JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 3 · 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.⚡ Where does console.log() show its output? (a) on the printer (b) in the console (c) in the address bar (d) on the title bar
2. 2.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
3. 3.⚡ What number does this code print?
   let runs = 23;
   runs = runs + 3;
   runs = runs - 24;
   console.log(runs);
4. 4.⚡ What number does this code print?
   let a = 18;
   let b = 19;
   console.log(a + b);
5. 5.⚡ What number does this code print?
   let a = 21;
   let b = 9;
   console.log(a - b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 8;
   console.log(x + y); (a) Error (b) 98 (c) 17
7. 7.⚡ What number does this code print?
   let a = 12;
   let b = 6;
   console.log(a + b);
8. 8.⚡ What number does this code print?
   let a = 27;
   let b = 22;
   console.log(a + b);
9. 9.⚡ What number does this code print?
   let a = 49;
   let b = 15;
   console.log(a - b);
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 86 (b) Error (c) 14
11. 11.⚡ What number does this code print?
    let a = 48;
    let b = 23;
    console.log(a + b);
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) if
13. 13.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
15. 15.⚡ What number does this code print?
    let a = 29;
    let b = 15;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let score = 25;
    score = score + 3;
    score = score - 13;
    console.log(score);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 51 (b) 6 (c) Error
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 1;
    console.log(x + y); (a) 3 (b) 21 (c) Error
19. 19.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 16;
    runs = runs - 8;
    console.log(runs);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Zoya (d) Well done, Zoya!
21. 21.⚡ What number does this code print?
    let a = 10;
    let b = 5;
    console.log(a * b);
22. 22.⚡ Which JavaScript word repeats code? (a) for (b) alert() (c) if (d) console.log()
23. 23.⚡ What number does this code print?
    let a = 6;
    let b = 32;
    console.log(a + b);
24. 24.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Aman! (c) Aman (d) name
25. 25.⚡ What number does this code print?
    let coins = 6;
    coins = coins + 3;
    coins = coins - 5;
    console.log(coins);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 7 (c) 61
27. 27.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) console.log() (d) if
28. 28.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) name (c) Hi, Arjun! (d) Arjun
30. 30.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let a = 25;
    let b = 7;
    console.log(a + b);
33. 33.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Welcome, name! (d) Kabir
34. 34.⚡ What number does this code print?
    let a = 22;
    let b = 22;
    console.log(a + b);
35. 35.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
36. 36.⚡ What does this code show?
    let name = "Meera";
    console.log("Hi, " + name + "!"); (a) Meera (b) name (c) Hi, Meera! (d) Hi, name!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) Error (b) 53 (c) 8
38. 38.⚡ What number does this code print?
    let a = 27;
    let b = 14;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) Well done, name! (d) name
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 10;
    console.log(a * b);

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