List of practice Questions

'Lac operon' in E. coli, is induced by
In mitochondria, cristae act as sites for
The sides of a rectangle are 6.01 m and 12 m. Taking significant figures into account the area of rectangle is
A disease caused by eating fish contaminated by industrial waste, containing mercury compounds, is called
Approximately, the temperature corresponding to 1 eV energy, is
In a boiling water reactor, the boiling water is used as a
The neutron was discovered by
A particle revolves round a circular path. The acceleration of the particle is inversely proportional to
A pure semiconductor has a/an
With an increase in temperature, the electrical conductivity of intrinsic semiconductor
A bulb contains one mole of hydrogen mixed with one mole of oxygen at temperature $T$. The ratio of $r.m.s.$ values of velocity of hydrogen molecules to that of oxygen molecules, is
The number of electrons and neutrons of an element is $18$ and $20$ respectively. Its mass number is
The number of electrons in $\left[{ }_{19} K ^{40}\right]^{-1}$ is
Which of the following glasses is the most heat resistant?
The formation of 2-butene as a major product by dehydration of 2-butanol is in accordance with
Which of the following is an alum?
In Wolff-Kishner reduction, the carbonyl group of aldehydes and ketones is converted into
Which of the following is a transition elements ?
In the following four elements,the ionization potential of which one is the highest ?
The last member of the family of inert gases is
The structure of white phosphorus is
Which of the following statements(s) is (are) correct?
During paddling of a bicycle, the force of friction exerted by the ground on the two wheels is such that it acts
Two bodies A and B have thermal emissivities of 0.01 and 0.81 respectively. The outer surface areas of the two bodies are the same. The two bodies emit total radiant power at the same rate. The wavelength $\lambda_B$ corresponding to maximum spectral radiancy in the radiation from B shifted from _the wavelength corresponding to maximum spectral radiancy in the radiation from A, by 1.00 pm. If the temperature of A is 5802 K.
A particle of mass $m$ is moving in a circular path of constant radius $r$ such that centripetal acceleration $a_{c}$ varying with time is $a_{c}=k^{2}\, r \,t^{2}$ where $k$ is a constant. What is the power delivered to the particle by the force acting on it?