JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 718 · 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.⚡ Which JavaScript word repeats code? (a) let (b) console.log() (c) if (d) for
2. 2.⚡ Which JavaScript word writes in the console? (a) if (b) console.log() (c) for (d) alert()
3. 3.⚡ What number does this code print?
   let a = 7;
   let b = 31;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let a = 33;
   let b = 28;
   console.log(a - b);
5. 5.⚡ Which JavaScript word runs code when true? (a) let (b) console.log() (c) for (d) if
6. 6.⚡ What number does this code print?
   let score = 7;
   score = score + 16;
   score = score - 23;
   console.log(score);
7. 7.⚡ What number does this code print?
   let marks = 7;
   marks = marks + 3;
   marks = marks - 8;
   console.log(marks);
8. 8.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Riya (c) Hi, Riya! (d) name
9. 9.⚡ What does this code show?
   let name = "Arjun";
   alert("Welcome, " + name + "!"); (a) Arjun (b) Welcome, name! (c) name (d) Welcome, Arjun!
10. 10.⚡ Where does console.log() show its output? (a) on the title bar (b) in the address bar (c) in the console (d) on the printer
11. 11.⚡ What number does this code print?
    let a = 60;
    let b = 36;
    console.log(a + b);
12. 12.⚡ What number does this code print?
    let a = 21;
    let b = 16;
    console.log(a + b);
13. 13.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 16;
    coins = coins - 1;
    console.log(coins);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
15. 15.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) let (c) alert() (d) if
16. 16.⚡ Which JavaScript word makes a new variable? (a) alert() (b) let (c) for (d) console.log()
17. 17.⚡ What does this code show?
    let name = "Riya";
    console.log("Well done, " + name + "!"); (a) name (b) Well done, name! (c) Well done, Riya! (d) Riya
18. 18.⚡ Which word makes a new variable? (a) make (b) give (c) let (d) put
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) Aman (b) Hello, Aman! (c) name (d) Hello, name!
20. 20.⚡ What does this code show?
    let name = "Meera";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Meera! (c) Meera (d) Hello, name!
21. 21.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) Meera (b) Hello, name! (c) Hello, Meera! (d) name
22. 22.⚡ What number does this code print?
    let a = 38;
    let b = 27;
    console.log(a - b);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) Error (b) 16 (c) 88
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 9;
    console.log(x + y); (a) 18 (b) Error (c) 99
25. 25.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 2;
    console.log(x + y); (a) 52 (b) Error (c) 7
26. 26.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
27. 27.⚡ What number does this code print?
    let books = 6;
    books = books + 6;
    books = books - 8;
    console.log(books);
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) name (b) Zoya (c) Welcome, Zoya! (d) Welcome, name!
29. 29.⚡ What number does this code print?
    let score = 21;
    score = score + 7;
    score = score - 26;
    console.log(score);
30. 30.⚡ What number does this code print?
    let apples = 28;
    apples = apples + 9;
    apples = apples - 21;
    console.log(apples);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, Zoya! (d) Hello, name!
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 3;
    console.log(x + y); (a) 6 (b) 33 (c) Error
33. 33.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) Hi, Kabir! (b) Kabir (c) Hi, name! (d) name
34. 34.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 8;
    console.log(x + y); (a) Error (b) 78 (c) 15
36. 36.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <code> (d) <script>
37. 37.⚡ What number does this code print?
    let runs = 23;
    runs = runs + 8;
    runs = runs - 30;
    console.log(runs);
38. 38.⚡ What number does this code print?
    let a = 5;
    let b = 8;
    console.log(a * b);
39. 39.⚡ What number does this code print?
    let a = 56;
    let b = 1;
    console.log(a + b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Meera (c) Welcome, Meera! (d) name

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