List of practice Questions

The significant result deduced from the Rutherford�s scattering experiment is that
The locus of the centre of the circle, which cuts the circle $x^{2}+y^{2}-20 x+4=0$ orthogonally and touches the line $x=2$, is
The area (in s units) of the triangle formed by the lines $x^{2}-3 x y+y^{2}=0$ and $x+y+1=0$, is
The shortest distance between the skew lines $\bar{r}=(i+2\bar{j}+3\bar{k})+t(i+3\bar{j}+2\bar{k}) $ and $\bar{r}=(4i+5\bar{j}+6\bar{k})+t(2i+3\bar{j}+\bar{k})$ is
If a line $l$ passes through $(k, 2 k),(3 k, 3 k)$ and $(3,1), k \neq 0$, then the distance from the origin to the line $l$ is
The most suitable metal for making electromagnets and transformer cores is
The acid strength of active methylene group in (I) $CH_3COCH_2COOC_2H_5$ (II) $CH_3COCH_2COCH_3$ (III) $C_2H_5OOCCH_2COOC_2H_5$ decreases as
Somaclones are prepared by
Set $ A $ and $ B $ have $ 3 $ and $ 6 $ elements respectively. What can be the minimum number of elements in $ A \cup B $ ?
Sand flies play significant role in spreading Kala-azar because they
Saheli, is an oral contraceptive pill that has very high contraceptive value with little side effects. It is because
Resolving power of reflecting microscope increases with
Plants can be made disease resistant through
Passive immunity is defined as immunity
Palade discovered which of the following cell organelles?
Osmosis is a type of
Objects less than $0.2\, �m$ in size cannot be seen under light microscope because
A convex lens has its radii of curvature equal. The focal length of the lens is $f$. If it is divided vertically into two identical plano-convex lenses by cutting it, then the focal length of the plano-convex lens is $(\mu=$ the refractive index of the material of the lens $)$
A thin converging lens of focal length $ f = 25\, cm $ forms the image of an object on a screen placed at a distance of $ 75\, cm $ from the lens. The screen is moved closer to the lens by a distance of $ 25\, cm $ . The distance through which the object has to be shifted, so that its image on the screen in sharp again is
Match the following and choose the correct combination from the options given.
Match column I with column II and select the correct option from the given codes.
Match Column I with Column II and choose the correct answer.
Censar mechanism of seed dispersal is found in
Treatment of chloroethane with a saturated solution of $AgCN$ gives ethyl isocyanide as the major product. Cyanide $\left( CN ^{-}\right)$is an ambident nucleophile.
Reaction of alcohols with $SOCl _{2}$ is catalysed by the presence of a tertiary amine $\left(R_{3} N \right)$. Tertiary amine promote the reaction by reacting with the by-product $HCl$.