JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 464 · 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) alert() (c) for (d) console.log()
2. 2.⚡ What does this code show?
   let name = "Aman";
   console.log("Welcome, " + name + "!"); (a) name (b) Welcome, name! (c) Aman (d) Welcome, Aman!
3. 3.⚡ What does this code show?
   let name = "Zoya";
   alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
4. 4.⚡ What does this code show?
   let name = "Riya";
   console.log("Well done, " + name + "!"); (a) Well done, name! (b) Riya (c) Well done, Riya! (d) name
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 5;
   console.log(x + y); (a) 35 (b) Error (c) 8
6. 6.⚡ Which JavaScript word runs code when true? (a) if (b) for (c) let (d) alert()
7. 7.⚡ What does this code show?
   let name = "Kabir";
   alert("Hi, " + name + "!"); (a) Kabir (b) Hi, name! (c) Hi, Kabir! (d) name
8. 8.⚡ What number does this code print?
   let a = 20;
   let b = 19;
   console.log(a + b);
9. 9.⚡ Which word makes a new variable? (a) give (b) put (c) let (d) make
10. 10.⚡ What number does this code print?
    let a = 38;
    let b = 37;
    console.log(a - b);
11. 11.⚡ Which JavaScript word shows a pop-up box? (a) if (b) console.log() (c) let (d) alert()
12. 12.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) if
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 13 (b) 49 (c) Error
14. 14.⚡ What does this code show?
    let name = "Aman";
    alert("Welcome, " + name + "!"); (a) name (b) Welcome, Aman! (c) Aman (d) Welcome, name!
15. 15.⚡ What does this code show?
    let name = "Aman";
    alert("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
16. 16.⚡ What number does this code print?
    let score = 26;
    score = score + 14;
    score = score - 32;
    console.log(score);
17. 17.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Arjun (b) name (c) Welcome, Arjun! (d) Welcome, name!
18. 18.⚡ Which JavaScript word writes in the console? (a) let (b) for (c) alert() (d) console.log()
19. 19.⚡ What does alert() show? (a) a new tab (b) a table (c) a pop-up box (d) a picture
20. 20.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, name! (c) name (d) Welcome, Kabir!
21. 21.⚡ What number does this code print?
    let books = 23;
    books = books + 20;
    books = books - 12;
    console.log(books);
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 5;
    console.log(x + y); (a) Error (b) 25 (c) 7
23. 23.⚡ What does this code show?
    let name = "Zoya";
    console.log("Well done, " + name + "!"); (a) Zoya (b) Well done, name! (c) Well done, Zoya! (d) name
24. 24.⚡ What number does this code print?
    let coins = 27;
    coins = coins + 3;
    coins = coins - 24;
    console.log(coins);
25. 25.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <style> (d) <js>
26. 26.⚡ What number does this code print?
    let a = 45;
    let b = 40;
    console.log(a + b);
27. 27.⚡ What number does this code print?
    let apples = 30;
    apples = apples + 3;
    apples = apples - 12;
    console.log(apples);
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) 10 (b) Error (c) 73
29. 29.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) name (b) Kabir (c) Well done, Kabir! (d) Well done, name!
30. 30.⚡ What number does this code print?
    let score = 13;
    score = score + 12;
    score = score - 8;
    console.log(score);
31. 31.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Well done, name! (b) name (c) Meera (d) Well done, Meera!
32. 32.⚡ What number does this code print?
    let apples = 14;
    apples = apples + 8;
    apples = apples - 8;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 36;
    let b = 18;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let runs = 7;
    runs = runs + 15;
    runs = runs - 7;
    console.log(runs);
35. 35.⚡ What number does this code print?
    let a = 38;
    let b = 32;
    console.log(a + b);
36. 36.⚡ What number does this code print?
    let books = 26;
    books = books + 16;
    books = books - 42;
    console.log(books);
37. 37.⚡ What number does this code print?
    let a = 34;
    let b = 32;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let books = 29;
    books = books + 4;
    books = books - 10;
    console.log(books);
39. 39.⚡ What number does this code print?
    let a = 12;
    let b = 11;
    console.log(a - b);
40. 40.⚡ What number does this code print?
    let a = 10;
    let b = 40;
    console.log(a + b);

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