All India Engineering / Architecture Entrance Examination (AIEEE)

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AIEEE 2008 Physics

Q. 13. A body of mass m = 3.513 kg is moving along the x-axis with a speed of 5.00 ms^-1. The magnitude of its momentum is recorded as

1. 17.56 kg ms^-1
2. 17.57 kg ms^-1
3. 17. 6 kg ms^-1
4. 17.565 kg ms^-1

Sol:

Q. 14. A working transistor with its three legs marked P, Q and R is tested using a multimeter. No conduction is found between P and Q. By connecting the common (negative) terminal of the multimeter to R and the other (positive) terminal to P or Q, some resistance is seen on the multimeter. Which of the following is true for the transistor?

1. It is a pnp transistor with R as emitter
2. It is an npn transistor with R as collector
3. It is an npn transistor with R as base
4. It is a pnp transistor with R as collector

Sol: Correct answer is (3)

Q. 15. A block of mass 0.50 kg is moving with a speed of 2.00 ms^-1 on a smooth surface. It strikes another mass of 1.00 kg and then they move together as a single body. The energy loss during the collision is

1. 0.67 J
2. 0.34 J
3. 0.16 J
4. 1.00 J

Sol:

Q. 16. A wave travelling along the x-axis is described by the equation If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then in appropriate units are

Sol:

Q. 17. Two coaxial solenoids are made by winding thin insulated wire over a pipe of cross sectional area A = 10 cm² and length = 20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is

Sol:

Q. 18. A capillary tube (A) is dipped in water. Another identical tube (B) is dipped in a soap-water solution. Which of the following shows the relative nature of the liquid columns in the two tubes?

Sol: Surface tension of water is more than soap solution.

Correct choice: (1)

Q. 19. A jar is filled with two non-mixing liquids 1 and 2 having densities , respectively. A solid ball, made of a material of density , is dropped in the jar. It comes to equilibrium in the position shown in the figure. Which of the following is true for ?

Sol:

Q. 20. Suppose an electron is attracted towards the origin by a force where 'k' is a constant and 'r is the distance of the electron from the origin. By applying Bohr model to this system, the radius of the nth orbital of the electron is found to be 'rn' and the kinetic energy of the electron to be 'T_n'. Then which of the following is true?

Sol:

Directions : Questions No. 91, 92 and 93 are based on the following paragraph.

Wave property of electrons implies that they will show diffraction effects. Davisson and Germer demonstrated this by diffracting electrons from crystals. The law governing the diffraction from a crystal is obtained by requiring that electron waves reflected from the planes of atoms in a crystal interfere constructively (see figure).

Q. 21. Electrons accelerated by potential V are diffracted from a crystal.

1. 500 V
2. 1000 V
3. 2000 V
4. 50 V

Sol:

Q. 22. If a strong diffraction peak is observed when electrons are incident at an angle 'i' from the normal to the crystal planes with distance 'd' between them (see figure), de Broglie wavelength of electrons can be calculated by the relationship (n is an integer)

Sol:

Q. 23. In an experiment, electrons are made to pass through a narrow slit of width 'd' comparable to their de Broglie wavelength. They are detected on a screen at a distance 'D' from the slit (see figure). Which of the following graphs can be expected to represent the number of electrons 'N' detected as a function of the detector position 'y' (y = 0 corresponds to the middle of the slit)?

Sol: After diffraction the electron beam will spread.

Correct answer (2)