2461: A and B start from the same point and in the same direction at 7 a.m. to walk around a rectangular field 400 m x 300 m. A and B walk at the rate of 3 km/hr and 2.5 km/hr respectively. How many times shall they cross each other if they continue to walk till 12 : 30 p.m?
(a) Not even once
(b) Once
(c) Twice
(d) Thrice
2464: Consider the following functionaries:
I. Cabinet Secretary
II. Chief Election Commissioner
III. Union Cabinet Ministers
IV. Chief Justice of India
Their correct sequence, in the Order of Precedence is
(a) III, IV, II, I
(b) IV, III, I, II
(c) IV, III, II, I
(d) III, IV, I, II
2465: Assertion (A) : A jet aircraft moving at Mach Number equal to 1 travels faster at an altitude of 15 km than while moving at mach number equal to 1 near the sea level.
Reason (R) : the velocity of sound depends on the temperature of the surrounding medium.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is not the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true