List of practice Questions

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?

A wire of resistance $ R $ is bent in the form of a circular loop. Two points on the circle separated by a quarter circumference are connected to a battery of emf $ E $ and negligible internal resistance. The heat generated in the wire per second is:

At $ T $(K), hydrogen and oxygen gases are mixed in the ratio of $ 1:2 $ by mass in a closed vessel of volume $ V $ litres. If the total pressure of the gaseous mixture is $ p $ atm, the partial pressure of oxygen (in atm) is:

The potential energy of a satellite of mass $ m $ revolving around the earth at a height of $ R $ from the surface of the earth is:

Match the following

List-I (Molecule)	List-II (Dipole moment in D)
A) $ \text{HCCl} $	I) $ 1.85 \, \text{D} $
B) $ \text{NH}_3 $	II) $ 1.07 \, \text{D} $
C) $ \text{H}_2\text{O} $	III) $ 0.23 \, \text{D} $
D) $ \text{NF}_3 $	IV) $ 1.47 \, \text{D} $

If 11% of the power of a 200 W bulb is converted to visible radiation, then the intensity of the light at a distance of 100 cm from the bulb is

If the binding energy per nucleon of deuteron ($ ^1\mathrm{H}^2 $) is 1.15 MeV and an $\alpha$-particle has a binding energy of 7.1 MeV per nucleon, then the energy released per nucleon in the given reaction is \[ ^1\mathrm{H}^2 + ^1\mathrm{H}^2 \rightarrow ^2\mathrm{He}^4 + Q \]

Calculate the molality of a solution prepared by dissolving 10 g of NaCl ($ M = 58.5 \, \text{g/mol} $) in 500 g of water:

Choose the correct statements: ABA plays an important role in stratification Decapitation results in growth of lateral buds Kinetin naturally occurs in plants Vernalization promotes flowering by high temperature

List-I (Molecule)	List-II (Dipole moment in D)
A) \( \text{HCCl} \)	I) \( 1.85 \, \text{D} \)
B) \( \text{NH}_3 \)	II) \( 1.07 \, \text{D} \)
C) \( \text{H}_2\text{O} \)	III) \( 0.23 \, \text{D} \)
D) \( \text{NF}_3 \)	IV) \( 1.47 \, \text{D} \)