Question

17. The end terminals that are dipped in the solution during electrolysis are called
(d) iron rods
(c) rods
(b) carbon rods
(d) plastic
(c) vegetable oil.
(d) gold
(c) zinc
(b) iron chloride solution
(a) electrodes
18. Which one of the following is good conductor of electricity?
(a) distilled water Oby tap water
19. Which metal is used for electroplating to make jewelleries?
(a) iron
(b) copper
20. In electroplating of copper which salt solution is used as a electrolyte?
(a) copper sulphate solution.
(c) sodium chloride solution.
(d) zinc sulphate solution
21. Angle of incidence is equal to the angle of reflection.
(d) never
(a) always
(b) sometimes.
(c) under special conditions
22. Night birds have cones than rods in their eyes.
(a) less.
(b) more.
(c) equal
(d) slightly more
23. The part of the eye which gives the colour to the eye is
(a) rods
(b) cones
(c) iris.
(d) pupil
24. The spot where no vision is possible is known as
(a) cornea.
(b) retina
(c) blind spot
(d) optic nerve
25. The lens in human eye is
(a) concave lens (b) convex lens (c) plane
(d) neither concave nor convex.
26. The ray which fall on the smooth surfaces is called
(a) reflected ray (b) incident ray
(c) normal
(d) refracted ray
27. Splitting of light into its colour is known as :
(a) dispersion of light (b) reflection of light (c) bending of light (d) scattering of light
28. The part of the eye where image is formed.
(a) pupil
(b) retina
(c) lens.
(d) iris
29. A person who developed the a system for visually challenged persons.
(a) Graham Bell (b) Mark Antony (c) Louis Braille (d) Helen A. Keller
30. A person Im in front of a plane mirror seems to be away from his image.
(a) 1 m.
(b) 2 m.
(c) 4 m.
(d) 2.5 m​

Answer 1

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