1
AIPMT 2009
+4
-1
The mean free path of electrons in a metal is 4 $$\times$$ 10$$-$$8 m. The electric field which can give on an average 2 eV energy to an electron in the metal will be in units V/m
A
$$5 \times {10^{ - 11}}$$
B
8 $$\times$$ 10$$-$$11
C
5 $$\times$$ 107
D
8 $$\times$$ 107
2
AIPMT 2009
+4
-1
A student measures the terminal potential difference (V) of a cell (of emf $$\varepsilon$$ and internal resistance r) as a function of the current (I) flowing through it. The slope, and intercept, of the graph between V and I, then respectively, equal
A
$$-$$ r and $$\varepsilon$$
B
r and $$-$$ $$\varepsilon$$
C
$$-$$ $$\varepsilon$$ and r
D
$$\varepsilon$$ and $$-$$ r
3
AIPMT 2008
+4
-1

In the circuit shown, the current through the 4 $$\Omega$$ resistor is 1 amp when the points P and M are connected to a d.c. voltage source. The potential difference betwen the points M and N is
A
0.5 volt
B
3.2 volt
C
1.5 volt
D
1.0 volt
4
AIPMT 2008
+4
-1
A wire of a certain material is stretched slowly by ten percent. Its new resistance and specific resistance become respectively
A
both remain the same
B
1.1 times, 1.1 times
C
1.2 times, 1.1 times
D
1.21 times, same
EXAM MAP
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