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Other Physics – Q&A

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sir i am a student of 8 class and i want to know that a toy car will travel farthest on polished marble surface or cemented surface.
In Progress...
An electrical source with internal resistance r is used to operate a lamp of resistance R. What fraction of the total power is delivered to the lamp?

R+rR
R−rR
RR+r
Rr
In Progress...
1 A convex mirror has a radius of 20 cm. An object is placed 30 cm in front of the mirror. Determine where the image will appear.

−45cm
−55cm
−6.5cm
−7.5cm
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The image of an object which is between the concave mirror's reflecting surface and its principal focus is.

in front of the mirror erect real and diminished
behind the mirror inverted real and diminished
in front of the mirror erect virtual and enlarged
behind the mirror erect virtual and enlarged
In Progress...
In an experiment with a concave mirror, the image of an optical pin which is 4 times its size was cast on on a screen 6m from the object pin. How far from the object pin should the mirror be placed?

8m
6m
3m
2m
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In practical experiment inloving the use of optical pins, parallax is reduced or removed if on slightly displacing one's eye from side to side.

the object and image are not coincident but move together in same directions
the object and image move in opposite directions relative to each other
the object and image are coincident and move together in the same direction
the object and image are coincident and remain stationary
In Progress...
In an experiment to determine the focal length of a convex lens, 1/u (cm−1) was plotted on horizontal and 1/v (cm−1) on the vertical axis, where u and v have their usual meaning. What is the physical significance of the reciprocal of the intercept on the horizontal axis?

linear magnification
focal length
object distance
image distance
In Progress...
Which of the following is not true about diverging lens.

the principal focus is positive
the principal focus is negative
they produce virtual images only
they form virtual, erect and smaller images of real object
In Progress...
A glass prism of refracting angle 60 degrees gives a minimum deviation of 47degrees. What is the refractive index of the glass?

1.61
1.20
1.52
1.41
In Progress...
Which of the following precautions is NOT applicable to experiment involving planoconvex lens?

planoconvex lens should have small focal length
parallax error should be avoided
the surface of the lens should be cleaned properly
the tip of the optical pin should be at the same level with the principal axis of the lens
In Progress...
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The latest assignment was ok. It didn't get 100% though, scored 88% on it which I was content with.
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