JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 617 · 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) let (b) if (c) alert() (d) console.log()
2. 2.⚡ Which JavaScript word repeats code? (a) if (b) for (c) console.log() (d) let
3. 3.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
4. 4.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
5. 5.⚡ What does this code show?
   let name = "Kabir";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
6. 6.⚡ What number does this code print?
   let a = 50;
   let b = 33;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let coins = 11;
   coins = coins + 13;
   coins = coins - 14;
   console.log(coins);
8. 8.⚡ What number does this code print?
   let a = 43;
   let b = 37;
   console.log(a - b);
9. 9.⚡ What number does this code print?
   let score = 13;
   score = score + 4;
   score = score - 2;
   console.log(score);
10. 10.⚡ What number does this code print?
    let coins = 26;
    coins = coins + 8;
    coins = coins - 20;
    console.log(coins);
11. 11.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) Hello, Meera! (d) name
12. 12.⚡ What number does this code print?
    let a = 42;
    let b = 5;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let a = 44;
    let b = 32;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let score = 15;
    score = score + 13;
    score = score - 13;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 31;
    let b = 24;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let runs = 17;
    runs = runs + 5;
    runs = runs - 16;
    console.log(runs);
17. 17.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) alert()
18. 18.⚡ What number does this code print?
    let a = 18;
    let b = 1;
    console.log(a - b);
19. 19.⚡ What number does this code print?
    let a = 11;
    let b = 7;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let a = 17;
    let b = 5;
    console.log(a - b);
21. 21.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) Error (c) 16
23. 23.⚡ What number does this code print?
    let a = 50;
    let b = 19;
    console.log(a - b);
24. 24.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 8;
    marks = marks - 11;
    console.log(marks);
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 9;
    console.log(x + y); (a) Error (b) 89 (c) 17
26. 26.⚡ 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
27. 27.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 8;
    coins = coins - 20;
    console.log(coins);
28. 28.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
29. 29.⚡ 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
30. 30.⚡ What number does this code print?
    let a = 17;
    let b = 17;
    console.log(a - b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
32. 32.⚡ Which JavaScript word shows a pop-up box? (a) let (b) console.log() (c) for (d) alert()
33. 33.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .js (c) .css (d) .jpg
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 43 (c) 7
35. 35.⚡ What number does this code print?
    let a = 3;
    let b = 6;
    console.log(a * b);
36. 36.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
37. 37.⚡ What number does this code print?
    let a = 24;
    let b = 37;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 17;
    runs = runs - 5;
    console.log(runs);
39. 39.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, name! (c) name (d) Hello, Aman!
40. 40.⚡ What number does this code print?
    let a = 49;
    let b = 24;
    console.log(a - b);

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