List of practice Questions

A resonance air column of length $ 40\,\,cm $ resonates with a tuning fork of frequency $ 450\,\,Hz $ . Ignoring end correction, the velocity of sound in air will be:
A siren emitting sound of frequency 500 Hz is going away from a stationary listener with a speed of $ 50\,\,m/s $ , the frequency of sound to be heard directly from the siren is:
The peak value of alternating current is $ 5\sqrt{2} $ ampere. The mean square value of current will be:
In junction diode, the holes are because of:
The ortholpara directing group among the following is
The number of real solutions of the equation $x^2 - 3 |x| + 2 = 0$ is
The length of a simple pendulum executing simple harmonic motion is increased by $21\%$. The percentage increase in the time period of the pendulum of increased length is
The image formed by an objective of a compound microscope is
The electrostatic capacitance depends on:
The electric potential between a proton and an electron is r given by $V = V_0 in\frac{r}{r_0}, where r_0$ is a constant. Assuming Bohr's model to be applicable, write variation of rn with n, n being the principal quantum number.
The early stage human embryo distinctly possesses
The displacement of a particle varies according to the relation $x = 4(cos\, pt + sin \,pt).$ the amplitude of the particle is
Study of reptiles is called
Reverse bias applied to a junction diode
Quinine - an antimalarial drug is obtained from
Pollen grains are able to withstand extremes of temperature and dessication because their exine is composed of
The slope of plate characteristic and mutual characteristic curves of a triode valve is $0.02\, mA / V$ and $1 \,mA / V$. The amplification factor of triode valve is:
H-bond is strongest in:
Manganese is related to which block of the Periodic Table?
$ H_{2}O $ is liquid while $ H_{2}S $ is a gas due to:
One gram sample of $NH _{4} NO _{3}$ is decomposed in a bomb calorimeter. The temperature of the calorimeter increases by $6.12\, K$. The heat capacity of the system is $1.23\, kJ / g / deg$. What is the molar heat of decomposition for $NH _{4} NO _{3}$ ?
Life span of RBC is
Lampbrush chromosomes are seen in which typical stage:
Kupffer cells are found in
July 11 is observed as: