List of practice Questions

The measurement of the overall diversity for different ecosystems within an ecological region is

In cockroach, thermoreceptor sensillae are located on

Study the following statements and pick up the incorrect statements.
I. Oriented locomotor movement of an organism towards or away from the direction of light is called photokinesis.
II. The influence of light on non-directional movement of organisms is called phototaxis.
III. UV-B and UV-C rays are more harmful than UV-A rays.
IV. Photoperiod influences the migration of birds.

Statement-I: In articular cartilages, perichondrium is present.
Statement-II: Intervertebral discs contain fibrous cartilage.
Identify the correct option from the following:

Number of flagella in Giardia

Consider the following Statement-I: Alkali metals dissolve in liquid ammonia and form deep blue solutions.
Statement-II: The order of melting and boiling points of alkali metal halides follow the trend:
Fluoride< chloride< bromide< iodide.

In a hydraulic lift, if the radius of the smaller piston is $5 \ \text{cm}$, and the radius of the larger piston is $50 \ \text{cm}$, then the weight that the larger piston can support when a force of $250 \ \text{N}$ is applied to the smaller piston is

A cc camera is fabricated using a semiconducting material having a band gap of 3 eV. The wavelength of light it can detect is nearly

Identify the set containing purine and pyrimidine base of DNA respectively.

The correct statement about the product of the following reaction is:
\[ \text{CH}_3\text{CHO} \xrightarrow{(i)\ \text{C}_2\text{H}_5\text{MgBr}} \xrightarrow{(ii)\ \text{H}_2\text{O}} \text{product} \]

Identify the hydride which is not correctly matched with the example given in brackets.

What is 'Z' in the following reaction sequence? (Alcohol = colorless) $$ \mathrm{C_3H_6} \xrightarrow[\text{CCl}_4]{\mathrm{Br_2}} \mathrm{X} \xrightarrow[\Delta]{\text{i) KOH/alcohol} \\ \text{ii) NaNH}_2} \mathrm{Y} \xrightarrow[\mathrm{Hg}^{2+}, \mathrm{H}^+]{333\,K} \mathrm{Z} $$

A polymer sample contains 10 molecules each with molecular mass 5,000 and 5 molecules each with molecular mass 50,000. The number average molecular mass of the polymer sample is

If a wheel starting from rest is rotating with an angular acceleration of $\pi$ rad s$^{-2}$, then the number of rotations made by the wheel in the 6th second is
Identify the correct option from the following:

In a plane electromagnetic wave, the magnetic field is given by $\mathbf{B} = 3 \times 10^{-7} \sin (100 \pi x + 10^{12} t)\, T$, then the wavelength of the wave is (In the equation $x$ is in metre and $t$ is in seconds)

Consider the following statements:
Statement-I: If the intermolecular forces are stronger than thermal energy, the substance prefers to be in gaseous state.
Statement-II: Among all elements, the total number of elements available as gases at room temperature is 10.

If the equation for the velocity of a particle at time 't' is $v = at + \frac{b}{t+c}$, then the dimensions of a, b, c are respectively

If the longitudinal strain of a stretched wire is 0.2% and the Poisson's ratio of the material of the wire is 0.3, then the volume strain of the wire is

The number of P=O and P-O-P bonds present in the oxoacid of phosphorus, prepared by treating red P$_4$ with alkali, are respectively

The number of significant figures in the simplification of $ \frac{0.501}{0.05}(0.312-0.03) $ is

Two satellites A and B are revolving around the earth in orbits of heights $1.25R_E$ and $19.25R_E$ from the surface of earth respectively, where $R_E$ is the radius of the earth. The ratio of the orbital speeds of the satellites A and B is

At 298 K, 0.714 moles of liquid A is dissolved in 5.555 moles of liquid B. The vapour pressure of the resultant solution is 475 torr. The vapour pressure of pure liquid A at the same temperature is 280.7 torr. What is the vapour pressure of pure liquid B in torr?

Of the following, Bohr's atomic model is applicable to:

If the threshold wavelength of light for photoelectric emission to take place from a metal surface is $ 6250 \, \text{\AA} $, then the work function of the metal is (Planck's constant $ = 6.6 \times 10^{-34} \, \text{Js} $)

Which method is used to purify liquids having very high boiling points and liquids which decompose at or below their boiling point?