List of practice Questions

Three persons enter into a partnership by investing in the ratio of 9:8:1. After one year P double his investment and R puts another Rs.6000 to the initial investment. Now the ratio of investment is 9:8:2. What is total investment of P,Q and R after 2 years?
A transistor amplifier along with a tank circuit with positive feedback will act as
In p-type semiconductors
The number of six membered and five membered rings in Buckminster Fullerence respectively is
If the mass numbers of two nuclei are in the ratio 3: 2, then the ratio of their nuclear densities is :
Primary structure in a nucleic acid contains bases as G A T G C …..… The chain which is complementary to this chain is
The ratio of the total energy E of the electron to its kinetic energy K in hydrogen atom is
The property of the alkaline earth metals that increases with their atomic number is
1018 fissions per second is required for producing power of 300 MW in a nuclear power station. To increase the power output to 360 MW the additional number of fissions required per second is
RNA and DNA are chiral molecules, their chirality is due to the presence of
During $ẞ^{-}$ decay of a radioactive element there is an increase in its
If the momentum of an α-particle is half that of a proton, then the ratio between the wavelengths of their de-Broglie waves is
A hydrocarbon A (C4H8) on reaction with HCl gives a compound B (C4H9Cl) which on reaction with 1 mol of NH3 gives compound C (C4H10N). On reacting with NaNO2 and HCl followed by treatment with water, compound C yields an optically active compound D. The D is
Permanent hardness cannot be removed by
The method by which aniline cannot be prepared is

The product B is
If $θ_p$ is the polarizing angle for a glass plate of refractive index μ and critical angle $θ_c$, then
Which is the most suitable reagent for the following conversion ?
Chemical Reaction and Compound
In Young's double-slit experiment, two different light beams of wavelengths $λ_1$ and $λ_2$ produce interference pattern with band widths $β_1$ and $β_2$ respectively. If the ratio between $β_1$ and $β_2$ is 3:2, then the ratio between and is
An object is placed at 10 cm in front of a concave mirror. If the image is at 20 cm from the mirror on the same side of the object, then the magnification produced by the mirror is
The apparent depth of a needle lying in a water beaker is found to be 9 cm. If water is replaced by a liquid of refractive index 1.5, then the apparent depth of needle will be (μ of water is 4/3)
Which of the following is not true for oxidation ?
Chemical Reaction
A and C are
The reagent which can do the conversion CH3COOH → CH3 - CH2 - OH is
Chemical Equation
A, B and C respectively are