53) What will be the Ampere hour rating of a battery formed by connecting 3 parallel rows of 4 cells in series, if each cell is rated at 1.5 V, 2Ah?

54) In SI system of units, the unit of magnetic flux density is

55) The most commonly used metal in Resistance Temperature detector (RTD) is

56) What is the approximate line voltage in domestic 3 phase AC supply in India?

57) One card is drawn at random from a pack of 52 cards. What is the probability that the card drawn is a face card (jack, queen and king only)?