# AIEEE Physics 2008

### Physics 2008

_{1}and p

_{2}. respectively. A solid ball, made of a material of density p

_{3}is dropped in the jar. It comes to equilibrium in the position shown in the figure:

Which of the following is true for p_{1} , p_{2} and p_{3} ?

(1) p_{1} < p_{3} < p_{2}

(2) p_{3} < p_{1} < p_{2}

(3) p_{1} > p_{3} > p_{2}

_{1}< p

_{2}< p

_{3}

(1) It is an npn transistor with R as collector

(2) It is an npn transistor with R as base

(3) It is a pnp transistor with R as collector

(4) It is a pnp transistor with R as emitter

**Directions :**Questions No. 74 and 75 are based on the following paragraph. Consider a block of conducting material of resistively ‘p’ shown in the figure. Current ‘I’ enters at ‘A’ and leaves from ‘D’. We apply superposition principle to find voltage developed between ‘B’ and ‘C’. The calculation is done in the following steps:

(i) Take current ‘I’ entering from ‘A’ and assume it to spread over a hemispherical surface in the block.

(ii) Calculate field E® at distance ‘r’ from A by using Ohm’s law E = pj. Where j is the current per unit area at ‘r’.

(iii) From the ‘r’ dependence of E®. obtain the potential V® at r.

**Directions :**Questions No. 74 and 75 are based on the following paragraph. Consider a block of conducting material of resistively ‘p’ shown in the figure. Current ‘I’ enters at ‘A’ and leaves from ‘D’. We apply superposition principle to find voltage developed between ‘B’ and ‘C’. The calculation is done in the following steps:

(i) Take current ‘I’ entering from ‘A’ and assume it to spread over a hemispherical surface in the block.

(ii) Calculate field E® at distance ‘r’ from A by using Ohm’s law E = pj. Where j is the current per unit area at ‘r’.

(iii) From the ‘r’ dependence of E®. obtain the potential V® at r.

_{1}(t) after time ‘t’ and that of the second body by x

_{2}(t) after the same time interval. Which of the following graphs correctly describe (x

_{1}– x

_{2}) as a function of time ‘t’

Statement-1:

Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.

And

Statement-2

For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

(1) Statement-1 is true, Statement-2 is false

(2) Statement-1 is false, Statement-2 is true

(3) Statement-1 is true, Statement-2 is true; Statement-2 is correct explanation for Statement-1

(4) Statement-1 is true, Statement-2 is true; Statement-2 is not correct explanation for Statement-1

Statement-1:

For a mass M kept at the centre of a cube of side ‘a’ , the flux of gravitational field passing through its sides is 4 GM.

and

Statement-2:

If the direction of a field due to a point source is radial and its dependence on the distance ‘r’ from the source is given as , its flux through a closed surface

depends only on the strength of the source enclosed by the surface and not on the size or shape of the surface.

(1) Statement-1 is true, Statement-2 is false

(2) Statement-1 is false, Statement-2 is true

(3) Statement-1 is true, Statement-2 is true; Statement-2 is correct explanation for Statement-1

(4) Statement-1 is true, Statement-2 is true; Statement-2 is not correct explanation for Statement-1

2 = -10y + 1(x-y)

(1) a screw gauge provided on the microscope

(2) a vernier scale provided on the microscope

(3) a standard laboratory scale

(4) a meter scale provided on the microscope

(1) 2.5 x 10^{-7} T northward

(2) 2.5 x 10^{-7} T southward

(3) 5 x 10^{-6} T northward

(4) 5 x 10^{-6} T southward

_{2}) at a certain temperature is 460 ms

^{-1}. The speed of sound in helium (He) at the same temperature will be (assume both gases to be ideal)

(1) 330 ms^{-1}

(2) 460 ms^{-1}

(3) 500 ms^{-1}

(4) 650 ms^{-1}

Momentum = mass X velocity = 3.513X5.00 = 17.565

But significant figures allows only two digits after decimal point

=> momentum = 17.57

(1) M T^{-2} C^{-1}

(2) M L T^{-1}C^{-1}

(3) M T^{2} C^{-2 }

(4) M T^{-1} C^{-1}

^{-1}C

^{-1}=> Ans. (4)

_{1}= 3 and thinkness while the other one has dielectric constant k

_{2 }= 6 and thickness

(1) 20.25 pF

(2) 1.8 pF

(3) 45 pF

(4) 40.5 pF

(1) 2,000 J – 5,000 J

(2) 200 J – 500 J

(3) 2 x 10^{5} J – 3 x 10^{5} J

(4) 20,000 J – 50,000 J

Mass of the athlete will be around 40.100 kg

Hence, K. E. [2000 J, 5000 J]

89. Relative permittivity and permeability of a material are and , respectively. Which of the following values of these quantities are allowed for diamagnetic material?

_{viscous}= -kv

^{2}(k > 0). The terminal speed of the ball is

(1) 36 > x > 18

(2) 18 > x

(3) x > 54

(4) 54 > x > 36

^{|}> C

=> x > 54 => Ans. (3)

94. A wave travelling along the x-axis is described by the equation y(x, t) = 0.005 cos If the wavelength and the time period of the wave are 0.08 m and 2.0 s, respectively, then in appropriate units are

^{-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) 0.34 J

(2) 0.16 J

(3) 1.00 J

(4) 0.67 J

^{th}orbital of the electron is found to be ‘r

_{n}’ and the kinetic energy of the electron to be ‘T

_{n}’ Then which of the following is true ?

(1) 3.38 mm

(2) 3.32 mm

(3) 3.73 mm

(4) 3.67 mm

True Reading = Observed reading – Zero error

= 3.35 – (0.03)

= 3.38 mm

_{1}and contains ideal gas at pressure P

_{1}and temperature T

_{1}. The other chamber has volume V

_{2}and contains ideal gas at pressure P

_{2}and temperature T

_{2}. If the partition is removed without doing any work on the gas, the final equilibrium temperature of the gas in the container will be

^{2}and length =20 cm. If one of the solenoids has 300 turns and the other 400 turns, their mutual inductance is

In a soap solution, surface tension decreases hence is smaller than for

_{soap}< h

_{water}=. Ans. (4)

^{0}, V should be about (h = 6.6 10

^{-34}Js, m

_{e}= 9.1 10

^{-31}kg, e = 1.6 10

^{-19}C)

(1) 1000 V

(2) 2000 V

(3) 50 V

(4) 500 V

(2) d sin i = n

(3) 2d cos i = n

(4) 2d sin i = n

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) ?

(1)

104. A planet in a distant solar system is 10 times more massive than the earth and its radius is 10 times smaller. Given that the escape velocity from the earth is 11 km s-1 , the escape velocity from the surface of the planet would be

(1) 0.11 km s^{-1}

(2) 1.1 km s^{-1}

(3) 11 km s^{-1}

(4) 110 km s^{-1}

Ans.

_{CM}of the centre of mass of the rod is plotted against ‘n’, which of the following graphs best approximates the dependence of x

_{CM}on n ?