List of practice Questions

The radius ratio of a substance is 0.32. The coordination number of the substance is

A single slit diffraction pattern is obtained on a screen using 600 nm light when the width of the central (principal) maximum is 0.30 mm. The width of the slit is reduced by 50%. and then illuminated by 450 nm light. Width, in mm, of the central maximum in the second case is;

Which of the following effects could not be observed for sound waves in air ?

A bi-metallic slab is made (refer figure) by fusing two material. The components have same thickness and lengths, but are of thermal conductivities $K_1$ and $K_2$. If the heat were to conduct across the faces $(T_1 > T_2)$, then effective thermal conductivity of the composite slab is

A prism with a refracting angle $30^{\circ}$, made of material of refractive index 1.732, has one of its faces silvered. A ray of light incident at a certain angle on the other face retraces the path after getting reflected at the silvered face. The angle of incidence is

As per Engler and Prantl's system of classification the family Musaceae is placed

Pouched mammals are known as

Transduction in bacteria was discovered by

A terminator codon which is called amber is

Which one among the following statements is not correct?

With reference to the external features of Cockroach, which among the following statements is not correct

Which of the following is pheromone?

Which of the following enzymes is present in animals like cow, buffaloes, etc. to digest compound like paper, cloth, etc.?

Two trains are moving towards each other with speeds of 20 m/s and 15 m/s relative to the ground. The first train sounds a whistle of frequency 600 Hz, the frequency of the whistle heard by a passenger in the second train before the train meeets is (the speed of sound in air is 340 m/s)

Power supplied to a particle of mass 2 kg varies with time as $ P=\frac{3{{t}^{2}}}{2}W. $ Here t is in second. If velocity of particle at $ t=0 $ is $ v=0, $ the velocity of particle at time $ t=2\,s $ will be

Which one of the following represents the correct ratio of the energy of electron in ground state of $H$ atom to that of the electron in the first excited state of $Li^{+}$ ?

A pulley fixed to the ceiling carries a string with blocks of masses $m$ and $3m$ attached to its ends. The masses of string and pulley are negligible. When the system is released, the acceleration of centre of mass will be

The charge flowing in a conductor varies with time as $ Q=at-b{{t}^{2}}, $ then the current changes at the rate of $ (-2b) $ falls to zero after $ T=\left( \frac{a}{2b} \right) $ (3) reaches a maximum and then decreases (4) will remain constant

A wooden block of mass $M$ resting on a rough horizontal surface is pulled with a force $F$ at an angle with the horizontal. If $ \mu $ is the coefficient of kinetic friction between the block and the surface, then acceleration of the block is

Which of the following is not considered as a mutagen

Which of the following is related to humoral immunity ?

Which of the following is the subaerial stem modification with long inter mode

Which of the following tissues is most abundant and forms most of the body parts?

Which one of the following cells is not a phagocytic cell

Which one of the following animal phyla does not possess a coelom