JEE Advanced 2013 · Paper 1

The diameter of a cylinder is measured using a Vernier callipers with no zero error. It is found that the zero of the Vernier scale lies between 5.10 cm and 5.15 cm of the main scale. The Vernier scale has 50 divisions equivalent to 2.45 cm. The 24th division of the Vernier scale exactly coincides with one of the main scale divisions. The diameter of the cylinder is

1. A5.112 cm
2. B5.124 cm
3. C5.136 cm
4. D5.148 cm

A ray of light travelling in the direction ½(î + √3ĵ) is incident on a plane mirror. After reflection, it travels along the direction ½(î − √3ĵ). The angle of incidence is

1. A30°
2. B45°
3. C60°
4. D75°

In the Young’s double slit experiment using a monochromatic light of wavelength λ, the path difference (in terms of an integer n) corresponding to any point having half the peak intensity is

1. A(2n + 1)λ/2
2. B(2n + 1)λ/4
3. C(2n + 1)λ/8
4. D(2n + 1)λ/16

Two non-reactive monoatomic ideal gases have their atomic masses in the ratio 2 : 3. The ratio of their partial pressures, when enclosed in a vessel kept at a constant temperature, is 4 : 3. The ratio of their densities is

1. A1 : 4
2. B1 : 2
3. C6 : 9
4. D8 : 9

A pulse of light of duration 100 ns is absorbed completely by a small object initially at rest. Power of the pulse is 30 mW and the speed of light is 3 × 10⁸ ms⁻¹. The final momentum of the object is

1. A0.3 × 10⁻¹⁷ kg ms⁻¹
2. B1.0 × 10⁻¹⁷ kg ms⁻¹
3. C3.0 × 10⁻¹⁷ kg ms⁻¹
4. D9.0 × 10⁻¹⁷ kg ms⁻¹

A particle of mass m is projected from the ground with an initial speed u₀ at an angle α with the horizontal. At the highest point of its trajectory, it makes a completely inelastic collision with another identical particle, which was thrown vertically upward from the ground with the same initial speed u₀. The angle that the composite system makes with the horizontal immediately after the collision is

1. Aπ/4
2. Bπ/4 + α
3. Cπ/2 − α
4. Dπ/2

The work done on a particle of mass m by a force, K[x/(x² + y²)³ᐟ² î + y/(x² + y²)³ᐟ² ĵ] (K being a constant of appropriate dimensions), when the particle is taken from the point (a, 0) to the point (0, a) along a circular path of radius a about the origin in the x-y plane is

1. A2Kπ/a
2. BKπ/a
3. CKπ/2a
4. D0

One end of a horizontal thick copper wire of length 2L and radius 2R is welded to an end of another horizontal thin copper wire of length L and radius R. When the arrangement is stretched by applying forces at two ends, the ratio of the elongation in the thin wire to that in the thick wire is

1. A0.25
2. B0.50
3. C2.00
4. D4.00