JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 118 · 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 shows a pop-up box? (a) alert() (b) for (c) let (d) if
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 2;
   console.log(x + y); (a) 10 (b) Error (c) 82
3. 3.⚡ What number does this code print?
   let a = 28;
   let b = 2;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let apples = 15;
   apples = apples + 11;
   apples = apples - 10;
   console.log(apples);
5. 5.⚡ What number does this code print?
   let runs = 24;
   runs = runs + 16;
   runs = runs - 32;
   console.log(runs);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 9;
   console.log(x + y); (a) 89 (b) 17 (c) Error
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Riya (c) Hello, Riya! (d) name
8. 8.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) if (d) for
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, Riya! (c) Riya (d) Well done, name!
11. 11.⚡ Which word makes a new variable? (a) put (b) let (c) make (d) give
12. 12.⚡ What number does this code print?
    let a = 20;
    let b = 22;
    console.log(a + b);
13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, Meera! (b) name (c) Well done, name! (d) Meera
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 7;
    console.log(x + y); (a) 57 (b) 12 (c) Error
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, name! (c) name (d) Hi, Arjun!
16. 16.⚡ What number does this code print?
    let a = 41;
    let b = 36;
    console.log(a - b);
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
18. 18.⚡ What number does this code print?
    let a = 16;
    let b = 23;
    console.log(a + b);
19. 19.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
20. 20.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) if (d) console.log()
21. 21.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a picture (d) a new tab
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) 13 (b) Error (c) 76
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
24. 24.⚡ What number does this code print?
    let a = 6;
    let b = 15;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let apples = 26;
    apples = apples + 6;
    apples = apples - 9;
    console.log(apples);
26. 26.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
27. 27.⚡ What number does this code print?
    let score = 8;
    score = score + 8;
    score = score - 5;
    console.log(score);
28. 28.⚡ What number does this code print?
    let a = 38;
    let b = 1;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 11;
    let b = 12;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 30;
    let b = 18;
    console.log(a + b);
31. 31.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
32. 32.⚡ What number does this code print?
    let score = 12;
    score = score + 7;
    score = score - 15;
    console.log(score);
33. 33.⚡ What number does this code print?
    let score = 16;
    score = score + 12;
    score = score - 6;
    console.log(score);
34. 34.⚡ What number does this code print?
    let score = 26;
    score = score + 17;
    score = score - 18;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) Error (b) 18 (c) 9
36. 36.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
37. 37.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 12;
    marks = marks - 10;
    console.log(marks);
38. 38.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Hello, name! (d) Kabir
39. 39.⚡ What number does this code print?
    let score = 6;
    score = score + 9;
    score = score - 5;
    console.log(score);
40. 40.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) for

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