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```IIT-JEE-2007-Physics-Paper2

PAPER - II

________________________________________________________

19.    Speed of light is

(A)    the same in medium-1 and medium-2

(B)    larger in medium-1 than in medium-2

(C)    larger in mediu-2 and than in medium-1

(D)    different at b and d

20.    Column I described some situations in which a small object moves. Column II describes some characteristics of these motions. Match the situations in Column I with the characteristics in Column II.

Column I

Column II

(A)

The object moves n the
x-axis under a conservative force in such a way that its "speed" and "position" satisfy v = c1 √(c2- x2 ) , where c1 and c2 are positive constants.

(p)

The object exercises a simple harmonic motion.

(B)

The object moves on the x-axis in such a way that its velocity and its displacement from the origin satisfy v = -kx, where k is a positive constant.

(q)

The object does not change its direction.

(C)

The object is attached to one end of a mass-less spring of a given spring constant. The other end of the spring is attached to the ceiling of an elevator. Initially everything is at rest. The elevator starts going upwards with a constant acceleration a. The motion of the object is observed from the elevator during the period it maintains this accelerations.

(r)

The kinetic energy of the object keeps on decreasing.

(D)

The object is projected from the earth's surface vertically upwards with a speed 2√(GMe/Rer) , where, Me is the mass of the earth and Re is the radius of the earth. Neglect forces from objects other than the earth.

(s)

The object can change its direction only once.

21.    Two wires each carrying a steady current I are shown in four configurations in Column I. Some of the resulting effects are described in Column II. Match the statements in Column I with the statements in Column II.

Column I

Column II

(A)

Point P is situated midway between the wires.

(p)

The magnetic fields (B) at P due to the currents in the wires are in the same direction.

(B)

Point P is situated at the mid-point of the line joining the centers, of the circular wires, which have same radii.

(q)

The magnetic fields (B) at P due to the currents in the wires are in opposite directions.

(C)

Point P is situated at the mid-point of the line joining the centers of the circular wires, which have same radii.

(r)

There is no magnetic field at P.

(D)

Point P is situated at the common center of the wires.

(s)

The wires repel each other.

22.    Column I gives some devices and Column II gives some processes on which the functioning of these devices depend. Match the devices in Column I with the processes in Column II.

Column I

Column II

(A)

Bimetallic strip

(p)

Radiation from a hot body.

(B)

Steam engine

(q)

Energy conservation

(C)

Incandescent lamp

(r)

Melting

(D)

Electric fuse

(s)

Thermal expansion of solids

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```
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