# xdbs Interview Questions

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###### A hollow spherical metallic ball has an external diameter 6 cm and is ½ cm thick. The volume of metal used in the ball is : A. 46 2/3 cm³ B. 48 2/3 cm³ C. 49 2/3 cm³ D. 47 2/3 cm³
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###### A boat is being rowed away from a cliff 150m high. At the top of the cliff the angle of depression of the boat changes from 60º to 45º in 2 minutes. Find the speed of the boat. A. 1.9 km/hr B. 2.3 km/hr C. 3.8 km/hr D. 4.5 km/hr
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###### Set of first element of ordered pair forming a relation is called its A. Range B. Domain C. Relation in A D. Relation in B
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###### In how many different ways can the letters of the word ‘OPTICAL’ be arranged so that the vowels always come together? A. 720 B. 820 C. 920 D. 1020
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###### In a km race . A beats B by 28 metres or 7 seconds . Find A’s time over the course . A. 5 min .3 sec. B. 4 min .30 sec. C. 4 min .13 sec. D. 4 min .3 sec.
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###### Considering Cosine rule, cos C is equal to A. 2a² + 2b² + 2c²⁄2abc B. 2a + 2b - 2c⁄2ac C. a² + b² - c²⁄2ab D. a² - b² - c²⁄2bc
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###### In quadratic function, parabola will concave up if A. a = 0 B. b = 4 C. b = 3 D. a = 3
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