A solid with 6 equal square faces on all the surfaces is called …………………..
A) Side
B) Cube
C) Complete cube
D) Cuboid
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The water droplets condensed on the surfaces of window – panes, flowers, grass etc are known as ……………………..
Correct option is B) dew
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A transparent material is bounded by two surfaces of which one (or) both – surfaces are spherical is called
Correct option is D) lens
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A lens has ……………… curved surfaces.
Correct option is C) A and B
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A lens is bounded by two spherical surfaces, thin at the middle and thicker at the edges is called …………………..
B) bi concave lens
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The focal length of double concave lens kept in air with two spherical surfaces of radii R1 = 30 cm and R2 = 60 cm
Correct option is B) – 40 cm
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A double convex lens has two surfaces of equal radii “R” and refractive index n = 1.5. The focal length is …………………..
Correct option is B) +R
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The angle between the two rectangular plane surfaces of a prism is called the angle of the prism.
D) The angle between the incident ray and refracted ray is called angle of deviation.
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A solid cylinder and a solid cone have equal base and equal height. If the radius and the height be in the ratio of 4 : 3
Let the radius of both solids be r and their heights be h units, According to condition, \(\frac{r}{h}=\frac{4}{3}\\\therefore h=\frac{3r}{4}\) TSA of cylinder = \(2\pi r(r+h)\) TSA of cone = \(\pi r (r+l)\) On comparing the ratios, \(=\frac {2\pi r...
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The force which opposes the relative motion of two surfaces of the bodies which are in contact is called
B) frictional force
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Assertion: Ammonia is generaiiy excreted by diffusion across body surfaces or through gin surfaces (in fish) as ammonium ions. Reason: Ammonia is rea
Correct Answer - A Ammonia, as it is readily soluble, is generally excreted by diffusion across body surfaces or through gill surfaces (in fish) as ammonium ions. Kidneys do not play...
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