RRB Group-D 1st October 2018-shift -3
For the following questions answer them individually
Which of the following statements is/are true/false?
A. An acid which is completely ionized into ions and produces large number of $$H^-$$ ions. For example $$HC1, H_2SO_4, HNO_3$$Â
B. An acid which is partially ionized in water and produces less number of $$H^-$$ ions. Form example $$CH_3COOH, H_2CO_3, H_2S0_3$$.
Who received the prestigious Florence Nightingale Award from the former President Pranab Mukherjee in 2017?
Let $$\alpha, \beta$$ be the roots of $$ax^2 + bx + c = 0$$; $$\gamma, \delta$$ be the roots of $$px^2 + qx + r = 0$$; & $$D_1, D_2$$ the respective discriminants of these equations. If, $$\alpha, \beta, \gamma, \delta$$ are in A.P. Then find the value of $$D_1:D_2$$
In triangle $$ABC$$, $$AD \bot BC$$ and $$AO$$ is the bisector of $$\angle{BAC}$$. If $$\angle{ABC} = 65°$$ and $$\angle{ACB} = 23\frac{1°}{2}$$, then $$\angle{DAO}$$ is ...............(in degrees)
In a class there were 18 boys and some girls. In a test the mean score obtained by the boys was 12 while that obtained by the girls was 14. lf the overall average was 13.1, what was the total number of students in the class?
