1
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
Let X be the set of all persons living in Delhi. The persons a an b in X are said to be related, if the difference in their ages is almost 5 hr. The relation is
A
an equivalence relation
B
reflexive and transitive but not symmetric
C
symmetric and transitive but not reflexive
D
reflexive and symmetric but not transitive
2
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
If A = {x$$\in$$ R : x2 + 6x $$-$$ 7 < 0} and B = {x$$\in$$ R : x2 + 9x + 14 < 0}, then which of the following is/are correct?

1. (A $$\cap$$ B) = ($$-$$2, 1)

2. (A $$-$$ B) = ($$-$$7, $$-$$2)

Select the correct answer using the code given below
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
3
NDA 2015 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
A, B, C and D are four sets such that A $$\cap$$ B = C $$\cap$$ D = $$\phi$$.

Consider the following

1. A $$\cup$$ C and B $$\cup$$ D are always disjoint.

2. A $$\cap$$ and B $$\cap$$ D are always disjoint.

Which of the above statements is/are correct?
A
Only 1
B
Only 2
C
Both 1 and 2
D
Neither 1 nor 2
4
NDA 2016 Paper 2
MCQ (Single Correct Answer)
+2.5
-0.83
In an examination, 70% students passed in Physics, 80% students passed in Chemistry, 75% students passed in Mathematics and 85% students passed in Biology, and x% students failed in all the four subjects. What is the minimum value of x?
A
10
B
12
C
15
D
None of these
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