## Sunday, October 11, 2009

### IIT JEE Physics Final Revision Set 12

1.Column 1 gives certain situations in which a straight metallic wire of resistance R is used and
column 2 gives some resulting effects. Match column 1 itmes with column 2 items.

Column 1
a. A charged capacitor is connected to
the ends of the wire

b. The wire is moved perpendicular to
its length with a constant velocity in
a uniform magnetic field
perpendicular to the plane of motion

c. The wire is placed in a constant
electric field that has direction along
the length of the wire

d. A battery of constant emf is
connected to the ends of the wire

Column 2

p. A constant current flows through the wire
q. Thermal energy is generated in the wire
r. A constant potential difference develops
between the ends of the wire
s. Charges of constant magnitude appear
at the ends of the wire

(Source: 2007 paper 1)

2. A small object of uniform density rolls up a curved surface with an initial velocity v. It reaches up to a maximum height of 3v²/4g with respect to the initial position.The object is

(A) ring (B) solid sphere (C) hollow sphere (D) disc

3. In the experiment to determine the speed of sound using a resonance column, (A) prongs of the tuning fork are kept in a vertical plane (B) prongs of the tuning fork are kept in a horizontal plane (C) in one of the two resonance observed, the length of the resonating air column is close to the wavelength of sound in air (D) in one of the two resonance observed, the length of the resonating air column is close to half of the wavelength of sound in air

4. Positive and negative point charges of equal magnitude are kept at [0,0,a/2] and [0,0,-a/2], respectively. The work done by the electric field when another positive point charge is moved from (-a,0,0) to (0,a,0) is

(A) positive (B) negative (C) zero (D) depends on the path connecting the initial and final positions

5.

STATEMENT-1
Some dishes are kept on it. The cloth can be pulled out without dislodging the dishes from the table.

STATEMENT-2
For every action there is an equal and opposite reaction.

A) Statement-1 is True, Statement-2 is True; Statement
(B) Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-
(C) Statement-1 is True, Statement-2 is False
(D) Statement-1 is False, Statement-2 is True

Source: 2007 Physics paper 2