JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 513 · 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 does alert() show? (a) a table (b) a new tab (c) a pop-up box (d) a picture
2. 2.⚡ What does this code show?
   let name = "Meera";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Meera (c) name (d) Hello, Meera!
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "9";
   let y = 1;
   console.log(x + y); (a) 10 (b) Error (c) 91
4. 4.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) on the printer (d) in the console
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 7;
   console.log(x + y); (a) 13 (b) 67 (c) Error
6. 6.⚡ Which JavaScript word runs code when true? (a) console.log() (b) if (c) for (d) alert()
7. 7.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) Riya (d) name
8. 8.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .css (d) .html
9. 9.⚡ What number does this code print?
   let a = 41;
   let b = 17;
   console.log(a + b);
10. 10.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) console.log() (c) for (d) if
11. 11.⚡ What number does this code print?
    let a = 53;
    let b = 31;
    console.log(a + b);
12. 12.⚡ Which JavaScript word writes in the console? (a) let (b) if (c) console.log() (d) for
13. 13.⚡ What number does this code print?
    let a = 38;
    let b = 22;
    console.log(a - b);
14. 14.⚡ What number does this code print?
    let score = 9;
    score = score + 15;
    score = score - 7;
    console.log(score);
15. 15.⚡ What number does this code print?
    let a = 46;
    let b = 32;
    console.log(a + b);
16. 16.⚡ What number does this code print?
    let runs = 27;
    runs = runs + 2;
    runs = runs - 24;
    console.log(runs);
17. 17.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 2;
    apples = apples - 1;
    console.log(apples);
18. 18.⚡ Which JavaScript word repeats code? (a) console.log() (b) for (c) if (d) alert()
19. 19.⚡ What number does this code print?
    let a = 10;
    let b = 36;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Zoya (d) Welcome, name!
21. 21.⚡ What does JavaScript add to a web page? (a) the page title (b) actions and changes (c) the domain name (d) only colours
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Aman (c) Welcome, name! (d) name
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) Error (c) 5
24. 24.⚡ What number does this code print?
    let a = 52;
    let b = 38;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let score = 15;
    score = score + 18;
    score = score - 32;
    console.log(score);
26. 26.⚡ What number does this code print?
    let a = 42;
    let b = 28;
    console.log(a - b);
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) 46 (b) 10 (c) Error
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 37;
    console.log(a + b);
29. 29.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 16;
    runs = runs - 30;
    console.log(runs);
30. 30.⚡ What number does this code print?
    let a = 35;
    let b = 26;
    console.log(a + b);
31. 31.⚡ 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
32. 32.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 6;
    apples = apples - 5;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 6;
    apples = apples - 15;
    console.log(apples);
34. 34.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
35. 35.⚡ 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
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 6;
    console.log(x + y); (a) 14 (b) Error (c) 86
37. 37.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 6;
    marks = marks - 1;
    console.log(marks);
38. 38.⚡ What number does this code print?
    let a = 52;
    let b = 15;
    console.log(a + b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) 4 (b) 31 (c) Error
40. 40.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) name (b) Zoya (c) Hi, name! (d) Hi, Zoya!

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