JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 205 · 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 alert() show? (a) a new tab (b) a pop-up box (c) a table (d) a picture
2. 2.⚡ What number does this code print?
   let a = 18;
   let b = 39;
   console.log(a + b);
3. 3.⚡ What does JavaScript add to a web page? (a) actions and changes (b) the domain name (c) only colours (d) the page title
4. 4.⚡ What does this code print? (Look at the quotes!)
   let x = "6";
   let y = 4;
   console.log(x + y); (a) 10 (b) Error (c) 64
5. 5.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
6. 6.⚡ Which JavaScript word writes in the console? (a) if (b) alert() (c) let (d) console.log()
7. 7.⚡ What does this code show?
   let name = "Riya";
   alert("Welcome, " + name + "!"); (a) Welcome, name! (b) name (c) Welcome, Riya! (d) Riya
8. 8.⚡ Where does console.log() show its output? (a) on the title bar (b) on the printer (c) in the address bar (d) in the console
9. 9.⚡ What does this code show?
   let name = "Riya";
   console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) name (c) Hello, name! (d) Riya
10. 10.⚡ What does this code show?
    let name = "Meera";
    console.log("Welcome, " + name + "!"); (a) Welcome, Meera! (b) name (c) Meera (d) Welcome, name!
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) 11 (b) 56 (c) Error
12. 12.⚡ What number does this code print?
    let apples = 16;
    apples = apples + 16;
    apples = apples - 3;
    console.log(apples);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Welcome, name! (b) Zoya (c) name (d) Welcome, Zoya!
14. 14.⚡ Which JavaScript word repeats code? (a) if (b) let (c) for (d) alert()
15. 15.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, Arjun! (b) name (c) Hello, name! (d) Arjun
16. 16.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <code> (d) <js>
17. 17.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Hi, Zoya! (d) Zoya
18. 18.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) console.log() (d) for
19. 19.⚡ What number does this code print?
    let a = 7;
    let b = 33;
    console.log(a + b);
20. 20.⚡ What number does this code print?
    let score = 17;
    score = score + 12;
    score = score - 4;
    console.log(score);
21. 21.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) 13 (b) Error (c) 4
22. 22.⚡ What number does this code print?
    let runs = 22;
    runs = runs + 11;
    runs = runs - 10;
    console.log(runs);
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 6;
    console.log(x + y); (a) 7 (b) Error (c) 16
24. 24.⚡ What number does this code print?
    let a = 38;
    let b = 16;
    console.log(a + b);
25. 25.⚡ What number does this code print?
    let marks = 24;
    marks = marks + 4;
    marks = marks - 10;
    console.log(marks);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 7;
    console.log(x + y); (a) Error (b) 13 (c) 67
27. 27.⚡ What number does this code print?
    let coins = 13;
    coins = coins + 6;
    coins = coins - 12;
    console.log(coins);
28. 28.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .html (d) .js
29. 29.⚡ What number does this code print?
    let a = 34;
    let b = 6;
    console.log(a + b);
30. 30.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
31. 31.⚡ Which JavaScript word makes a new variable? (a) if (b) let (c) alert() (d) console.log()
32. 32.⚡ What number does this code print?
    let a = 44;
    let b = 29;
    console.log(a + b);
33. 33.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 3;
    console.log(x + y); (a) Error (b) 93 (c) 12
34. 34.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Zoya (c) Hello, Zoya! (d) Hello, name!
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) 5 (b) Error (c) 23
36. 36.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 8;
    apples = apples - 11;
    console.log(apples);
37. 37.⚡ Which JavaScript word runs code when true? (a) let (b) alert() (c) if (d) console.log()
38. 38.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Kabir! (c) Welcome, name! (d) Kabir
39. 39.⚡ What number does this code print?
    let coins = 22;
    coins = coins + 7;
    coins = coins - 3;
    console.log(coins);
40. 40.⚡ What number does this code print?
    let apples = 15;
    apples = apples + 6;
    apples = apples - 21;
    console.log(apples);

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