dpp no30

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VIBRANT ACADEFTY _--,,,',." (rndia) private

Single Ghoice Type

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r,imitea'11'!r;:f?l+"3:["tl?T"

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A straight bamboo pole of length L is to be carried horizontally across a corridor, which has a 90o turn as shown. What is the maximum posslble value of L, considering the constraints of the walls? Top view of coridor

3f

(A) 2.

m

(B) 9m

3J5m

(D) None of these

Two ideal gases X and Y are contained in a cylinder at constant temperature. The mass of the atoms of X is m and that of Y is 4m. Which one of the following is the correct value of the ratio

average translationalkinetic energy of the atom of Y ?

)1

3.

(B) 2

(c)

(D)

4

16

Apersonvibratestheendof astringsendingtransversewavesdownthestring.lfthepersonthen'doublesthe rate at whlch he vibrates the string, the speed of the waves

(A) Doubles and the wavelength doubled (B) Doubles while the wavelength is halved (C) ls unchanged while tle wavelength

is doubled

ls unchanged while thewavelength is halved

4.

A trolley runs frsm point P to Q along a track, as shown in

the figure. At psint Q, its potentialenergy is 50 kJ less than at point P. At point R the trolley has kinetic energy 5

Trolley

kJ. Between P and Q, the wprk done against friction is 1 0 kJ. What is the kinetic ene!'gy at point Q? (Trolley does not loose contact any where)

(A)35 kJ

(c)5s kJ

Subjectlve 5.

u)

45 kJ (D) None of these

:

A thin transparent plate of thickness 2 pm and refractive index n = 1.7 inserted in front of one of the slits in Young's double slit exBeriment, Another plate of a transparent material of thickness 1 pm and refractive index 1.55 is inserted ln frsnt of the other slit. lf the intensity at the center of the screen without the glass ptates was 10 lo, determlne x, it the intensity at the same point is x lo after the introduction of the glass plates. The wavelength of light used in vacuum is 6000 A. Assume that each glass plate transmits 100% of tight incident on it. Throughout the experiment (with and without the plates), the entire system is immersed in a liquid of index 1.25.

I

Mbrant Academy (I)

hrt L6. "A-14(A)'

Road No.1 , Indraprastha lndustrial Area, Kota (Raj.) Ph. 0744-242lylctr.

11I

waves of freqdency Two sources S., and S, of identical nadio antennas are placed 1 0 m apart and these radbte

of 30 MHz in ail directions. What is the intensity (in miliWm2) in the direction 0 =

q

3

in the direction 0 = 0 is 4

*tt * , if the intensity

miliwm2. Both intensities are measured atthe same far away distance from the

center of the two sources. Orientation of 0 is as shown in figure'

\ 2.

Interference pattern is formed on a screen by Young's double slits S., & S, illuminatgo o-V mono-chromatic maximum light of wavel'ength 1,. points P and P' are on the screen closest to and on either side of central 1", d and D, correct of in terms PP' is written lf maximum. central the at fourth that is one *rher" intensity

7.

q 3

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expression is PP'=:*O

\

rino the value of x.

nril 3.

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tatch the column

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The Golumn-l gives certain situations regarding a point object and its image formed by an optical instrument. of side Same given in Column-ll. lenses as or mirror convex and are concave possible opticat instruments below be principal should or both axis the above be either should object and principalaxis means both image ihe principalaxis as shown in figure. Same side of optical instrument means both image and object should in figure. be either left of the optical instrr.rment or bofir should be on right of the optical instrument as shown in column-ll' statements Match the statements in column-l with the conesponding

5.

principalaxis lens or minor

GolumnJl

Golumn-l

?R rq RJ'(

(o) lf point object and its image are on same side of principal axis and opposite sides of the optical instrument then the optical instrument is (B) lf point object and its image are on opposite side of principal axis and

(P) Concave minor 6.

(Q) Convexminor

same side of the optical instrument then the optical instrument is

(c) lf point object and its image are on same side of principal axis and

R!I.O'

(R) Concave lens

same side of the optical instrument then the optical instrument is lf point object and its image are on opposite side of principal axis and

(S) Convex lens

opposite side of the optical instrument then the optical instrument is

(I) Planoconvex

lens

Subje 7. q4

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Urb." Mbrant Acaderry (I) F

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LU.'A-14(A)'Road

No.1, lrdraprastha IndustrialArea, Kota (Raj.) Ph.0744*242346

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