JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 949 · 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) console.log() (b) alert() (c) let (d) for
2. 2.⚡ Which JavaScript word repeats code? (a) for (b) let (c) console.log() (d) if
3. 3.⚡ 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
4. 4.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) actions and changes (d) only colours
5. 5.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Zoya! (c) Hi, name! (d) Zoya
6. 6.⚡ What does this code show?
   let name = "Arjun";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
7. 7.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <script> (c) <style> (d) <code>
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) if (d) for
9. 9.⚡ What number does this code print?
   let a = 10;
   let b = 35;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 11;
    apples = apples - 11;
    console.log(apples);
11. 11.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
12. 12.⚡ What number does this code print?
    let a = 18;
    let b = 19;
    console.log(a + b);
13. 13.⚡ Where does console.log() show its output? (a) in the console (b) on the title bar (c) in the address bar (d) on the printer
14. 14.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) let (d) console.log()
15. 15.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 4;
    console.log(x + y); (a) Error (b) 11 (c) 74
18. 18.⚡ What number does this code print?
    let a = 10;
    let b = 2;
    console.log(a + b);
19. 19.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
20. 20.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 7;
    runs = runs - 1;
    console.log(runs);
21. 21.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
22. 22.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
23. 23.⚡ What number does this code print?
    let score = 15;
    score = score + 6;
    score = score - 21;
    console.log(score);
24. 24.⚡ 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
25. 25.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Meera (c) Hello, name! (d) Hello, Meera!
26. 26.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 20;
    runs = runs - 7;
    console.log(runs);
27. 27.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 15;
    runs = runs - 19;
    console.log(runs);
28. 28.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Hello, Aman! (b) Aman (c) name (d) Hello, name!
29. 29.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 5;
    console.log(x + y); (a) Error (b) 55 (c) 10
31. 31.⚡ What number does this code print?
    let a = 41;
    let b = 31;
    console.log(a + b);
32. 32.⚡ What number does this code print?
    let score = 13;
    score = score + 15;
    score = score - 24;
    console.log(score);
33. 33.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 8;
    apples = apples - 4;
    console.log(apples);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) Error (b) 11 (c) 29
35. 35.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Riya (b) name (c) Welcome, Riya! (d) Welcome, name!
36. 36.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) name (b) Aman (c) Hi, name! (d) Hi, Aman!
37. 37.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 5;
    apples = apples - 1;
    console.log(apples);
38. 38.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 5;
    console.log(x + y); (a) 65 (b) 11 (c) Error
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, name! (c) Riya (d) Hello, Riya!

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