J J Science Academy

Subject: Physics
Topic: 22. Current Electricity
SubTopic: 22.2 Ohms Law
Test Type: NEET
Marks:
Time:
Date:
1) The graph shows variation of current against applied potential difference, of a wire. The resistance of the wire is
Question Image
(1) $(3.3 k "," ")$
(2) $(6.6 k "," ")$
(3) $(1.5 k "," ")$
(4) $(9 k "," ")$
2) In which region of V-I graph of a specimen, is the resistance negative?
Question Image
(1) OA
(2) AB
(3) BC
(4) Both AB and BC
3) A metal rod is connected to a source of E.M.F. If it is compressed, so that its area of cross-section, increases by $(0.1 \%)$ , the current in it will
(1) decrease by $(0.1 \%)$ .
4) A wire, having a resistance of $(6 \Omega)$ per unit area per unit length and length of 3 m , is connected to a source of potential difference of 18 V . The current through the wire, if area of cross-section is $(6 cm^{2})$ , is
(1) 0.3 mA
(2) 1.2 mA
(3) 0.5 mA
(4) 0.6 mA
5) When a potential difference of V is applied across the ends of a conductor of length L , diameter of cross section $(D)$ , and resistivity $(\rho)$ , the current through it is $(I)$ . The potential difference per unit length of the conductor is
(1) $(\frac{4 I \rho}{\pi D^{2}})$
(2) $(\frac{I \rho}{\pi D^{2}})$
(3) $(\frac{\pi D^{2}}{4 I \rho})$
(4) $(\frac{\pi D^{2}}{I \rho})$
6) In an experiment, to study Ohm's law, a potential difference of 5 V is connected across a $(10 \Omega)$ resistance. An ammeter is connected in series with the E.M.F. source to measure the current and a voltmeter is connected across the resistance to measure the potential difference. The ammeter and the voltmeter readings can be i i = 5
(1) $(0.5 A, 5 V)$
(2) $(0.52 A, 5.2 V)$
(3) $(0.48 A, 4.5 V)$
(4) $(0.5 A, 1 V)$
7) Select the CORRECT statement.
(1) Both linear and non-linear resistances obey Ohm's law.
(2) Non-linear resistance obeys Ohm's law but not the linear resistance.
(3) Both linear and non-linear resistances do not obey Ohm's law.
(4) Only linear resistance obeys Ohm's law.
8) A graph of potential difference between two points on a current carrying conductor and the distance between them is
(1) parabola.
(2) curve.
(3) straight line.
(4) circle.