List of practice Questions

Two heater wires, made of the same material and having the same length and the same radius, are first connected in series and then in parallel to a constant potential difference. If the rates of heat produced in the two cases are $H_s$ and $H_p$ respectively, then $H_s /H_p$ will be
To which type of barriers under innate immunity, do the saliva in the mouth and the tears from the eyes, belong?
Three point charges $+q,-2 q$ and $+q$ are placed at points $(x=0, y=a, z=0),(x=0, y=0, z=0)$ and $(x=a, y=0, z=0)$, respectively. The magnitude and direction of the electric dipole moment vector of this charge assembly are
Three charges $ {{Q}_{0}},-q $ and $ -q $ are placed at the vertices of an isosceles right angle triangle as in the figure. The net electrostatic potential energy is zero if $ {{Q}_{0}} $ is equal to
There is no division of cytoplasm after mitosis, then the condition will be
The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be
The term hot dilute soup was used by
The stem modified into leaf like structure is known as
The sequence of ionic mobility in aqueous solution is
The refractive index of glass is 1.520 for red light and 1.525 for blue light. Let $ \quad D_{1}$ and $ \quad D_{2}$ be angles of minimum deviation for red and blue light respectively in a prism of this glass, then,:
The probability that number selected at random from the number $1, 2, 3, 4, 5, 6, 7, 8, ..., 100$ is a prime, is
The potential energy of a 1 kg particle free to move along the x-axis is given by $V \left(x\right)=\left(\frac{x^{4}}{4}-\frac{x^{2}}{2}\right) J\cdot$ The total mechanical energy of the particle is 2 J. Then , the maximum speed (in m/s) is :
The plates of a parallel plate capacitor are not. exactly parallel. The surface charge density
The necessary condition for an interference by two sources of light is that
The magnifying power of a compound microscope increase with
The length of the seconds pendulum is decreased by $0.3\, cm$ when it is shifted to Chennai from London. If the acceleration due to gravity at London is $ 981\,cm/{{s}^{2}}, $ the acceleration due to gravity at Chennai is (assume $ {{n}^{2}}=10 $ )
The length of a given cylindrical wire is increased by 100%. Due to the consequent decrease in diameter the change in the resistance of the wire will be
The ionic mobility of alkali metal ions in aqueous solution is maximum for :
The integrated rate equation is $ kt=\log \,C_{0}-\log C_{t} $ . The straight line graph is obtained by plotting
The functional groups present in salol are
The flame colours of metal ions are due to
The excretory material of marine bony fish is
The electric flux through a closed surface area $S$ enclosing charge $Q$ is $ \phi $ . If the surface area is doubled, then the flux is
pH of $ HCl $ (conc. $ 0.1 \, mol/L $ ) is one. Compute the pH of $0.05\, mol/L$ solution of $ H_{2}SO_{4} $ .
What is the $pH$ at equivalence point in the titration of $0.1 \,M \,CH _{3} COOH$ and $0.1 \,M \,NaOH ?\left( K _{a}\right.$ for acetic acid is $1.8 \times 10^{-5}$ )