JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 642 · 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) alert() (c) console.log() (d) if
2. 2.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
3. 3.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) name (b) Riya (c) Well done, Riya! (d) Well done, name!
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) alert() (c) console.log() (d) if
5. 5.⚡ Which JavaScript word repeats code? (a) for (b) console.log() (c) alert() (d) if
6. 6.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <code> (d) <style>
7. 7.⚡ What does this code show?
   let name = "Zoya";
   alert("Well done, " + name + "!"); (a) Well done, name! (b) Zoya (c) Well done, Zoya! (d) name
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Kabir (c) name (d) Hello, Kabir!
9. 9.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) only colours (d) the domain name
10. 10.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 2;
    console.log(x + y); (a) 3 (b) Error (c) 12
11. 11.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) let (d) if
12. 12.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Aman (c) name (d) Hello, Aman!
13. 13.⚡ What number does this code print?
    let a = 12;
    let b = 10;
    console.log(a * b);
14. 14.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) name (d) Hello, name!
15. 15.⚡ What number does this code print?
    let a = 41;
    let b = 20;
    console.log(a - b);
16. 16.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) alert()
17. 17.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 20;
    coins = coins - 9;
    console.log(coins);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 5;
    console.log(x + y); (a) 45 (b) 9 (c) Error
19. 19.⚡ What number does this code print?
    let a = 36;
    let b = 7;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let score = 23;
    score = score + 11;
    score = score - 8;
    console.log(score);
21. 21.⚡ What number does this code print?
    let score = 9;
    score = score + 17;
    score = score - 24;
    console.log(score);
22. 22.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
23. 23.⚡ What number does this code print?
    let a = 16;
    let b = 12;
    console.log(a + b);
24. 24.⚡ What does alert() show? (a) a table (b) a pop-up box (c) a new tab (d) a picture
25. 25.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a - b);
26. 26.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) in the console (d) on the printer
27. 27.⚡ What number does this code print?
    let books = 13;
    books = books + 20;
    books = books - 9;
    console.log(books);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 6;
    console.log(x + y); (a) Error (b) 76 (c) 13
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) 10 (b) Error (c) 55
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) Error (b) 14 (c) 59
31. 31.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) name (b) Aman (c) Well done, name! (d) Well done, Aman!
32. 32.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 15;
    runs = runs - 12;
    console.log(runs);
33. 33.⚡ What number does this code print?
    let a = 29;
    let b = 16;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let a = 5;
    let b = 37;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 42;
    let b = 19;
    console.log(a + b);
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 6;
    console.log(x + y); (a) 26 (b) 8 (c) Error
37. 37.⚡ What number does this code print?
    let score = 13;
    score = score + 5;
    score = score - 14;
    console.log(score);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 8;
    console.log(x + y); (a) 11 (b) Error (c) 38
39. 39.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 19;
    apples = apples - 11;
    console.log(apples);
40. 40.⚡ Which word makes a new variable? (a) let (b) make (c) give (d) put

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