1ANYONE with Q3) ????????
ADDED Q2), Q3)
Q1)
radius of curved road on national high way is R and width of the road is ' b ' . the outer edge of the road is raised by a height of ' h ' with respect to inner edge so that the car with velocity ' v ' can pass safe over it... the value of h = ____
A) v2Rg B) v2bR C) vRgb D) v2bRg
Q2)
the direction of current in a iron - copper thermocouple is :
A) frm copper to iron in cold junction
B) frm iron to copper in hot junction
C) frm copper to iron in hot junction
D) no current will flow
Q3)
wavelength λ of the Kα line of characteristics X-ray spectra varies with atomic number Z as ( proportional to ) :
A) 1/√Z B) 1/Z2 C) √Z D) Z
for practise i don't have answers as this i downloaded online which had no answers
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20 Answers
1arrey koi to dekho....................bhaii...........................plzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz
1the focal length of objective of a compound microscope is f & its dist . frm eyepiece is l . the objct is placed at a dist u frm the objective. fr proper wrking of the microscope
a) l > u b) u > l c) f < l <2f d) l >2f
ans c
1a glass prism of u = 8/5 is immersed in a liq having u = 4/3. a ray of light incident at grazing angle on one face emerges at grazing angle on another face. the angle of prism is
a) 30° b) 60° c)37 ° d) none of these
13)we know from moseley's law that
√f=a(Z-b) [f=frequency]
√f=aZ-ab
therefore √f id directly proportional to Z(a,b are constants)
=> f is directly proportional to Z2
=> c/λ is directly proportional to Z2
=> λ is inversely proportional to Z2
So answer should be B.
1newton is printed on a paper & it is kept on a horizontal surface blow a cubical glass slab...................find minimum value of refractive index of glass slab fr which letters r nt visible frm ny of vertical faces of glass slab
a) √3 b)0.5 c)√2 d) 1
ans c
1rear view mirror of a vehicle is cylindrical having radus of curv. 10cm & length of arc of urved surface 10 cm ...............find the field of view in radians if it is assumed that eye of driver is at large distance frm the mirror
a) 0.5 b) 1.0 c) 2 d) 4
ans ... 2
1wavelength of K\alpha line is given by
\lambda =\frac{1216}{(Z-1)^{2}}\dot{A}
1i know some will do it by dimensional analysis since i did it like that [3]
BUT can u provide solution without using dimensions [1]
1I had earlier read it properly..and I understood it..")
1its a bit long..so i will post a useful link:
http://www.physics.iitm.ac.in/courses_files/courses/gplab03_odd/Thermocouple.htm
1jitna bhi mention tha question main sab post kiya hai [1]
1If YES..then answer will be :
Electric current flows from Fe to Cu THROUGH hot junction [1]
1Manmay...is the Q2 give n at the temp of inversion ???
