1
AIEEE 2012
MCQ (Single Correct Answer)
+4
-1
Two electric bulbs marked $$25W$$ $$-$$ $$220$$ $$V$$ and $$100W$$ $$-$$ $$220V$$ are connected in series to a $$440$$ $$V$$ supply. Which of the bulbs will fuse?
A
Both
B
$$100$$ $$W$$
C
$$25$$ $$W$$
D
Neither
2
AIEEE 2011
MCQ (Single Correct Answer)
+4
-1
If a wire is stretched to make it $$0.1\% $$ longer, its resistance will:
A
increase by $$0.2\% $$
B
decrease by $$0.2\% $$
C
decrease by $$0.05\% $$
D
increase by $$0.05\% $$
3
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Let $$C$$ be the capacitance of a capacitor discharging through a resistor $$R.$$ Suppose $${t_1}$$ is the time taken for the energy stored in the capacitor to reduce to half its initial value and $${t_2}$$ is the time taken for the charge to reduce to one-fourth its initial value. Then the ratio $${t_1}/{t_2}$$ will be
A
$$1$$
B
$${1 \over 2}$$
C
$${1 \over 4}$$
D
$$2$$
4
AIEEE 2010
MCQ (Single Correct Answer)
+4
-1
Two conductors have the same resistance at $${0^ \circ }C$$ but their temperature coefficients of resistance are $${\alpha _1}$$ and $${\alpha _2}.$$ The respective temperature coefficients of their series and parallel combinations are nearly
A
$${{{\alpha _1} + {\alpha _2}} \over 2},\,{\alpha _1} + {\alpha _2}$$
B
$${\alpha _1} + {\alpha _2},\,{{{\alpha _1} + {\alpha _2}} \over 2}$$
C
$${\alpha _1} + {\alpha _2},\,{{{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}$$
D
$${{{\alpha _1} + {\alpha _2}} \over 2},\,{{{\alpha _1} + {\alpha _2}} \over 2}$$
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