Central Board of Secondary Education conducts the All India Pre Medical Entrance Test for admission in UG medical courses .. here I am giving you question paper for All India Pre Medical Entrance Test

3. A 200 W sodium street lamp emits yellow light of wavelength 0.6 m. Assuming it to be 25% efficient in

converting electrical energy to light, the number of photons of yellow light it emits per second is.

(1) 1.5 × 1020 (2) 6 × 1018

(3) 62 × 1020 (4) 3×1019

Ans. (1)

5. When a mass is rotating in a plane about a fixed point, its angular momentum is directed along :

(1) a line perpendicular to the plane of rotation

(2) the line making an angle of 45° to the plane of rotation.

(3) the radius

(4) the tangent to the orbit.

Ans. (1)

6. An electric dipole of moment ´p´ is placed in an electric field of intensity ´E´. The dipole acquires a position

such that the axis of the dipole makes an angle with the direction of the field. Assuming that the potential

energy of the dipole to be zero when = 90º , the torque and the potential energy of the dipole will respectively

be :

(1) p E sin , – p E cos (2) p E sin , – 2 p E cos

(3) p E sin , 2 p Ecos (4) p E cos , – p Ecos

Ans. (1)

In a CE transistor amplifier, the audio signal voltage across the collector resistance of 2k is 2V. If the base

resistance is 1k and the current amplification of the transistor is 100, the input signal voltage is :

(1) 0.1 V (2) 1.0 V (3) 1mV (4) 10mV

Ans. (4)

When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of

glass . This implies that the liquid must have refractive index.

(1) equal to that of glass (2) less then one

(3) greater than that of glass (4) less then that of glass

Ans. (1)

In an electrical circuit R,L, C and an a.c. voltage source are all connected in series. When L is removed from

the circuit, the phase difference between the voltage the current in the circuit is /3. If instead, C is removed

from the circuit, the phase difference is again /3. The power factor of the circuit is :

(1) 1/2 (2) 2 / 1 (3) 1 (4) 2 / 3

Ans. (3)

Two persons of masses 55 kg and 65 kg respectively, are at the opposite ends of a boat. The length of the

boat is 3.0 m and weighs 100 kg. The 55 kg man walks up to the 65 kg man and sits with him. If the boat is

in still water the centre of mass of the system shifts by :

(1) 3.0 m (2) 2.3 m

(3) zero (4) 0.75 m

A mixture consists of two radioactive materials A1 and A2 with half lives of 20s and 10 s respectively. Initially

the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after :

(1) 60 s (2) 80 s (3) 20 s (4) 40 s

Ans. (4)

(AIPMT solved paper )