List of practice Questions

The de Broglie wavelength of a proton and α-particle are equal. The ratio of their velocities is :

According to Bohr atom model, in which of the following transitions will the frequency be maximum ?

The logic circuit shown above is equivalent to :

Two solids A and B of mass 1 kg and 2 kg respectively are moving with equal linear momentum. The ratio of their kinetic energies (K.E.)A : (K.E.)B will be A/1, so the value of A will be ______

A uniform thin bar of mass 6 kg and length 2.4 meter is bent to make an equilateral hexagon. The moment of inertia about an axis passing through the centre of mass and perpendicular to the plane of hexagon is __________ x 10\^{-1} kg m².

The root mean square speed of molecules of a given mass of a gas at 27°C and 1 atmosphere pressure is 200 m s⁻¹. The root mean square speed of molecules of the gas at 127°C and 2 atmosphere pressure is $ \dfrac{x}{\sqrt{3}} $ m s⁻¹. The value of $ x $ will be __________.

A point charge of +12 µC is at a distance 6 cm vertically above the centre of a square of side 12 cm. The magnitude of the electric flux through the square will be ________ × 10³ Nm²/C.

A cylindrical wire of radius 0.5 mm and conductivity $5 \times 10^7$ S/m is subjected to an electric field of 10 mV/m. The expected value of current in the wire will be $x^3 \pi$ mA. The value of $x$ is ______.

A series LCR circuit is designed to resonate at an angular frequency $ \omega_0 = 10^5 $ rad/s. The circuit draws 16 W power from a 120 V source at resonance. The value of resistance $ R $ in the circuit is _____ Ω.

Which one of the following is a competitive antagonist at benzodiazepine site of GABA- receptor gated chloride channel?

An electromagnetic wave of frequency 3 GHz enters a dielectric medium of relative electric permittivity 2.25 from vacuum. The wavelength of this wave in that medium will be ________ × 10⁻² cm.

A signal of 0.1 kW is transmitted in a cable. The attenuation of the cable is −5 dB per km and the cable length is 20 km. The power received at the receiver is $10^{-x}$ W. The value of $x$ is __________.

According to Bohr's atomic theory : (A) Kinetic energy of electron is $\propto Z^2 / n^2$. (B) The product of velocity (v) of electron and principal quantum number (n), 'vn' $\propto Z^2$. (C) Frequency of revolution of electron in an orbit is $\propto Z^2 / n^3$. (D) Coulombic force of attraction on the electron is $\propto Z^3 / n^4$. Choose the most appropriate answer :

Most suitable salt which can be used for efficient clotting of blood will be :

The correct set from the following in which both pairs are in correct order of melting point is :

Match List - I with List - II.

Assertion A : Hydrogen is the most abundant element in the Universe, but it is not the most abundant gas in the troposphere. Reason R : Hydrogen is the lightest element.

Match List - I with List - II.

The incorrect statement among the following is :

What is the correct order of the following elements with respect to their density ?

The calculated magnetic moments (spin only value) for species $[FeCl_4]^{2-}$, $[Co(C_2O_4)_3]^{3-}$ and $MnO_4^{2-}$ respectively are :

Given below are two statements : Statement I : The value of the parameter “Biochemical Oxygen Demand (BOD)” is important for survival of aquatic life. Statement II : The optimum value of BOD is 6.5 ppm. In the light of the above statements, choose the most appropriate answer from the options given below :

The diazonium salt of which of the following compounds will form a coloured dye on reaction with β-Naphthol in NaOH ?

Which one of the following compounds is non-aromatic ?

Which one of the following carbonyl compounds cannot be prepared by addition of water on an alkyne in the presence of HgSO₄ and H₂SO₄ ?