A 500 W heating unit is designed to operate from a 115 volt line. If the line voltage drops to 110 volt, the percentage drop in heat output will be
|
(a) 10.20% |
(b) 8.1% |
(c) 8.6% |
(d) 7.6% |
(c) 8.6%
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A tall man of height 6 feet, want to see his full image. Then required minimum length of the mirror will be-
A film projector magnifies a 100 cm2 film strip on a screen. If the linear magnification is 4, the area of magnified film on the screen is
|
(a) 1600 cm2 |
(b) 400 cm2 |
(c) 800 cm2 |
(d) 200 cm2 |
The relation between the linear magnification m, the object distance u and the focal length f is
|
(a) |
(b) |
(c) |
(d) |
Which of the adjoining graphs represents ohmic resistance
(a)
|
(b)
|
(c)
|
(d)
|
