AIEEE 2011 Exam Questions

01. A magnetic needle lying parallel to a magnetic field requires W units of work to turn it through 600. The torque needed to maintain the needle in this position will be __ ?

01. √3W
02. W
03. 2W
04. √2W

02. The magnetic lines of force inside a bar magnet ?

01. are from north-pole to south-pole of the magnet
02. are from south-pole to north-pole of the magnet
03. do not exist
04. depend upon the area of cross-section of the bar magnet

03. A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the spring reads 49 N, when the lift is stationary. If the lift moves downward with an acceleration of 5m/s², the reading of the spring balance will be ?

01. 24 N
02. 49 N
03. 15 N
04. 74 N

04. The length of a wire of a potentiometer is 100 cm, and the e.m.f. of its standard cell is E volt. It is employed to measure the e.m.f of a battery whose internal resistance is 0.5W. If the balance point is obtained at 1 = 30cm from the positive end, the e.m.f. of the battery is __ ? (where " i " is the current in the potentiometer wire )

01. 30E ⁄100.5
02. 30E ⁄(100 0.5)
03. 30(E - 0.5i) ⁄100
04. 30E ⁄100

05. Consider telecommunication through optical fibres. Which of the following statements is not true?

01. Optical fibres can be of graded refractive index
02. Optical fibres are subjective to electromagnetic interference from outside
03. Optical fibres have extremely low transmission loss
04. Optical fibres may have homogeneous core with a suitable cladding.

06. The thermo e.m.f. of a thermo-couple is 25 V⁄ ⁰C at room temperature. A galvanometer of 40 ohm resistance, capable of detecting current as low as 10 ^-5 A, is connected with the thermo couple. The smallest temperature difference that can be detected by this sytem is __ ?

01. 16 ⁰C
02. 12 ⁰C
03. 8 ⁰C
04. 20 ⁰C

07. A strip of copper and another of germanium are cooled from room temperature to 80 K. The resistance of ?

01. copper strip decreases and that of germanium increases
02. copper strip increases and that of germanium decreases
03. each of these decreases
04. each of these increases

08. Curie temperature is the temperature above which ?

01. a paramagnetic material becomes diamagnetic
02. a ferromagnetic material becomes paramagnetic
03. a ferromagnetic material becomes diamagnetic
04. a paramagnetic material becomes ferromagnetic

09. The time period of a satellite of earth is 5 hours. If the separation between the earth and the satellite is increased to 4 times the previous value, the new time period will become ?

01. 10 hours
02. 80 hours
03. 40 hours
04. 20 hours

10. When a U²³⁸ nucleus originally at rest, decays by emitting an alpha particle having a speed ‘u’, the recoil speed of the residual nucleus is ?

01. 4u ⁄ 238
02. -4u ⁄234
03. 4u ⁄ 234
04. - 4u ⁄ 238

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