IIT-JEE-2007-Physics-Paper2

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√(GM_e/R_er) , where, M_e 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.

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.

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