JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 964 · 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 makes a new variable? (a) if (b) let (c) for (d) alert()
2. 2.⚡ Which JavaScript word writes in the console? (a) alert() (b) let (c) for (d) console.log()
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 6;
   console.log(x + y); (a) 7 (b) 16 (c) Error
4. 4.⚡ Which word makes a new variable? (a) put (b) make (c) give (d) let
5. 5.⚡ What number does this code print?
   let a = 55;
   let b = 10;
   console.log(a - b);
6. 6.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 2;
   console.log(x + y); (a) Error (b) 8 (c) 62
7. 7.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <code> (c) <js> (d) <style>
8. 8.⚡ What does this code show?
   let name = "Kabir";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Well done, Kabir! (d) Kabir
9. 9.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
10. 10.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
11. 11.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Hi, Riya! (b) name (c) Hi, name! (d) Riya
12. 12.⚡ What number does this code print?
    let marks = 20;
    marks = marks + 3;
    marks = marks - 14;
    console.log(marks);
13. 13.⚡ What number does this code print?
    let score = 8;
    score = score + 2;
    score = score - 7;
    console.log(score);
14. 14.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
15. 15.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) Hello, name! (d) name
16. 16.⚡ What number does this code print?
    let a = 3;
    let b = 8;
    console.log(a * b);
17. 17.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let coins = 10;
    coins = coins + 5;
    coins = coins - 9;
    console.log(coins);
19. 19.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 20;
    runs = runs - 26;
    console.log(runs);
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
21. 21.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) for (d) if
22. 22.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 13;
    apples = apples - 35;
    console.log(apples);
23. 23.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .html (d) .js
24. 24.⚡ What number does this code print?
    let a = 38;
    let b = 36;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let marks = 30;
    marks = marks + 17;
    marks = marks - 9;
    console.log(marks);
26. 26.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Well done, Kabir! (c) Kabir (d) name
27. 27.⚡ 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
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 8;
    console.log(x + y); (a) 98 (b) 17 (c) Error
30. 30.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) alert() (d) for
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) Hi, name! (d) name
32. 32.⚡ Which JavaScript word repeats code? (a) if (b) alert() (c) for (d) console.log()
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) Error (b) 3 (c) 12
34. 34.⚡ What number does this code print?
    let runs = 10;
    runs = runs + 7;
    runs = runs - 6;
    console.log(runs);
35. 35.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Meera! (d) Meera
36. 36.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Riya (b) Welcome, name! (c) name (d) Welcome, Riya!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 9;
    console.log(x + y); (a) 15 (b) Error (c) 69
38. 38.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 7;
    apples = apples - 13;
    console.log(apples);
39. 39.⚡ What number does this code print?
    let a = 5;
    let b = 3;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!

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