JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 755 · 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 = 34;
   let b = 19;
   console.log(a + b);
2. 2.⚡ What number does this code print?
   let a = 6;
   let b = 9;
   console.log(a * b);
3. 3.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) alert() (d) for
4. 4.⚡ A JavaScript file usually ends with which extension? (a) .html (b) .css (c) .js (d) .jpg
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) for (b) alert() (c) if (d) console.log()
6. 6.⚡ Which JavaScript word makes a new variable? (a) for (b) console.log() (c) let (d) if
7. 7.⚡ What does this code show?
   let name = "Aman";
   console.log("Hello, " + name + "!"); (a) name (b) Aman (c) Hello, Aman! (d) Hello, name!
8. 8.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <js> (c) <script> (d) <style>
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "2";
   let y = 1;
   console.log(x + y); (a) Error (b) 21 (c) 3
10. 10.⚡ Which JavaScript word runs code when true? (a) for (b) let (c) console.log() (d) if
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) Error (b) 32 (c) 5
12. 12.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
13. 13.⚡ What number does this code print?
    let marks = 26;
    marks = marks + 18;
    marks = marks - 16;
    console.log(marks);
14. 14.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) for (d) alert()
15. 15.⚡ What number does this code print?
    let score = 26;
    score = score + 13;
    score = score - 5;
    console.log(score);
16. 16.⚡ What number does this code print?
    let a = 22;
    let b = 1;
    console.log(a - b);
17. 17.⚡ What number does this code print?
    let a = 54;
    let b = 17;
    console.log(a - b);
18. 18.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let a = 15;
    let b = 24;
    console.log(a + b);
20. 20.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, name! (c) name (d) Hello, Zoya!
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 4;
    console.log(x + y); (a) 84 (b) Error (c) 12
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 4;
    console.log(x + y); (a) 14 (b) 5 (c) Error
23. 23.⚡ What number does this code print?
    let a = 58;
    let b = 15;
    console.log(a + b);
24. 24.⚡ Where does console.log() show its output? (a) in the console (b) in the address bar (c) on the printer (d) on the title bar
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Kabir! (c) Kabir (d) Hi, name!
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 2;
    console.log(x + y); (a) Error (b) 92 (c) 11
27. 27.⚡ What does this code show?
    let name = "Kabir";
    alert("Well done, " + name + "!"); (a) Well done, Kabir! (b) name (c) Well done, name! (d) Kabir
28. 28.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Zoya (b) name (c) Hello, name! (d) Hello, Zoya!
29. 29.⚡ What number does this code print?
    let coins = 9;
    coins = coins + 19;
    coins = coins - 3;
    console.log(coins);
30. 30.⚡ What number does this code print?
    let coins = 28;
    coins = coins + 8;
    coins = coins - 3;
    console.log(coins);
31. 31.⚡ What does JavaScript add to a web page? (a) the page title (b) the domain name (c) only colours (d) actions and changes
32. 32.⚡ What number does this code print?
    let score = 6;
    score = score + 11;
    score = score - 12;
    console.log(score);
33. 33.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
34. 34.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) Welcome, name! (c) name (d) Welcome, Aman!
35. 35.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Arjun (c) name (d) Welcome, Arjun!
36. 36.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 9;
    console.log(x + y); (a) 29 (b) 11 (c) Error
38. 38.⚡ What number does this code print?
    let runs = 28;
    runs = runs + 11;
    runs = runs - 6;
    console.log(runs);
39. 39.⚡ What number does this code print?
    let a = 29;
    let b = 37;
    console.log(a + b);
40. 40.⚡ What number does this code print?
    let apples = 20;
    apples = apples + 3;
    apples = apples - 15;
    console.log(apples);

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