1
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
Let $R=\{(3,3),(6,6),(9,9),(12,12),(6,12)$, $(3,9),(3,12),(3,6)\}$ be a relation on the set $A=\{3,6,9,12\}$. The relation is :
A
reflexive and symmetric only
B
an equivalence relation
C
reflexive only
D
reflexive and transitive only
2
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
A lizard, at an initial distance of 21 cm behind an insect moves from rest with an acceleration of $2 \mathrm{~cm} / \mathrm{s}^2$ and pursues the insect which is crawling uniformly along a straight line at a speed of $20 \mathrm{~cm} / \mathrm{s}$. Then the lizard will catch the insect after :
A
20 s
B
1 s
C
21 s
D
24 s
3
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
In a full wave rectifier circuit operating from $$50$$ $$Hz$$ mains frequency, the fundamental frequency in the ripple would be
A
$$25$$ $$Hz$$
B
$$50$$ $$Hz$$
C
$$70.7$$ $$Hz$$
D
$$100$$ $$Hz$$
4
AIEEE 2005
MCQ (Single Correct Answer)
+4
-1
A nuclear transformation is denoted by $$X\left( {n,\alpha } \right)\matrix{ 7 \cr 3 \cr } Li.$$ Which of the following is the nucleus of element $$X$$ ?
A
$${}_5^{10}B$$
B
$${}^{12}{C_6}$$
C
$${}_4^{11}Be$$
D
$${}_5^9B$$
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