List of top Questions asked in NEET (UG)

Consider a drop of rain water having mass $1\,g$ falling from a height of $1\,km$. It hits the ground with a speed of $50\,m/s$. Take 'g' constant with a value ${10 \, m/s^2}$. The work done by the (i) gravitational force and the (ii) resistive force of air is :-

Photosensitive compound in human eye is made up of -

A cell organelle containing hydrolytic enzymes is -

The magnitude of the sum of the two vectors is equal to the difference of their magnitudes, the angle between the vectors is,

Three sound waves of equal amplitudes have frequencies $(n - 1), n, (n + 1)$. They superimpose to give beats. The number of beats produced per second will be

The hybridizations of atomic orbitals of nitrogen in $NO _{2}^{+}, NO _{3}^{-}$ and $NH _{4}^{+}$ respectively are

The term ecosystem was coined by :

The second overtone of an open organ pipe has the same frequency as the first overtone of a closed pipe $L$ metre long. The length of the open pipe will be

The rate of a first order reaction is $0.04 mol \, l^{-1} \, s^{-1}$ at 10 seconds and $0.03 \, mol \, l^{-1} \, s^{-1}$ at 20 seconds after initiation of the reaction. The half-life period of the reaction is :

The equivalent of a structural gene is -

Study the four statement (A-D) given below and select the two correct ones out of them : (A) Definition of biological species was given by Ernst Mayr. (B) Photoperiod does not affect reproduction in plants. (C) Binomial nomenclature system was given by R.H. Whittaker. (D) In unicellular organisms, reproduction is synonymous with growth. The two correct statements are

Pick out the correct statements : (a) Haemophilia is a sex-linked recessive disease. (b) Down's syndrome is due to aneuploidy. (c) Phenylketonuria is an autosomal recessive gene disorder. (d) Sickle cell anaemia is an X - linked recessive gene disorder.

Phytochrome is a -

Nomenclature is governed by certain universal rules. Which one of the following is contrary to the rules of nomenclature ?

Methanogens belong to -

Match items of Column I with the items of Column II and assign the correct code:

Two cars $P$ and $Q$ start from a point at the same time in a straight line and their positions are represented by $x _{ P }( t )= at + bt ^{2}$ and $x _{ Q }( t )=f t - t ^{2}$. At what time do the cars have the same velocity ?

Tricarpellary, syncarpous gynoecium is found in flowers of -

Three liquids of densities having the same value of surface tension $T$, rise to the same height in three identical capillaries. The angles of contact $\theta_{1}, \theta_{2}$ and $\theta_{3}$ obey-

The term 'polyadelphous' is related to -

The taq polymerase enzyme is obtained from

The suspension of slaked lime in water is known as

The standard petal of a papilionaceous corolla is also called

The highest DDT concentration in aquatic food chain shall occur in

The half-life of a radioactive substance is $30$ minutes. The time (in minutes) taken between $40\%$ decay and $85\%$ decay of the same radioactive substance is