List of practice Questions

The monomer of neoprene is $1, 3$-butadiene. Neoprene is highly inflammable.
The motion of a ceiling fan is rotational only. The motion of a rigid body which is pivoted or fixed in some way is rotation.
The motion of a particle under the central force is always confined to a plane. Angular momentum is always conserved in the motion under a central force.
The method of development of embryo sac from a single functional megaspore is termed as monosporic development. In monosporic (Polygonum) type of embryo sac development, usually the megaspore which is situated towards micropylar end remains functional.
The middle lamella is a layer made up of calcium pectate It holds the different neighbouring cells together
The middle piece is called as power house, of the sperm. The numerous mitochondria coiling around axial filament produce energy for the movement of the tail.
The moment of inertia of a rigid body depends only on the mass of the body, its shape and size. Moment of inertia $ I = MR^2$, where $M$ is the mass of the body and $R$ is the radius vector.
The mass of $\beta$-particles when they are emitted is higher than the mass of electrons obtained by other means. $\beta$-particle and electron, both are similar particles.
The maximum number of electrons in the shell with principal quantum number $n$ is equal to $2n^{2}$. Two electrons can have the same value of three quantum numbers $n,l$ and $m_{b}$ but must have the opposite spin quantum number.
The maximum oxidation state of chromium in its compounds is $+6$. Chromium has only six electrons in $ns$ and $(n - 1)d$ orbitals.
The melting and boiling points of the alkali metals are low. Alkali metals have weak metallic bonding.
The isobilateral leaf has equal number of stomata on both surfaces. The dorsiventral leaf has greater number of stomata on upper surface.
The law of independent assortment can be studied by means of dihybrid cross. The law of independent assortment is applicable only to linked genes.
The loss of water in its liquid phase from the leaves is called guttation. Guttation takes place at night only.
The lungs are situated in thoracic chamber which is anatomically an air-tight chamber. Such an arrangement is essential to avoid any change in pulmonary volume.
The flow is turbulent for Reynolds number greater than $2000$ Turbulence dissipates kinetic energy in the form of heat
: The fringe closest on either side of the central white fringe in case of interference pattern due to white light is red and the farthest appears blue. : The interference patterns due to different component colours of white light overlap.
The gases show ideal behaviour when the volume occupied is large so that the volume of the molecules can be neglected in comparison to it. The behaviour of the gas becomes more ideal when pressure is very low.
: The images formed by total internal reflections are much brighter than those formed by mirrors or lenses. : There is no loss of intensity in total internal reflection.
The endoplasmic reticulum which lacks ribosomes is called smooth endoplasmic reticulum $(SER)$ $SER$ is mainly involved in protein synthesis
The external factors that affect photosynthesis are number, size, age and orientation of leaves, mesophyll cells and chloroplasts and the amount of chlorophyll. The internal factors that affect photosynthesis are availability of sunlight, temperature, $CO_{2}$ concentration and water.
The female external genitalia includes mons pubis, labia majora and labia minora. The glandular tissue of each breast is divided into $5-10$ mammary lobes.
: The electrons in the conduction band have higher energy than those in the valence band of a semiconductor. : The conduction band is above the energy gap and valence band lies below the energy gap.
The endomembrane system includes endoplasmic reticulum $(ER)$, Golgi complex, lysosomes and vacuoles Mitochondria, chloroplast and peroxisomes are not the part of endomembrane system because their functions are not coordinated with the same
The chromoplasts contain fat soluble carotenoid pigments like carotene and xanthophylls etc These pigments give yellow, orange or red colour to some parts of the plant