) Well done, Aman!
20. 20.⚡ Which word makes a new variable? (a) make (b) give (c) put (d) let
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
22. 22.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Riya! (d) Riya
24. 24.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
25. 25.⚡ What number does this code print?
    let coins = 24;
    coins = coins + 11;
    coins = coins - 17;
    console.log(coins);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
28. 28.⚡ What number does this code print?
    let a = 35;
    let b = 21;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 6;
    marks = marks - 16;
    console.log(marks);
30. 30.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
31. 31.⚡ What number does this code print?
    let a = 2;
    let b = 7;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 16;
    apples = apples - 4;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 18;
    marks = marks - 6;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let marks = 21;
    marks = marks + 9;
    marks = marks - 2;
    console.log(marks);
36. 36.⚡ What number does this code print?
    let score = 28;
    score = score + 18;
    score = score - 25;
    console.log(score);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) Kabir (c) Well done, name! (d) name
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 7;
    console.log(x + y); (a) 15 (b) Error (c) 87
39. 39.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) name (c) Hi, name! (d) Hi, Zoya!
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Zoya (c) Well done, Zoya! (d) Well done, name!

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