501: A table has three drawers. It is known that one of the drawers contains two silver coins, another contains two gold coins and the third one contains a silver coin and a gold coin. One of the drawers is opened at random and a coin is drawn. It is found to be a silver coin. What is the probability that the other coin in the drawer is a gold coin ?
(a) 0.25
(b) 1.00
(c) 0.50
(d) 0.60
502: A class starts after lunch at 1 p.m. and lasts till 3.52 p.m. Four periods are over during this interval. After every period, 4 minutes are allowed for going from one classroom to another. What is the exact duration of each period held?
(a) 42 minutes
(b) 41 minutes
(c) 40 minutes
(d) 39 minutes
503: Of the four landmarks in medical history given below, which one was the first to take place ?
(a) Organ transplant
(b) Bypass surgery
(c) Test-tube baby
(d) Plastic surgery
504: A person travelled a distance of 50 km in 8 hours. He covered a part of the distance on foot at the rate of 4 km per hour and a part on a bicycle at the rate of 10 km per hour. How much distance did he travel on foot?
(A) 20 km
(B) 10 km
(C) 40 km
(D) 30 km
505: Consider the following statements:
1. The Commission for Agricultural Costs and Prices recommends the Minimum support Prices for 32 crops.
2. The Union Ministry of Consumer Affairs, Food and Public Distribution has launched the national Food Security Mission.
Which of the statements given above is/are correct?
(A) 1 only
(B) 2 only
(C) Both 1 and 2
(D) Neither 1 nor 2