JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 748 · 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) for (b) let (c) alert() (d) console.log()
2. 2.⚡ Which word makes a new variable? (a) make (b) put (c) let (d) give
3. 3.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <js> (c) <style> (d) <code>
4. 4.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) console.log()
5. 5.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) if (d) for
6. 6.⚡ What number does this code print?
   let coins = 10;
   coins = coins + 6;
   coins = coins - 7;
   console.log(coins);
7. 7.⚡ What number does this code print?
   let marks = 22;
   marks = marks + 6;
   marks = marks - 28;
   console.log(marks);
8. 8.⚡ What number does this code print?
   let a = 2;
   let b = 11;
   console.log(a * b);
9. 9.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 10;
    console.log(a * b);
11. 11.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) let (d) if
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) Error (c) 18
13. 13.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Aman (d) Well done, Aman!
14. 14.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) Kabir (c) name (d) Hello, name!
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 6 (c) 51
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 2;
    console.log(x + y); (a) Error (b) 42 (c) 6
18. 18.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
19. 19.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 20;
    runs = runs - 36;
    console.log(runs);
20. 20.⚡ What number does this code print?
    let a = 5;
    let b = 12;
    console.log(a * b);
21. 21.⚡ What does alert() show? (a) a pop-up box (b) a new tab (c) a picture (d) a table
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Aman (d) Well done, Aman!
23. 23.⚡ What number does this code print?
    let score = 17;
    score = score + 20;
    score = score - 16;
    console.log(score);
24. 24.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, Arjun! (d) Well done, name!
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 10 (c) 46
26. 26.⚡ What number does this code print?
    let score = 29;
    score = score + 15;
    score = score - 36;
    console.log(score);
27. 27.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Zoya (d) Well done, Zoya!
28. 28.⚡ What number does this code print?
    let a = 19;
    let b = 9;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 9;
    apples = apples - 17;
    console.log(apples);
30. 30.⚡ What number does this code print?
    let marks = 11;
    marks = marks + 15;
    marks = marks - 2;
    console.log(marks);
31. 31.⚡ Which JavaScript word runs code when true? (a) for (b) console.log() (c) alert() (d) if
32. 32.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 9;
    coins = coins - 24;
    console.log(coins);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
34. 34.⚡ What does JavaScript add to a web page? (a) actions and changes (b) only colours (c) the page title (d) the domain name
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 97 (b) Error (c) 16
36. 36.⚡ What number does this code print?
    let runs = 21;
    runs = runs + 20;
    runs = runs - 5;
    console.log(runs);
37. 37.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, Meera! (c) Well done, name! (d) name
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 15;
    console.log(a + b);
39. 39.⚡ What number does this code print?
    let a = 6;
    let b = 12;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let score = 23;
    score = score + 9;
    score = score - 1;
    console.log(score);

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