23.
Which of the following issues was addressed during discussions in 11th safety conference held on 4th and 5th July 2013?

24.
Persons engaged in handling of stemming material activities should undergo routine stool examination after what intervals?

25.
For impact sensitivity test with discontinuous NG based explosives in India, Hammer test as per IS 6609 does not appear necessary with which explosives?

26.
This can be taken as one of the precautions as stipulated in DGMS Circular 12/199 in respect of reversing vehicles?

27.
As per circular 8/2014, a test is to be conducted for friction stabilizers in acidic water condition for 20 days during which no deterioration should occur on its assembly. What is the name of that test?