Physics Light from the star, Alpha Centauri, which is nearest to the earth after the sun, reaches the earth in 4.2 seconds 42 years 42 seconds 4.2 years 4.2 seconds 42 years 42 seconds 4.2 years ANSWER DOWNLOAD EXAMIANS APP
Physics When a ring of metal is heated what happens to its hole ? It expands or contracts according to its diameter It expands or contracts according to its coefficient of expansion Expands Contracts It expands or contracts according to its diameter It expands or contracts according to its coefficient of expansion Expands Contracts ANSWER DOWNLOAD EXAMIANS APP
Physics Holography is a technique of Recording a permanent, sharp two diimensional black and white or multicolour photograph Recording a permanent three dimensional photograph of a given single colour or a multicolour Recording a permanent three dimensional multicolour photograph Recording a permanent three dimensional black and white photograph Recording a permanent, sharp two diimensional black and white or multicolour photograph Recording a permanent three dimensional photograph of a given single colour or a multicolour Recording a permanent three dimensional multicolour photograph Recording a permanent three dimensional black and white photograph ANSWER DOWNLOAD EXAMIANS APP
Physics The ''Greenhouse effect' is mainly due to increase in atmospheric Nitrogen Sulphur dioxide Ozone Carbon dioxide Nitrogen Sulphur dioxide Ozone Carbon dioxide ANSWER DOWNLOAD EXAMIANS APP
Physics The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be: 1 T 8 T 4 T 2 T 1 T 8 T 4 T 2 T ANSWER DOWNLOAD EXAMIANS APP
Physics The focal length of a concave mirror with a radius of curvature of 20.0 cm is : 10 cm 15 cm 20 cm 5 cm 10 cm 15 cm 20 cm 5 cm ANSWER DOWNLOAD EXAMIANS APP
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