JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 57 · 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 this code print? (Look at the quotes!)
   let x = "4";
   let y = 5;
   console.log(x + y); (a) 9 (b) Error (c) 45
2. 2.⚡ What does this code show?
   let name = "Zoya";
   console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) Welcome, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 36;
   let b = 22;
   console.log(a - b);
4. 4.⚡ What does this code show?
   let name = "Arjun";
   console.log("Welcome, " + name + "!"); (a) name (b) Arjun (c) Welcome, Arjun! (d) Welcome, name!
5. 5.⚡ Which JavaScript word shows a pop-up box? (a) alert() (b) let (c) for (d) if
6. 6.⚡ What number does this code print?
   let a = 32;
   let b = 39;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 7;
   console.log(a + b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "3";
   let y = 3;
   console.log(x + y); (a) Error (b) 6 (c) 33
9. 9.⚡ What number does this code print?
   let a = 30;
   let b = 17;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 5;
    let b = 9;
    console.log(a * b);
11. 11.⚡ What number does this code print?
    let apples = 23;
    apples = apples + 18;
    apples = apples - 6;
    console.log(apples);
12. 12.⚡ What number does this code print?
    let marks = 7;
    marks = marks + 18;
    marks = marks - 14;
    console.log(marks);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    alert("Hi, " + name + "!"); (a) Zoya (b) Hi, name! (c) name (d) Hi, Zoya!
14. 14.⚡ What does this code show?
    let name = "Meera";
    console.log("Well done, " + name + "!"); (a) Meera (b) Well done, name! (c) Well done, Meera! (d) name
15. 15.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <js> (c) <script> (d) <code>
16. 16.⚡ What does this code show?
    let name = "Arjun";
    alert("Hi, " + name + "!"); (a) Hi, name! (b) Arjun (c) Hi, Arjun! (d) name
17. 17.⚡ Which JavaScript word makes a new variable? (a) alert() (b) for (c) let (d) console.log()
18. 18.⚡ What number does this code print?
    let a = 6;
    let b = 2;
    console.log(a * b);
19. 19.⚡ What number does this code print?
    let apples = 17;
    apples = apples + 17;
    apples = apples - 11;
    console.log(apples);
20. 20.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 6;
    console.log(x + y); (a) Error (b) 46 (c) 10
21. 21.⚡ 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
22. 22.⚡ What does JavaScript add to a web page? (a) the domain name (b) actions and changes (c) the page title (d) only colours
23. 23.⚡ What number does this code print?
    let runs = 29;
    runs = runs + 15;
    runs = runs - 12;
    console.log(runs);
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 3;
    console.log(x + y); (a) 8 (b) Error (c) 53
25. 25.⚡ What number does this code print?
    let a = 15;
    let b = 10;
    console.log(a - b);
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 9;
    console.log(x + y); (a) 19 (b) 10 (c) Error
27. 27.⚡ What does this code show?
    let name = "Riya";
    alert("Welcome, " + name + "!"); (a) Welcome, Riya! (b) Welcome, name! (c) Riya (d) name
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 6;
    console.log(x + y); (a) Error (b) 56 (c) 11
29. 29.⚡ Which JavaScript word runs code when true? (a) let (b) for (c) console.log() (d) if
30. 30.⚡ What number does this code print?
    let coins = 5;
    coins = coins + 12;
    coins = coins - 5;
    console.log(coins);
31. 31.⚡ Which JavaScript word writes in the console? (a) if (b) let (c) alert() (d) console.log()
32. 32.⚡ What does this code show?
    let name = "Kabir";
    alert("Hello, " + name + "!"); (a) Hello, Kabir! (b) Hello, name! (c) Kabir (d) name
33. 33.⚡ What number does this code print?
    let a = 4;
    let b = 3;
    console.log(a * b);
34. 34.⚡ What number does this code print?
    let a = 7;
    let b = 29;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 2;
    let b = 2;
    console.log(a * b);
36. 36.⚡ What does alert() show? (a) a new tab (b) a table (c) a picture (d) a pop-up box
37. 37.⚡ What does this code show?
    let name = "Arjun";
    alert("Hello, " + name + "!"); (a) Hello, name! (b) name (c) Hello, Arjun! (d) Arjun
38. 38.⚡ What number does this code print?
    let a = 19;
    let b = 17;
    console.log(a - b);
39. 39.⚡ What number does this code print?
    let a = 8;
    let b = 4;
    console.log(a * b);
40. 40.⚡ What does this code show?
    let name = "Meera";
    alert("Welcome, " + name + "!"); (a) name (b) Meera (c) Welcome, Meera! (d) Welcome, name!

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