The maximum resistance which can be made using four resistors each of resistance 1/2 Ω is

The sky appears dark to passengers flying at very high altitudes mainly because:

A cylindrical conductor of length ‘l’ and uniform area of cross section 'A' has resistance 'R'. The area of cross section of another conductor of same material and same resistance but of length '2l’ is

A diagram of traditional water harvesting system is given below:

The statement which defines the system and its parts is Piss

(a) This is an ideal setting of the Khadin system and A= Catchment area; B = Saline area & C= Shallow dugwell

(b) This is an ideal setting of the Shallow dugwell system and A= Catchment area; B= Saline area and C= Khadin

(c) This is an ideal setting of Catchment area and A=K hadin, B= Saline area and C= Shallow dugwell

(d) This is showing Saline area and A= Catchment area; B= Khadin and C= Shallow dugwell 1

OR

The major ill effect of mono culture practice in forests is on the

(a) biodiversity which faces large destruction

(b) local people whose basic needs can no longer be met from such forests

(c) industries

(d) forest department

Several factories were pouring their wastes in rivers A and B. Water samples were collected from these two rivers. It was observed that sample collected from river A was acidic while that of river B was basic. The factories located near A and B are

(a) Soaps and detergents factories near A and alcohol distillery near B.

(b) Soaps and detergents factories near B and alcohol distillery near A.

(c) Lead storage battery manufacturing factories near A and soaps and detergents factories near B.

(d) Lead storage battery manufacturing factories near $B$ and soaps and detergents factories near A.