NEET ( EM ) STUDY MATERIALS - 05

01.    The gravitational force between two objects decreases by 36%, when the distance between them is increased by 4m. Find the original distance between them.

(a)     8m

(b)     12m

(c)     16 m

(d)     20 m

02.    A body at 50∘C50∘C cools in a surroundings maintained at 30∘C30∘C. Calculate the temperature of the body at which the rate of cooling is half that of the beginning in same surrounding.

(a)     30∘C

(b)     35∘C

(c)     45∘C

(d)     40∘C

03.    A tuning fork vibrating with a sonometer wire of length 20cm produces 5 beats per second. The beat frequency does not change if the length of the wire is changed to 21cm. The frequency of the tuning fork must be

(a)     200 Hz

(b)     210 Hz

(c)     205 Hz

(d)     215 Hz

04.    A wave is represented by an equation : Y=AcoskxsinωtY=Acoskxsin⁡ωt, then

(a)     it is a progressive wave with amplitude A

(b)     it is a progressive wave with amplitude A coskxcoskx

(c)     it is a stationary wave with amplitude A

(d)      it is stationary wave with amplitude A coskxcoskx

05.    Plane polarized light is passed through a polaroid. Now the polaroid is given one complete rotation about the direction of light propagation. When viewed through the polaroid, one of the following is observed.

(a)     the intensity of light gradually decreases to zero and then remains as zero

(b)     the intensity of light becomes maximum twice and zero twice

(c)     the intensity of light becomes maximum and stays maximum

(d)      intensity of light does not change

06.    The plates of a charged capacitor are connected by a conducting wire. The quantity of heat produced in the wire is

(a)     proportional to the capacitance of the capacitor

(b)     proportional to the square of the potential of the capacitor

(c)     proportional to the length of the wire

(d)      independent of the resistance of the wire

07.    A metre bridge is balanced with known resistance in the right gap and a metal wire in the left gap. If the metal wire is heated the balance point.

(a)     shifts towards left

(b)     shifts towards right

(c)     does not change

(d)     may shift towards left or right depending on the nature of the metal

08.    A charged particle is fired perpendicular to a uniform magnetic field. The field

(a)     changes the momentum and kinetic energy of the particle

(b)     changes the momentum but not the kinetic energy of the particle

(c)     changes the kinetic energy but not the momentum of the particle

(d)     neither changes the momentum nor the kinetic energy of the particle

09.    In the proton-carbon cycle of nuclear fusion carbon acts like a

(a)     moderator

(b)     activator

(c)     catalyst

(d)     controller

10.    All are true about mammary gland, except ?

a)      Is a modified sweat gland

b)      Extends from 2^nd to 6^th rib vertically

c)      Supplied by internal mammary artery

d)      Nipple is supplied by 6^th intercostal nerve