JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 859 · 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.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the address bar (d) in the console
2. 2.⚡ Which JavaScript word runs code when true? (a) if (b) alert() (c) for (d) console.log()
3. 3.⚡ What number does this code print?
   let a = 27;
   let b = 14;
   console.log(a - b);
4. 4.⚡ What does this code show?
   let name = "Aman";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Aman! (d) Aman
5. 5.⚡ What number does this code print?
   let score = 5;
   score = score + 4;
   score = score - 6;
   console.log(score);
6. 6.⚡ What number does this code print?
   let coins = 12;
   coins = coins + 17;
   coins = coins - 27;
   console.log(coins);
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 9 (b) Error (c) 45
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) for (d) console.log()
9. 9.⚡ What number does this code print?
   let a = 54;
   let b = 12;
   console.log(a + b);
10. 10.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 78 (b) 15 (c) Error
12. 12.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
13. 13.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 3;
    apples = apples - 1;
    console.log(apples);
14. 14.⚡ What number does this code print?
    let coins = 15;
    coins = coins + 16;
    coins = coins - 10;
    console.log(coins);
15. 15.⚡ What number does this code print?
    let a = 9;
    let b = 6;
    console.log(a * b);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .js (d) .css
17. 17.⚡ What number does this code print?
    let a = 27;
    let b = 33;
    console.log(a + b);
18. 18.⚡ What does this code show?
    let name = "Kabir";
    alert("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) name (c) Welcome, name! (d) Kabir
19. 19.⚡ What number does this code print?
    let a = 28;
    let b = 12;
    console.log(a - b);
20. 20.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 5;
    apples = apples - 9;
    console.log(apples);
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, Meera! (b) Meera (c) name (d) Well done, name!
22. 22.⚡ What number does this code print?
    let a = 5;
    let b = 2;
    console.log(a * b);
23. 23.⚡ Which tag holds JavaScript in a page? (a) <script> (b) <style> (c) <code> (d) <js>
24. 24.⚡ What number does this code print?
    let a = 15;
    let b = 8;
    console.log(a - b);
25. 25.⚡ What number does this code print?
    let a = 38;
    let b = 22;
    console.log(a - b);
26. 26.⚡ What number does this code print?
    let score = 13;
    score = score + 20;
    score = score - 28;
    console.log(score);
27. 27.⚡ What number does this code print?
    let a = 44;
    let b = 19;
    console.log(a + b);
28. 28.⚡ What number does this code print?
    let a = 32;
    let b = 29;
    console.log(a - b);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 1;
    console.log(x + y); (a) Error (b) 4 (c) 31
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 1;
    console.log(x + y); (a) Error (b) 71 (c) 8
31. 31.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Hello, Kabir! (b) name (c) Hello, name! (d) Kabir
32. 32.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) name (c) Well done, name! (d) Zoya
33. 33.⚡ What number does this code print?
    let a = 42;
    let b = 15;
    console.log(a - b);
34. 34.⚡ What number does this code print?
    let apples = 22;
    apples = apples + 11;
    apples = apples - 25;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let a = 25;
    let b = 40;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 5;
    coins = coins - 4;
    console.log(coins);
37. 37.⚡ What does JavaScript add to a web page? (a) the page title (b) only colours (c) actions and changes (d) the domain name
38. 38.⚡ What number does this code print?
    let runs = 5;
    runs = runs + 10;
    runs = runs - 14;
    console.log(runs);
39. 39.⚡ Which JavaScript word repeats code? (a) alert() (b) console.log() (c) for (d) if
40. 40.⚡ What does this code show?
    let name = "Riya";
    alert("Hi, " + name + "!"); (a) Riya (b) Hi, name! (c) name (d) Hi, Riya!

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