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1.

252 can be expressed as a product of primes as :

A) 2 x 2 x 3 x 3 x 7

B) 2 x 2 x 2 x 3 x 7

C) 3 x 3 x 3 x 3 x 7

D) 2 x 3 x 3 x 3 x 7

2.

A, B and C start at the same time in the same direction to run around a circular stadium. A completes a round in 252 seconds, B in 308 seconds and C in 198 seconds, all starting at the same point. After what time will they meet again at the starting noint ?

A) 26 minutes 18 seconds

B) 42 minutes 36 seconds

C) 45 minutes

D) 46 minutes 12 seconds

3.

Four different electronic devices make a beep after every 30 minutes, 1 hour, 1.5 hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at:

A) 12 midnight

B) 3 a.m.

C) 6 a.m

D) 9 a.m.

4.

Six bells commence tolling together and toll at intervals of 2, 4, 6, 8, 10 and 12 seconds respectively. In 30 minutes, how many times do they toll together ?

A) 4

B) 10

C) 15

D) 16

5.

Find the least number which when divided by 16, 18, 20 and 25 leaves 4 as remainder in each case, but when divided by 7 leaves no remainder.

A) 17004

B) 18000

C) 18002

D) 18004

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