Questions

The lens which have atleast one inward curved surface is a concave lens. Concave ens is a diverging lens as it spreads out light rays that have been refracted through it.

A concave lens is thinner at its centre than at its edges.

Total value = 4 + 2 + 2 + 3 = 11.

Aestivation is summer sleep. Many organisms like the snails do not find it comfortable in summer. They withdraw and lead a life with reduced BMR (basic Metabolic Rate) in a state of  dormancy.

‘Rather’ is always followed by ‘Than’. Thus, the phrase ‘would rather have’ is grammatically correct. The correct formation would be, ‘I would rather have a noble enemy than a mean friend’.

GDP full form is Gross domestic product.

It is a measurement of a nation’s overall economic activity. 

GDP is the monetary value of all the finished goods and services produced within a country's borders in a specific time period.

Harappa cities followed the rectangular grid pattern where roads were straight and cut each other at right angle. But it may not be the case always.

Brick size was uniform in nearly every Harappan city from Sutkagendor in Baluchistan to Alamgirpurin Meerut, from Manda in Jammu Kashmir to Daimabad in Maharashtra.