1. The smallest number, which when divided by 12 and 16 leaves remainder 5 and 9 respectively, is ?

55

41

39

29

Answer: 41

Explanation:


2. Three bells ring simultaneously at 11a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three ring together next is ?

2 p.m.

1 p.m.

1.15 p.m.

1.30 p.m.

Answer: 1 p.m.

Explanation:


3. The greatest number of four digits which when divided by 3, 5, 7, 9 leave remainders 1, 3, 5, 7 respectively is ?

9763

9764

9766

9765

Answer: 9763

Explanation:


4. Four bells ring at the intervals of 5, 6, 8 and 9 seconds. All the bells ring simulataneously at some time. They will again ring simultaneously after ?

6 minutes

12 minutes

18 minutes

24 minutes

Answer: 6 minutes

Explanation:


5. The greatest number of four digits which when divided by 12, 16 and 24 leave remainders 2, 6 and 14 respectively is ?

9974

9970

9807

9998

Answer: 9974

Explanation:


6. The traffic lights at three different road crossings change after 24 seconds, 36 seconds and 54 seconds respectively. If they all change simultaneously at 10 : 15 : 00 AM, then at what time will they again change simultaneously ?

10 : 16 : 54 AM

10 : 18 : 36 AM

10 : 17 : 02 AM

10 : 22 : 12 AM

Answer: 10 : 18 : 36 AM

Explanation:


7. 4 bells ring at intervals of 30 minutes, 1 hour, 1 and 1/2 hour and 1 hour 45 minutes respectively. All the bells ring simultaneously at 12 noon. They will again ring simultaneously at ?

12 mid night

3 a.m.

6 a.m.

9 a.m.

Answer: 9 a.m.

Explanation:


8. The smallest number, which when increased by 5 is divisible by each of 24,32, 36 and 564, is ?

869

859

4320

427

Answer: 859

Explanation:


9. The largest 4-digit number exactly divisible by each of 12, 15, 18 and 27 is ?

9690

9720

9930

9960

Answer: 9720

Explanation:


10. Three electronic devices make a beep after every 48 seconds, 72 seconds and 108 seconds respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is ?

10 : 07 : 12 hours

10 : 07 : 24 hours

10 : 07 : 36 hours

10 : 07 : 48 hours

Answer: 10 : 07 : 12 hours

Explanation: