3976: There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?
(a) Zero
(b) 1/2
(c) 1/6
(d) 5/6
3977: Assertion (A) :
Large cold storage plants use ammonia as refrigerant while domestic refrigerators use chlorofluorocarbons.
Reason (R) :
Ammonia can be liquefied at ambient temperatures at low pressures.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
3978: In the map given below, three out of the four places marked indicates places where a thermal power station is located :
The place where there is no thermal power station is marked
(a) 1
(b) 2
(c) 3
(d) 4
3979: With reference to the National Rehabilitation and Resettlement Policy, 2007, consider the following statements :
1. This policy is applicable only to the persons affected by the acquisition of land for projects and not to the involuntary displacement due to any other reason.
2. This policy has been formulated by the Ministry of Social Justice and Empowerment.
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
3980: Which of the following can be threats to the biodiversity of a geographical area?
1. Global warming
2. Fragmentation of habitat
3. Invasion of alien species
4. Promotion of vegetarianism
Select the correct answer using the codes given below :
(a) 1, 2 and 3 only
(b) 2 and 3 only
(c) 1 and 4 only
(d) 1, 2, 3 and 4