## Monday, October 12, 2009

### IIT JEE Physics Final Revision Set 31

1. An ideal gas is expanding such that PT2 = constant. The coefficient of volume expansion of the gas is

a. 1/T b. 2/T c. 3/T d. 4/T

2. Two beams of red and violet colours are made to pass separately through a prism (angle of the prism is 60º). In the position of minimum deviation, the angle of refraction will be

(A) 30º for both the colours (B) greater for the violet colour
(C) greater for the red colour (D) equal but not 30º for both the colours

3. Which one of following statements is Wrong in the context of X-rays generated from a X- ray tube ?
(A) Wavelength of characteristic X-rays decreases when the atomic number of the target increases
(B) Cut-off wavelength of the continuous X-rays depends on the atomic number of the target
(C) Intensity of the characteristic X-rays depends on the electrical power given to the X-ray tube
(D) Cut-off wavelength of the continuous X-rays depends on the energy of the electrons in the X-ray tube

4. In a Young’s double slit experiment, the separation between the two slits is d and the wavelength of the light is λ. The intensity of light falling on slit 1 is four times the intensity of light falling on slit 2. Choose the correct choice(s).

(A) If d = λ, the screen will contain only one maximum
(B) If λ < d < 2λ, at least one more maximum (besides the central maximum) will be observed on the
screen
(C) If the intensity of light falling on slit 1 is reduced so that it becomes equal to that of slit 2, the
intensities of the observed dark and bright fringes will increase
(D) If the intensity of light falling on slit 2 is increased so that it becomes equal to that of slit 1, the intensities of the observed dark and bright fringes will increase

5.STATEMENT – 1
An astronaut in an orbiting space station above the Earth experiences weightlessness.
and
STATEMENT – 2
An object moving around the Earth under the influence of Earth’s gravitational force is in a state of
‘free-fall’.
(A) STATEMENT – 1 is True, STATEMENT- 2 is True; STATEMENT -2 is a correct explanation for
STATEMENT -1
(B) STATEMENT – 1 is True, STATEMENT- 2 is True; STATEMENT -2 is NOT a correct explanation
for STATEMENT -1
(C) STATEMENT-1 is True, STATEMENT-2 is False
(D) STATEMENT-1 is False, STATEMENT-2 is True

Source JEE 2008 Paper 1