NEET 2018 Question Paper

Secondary xylem and phloem in dicot stem are produced by

Casparian strips occur in

Plants having little or no secondary growth are

All of the following are included in 'Ex-situ conservation' except

The experimental proof for semiconservative replication of DNA was first shown in a

Nitration of aniline in strong acidic medium also gives m-nitroaniline because

The compound A on treatment with Na gives B, and with PCl5 gives C. B and C react together to give diethyl ether. A, B and C are in the order

The compound C7H8 undergoes the following reactions : C7H8→3Cl2/∆A→Br2/FeB→Zn/HClC The product 'C' is

Magnesium reacts with an element (X) to form an ionic compound. If the ground state electronic configuration of (X) is 1s2 2s2 2p3, the simplest formula for this compound is

Iron exhibits bcc structure at room temperature. Above 900°C, it transforms to fcc structure. The ratio of density of iron at room temperature to that at 900°C (assuming molar mass and atomic radii of iron remains constant with temperature) is

The volume (V) of a monatomic gas varies with its temperature (T), as shown in the graph. The ratio of work done by the gas, to the heat absorbed by it, when it undergoes a change from state A to state B, is :-

Two wires are made of the same material and have the same volume. The first wire has cross-sectional area A and the second wire has cross-sectional area 3A. If the length of the first wire is increased by ∆l on applying a force F, how much force is needed to stretch the second wire by the same amount ?

A block of mass m is placed on a smooth inclined wedge ABC of inclination θ as shown in the figure. The wedge is given an acceleration 'a' towards the right. The relation between a and θ for the block to remain stationary on the wedge is :-

The kinetic energies of a planet in an elliptical orbit about the Sun, at positions A, B and C are KA, KB and KC respectively. AC is the major axis and SB is perpendicular to AC at the position of the Sun S as shown in the figure. Then

The electrostatic force between the metal plates of an isolated parallel plate capacitor C having a charge Q and area A, is :-