JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 708 · 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) in the console (b) in the address bar (c) on the printer (d) on the title bar
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Kabir (d) Hi, name!
3. 3.⚡ Which JavaScript word repeats code? (a) console.log() (b) let (c) alert() (d) for
4. 4.⚡ What number does this code print?
   let a = 9;
   let b = 39;
   console.log(a + b);
5. 5.⚡ Which JavaScript word writes in the console? (a) let (b) alert() (c) console.log() (d) for
6. 6.⚡ What number does this code print?
   let coins = 14;
   coins = coins + 14;
   coins = coins - 25;
   console.log(coins);
7. 7.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
8. 8.⚡ Which JavaScript word shows a pop-up box? (a) if (b) for (c) alert() (d) console.log()
9. 9.⚡ What number does this code print?
   let score = 27;
   score = score + 17;
   score = score - 29;
   console.log(score);
10. 10.⚡ What number does this code print?
    let a = 33;
    let b = 19;
    console.log(a - b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
12. 12.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 12;
    coins = coins - 16;
    console.log(coins);
13. 13.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .html (c) .css (d) .js
14. 14.⚡ What number does this code print?
    let a = 24;
    let b = 10;
    console.log(a + b);
15. 15.⚡ What number does this code print?
    let a = 36;
    let b = 27;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 2;
    console.log(x + y); (a) Error (b) 10 (c) 82
17. 17.⚡ What number does this code print?
    let a = 20;
    let b = 8;
    console.log(a + b);
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 8;
    console.log(x + y); (a) 13 (b) Error (c) 58
19. 19.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Kabir (d) Welcome, Kabir!
20. 20.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 17;
    apples = apples - 21;
    console.log(apples);
21. 21.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
22. 22.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, Kabir! (d) Well done, name!
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Hi, name! (b) Zoya (c) name (d) Hi, Zoya!
24. 24.⚡ What number does this code print?
    let score = 25;
    score = score + 11;
    score = score - 1;
    console.log(score);
25. 25.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 2;
    apples = apples - 10;
    console.log(apples);
26. 26.⚡ What number does this code print?
    let a = 41;
    let b = 32;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let a = 35;
    let b = 12;
    console.log(a + b);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) Error (b) 16 (c) 97
29. 29.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) Well done, name! (d) name
30. 30.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) for (d) console.log()
31. 31.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
32. 32.⚡ What does alert() show? (a) a picture (b) a pop-up box (c) a table (d) a new tab
33. 33.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 3;
    runs = runs - 9;
    console.log(runs);
34. 34.⚡ What number does this code print?
    let a = 11;
    let b = 6;
    console.log(a * b);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Hello, name! (d) Zoya
36. 36.⚡ What number does this code print?
    let a = 9;
    let b = 7;
    console.log(a * b);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 12 (b) 84 (c) Error
38. 38.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, Meera! (c) name (d) Hello, name!
39. 39.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 6;
    apples = apples - 13;
    console.log(apples);
40. 40.⚡ Which JavaScript word runs code when true? (a) alert() (b) if (c) console.log() (d) let

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