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Q 32 Two capper wires are of same length; one is twice as thlek as the other. The resistances of the wires are in the ratio of:
A. 1:2
C. 1:8
B.1:4
D. 1 : 16
Q33 The Internal reslatance is offered by the
A. Conductor
C. Circuil
B. Battery
D. External resistance
Q34 An electric bulb of 100 watt is connected to a supply of electrictly of 220 V . Resistance of the filament is
A. 4840
C. \( 100 \Omega \)
B. \( 22000 \Omega \)
D. 242 n
Q35 The substances which have a large number of free electrons and effer a low reslitance are called
A. Insulators
C. Inductors
B. Semiconductors
D. Conductors
Q. 36 Ohm' law Is enly applicable when
A. Temperature increases
C. Temperature is constant -
B. Temperature decreases
D. None of these
Q37 Five resistors are connected as shown in the diagram. The equivalent reslatance between A and B
A. \( 6-\mathrm{ohm} \)
C. 9 ohm
B. \( 12-\mathrm{ohm} \)
D. 15 ohm
Q38 If a source of emf Is traversed from positive to negative the potential change will be
A. Positive
C. Zero
B. Negative
D. Constant
Q39 The resistivity of a material of resistance \( R \), cross sectional area \( A \), and length \( L \) lig given by
\( \mathrm{A} . \mathrm{p}=\frac{\mathrm{AL}}{\mathrm{R}} \)
C. \( p= \) RAL
B. \( \rho=\frac{\mathrm{RA}}{\mathrm{L}} \).
D. \( p=\frac{L}{R A} \)
Q. 40 Kirchhoff's voltage law is based on law of conservation of
A. Momentum
C. Current
B. Charge
D. Energy
Q.41 Reciprocal of resistivity is called \( \qquad \) :
A. Resistance
C. Inductance
B. Conductivity
D. Flexibility
Q-42 If a wire of resistance 0.2 -ohm is doubled in lengit, its resistance breomin
A. \( 0.4-\mathrm{ehm} \)
C. 0.6 ohm
B. 0.8 -ohm
D. 1.0 ohm
Q43 Least current will flow through different resistors having same potential differeace
A. 25 -otm resistor
C. 18-ohm resistor
B. 10 -ohm resistor
D. 3 -ohm resistor
Q.44 A student earries out an experiment and plots the V-1 graph of three samples of nichrome wire infth resistances \( R_{1} R_{2} \) and \( R_{3} \) respectively. Which of the following is true?
A. \( \mathrm{R}_{1}=\mathrm{R}_{2}=\mathrm{R}_{3} \)
C. \( \mathrm{R}_{1}>\mathrm{R}_{1}>\mathrm{R}_{1} \)
B. \( \mathrm{R}_{3}>\mathrm{R}_{2}>\mathrm{R}_{1} \)
D. \( \mathrm{R}_{1}>\mathrm{R}_{1}>\mathrm{R}_{1} \)
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PHYSICS MDCAT EARLIER PREP (UNIT-7)