JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 814 · 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 tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
2. 2.⚡ What number does this code print?
   let apples = 9;
   apples = apples + 2;
   apples = apples - 5;
   console.log(apples);
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 1;
   console.log(x + y); (a) 2 (b) Error (c) 11
4. 4.⚡ Which word makes a new variable? (a) give (b) make (c) let (d) put
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
6. 6.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
7. 7.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the title bar (d) on the printer
8. 8.⚡ What does this code show?
   let name = "Kabir";
   alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Kabir! (c) name (d) Kabir
9. 9.⚡ Which JavaScript word repeats code? (a) let (b) alert() (c) for (d) console.log()
10. 10.⚡ What number does this code print?
    let coins = 19;
    coins = coins + 15;
    coins = coins - 24;
    console.log(coins);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 58 (b) Error (c) 13
12. 12.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Kabir (b) name (c) Welcome, Kabir! (d) Welcome, name!
13. 13.⚡ What number does this code print?
    let a = 24;
    let b = 22;
    console.log(a + b);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
15. 15.⚡ Which JavaScript word makes a new variable? (a) for (b) alert() (c) let (d) console.log()
16. 16.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) Error (b) 7 (c) 16
18. 18.⚡ Which JavaScript word runs code when true? (a) for (b) if (c) console.log() (d) alert()
19. 19.⚡ What number does this code print?
    let a = 23;
    let b = 5;
    console.log(a - b);
20. 20.⚡ Which JavaScript word writes in the console? (a) console.log() (b) for (c) alert() (d) let
21. 21.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 19;
    runs = runs - 15;
    console.log(runs);
22. 22.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) name (d) Hi, name!
23. 23.⚡ What number does this code print?
    let score = 18;
    score = score + 7;
    score = score - 10;
    console.log(score);
24. 24.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 12;
    runs = runs - 17;
    console.log(runs);
25. 25.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 14;
    apples = apples - 6;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let marks = 8;
    marks = marks + 18;
    marks = marks - 23;
    console.log(marks);
27. 27.⚡ What number does this code print?
    let a = 7;
    let b = 2;
    console.log(a * b);
28. 28.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) alert() (d) let
29. 29.⚡ What number does this code print?
    let a = 2;
    let b = 4;
    console.log(a * b);
30. 30.⚡ What number does this code print?
    let a = 13;
    let b = 2;
    console.log(a - b);
31. 31.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 19;
    coins = coins - 37;
    console.log(coins);
32. 32.⚡ What number does this code print?
    let score = 20;
    score = score + 12;
    score = score - 1;
    console.log(score);
33. 33.⚡ What number does this code print?
    let marks = 25;
    marks = marks + 16;
    marks = marks - 11;
    console.log(marks);
34. 34.⚡ What number does this code print?
    let a = 10;
    let b = 4;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let score = 16;
    score = score + 6;
    score = score - 5;
    console.log(score);
36. 36.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 14;
    marks = marks - 5;
    console.log(marks);
37. 37.⚡ What number does this code print?
    let a = 27;
    let b = 16;
    console.log(a - b);
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Welcome, Riya! (c) Riya (d) name
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Meera! (c) Welcome, name! (d) Meera
40. 40.⚡ What number does this code print?
    let a = 12;
    let b = 21;
    console.log(a + b);

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