Why is the Ozone important for mankind...? Mcqs

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Why is the Ozone important for mankind...?

(i) Protection from ultraviolet rays of sun
(ii) It releases oxygen in the air

(iii) It maintains temperature of the earth
(iv) It releases hydrogen in the atmosphere

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Bakelite is a:...?

(i) Conductor
(ii) Insulator

(iii) Semiconductor
(iv) None of these

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The "Law of Gravitation" was discovered by _____...?

(i) Isaac Newton
(ii) Thomas Aiva Edison

(iii) Hug Chavez
(iv) Guhlielmo Marconi

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The SI unit of energy is...?

(i) Kelvin
(ii) Joule

(iii) Temperature
(iv) Mole

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______ projections can be drawn taking the help of a source of light by projecting the image of a network of parallels...?

(i) Perspective
(ii) Conformal

(iii) Cylindrical
(iv) Conic

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When light passes from one medium to another, this phenomenon of change in its direction is called:...?

(i) Refraction
(ii) Reflection

(iii) Diffraction
(iv) Propagation

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Which planet in the solar system is farthest from the sun...?

(i) Mercury
(ii) Neptune

(iii) Venus
(iv) Mars

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When the object moves with the speed of light its mass would be...?

(i) equal to its rest mass
(ii) double of its rest mass

(iii) infinite
(iv) Zero Zero

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The blue colour of the clear sky is due to...?

(i) Refraction of light
(ii) Reflection of light

(iii) Diffraction of light
(iv) scattering of light

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Which from the following is true for "Sound"...?

(i) Sound cannot travel through a vacuum
(ii) Sound cannot travel through gases

(iii) Sound cannot travel through liquids
(iv) Sound cannot travel through solids

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