JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 810 · 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 this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Hi, Riya! (c) name (d) Riya
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) console.log() (c) if (d) alert()
3. 3.⚡ What number does this code print?
   let a = 39;
   let b = 4;
   console.log(a - b);
4. 4.⚡ What number does this code print?
   let coins = 26;
   coins = coins + 5;
   coins = coins - 6;
   console.log(coins);
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) console.log() (d) if
6. 6.⚡ What number does this code print?
   let a = 14;
   let b = 31;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 28;
   let b = 13;
   console.log(a - b);
8. 8.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Well done, Riya! (b) Well done, name! (c) Riya (d) name
9. 9.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) name (b) Welcome, Zoya! (c) Welcome, name! (d) Zoya
10. 10.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
11. 11.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Meera (d) Welcome, Meera!
12. 12.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) Well done, Riya! (b) Riya (c) name (d) Well done, name!
13. 13.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <style> (c) <script> (d) <js>
14. 14.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 2;
    runs = runs - 22;
    console.log(runs);
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 7;
    console.log(x + y); (a) 37 (b) 10 (c) Error
16. 16.⚡ What number does this code print?
    let a = 11;
    let b = 4;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 19;
    apples = apples - 25;
    console.log(apples);
18. 18.⚡ What number does this code print?
    let score = 25;
    score = score + 8;
    score = score - 3;
    console.log(score);
19. 19.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 6;
    console.log(x + y); (a) 15 (b) Error (c) 96
20. 20.⚡ What number does this code print?
    let a = 7;
    let b = 4;
    console.log(a * b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
22. 22.⚡ What number does this code print?
    let a = 18;
    let b = 8;
    console.log(a + b);
23. 23.⚡ Which JavaScript word writes in the console? (a) alert() (b) for (c) console.log() (d) let
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) Error (b) 18 (c) 99
25. 25.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .jpg (c) .css (d) .js
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, Zoya! (c) name (d) Hi, name!
27. 27.⚡ What number does this code print?
    let marks = 16;
    marks = marks + 10;
    marks = marks - 6;
    console.log(marks);
28. 28.⚡ What number does this code print?
    let a = 3;
    let b = 12;
    console.log(a * b);
29. 29.⚡ Which JavaScript word makes a new variable? (a) let (b) console.log() (c) alert() (d) if
30. 30.⚡ What number does this code print?
    let a = 20;
    let b = 7;
    console.log(a + b);
31. 31.⚡ What number does this code print?
    let apples = 24;
    apples = apples + 16;
    apples = apples - 7;
    console.log(apples);
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Aman (c) Hi, Aman! (d) name
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 5;
    console.log(x + y); (a) 12 (b) 75 (c) Error
34. 34.⚡ What number does this code print?
    let a = 42;
    let b = 23;
    console.log(a + b);
35. 35.⚡ Which word makes a new variable? (a) make (b) let (c) give (d) put
36. 36.⚡ What number does this code print?
    let a = 8;
    let b = 12;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 16;
    apples = apples - 1;
    console.log(apples);
38. 38.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) 12 (b) Error (c) 66
39. 39.⚡ What number does this code print?
    let a = 9;
    let b = 19;
    console.log(a + b);
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 5;
    console.log(x + y); (a) 15 (b) 6 (c) Error

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