List of practice Questions

Stomach acid has a pH of approximately 2. Sour milk has a pH of 6. Stomach acid is
When the following 1.0 mol dm\(^{-3}\) aqueous solutions are arranged in order of increasing pH, which is the correct order?

I. Ammonium chloride
II. Ammonium ethanoate
III. Sodium ethanoate
Argon crystallises in fcc arrangement and the density of solid and liquid Ar is 1.59 g/cm\(^3\) and 1.42 g/cm\(^3\), respectively. The percentage of empty space in liquid Ar is
Tincture of iodine has antiseptic properties. This solution is made by dissolving :
Vinegar, used in kitchen is a dilute solution of :

Which of the following electronic configuration is not possible ?

Metal, which will displace hydrogen from dilute HCl is :
Beryllium gives a compound X with the following percentage composition: Be = 6.1%, N = 37.8%, Cl = 48%, H = 8.1%. The molecular weight of X is 148 g/mol and that of Be is 9 g/mol. The molecular formula of the compound is:
The bond dissociation energies of X2 , Y2 and XY are in the ratio of 1 : 0·5 : 1. ΔH for the formation of XY is – 200 kJ mol–1 . The bond dissociation energy of X2 will be
Which of the following has maximum number of atoms ?
The number of electrons in an element X is 6 and the number of neutron is 8. Which of the following is the correct representation of the element ?
The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion ?
Isotopes of an element have :
How many $\sigma$ bonds and $\pi$ bonds are present in
A body initially at rest and sliding along a frictionless track from a height h (as shown in the figure) just completes a vertical circle of diameter AB = D. The height h is equal to
A body initially at rest and sliding along a frictionless track
Which one of the following statements is incorrect ?
A spring of force constant K is cut into two pieces such that one piece is double the length of the other.Then the long piece will have a force constant of
The restoring force of a system of mass executing SHM is 4N. If its displacement is 4 cm then the force constant is
A particle performing SHM for maximum speed 50 m/s so and maximum acceleration = 100 m/s2 then time period of SHM ?
A organ pipe open on both ends in the nth harmonic is in resonance with a source of 1000 Hz. The length of pipe is 16.6 cm and speed of sound in air is 332 m/sec. Find the value of n.
A particle of mass \( m \) executes SHM with amplitude \( a \) and frequency \( v \). The average kinetic energy during its motion from the position of equilibrium to the end is
An electron falls from rest through a vertical distance h in a uniform and vertically upward directed electric field E. The direction of electric field is now reversed, keeping its magnitude the same. A proton is allowed to fall from rest in it through the same vertical distance h. The time of fall of the electron, in comparison to the time of fall of the proton is
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field \(\overrightarrow{E}\) . Due to the force q\(\overrightarrow{E}\), its velocity increases from 0 to 6 m/s in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between 0 to 3 seconds are respectively
If 2 bubble of radius r1 & r2 are combined then find radius of common surface
Two identical capillary tube are tilted in liquid with 45° and 60° from vertical find ratio of length of fluid in capillary