JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 989 · 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.⚡ What number does this code print?
   let a = 23;
   let b = 29;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 9;
   let b = 8;
   console.log(a * b);
3. 3.⚡ What does this code show?
   let name = "Zoya";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
4. 4.⚡ What number does this code print?
   let books = 26;
   books = books + 20;
   books = books - 2;
   console.log(books);
5. 5.⚡ Which JavaScript word makes a new variable? (a) if (b) console.log() (c) let (d) for
6. 6.⚡ What number does this code print?
   let runs = 6;
   runs = runs + 13;
   runs = runs - 13;
   console.log(runs);
7. 7.⚡ What does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
8. 8.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) let (d) alert()
9. 9.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) let (d) for
10. 10.⚡ What number does this code print?
    let a = 26;
    let b = 13;
    console.log(a + b);
11. 11.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .html (c) .jpg (d) .css
12. 12.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Aman (d) Hello, Aman!
13. 13.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 3;
    marks = marks - 5;
    console.log(marks);
14. 14.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
15. 15.⚡ What number does this code print?
    let a = 49;
    let b = 17;
    console.log(a - b);
16. 16.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 20;
    runs = runs - 21;
    console.log(runs);
17. 17.⚡ Where does console.log() show its output? (a) in the address bar (b) on the printer (c) on the title bar (d) in the console
18. 18.⚡ What number does this code print?
    let a = 59;
    let b = 32;
    console.log(a - b);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 6;
    console.log(x + y); (a) 36 (b) 9 (c) Error
20. 20.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
21. 21.⚡ What number does this code print?
    let score = 26;
    score = score + 18;
    score = score - 11;
    console.log(score);
22. 22.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Arjun! (c) Arjun (d) Hi, name!
23. 23.⚡ What number does this code print?
    let a = 7;
    let b = 3;
    console.log(a * b);
24. 24.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
25. 25.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 7;
    apples = apples - 17;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 9;
    coins = coins - 26;
    console.log(coins);
27. 27.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a * b);
28. 28.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Arjun! (d) Arjun
29. 29.⚡ What number does this code print?
    let a = 7;
    let b = 6;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 5;
    let b = 5;
    console.log(a * b);
31. 31.⚡ What number does this code print?
    let score = 18;
    score = score + 6;
    score = score - 4;
    console.log(score);
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
33. 33.⚡ What number does this code print?
    let a = 14;
    let b = 26;
    console.log(a + b);
34. 34.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) if (d) alert()
35. 35.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Kabir (d) Hello, Kabir!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 6 (c) 42
37. 37.⚡ 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
38. 38.⚡ What number does this code print?
    let a = 21;
    let b = 6;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
40. 40.⚡ What number does this code print?
    let apples = 25;
    apples = apples + 4;
    apples = apples - 5;
    console.log(apples);

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