List of practice Questions

Placenta in addition to connection with mother and foetus to ductless gland. It releases human gonadotropins.

One codon may code for more than one amino acid. A codon is degenerate and ambiguous.

$\left[ Ni ( CO )_{4}\right]$ is a diamagnetic complex. All the electrons in the complex are paired.

$NaOH$ cannot be stored in a vessel made of aluminium or zinc. A protective layer of oxide is formed on the surface of the metal.

Monoclinic sulphur is an example of monoclinic crystal system. For a monoclinic system, $a\ne b\ne c$ and $\alpha=\gamma=90^{\circ}, \beta=90^{\circ}$.

Magnetic field interacts with a moving charge and not with a stationary charge. A moving charge produces a magnetic field.

Interspecific competition is the only potent force in organic evolution. Unexceptionally two closely related species competing for the same resources cannot co-exist indefinitely.

In a pivot joint, rounded or pointed bone fits into a shallow depression in another bone. Pivot joints are present between the metacarpals and phalanges of the fingers.

Human heart is myogenic. The contraction is initiated by a specialized patch of modified heart muscles without requiring stimulation from nerve cells.

Conductivity of all electrolytes decreases on dilution. On dilution number of ions per unit volume decreases.

Chloroform is stored in dark coloured bottles. Chronic chloroform exposure may cause damage to liver and kidneys.

$CaF _{2}$ has been given the name fluorspar. Solid $CaF _{2}$ emits light when heated.

Boron always forms covalent bond. The small size of $B ^{3+}$ favours formation of covalent bond.

$Al _{2} O _{3}$ is converted to aluminium by reduction with carbon. Carbon (graphite) has greater affinity for oxygen than $Al$.

An LPG cylinder, containing $15\, kg$ butane at $27^{\circ} C$ and $10\, atm$ pressure, is leaking. After one day, its pressure decreased to 8 atm. The quantity of gas leaked is

In the reaction shown below, the major product(s) formed is/are

According to kinetic theory of gases, molecules of a gas behave like

A triply ionized beryllium ($Be^{+++}$) has the same orbital radius as the ground state of hydrogen. Then the quantum state $n$ of $Be^{3+}$ is

Two ideal batteries of $emf V _{1}$ and $V _{2}$ and three resistances $R _{1}, R _{2}$ and $R _{3}$ are connected as shown in the figure. The current in resistance $R _{2}$ would be zero if

Which one of the following is an example for biodegradable polyester?

Which one of the following is wrongly matched?

Which structures perform the function of mito- chondria in bacteria?

Williamson?? synthesis of preparing dimethyl ether is a/an

Which of the following feature(s) is/are common to both wind and water pollinated flowers? I. Pollen grains are long and ribbon-like II. Stigma is large and feathery III. The flowers are not colourful IV. The flowers do not produce nectar

Which of the following does not apply to ascomycetes?