JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 762 · 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 = "Arjun";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) name (d) Hi, Arjun!
2. 2.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) Error (b) 15 (c) 87
3. 3.⚡ What does this code print? (Look at the quotes!)
   let x = "7";
   let y = 5;
   console.log(x + y); (a) 12 (b) Error (c) 75
4. 4.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Well done, " + name + "!"); (a) Riya (b) Well done, name! (c) Well done, Riya! (d) name
6. 6.⚡ What number does this code print?
   let a = 18;
   let b = 8;
   console.log(a + b);
7. 7.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <code> (d) <script>
8. 8.⚡ What number does this code print?
   let a = 33;
   let b = 10;
   console.log(a - b);
9. 9.⚡ Which JavaScript word writes in the console? (a) for (b) let (c) alert() (d) console.log()
10. 10.⚡ What does JavaScript add to a web page? (a) the domain name (b) the page title (c) only colours (d) actions and changes
11. 11.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
12. 12.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 1;
    console.log(x + y); (a) Error (b) 61 (c) 7
13. 13.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 15;
    apples = apples - 10;
    console.log(apples);
14. 14.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) alert() (d) if
15. 15.⚡ Which JavaScript word makes a new variable? (a) let (b) alert() (c) for (d) if
16. 16.⚡ What number does this code print?
    let a = 33;
    let b = 31;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 7;
    runs = runs - 23;
    console.log(runs);
18. 18.⚡ What number does this code print?
    let score = 8;
    score = score + 5;
    score = score - 8;
    console.log(score);
19. 19.⚡ What does this code show?
    let name = "Aman";
    console.log("Hi, " + name + "!"); (a) Aman (b) name (c) Hi, Aman! (d) Hi, name!
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) 15 (b) Error (c) 78
21. 21.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Aman (b) Well done, Aman! (c) Well done, name! (d) name
22. 22.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Aman! (d) Aman
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) Error (b) 72 (c) 9
24. 24.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) for (d) if
25. 25.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 8;
    runs = runs - 2;
    console.log(runs);
26. 26.⚡ What number does this code print?
    let a = 13;
    let b = 21;
    console.log(a + b);
27. 27.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Riya (b) Hello, Riya! (c) Hello, name! (d) name
28. 28.⚡ Which word makes a new variable? (a) put (b) give (c) make (d) let
29. 29.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
30. 30.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .css (c) .js (d) .html
31. 31.⚡ What number does this code print?
    let apples = 12;
    apples = apples + 19;
    apples = apples - 8;
    console.log(apples);
32. 32.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Welcome, Kabir! (b) Welcome, name! (c) name (d) Kabir
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 8;
    console.log(x + y); (a) 9 (b) 18 (c) Error
34. 34.⚡ What number does this code print?
    let apples = 29;
    apples = apples + 17;
    apples = apples - 13;
    console.log(apples);
35. 35.⚡ What number does this code print?
    let runs = 9;
    runs = runs + 20;
    runs = runs - 8;
    console.log(runs);
36. 36.⚡ What number does this code print?
    let coins = 8;
    coins = coins + 9;
    coins = coins - 1;
    console.log(coins);
37. 37.⚡ What number does this code print?
    let a = 28;
    let b = 5;
    console.log(a + b);
38. 38.⚡ What does alert() show? (a) a table (b) a new tab (c) a picture (d) a pop-up box
39. 39.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) Error (c) 7
40. 40.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 11 (b) Error (c) 92

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