JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 895 · 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 show?
   let name = "Aman";
   alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Arjun (d) Welcome, Arjun!
3. 3.⚡ What number does this code print?
   let a = 47;
   let b = 9;
   console.log(a - b);
4. 4.⚡ 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
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 4;
   console.log(x + y); (a) Error (b) 94 (c) 13
6. 6.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Meera (b) name (c) Welcome, name! (d) Welcome, Meera!
7. 7.⚡ What number does this code print?
   let a = 31;
   let b = 29;
   console.log(a - b);
8. 8.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 7;
   coins = coins - 2;
   console.log(coins);
9. 9.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 12 (b) Error (c) 3
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) console.log()
12. 12.⚡ What number does this code print?
    let a = 32;
    let b = 4;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 35;
    let b = 17;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 5;
    coins = coins - 21;
    console.log(coins);
15. 15.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
16. 16.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 1;
    console.log(x + y); (a) 81 (b) Error (c) 9
18. 18.⚡ Which JavaScript word makes a new variable? (a) alert() (b) console.log() (c) let (d) if
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 12;
    console.log(a * b);
20. 20.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
21. 21.⚡ What does alert() show? (a) a picture (b) a table (c) a pop-up box (d) a new tab
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) Error (b) 14 (c) 95
23. 23.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
24. 24.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .js (c) .jpg (d) .html
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 1;
    console.log(x + y); (a) Error (b) 10 (c) 91
26. 26.⚡ What number does this code print?
    let marks = 10;
    marks = marks + 7;
    marks = marks - 13;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let a = 11;
    let b = 3;
    console.log(a * b);
28. 28.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
29. 29.⚡ What number does this code print?
    let a = 43;
    let b = 4;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let score = 25;
    score = score + 13;
    score = score - 17;
    console.log(score);
31. 31.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 14;
    coins = coins - 18;
    console.log(coins);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 17 (b) 98 (c) Error
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Kabir (b) name (c) Hi, name! (d) Hi, Kabir!
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) Aman (c) name (d) Well done, Aman!
35. 35.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Aman! (d) Aman
36. 36.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) for (d) console.log()
37. 37.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
38. 38.⚡ What number does this code print?
    let runs = 11;
    runs = runs + 13;
    runs = runs - 5;
    console.log(runs);
39. 39.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
40. 40.⚡ What number does this code print?
    let marks = 15;
    marks = marks + 18;
    marks = marks - 11;
    console.log(marks);

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