Spike in carbon-14 levels in tree rings indicates a massive cosmic event - So what happened in the year 775?

Spike in carbon-14 levels in tree rings indicates a massive cosmic event - So what happened in the year 775?
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Big Ol’ Solar Flare + Polar Shift maybe?
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It is believed that carbon-14 in nature is slowly generated by the action of: w) protons on carbon-12 x) electrons on hydrogen y) cosmic rays on boron z) neutrons on nitrogen

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If P kg/m2 is the upward pressure on the slab of a plain concrete footing whose projection on either side of the wall is a cm, the depth of foundation D is given by (A) D = 0.00775 aP (B) D = 0.0775 aP (C) D = 0.07775 aP (D) D = 0.775 Pa

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If the bearing capacity of soil is 10 tonnes/cm2 and the projection of plain concrete footing from walls, is a cm, the depth D of footing is (A) D = 0.0775 a (B) D = 0.775 a (C) D = 0.775 a (D) D = 0.775 a2

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If a is the offset of concrete bed in cms, and d is the depth of concrete bed in cms, then (A) d = 0.445 a (B) d = 0.557 a (C) d = 0.775 a (D) None of these

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Mr. Sachin spent 20% of his monthly income on food and 15% on children’s education. 40% of the remaining he spent on entertainment and transport together and 30% on the medical. He is left with an amount of Rs.8, 775/- after all these expenditures. What is Mr. Sachin’s monthly income ?

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