JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 283 · 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 writes in the console? (a) for (b) console.log() (c) if (d) alert()
2. 2.⚡ What does this code show?
   let name = "Kabir";
   console.log("Hi, " + name + "!"); (a) name (b) Hi, name! (c) Kabir (d) Hi, Kabir!
3. 3.⚡ A JavaScript file usually ends with which extension? (a) .css (b) .jpg (c) .js (d) .html
4. 4.⚡ Which JavaScript word runs code when true? (a) console.log() (b) let (c) if (d) for
5. 5.⚡ Which JavaScript word repeats code? (a) let (b) for (c) if (d) alert()
6. 6.⚡ What does this code show?
   let name = "Zoya";
   console.log("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) Hello, Zoya! (d) name
7. 7.⚡ What does this code show?
   let name = "Meera";
   alert("Welcome, " + name + "!"); (a) Meera (b) Welcome, Meera! (c) Welcome, name! (d) name
8. 8.⚡ Which word makes a new variable? (a) let (b) put (c) give (d) make
9. 9.⚡ What number does this code print?
   let a = 10;
   let b = 6;
   console.log(a * b);
10. 10.⚡ What number does this code print?
    let a = 46;
    let b = 23;
    console.log(a + b);
11. 11.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 9;
    console.log(x + y); (a) 49 (b) 13 (c) Error
12. 12.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) if (d) alert()
13. 13.⚡ 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
14. 14.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) Hi, Zoya! (d) name
15. 15.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) name (b) Hello, Kabir! (c) Kabir (d) Hello, name!
16. 16.⚡ Which tag holds JavaScript in a page? (a) <js> (b) <style> (c) <script> (d) <code>
17. 17.⚡ What number does this code print?
    let coins = 12;
    coins = coins + 14;
    coins = coins - 18;
    console.log(coins);
18. 18.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) on the title bar (d) in the console
19. 19.⚡ What does this code show?
    let name = "Aman";
    alert("Well done, " + name + "!"); (a) Well done, Aman! (b) Well done, name! (c) name (d) Aman
20. 20.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, Arjun! (b) name (c) Arjun (d) Hi, name!
21. 21.⚡ What does alert() show? (a) a pop-up box (b) a picture (c) a table (d) a new tab
22. 22.⚡ What number does this code print?
    let apples = 5;
    apples = apples + 5;
    apples = apples - 2;
    console.log(apples);
23. 23.⚡ What number does this code print?
    let a = 50;
    let b = 27;
    console.log(a - b);
24. 24.⚡ What does this code show?
    let name = "Meera";
    alert("Well done, " + name + "!"); (a) Well done, name! (b) Meera (c) name (d) Well done, Meera!
25. 25.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Well done, Zoya! (b) Well done, name! (c) Zoya (d) name
26. 26.⚡ Which JavaScript word shows a pop-up box? (a) for (b) if (c) console.log() (d) alert()
27. 27.⚡ What number does this code print?
    let a = 36;
    let b = 32;
    console.log(a - b);
28. 28.⚡ What number does this code print?
    let marks = 18;
    marks = marks + 17;
    marks = marks - 27;
    console.log(marks);
29. 29.⚡ What does JavaScript add to a web page? (a) the domain name (b) only colours (c) actions and changes (d) the page title
30. 30.⚡ What number does this code print?
    let score = 9;
    score = score + 20;
    score = score - 14;
    console.log(score);
31. 31.⚡ What does this code show?
    let name = "Zoya";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) Zoya (c) name (d) Hello, Zoya!
32. 32.⚡ What number does this code print?
    let a = 8;
    let b = 10;
    console.log(a + b);
33. 33.⚡ What number does this code print?
    let a = 2;
    let b = 10;
    console.log(a * b);
34. 34.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 2;
    console.log(x + y); (a) 72 (b) Error (c) 9
35. 35.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, name! (b) Riya (c) Welcome, Riya! (d) name
36. 36.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Kabir (b) name (c) Well done, name! (d) Well done, Kabir!
37. 37.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 6;
    console.log(x + y); (a) Error (b) 12 (c) 66
38. 38.⚡ What does this code show?
    let name = "Riya";
    console.log("Hello, " + name + "!"); (a) Hello, Riya! (b) Riya (c) name (d) Hello, name!
39. 39.⚡ What number does this code print?
    let a = 4;
    let b = 9;
    console.log(a * b);
40. 40.⚡ What number does this code print?
    let a = 30;
    let b = 22;
    console.log(a - b);

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