List of top Questions asked in NEET (UG)- 2019

Xylem translocates:

The artificial sweetner stable at cooking temperature and does not provide calories is :

The value of $\gamma\left(=\frac{C_{p}}{C_{y}}\right)$ , for hydrogen, helium and another ideal diatomic gas $X$ (whose molecules are not rigid but have an additional vibrational mode), are respectively equal to :

Angular width of the central maxima in the Fraunhofer diffraction for $\lambda$ = 6000 � is $\theta_{0}$. When the same slit is illuminated by another monochromatic light, the angular width decreases by 30%. The wavelength of this light is,

Polyblend, a fine powder of recycled modified plastic, has proved to be a good material for:

The alkane that gives only one mono-chloro product on chlorination with $Cl_2$ in presence of diffused sunlight is :

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

Following table summarises the differences between a monocot root and a dicot root. Identify the incorrect differences and select the correct option.

For a reaction, activation energy E$_a$=0 and the rate constant at 200K is 1.6×10$^6$s$^{-1}$. The rate constant at 400K will be- [Given that gas constant] R= 8.314 J K$^{-1}$ mol$^{-1}$

It takes very long time for pineapple plants to produce flowers. Which combination of hormones can be applied to artificially induce flowering in pineapple plants throughout, the year to increase yield ?

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL ?

In total internal reflection when the angle of incidence is equal to the critical angle for the pair of media in contact, what will be angle of refraction ?

Under isothermal condition, a gas at 300 K expands from 0.1 L to 0.25 L against a constant externalpressureof2bar Theworkdonebythe gas i s : [Given that 1Lbar= 100J)

If the rate constant for a first order reaction is k, the time(t) required for the completion of 99% of the reaction is given by :

In which case change in entropy is negative ?

A straight conductor carrying current $i$ splits into two parts as shown in the figure. The radius of the circular loop is $R$. The total magnetic field at the centre $P$ at the loop is :

Bicarpellary ovary with obliquely placed septum is seen in :-

Which one of the following statements regarding post-fertilization development in flowering plants is incorrect ?

The given figure shows transport of two molecules $A$ and $B$ through three different modes of facilitated diffusion. Select the correct option regarding it.

Respiratory Quotient (RQ) value of tripalmitin is -

Following table summarises the comparisons between phyllodades and cladodes (cladophylls). Pick up the wrong differences and select the correct option,

What type of pollination takes place in Vallisneria?

Which of the following ecological pyramids is generally inverted ?

In pteridophytes, main plant body is a , which is into true roots, stem and leaves. Fill the blanks in above statement and select the correct option.

The number of sigma ($\sigma$)and pi ($\pi$) bonds in pent-2-en-4-yne is :