JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 306 · 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 repeats code? (a) for (b) if (c) console.log() (d) let
2. 2.⚡ What does this code show?
   let name = "Riya";
   console.log("Hi, " + name + "!"); (a) Riya (b) Hi, Riya! (c) Hi, name! (d) name
3. 3.⚡ What number does this code print?
   let a = 36;
   let b = 2;
   console.log(a + b);
4. 4.⚡ What number does this code print?
   let runs = 11;
   runs = runs + 5;
   runs = runs - 2;
   console.log(runs);
5. 5.⚡ What does this code show?
   let name = "Riya";
   alert("Hello, " + name + "!"); (a) name (b) Riya (c) Hello, Riya! (d) Hello, name!
6. 6.⚡ Which JavaScript word shows a pop-up box? (a) console.log() (b) alert() (c) let (d) for
7. 7.⚡ Which tag holds JavaScript in a page? (a) <style> (b) <script> (c) <js> (d) <code>
8. 8.⚡ Which JavaScript word runs code when true? (a) console.log() (b) for (c) if (d) let
9. 9.⚡ What number does this code print?
   let a = 50;
   let b = 25;
   console.log(a + b);
10. 10.⚡ What number does this code print?
    let a = 7;
    let b = 13;
    console.log(a + b);
11. 11.⚡ What does alert() show? (a) a picture (b) a new tab (c) a pop-up box (d) a table
12. 12.⚡ What number does this code print?
    let a = 49;
    let b = 20;
    console.log(a + b);
13. 13.⚡ What does this code show?
    let name = "Zoya";
    console.log("Hello, " + name + "!"); (a) Zoya (b) Hello, Zoya! (c) name (d) Hello, name!
14. 14.⚡ Which JavaScript word writes in the console? (a) alert() (b) console.log() (c) if (d) let
15. 15.⚡ What number does this code print?
    let a = 38;
    let b = 23;
    console.log(a - b);
16. 16.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 3;
    console.log(x + y); (a) Error (b) 13 (c) 4
17. 17.⚡ What does this code print? (Look at the quotes!)
    let x = "1";
    let y = 1;
    console.log(x + y); (a) 11 (b) 2 (c) Error
18. 18.⚡ What number does this code print?
    let a = 37;
    let b = 34;
    console.log(a + b);
19. 19.⚡ Which word makes a new variable? (a) give (b) make (c) put (d) let
20. 20.⚡ What does this code show?
    let name = "Zoya";
    alert("Well done, " + name + "!"); (a) Zoya (b) Well done, Zoya! (c) name (d) Well done, name!
21. 21.⚡ What does this code show?
    let name = "Kabir";
    console.log("Well done, " + name + "!"); (a) Well done, Kabir! (b) Well done, name! (c) Kabir (d) name
22. 22.⚡ What does this code print? (Look at the quotes!)
    let x = "8";
    let y = 8;
    console.log(x + y); (a) 88 (b) 16 (c) Error
23. 23.⚡ What number does this code print?
    let score = 9;
    score = score + 15;
    score = score - 19;
    console.log(score);
24. 24.⚡ What number does this code print?
    let marks = 5;
    marks = marks + 10;
    marks = marks - 14;
    console.log(marks);
25. 25.⚡ What number does this code print?
    let a = 3;
    let b = 4;
    console.log(a * b);
26. 26.⚡ Where does console.log() show its output? (a) on the printer (b) in the address bar (c) in the console (d) on the title bar
27. 27.⚡ What does this code show?
    let name = "Zoya";
    console.log("Welcome, " + name + "!"); (a) Zoya (b) Welcome, Zoya! (c) name (d) Welcome, name!
28. 28.⚡ What does this code print? (Look at the quotes!)
    let x = "7";
    let y = 3;
    console.log(x + y); (a) Error (b) 10 (c) 73
29. 29.⚡ What number does this code print?
    let coins = 7;
    coins = coins + 4;
    coins = coins - 10;
    console.log(coins);
30. 30.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) Error (b) 51 (c) 6
31. 31.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 2;
    console.log(x + y); (a) 5 (b) 32 (c) Error
32. 32.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 9;
    console.log(x + y); (a) 14 (b) 59 (c) Error
33. 33.⚡ What number does this code print?
    let a = 51;
    let b = 26;
    console.log(a + b);
34. 34.⚡ What number does this code print?
    let a = 51;
    let b = 24;
    console.log(a + b);
35. 35.⚡ What number does this code print?
    let a = 12;
    let b = 5;
    console.log(a - b);
36. 36.⚡ What number does this code print?
    let a = 11;
    let b = 8;
    console.log(a * b);
37. 37.⚡ What number does this code print?
    let a = 6;
    let b = 21;
    console.log(a + b);
38. 38.⚡ What number does this code print?
    let a = 12;
    let b = 13;
    console.log(a + b);
39. 39.⚡ Which JavaScript word makes a new variable? (a) console.log() (b) let (c) alert() (d) if
40. 40.⚡ What does this code show?
    let name = "Arjun";
    alert("Welcome, " + name + "!"); (a) Welcome, Arjun! (b) Arjun (c) Welcome, name! (d) name

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