1) The diffrence b/n the sum of angles of a plane triangle and the sum of angles of sph triangle is one second...when the triangle on the earth surface has an area of about ?(and should be in sq km )
2)Centring is not necessary when the scale of plane is less than
a) 1:1000
b) 1:2000
c)1:2400
d)noa
3)Three point problem can be solved by :
a) tracing paper method
b)graphical method
c)trial and error method
d)all of above
4)if the smallest division of vernier is longer than smallest divis of its primary scale, the vernier is known as :
a)direct vernier
b)double vernier
c)simple vernier
d)retrograde vernier