Examsnet
Unconfined exams practice
Home
Exams
Banking Entrance Exams
CUET Exam Papers
Defence Exams
Engineering Exams
Finance Entrance Exams
GATE Exam Practice
Insurance Exams
International Exams
JEE Exams
LAW Entrance Exams
MBA Entrance Exams
MCA Entrance Exams
Medical Entrance Exams
Other Entrance Exams
Police Exams
Public Service Commission (PSC)
RRB Entrance Exams
SSC Exams
State Govt Exams
Subjectwise Practice
Teacher Exams
SET Exams(State Eligibility Test)
UPSC Entrance Exams
Aptitude
Algebra and Higher Mathematics
Arithmetic
Commercial Mathematics
Data Based Mathematics
Geometry and Mensuration
Number System and Numeracy
Problem Solving
Board Exams
Andhra
Bihar
CBSE
Gujarat
Haryana
ICSE
Jammu and Kashmir
Karnataka
Kerala
Madhya Pradesh
Maharashtra
Odisha
Tamil Nadu
Telangana
Uttar Pradesh
English
Competitive English
Certifications
Technical
Cloud Tech Certifications
Security Tech Certifications
Management
IT Infrastructure
More
About
Careers
Contact Us
Our Apps
Privacy
Test Index
IIT JEE Advanced 2010 Paper 1
Show Para
Hide Para
Share question:
© examsnet.com
Question : 1
Total: 84
Incandescent bulbs are designed by keeping in mind that the resistance of their filament increases with the increase in temperature. If at room temperature, 100, 60 and 40 W bulbs have filament resistances
R
100
,
R
60
and
R
40
respectively, the relation between these resistances is
1
R
100
=
1
R
40
+
1
R
60
R
100
=
R
40
+
R
60
R
100
>
R
40
>
R
60
1
R
100
>
1
R
40
>
1
R
60
Validate
Solution:
The power of the bulb is
P =
V
2
R
Therefore,
100 =
V
2
R
100
⇒
1
R
100
=
100
V
2
where
R
100
is the resistance (at any temperature) corresponds to 100 W. Similarly,
60 =
V
2
R
60
⇒
1
R
60
=
60
V
2
and 40 =
V
2
R
40
⇒
1
R
40
=
40
V
2
From these equations, we get
P
100
>
P
60
>
P
40
⇒
1
R
100
>
1
R
40
>
1
R
60
© examsnet.com
Go to Question:
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
Next Question
Examsnet