List of practice Questions

A Zener diode is connected to a battery and a load as shown below : The currents $I, I_z$ and $I_L$ are respectively

Given an $A.P$. whose terms are all positive integers. The sum of its first nine terms is greater than $200$ and less than $220$. If the second term in it is $12$, then its $4^{th}$ term is :

In the Victor-Meyer's test, the colour given by $1^{\circ}$, $2^{\circ}$and $3^{\circ}$ alcohols are respectively :

The angle between the lines whose direction cosines satisfy the equations $l + m + n = 0 $ and $ l^2= m^2 + n^2 $is

The minimum area of a triangle formed by any tangent to the ellipse $\frac{x^{2}}{16}+\frac{y^{2}}{81}=1$ and the co-ordinate axes is :

The variance of first $50$ even natural numbers is

An eight digit number divisible by 9 is to be formed using digits from 0 to 9 without repeating the digits. The number of ways in which this can be done is :

For the compounds $CH_3Cl, \, CH_3Br,\,CH_3I$ and $CH_3F,$ the correct order of increasing $C$-halogen bond length is :

Tischenko reaction is a modification of :

Two soap bubbles coalesce to form a single bubble. If $V$ is the subsequent change in volume of contained air and $S$ the change in total surface area, $T$ is the surface tension and $P$ atmospheric pressure, which of the following relation is correct ?

A few normal seedlings of tomato were kept in a dark room. After a few days they were found to have become white-coloured like albinos. Which of the following terms will you use to describe them?

A human female with Turner's syndrome:

A location with luxuriant growth of lichens on the trees indicates that the:

A man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind?

A marine cartilaginous fish that can produce electric current is:

A scrubber in the exhaust of a chemical industrial plant removes:

A species facing extremely high risk of extinction in the immediate future is called:

An aggregate fruit is one which develops from:

An analysis of chromosomal DNA using the southern hybridisation technique does not use:

An example of edible underground stem is:

An example of ex situ conservation is:

Anoxygenic photosynthesis is characteristic of:

Approximately seventy percent of carbon-dioxide absorbed by the blood will be transported to the lungs

Archaebacteria differ from eubacteria in: