List of practice Questions

The substance not likely to contain $CaCO _{3}$ is:

In curing cement plasters water is sprinkled from time to time. This helps in :

In an irreversible process taking place at constant $T$ and $P$ and in which only pressure-volume work is being done, the change in Gibbs free energy (dG) and change in entropy (dS), satisfy the criteria:

The internal energy change when a system goes from state $A$ to $B$ is $40 \,k J / mol$. If the system goes from $A$ to $B$ by a reversible path and returns to state $A$ by an irreversible path, what would be the net change in internal energy?

The de-Broglie wavelength of a tennis ball of mass $60\, g$ moving with a velocity of $10 m / s$ is approximately : (Planck's constant, $h=6.63 \times 10^{-34} \,Js$ )

Several blocks of magnesium are fixed to the bottom of a ship to :

When $U^{238}$ nucleus originally at rest, decays by emitting an alpha particle having a speed u, the recoil speed of the residual nucleus is

A circular disc $X$ of radius $R$ is made from an iron pole of thickness $t$, and another disc Y of radius $4R$ is made from an iron plate of thickness $\frac {t}{4}$. then the relation between the moment of inertia $I_X$ and $I_Y$ is

If the work done in blowing a bubble of volume $V$ is $W$, then the work done in blowing a soap bubble of volume $2\, V$ will be :

A metallic rod of length $l$ is placed normal to the magnetic field $B$ and revolved in a circular path about one of the ends with angular frequency $\omega$. The potential difference across the ends will be :

A magnetic needle suspended in a vertical plane at $30^{\circ}$ from the magnetic meridian makes an angle $45^{\circ}$ with the horizontal. What will be the true angle of dip ?

A force $F$ is given by $F=a t +b t^{2}$, where $t$ is time. What are the dimensions of $a$ and $b$ respectively ?

In hydrogen atom when an electron jumps from second to first orbit, the wavelength of line emitted is :

A rain drop of radius $0.3\, mm$ has a terminal velocity of $1\, m / s$ and the viscosity of $1\, m / s$ and the viscosity of air is $18 \times 10^{-5}$ poise. The viscous force on the drop is:

For a series LCR circuit, the phase difference between current and voltage at the condition of resonance will be :

The wavelength of maximum energy, released during an atomic explosion was $2.93 \times 10^{-10} m$. Given that the Wien's constant is $2.93 \times 10^{-3} m - K$, the maximum temperature attained must be of the order of :

The current gain of a transistor in common emitter mode is $49 .$ The change in collector current and emitter current corresponding to the change in base current by $5.0\, \mu A$ are :

In germanium crystal, the. forbidden energy gap in joule is :

The current gain of a transistor in common emitter mode is $49$. The change in collector current and emitter current corresponding to the change in base current by $5.0 \,\mu A, $ will be

How does the ionisation energy of 1st group elements vary ?

How many electrons are involved in the oxidationby $KMnO_4$ in basic medium ?

Which of the following is an example of ketohexose ?

A bomber plane is moving horizontally with a speed of $500 \,m/s$ and a bomb released from it, strikes the ground in $10 \,s$. Angle at which the bomb strikes the ground is: $ (g=10\,m/{{s}^{2}}) $

Two numbers are selected randomly from the set $S = \{1, 2, 3, 4, 5, 6\}$ without replacement. The probability that minimum of the two numbers is less than $4$, is

In the electrolytic cell, flow of electrons is from