JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 651 · 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 = "Kabir";
   alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
2. 2.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) let (d) console.log()
3. 3.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) console.log() (d) if
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "4";
   let y = 1;
   console.log(x + y); (a) 5 (b) Error (c) 41
5. 5.⚡ What number does this code print?
   let a = 5;
   let b = 11;
   console.log(a * b);
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hi, " + name + "!"); (a) Hi, Zoya! (b) Zoya (c) Hi, name! (d) name
7. 7.⚡ Where does console.log() show its output? (a) in the address bar (b) on the title bar (c) on the printer (d) in the console
8. 8.⚡ What number does this code print?
   let a = 4;
   let b = 8;
   console.log(a * b);
9. 9.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <style> (d) <script>
10. 10.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) if (d) console.log()
11. 11.⚡ What number does this code print?
    let a = 4;
    let b = 6;
    console.log(a * b);
12. 12.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .html (d) .jpg
13. 13.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) Meera (b) name (c) Hello, name! (d) Hello, Meera!
14. 14.⚡ Which JavaScript word repeats code? (a) alert() (b) for (c) console.log() (d) if
15. 15.⚡ What number does this code print?
    let a = 2;
    let b = 9;
    console.log(a * b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) Error (b) 52 (c) 7
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Hello, name! (c) name (d) Riya
18. 18.⚡ What number does this code print?
    let runs = 19;
    runs = runs + 20;
    runs = runs - 7;
    console.log(runs);
19. 19.⚡ What number does this code print?
    let runs = 13;
    runs = runs + 18;
    runs = runs - 26;
    console.log(runs);
20. 20.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) only colours (d) the page title
21. 21.⚡ What number does this code print?
    let marks = 9;
    marks = marks + 13;
    marks = marks - 6;
    console.log(marks);
22. 22.⚡ What does this code show?
    let name = "Aman";
    alert("Hi, " + name + "!"); (a) Aman (b) Hi, Aman! (c) Hi, name! (d) name
23. 23.⚡ What number does this code print?
    let apples = 9;
    apples = apples + 10;
    apples = apples - 5;
    console.log(apples);
24. 24.⚡ What number does this code print?
    let a = 35;
    let b = 34;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let apples = 27;
    apples = apples + 18;
    apples = apples - 11;
    console.log(apples);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 9 (b) Error (c) 72
27. 27.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hi, " + name + "!"); (a) Arjun (b) Hi, Arjun! (c) name (d) Hi, name!
28. 28.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
29. 29.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) console.log() (d) if
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) 13 (b) Error (c) 67
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) 92 (b) Error (c) 11
32. 32.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) Aman (b) Welcome, Aman! (c) name (d) Welcome, name!
33. 33.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
35. 35.⚡ What number does this code print?
    let a = 53;
    let b = 9;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let apples = 19;
    apples = apples + 18;
    apples = apples - 9;
    console.log(apples);
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 7;
    console.log(x + y); (a) 77 (b) Error (c) 14
38. 38.⚡ What number does this code print?
    let a = 9;
    let b = 10;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 15;
    coins = coins - 2;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let score = 8;
    score = score + 9;
    score = score - 10;
    console.log(score);

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