JavaScript Worksheet: Basics

HTML and CSS lesson 25: JavaScript basics · Set 170 · 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 number does this code print?
   let score = 7;
   score = score + 15;
   score = score - 7;
   console.log(score);
2. 2.⚡ Which word makes a new variable? (a) let (b) give (c) put (d) make
3. 3.⚡ What number does this code print?
   let a = 21;
   let b = 17;
   console.log(a - b);
4. 4.⚡ What does this code show?
   let name = "Riya";
   alert("Hi, " + name + "!"); (a) name (b) Riya (c) Hi, name! (d) Hi, Riya!
5. 5.⚡ What number does this code print?
   let a = 36;
   let b = 8;
   console.log(a + b);
6. 6.⚡ What number does this code print?
   let a = 7;
   let b = 10;
   console.log(a + b);
7. 7.⚡ What number does this code print?
   let a = 8;
   let b = 3;
   console.log(a * b);
8. 8.⚡ What does this code print? (Look at the quotes!)
   let x = "5";
   let y = 7;
   console.log(x + y); (a) Error (b) 12 (c) 57
9. 9.⚡ Which JavaScript word repeats code? (a) if (b) console.log() (c) let (d) for
10. 10.⚡ What does this code show?
    let name = "Riya";
    console.log("Welcome, " + name + "!"); (a) name (b) Welcome, Riya! (c) Riya (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) 56 (b) 11 (c) Error
12. 12.⚡ Which JavaScript word shows a pop-up box? (a) if (b) alert() (c) console.log() (d) for
13. 13.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 4;
    console.log(x + y); (a) Error (b) 6 (c) 24
14. 14.⚡ Where does console.log() show its output? (a) on the printer (b) on the title bar (c) in the console (d) in the address bar
15. 15.⚡ What does this code show?
    let name = "Aman";
    console.log("Welcome, " + name + "!"); (a) Aman (b) name (c) Welcome, name! (d) Welcome, Aman!
16. 16.⚡ A JavaScript file usually ends with which extension? (a) .js (b) .css (c) .jpg (d) .html
17. 17.⚡ What does alert() show? (a) a table (b) a picture (c) a new tab (d) a pop-up box
18. 18.⚡ What number does this code print?
    let coins = 21;
    coins = coins + 5;
    coins = coins - 11;
    console.log(coins);
19. 19.⚡ Which JavaScript word writes in the console? (a) for (b) alert() (c) console.log() (d) if
20. 20.⚡ What number does this code print?
    let score = 14;
    score = score + 4;
    score = score - 9;
    console.log(score);
21. 21.⚡ What number does this code print?
    let a = 26;
    let b = 8;
    console.log(a - b);
22. 22.⚡ Which tag holds JavaScript in a page? (a) <code> (b) <script> (c) <js> (d) <style>
23. 23.⚡ What does this code show?
    let name = "Riya";
    console.log("Hi, " + name + "!"); (a) name (b) Hi, Riya! (c) Hi, name! (d) Riya
24. 24.⚡ What does this code print? (Look at the quotes!)
    let x = "5";
    let y = 1;
    console.log(x + y); (a) 6 (b) 51 (c) Error
25. 25.⚡ What does this code show?
    let name = "Kabir";
    console.log("Hello, " + name + "!"); (a) Kabir (b) Hello, name! (c) Hello, Kabir! (d) name
26. 26.⚡ What does this code print? (Look at the quotes!)
    let x = "3";
    let y = 4;
    console.log(x + y); (a) 34 (b) Error (c) 7
27. 27.⚡ What does this code print? (Look at the quotes!)
    let x = "2";
    let y = 3;
    console.log(x + y); (a) Error (b) 23 (c) 5
28. 28.⚡ What number does this code print?
    let score = 5;
    score = score + 9;
    score = score - 2;
    console.log(score);
29. 29.⚡ What does this code print? (Look at the quotes!)
    let x = "6";
    let y = 3;
    console.log(x + y); (a) Error (b) 63 (c) 9
30. 30.⚡ What does this code show?
    let name = "Zoya";
    alert("Welcome, " + name + "!"); (a) Zoya (b) name (c) Welcome, name! (d) Welcome, Zoya!
31. 31.⚡ What number does this code print?
    let coins = 17;
    coins = coins + 18;
    coins = coins - 14;
    console.log(coins);
32. 32.⚡ Which JavaScript word runs code when true? (a) alert() (b) for (c) if (d) console.log()
33. 33.⚡ Which JavaScript word makes a new variable? (a) for (b) let (c) alert() (d) console.log()
34. 34.⚡ What number does this code print?
    let score = 7;
    score = score + 10;
    score = score - 2;
    console.log(score);
35. 35.⚡ What does this code print? (Look at the quotes!)
    let x = "4";
    let y = 3;
    console.log(x + y); (a) Error (b) 7 (c) 43
36. 36.⚡ What number does this code print?
    let a = 37;
    let b = 9;
    console.log(a + b);
37. 37.⚡ What does this code show?
    let name = "Kabir";
    console.log("Welcome, " + name + "!"); (a) Kabir (b) Welcome, Kabir! (c) Welcome, name! (d) name
38. 38.⚡ What number does this code print?
    let a = 2;
    let b = 6;
    console.log(a * b);
39. 39.⚡ 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
40. 40.⚡ What number does this code print?
    let score = 23;
    score = score + 3;
    score = score - 14;
    console.log(score);

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