Trignometry - Introduction

Number System- Introduction

Reproductive health in society can be improved by (i) Introduction of sex education is schools (ii) Increased medical assistance (iii) Awareness about contraception and STDs (iv) Equal opportunities to male and female child (v) Encouraging myths and misconceptions

Remarkable increase in rice production from 35 million tonnes to 89-5 million tonnes during 1960-2000 was mainly due to (a) Improved semi-dwarf varieties (c) Introduction semi-dwarf varieties (c) Increased use of chemical fertilizers (d) Cultivation of wild varieties

Statement-1: Ethyne is stronger acid than ethene. and Statement-2 Introduction of alkyl group activates benzene ring

Which is the oldest method for crop improvement ? (a) Hybridization (b) Selection (c) Mutation breeding (d) Introduction

Assertion:Malaria can be Contained with the introduction of larvicidal fish , Gambusia, in ponds, tanks and pubbles Reason : Gambusia is highly specific in devouring larvas of female anopheles mosquitoes

Assertion : Introduction of sex education in schools should be encouraged Reason : Sex education in schools will encourage children to believe in myths about sex related aspects.

Statement-1: In Friedel-Craft's acylation reaction multiple acyclation product is obtained and Statement-2 Introduction of alkyl group activates benzene ring.

A thin glass plate of thickness t and refractive index mu is inserted between screen and one of the slits in a young's experiment. If the intensity at the centre of the screen is I, what was the intensity at the same point prior to the introduction of the sheet.

A biconvex lens of focal length 40 cm is placed in front of an object at a distance of 20 cm . Now a slab of refractive index 4/3 is placed somewhere in between the lens and the object. The shift in the image formed after the introduction of slab equals (thickness of the slab is 2 mm)