JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 368 · 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 number does this code print?
   let a = 4;
   let b = 7;
   console.log(a * b);
2. 2.⚡ What does this code show?
   let name = "Zoya";
   alert("Welcome, " + name + "!"); (a) Welcome, Zoya! (b) Welcome, name! (c) name (d) Zoya
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 7;
   console.log(x + y); (a) Error (b) 9 (c) 27
4. 4.⚡ Which word makes a new variable? (a) give (b) put (c) make (d) let
5. 5.⚡ 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
6. 6.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) for (d) alert()
7. 7.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 8;
   console.log(x + y); (a) Error (b) 48 (c) 12
8. 8.⚡ What number does this code print?
   let runs = 29;
   runs = runs + 4;
   runs = runs - 7;
   console.log(runs);
9. 9.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) Welcome, Aman! (b) Welcome, name! (c) Aman (d) name
10. 10.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) if (d) console.log()
11. 11.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
12. 12.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) the page title (d) actions and changes
13. 13.⚡ What number does this code print?
    let coins = 25;
    coins = coins + 19;
    coins = coins - 31;
    console.log(coins);
14. 14.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 49 (b) Error (c) 13
15. 15.⚡ What number does this code print?
    let runs = 20;
    runs = runs + 10;
    runs = runs - 20;
    console.log(runs);
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
17. 17.⚡ Which JavaScript word runs code when true? (a) console.log() (b) alert() (c) for (d) if
18. 18.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 23 (b) 5 (c) Error
19. 19.⚡ Which JavaScript word shows a pop-up box? (a) let (b) for (c) alert() (d) if
20. 20.⚡ What number does this code print?
    let a = 12;
    let b = 23;
    console.log(a + b);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 5;
    console.log(x + y); (a) 95 (b) Error (c) 14
22. 22.⚡ What number does this code print?
    let score = 12;
    score = score + 13;
    score = score - 4;
    console.log(score);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 8;
    console.log(x + y); (a) Error (b) 14 (c) 68
24. 24.⚡ What number does this code print?
    let a = 56;
    let b = 28;
    console.log(a + b);
25. 25.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
26. 26.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 11;
    apples = apples - 12;
    console.log(apples);
27. 27.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Hello, Arjun! (c) name (d) Arjun
28. 28.⚡ What number does this code print?
    let a = 9;
    let b = 5;
    console.log(a - b);
29. 29.⚡ What number does this code print?
    let a = 54;
    let b = 15;
    console.log(a - b);
30. 30.⚡ What number does this code print?
    let a = 46;
    let b = 26;
    console.log(a + b);
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 59 (b) Error (c) 14
32. 32.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
33. 33.⚡ What number does this code print?
    let a = 15;
    let b = 3;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 2;
    let b = 3;
    console.log(a * b);
35. 35.⚡ What number does this code print?
    let apples = 11;
    apples = apples + 17;
    apples = apples - 13;
    console.log(apples);
36. 36.⚡ What does this code show?
    let name = "Aman";
    console.log("Hello, " + name + "!"); (a) Hello, Aman! (b) Hello, name! (c) Aman (d) name
37. 37.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) Welcome, Zoya! (d) name
38. 38.⚡ What does this code show?
    let name = "Arjun";
    alert("Well done, " + name + "!"); (a) Arjun (b) Well done, Arjun! (c) name (d) Well done, name!
39. 39.⚡ What number does this code print?
    let apples = 10;
    apples = apples + 7;
    apples = apples - 11;
    console.log(apples);
40. 40.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 3;
    apples = apples - 6;
    console.log(apples);

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