The figure shows input attenuator of a multimeter. The meter reads full-scale with $$12$$ $$V$$ at $$M$$ with the rage switch at position $$B$$ obtain full-scale deflection with the range switch position at $$D?$$

In a dual slope integrating type digital voltmeter the first integration is carried out for $$10$$ periods of the supply frequency of $$50Hz.$$ If the reference voltage used is $$2V,$$ the total conversion time for an input $$1$$ $$V$$ is _________ sec