JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 815 · 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 runs code when true? (a) let (b) alert() (c) for (d) if
2. 2.⚡ What does this code show?
   let name = "Arjun";
   alert("Hi, " + name + "!"); (a) Arjun (b) name (c) Hi, name! (d) Hi, Arjun!
3. 3.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
4. 4.⚡ Which JavaScript word writes in the console? (a) console.log() (b) let (c) alert() (d) if
5. 5.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 3;
   console.log(x + y); (a) 4 (b) 13 (c) Error
6. 6.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) Hi, name! (b) Kabir (c) name (d) Hi, Kabir!
7. 7.⚡ What number does this code print?
   let coins = 29;
   coins = coins + 3;
   coins = coins - 4;
   console.log(coins);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "8";
   let y = 7;
   console.log(x + y); (a) 15 (b) 87 (c) Error
9. 9.⚡ What does this code print? (Look at the quotes!)
   let x = "1";
   let y = 2;
   console.log(x + y); (a) 3 (b) Error (c) 12
10. 10.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
11. 11.⚡ What does this code show?
    let name = "Arjun";
    console.log("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Welcome, name! (c) Arjun (d) name
12. 12.⚡ What number does this code print?
    let a = 15;
    let b = 11;
    console.log(a - b);
13. 13.⚡ What number does this code print?
    let coins = 18;
    coins = coins + 11;
    coins = coins - 19;
    console.log(coins);
14. 14.⚡ A JavaScript file usually ends with which extension? (a) .jpg (b) .js (c) .html (d) .css
15. 15.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 2;
    console.log(x + y); (a) Error (b) 4 (c) 22
16. 16.⚡ 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
17. 17.⚡ What number does this code print?
    let a = 4;
    let b = 2;
    console.log(a * b);
18. 18.⚡ What number does this code print?
    let a = 40;
    let b = 20;
    console.log(a - b);
19. 19.⚡ What does this code show?
    let name = "Arjun";
    console.log("Hello, " + name + "!"); (a) Hello, name! (b) Arjun (c) Hello, Arjun! (d) name
20. 20.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) for (c) if (d) alert()
21. 21.⚡ What number does this code print?
    let runs = 8;
    runs = runs + 17;
    runs = runs - 4;
    console.log(runs);
22. 22.⚡ 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
23. 23.⚡ What does this code print? (Look at the quotes!)
    let x = "9";
    let y = 7;
    console.log(x + y); (a) 16 (b) Error (c) 97
24. 24.⚡ Which word makes a new variable? (a) give (b) let (c) make (d) put
25. 25.⚡ What number does this code print?
    let a = 59;
    let b = 1;
    console.log(a + b);
26. 26.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Zoya! (c) Zoya (d) Hello, name!
27. 27.⚡ Which JavaScript word repeats code? (a) if (b) let (c) console.log() (d) for
28. 28.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) alert()
29. 29.⚡ What number does this code print?
    let marks = 19;
    marks = marks + 11;
    marks = marks - 4;
    console.log(marks);
30. 30.⚡ What number does this code print?
    let coins = 20;
    coins = coins + 17;
    coins = coins - 15;
    console.log(coins);
31. 31.⚡ What number does this code print?
    let a = 8;
    let b = 11;
    console.log(a * b);
32. 32.⚡ What number does this code print?
    let apples = 8;
    apples = apples + 10;
    apples = apples - 18;
    console.log(apples);
33. 33.⚡ What number does this code print?
    let a = 26;
    let b = 26;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 18;
    let b = 11;
    console.log(a - b);
35. 35.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
36. 36.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) 9 (b) Error (c) 63
37. 37.⚡ What number does this code print?
    let a = 36;
    let b = 15;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 40;
    let b = 38;
    console.log(a - b);
39. 39.⚡ What does this code show?
    let name = "Meera";
    console.log("Hello, " + name + "!"); (a) name (b) Meera (c) Hello, Meera! (d) Hello, name!
40. 40.⚡ What does this code show?
    let name = "Arjun";
    console.log("Well done, " + name + "!"); (a) Arjun (b) name (c) Well done, Arjun! (d) Well done, name!

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