List of practice Questions

A beam of parallel light rays is incident on a solid transparent sphere of refractive index $ \mu $ . If a point image is produced just at the back of the sphere, what is the refractive index of the sphere?

Four conductors carrying $2.0\, A$ of current into or out of the page are shown in the diagram. $A$ path $C$ is indicated for the line integral $\oint B$. $d s$. Find the value of the integral for the path $C$.

In a container, $200 \,g$ of aluminum (specific heat $900\, J / kg K$ ) at $100^{\circ} C$ is mixed with $50\, g$ of water at $20^{\circ} C$, with the mixture thermally isolated. Find the entropy change of the aluminumwater system.

A $70 \,cm$ long sonometer wire is in unison with a tuning fork. If the length of the wire is decreased by $1.0\, cm$, it produces $4$ beats per second with the same tuning fork. The frequency of the tuning fork is

A straight wire of mass $300 \,g$ and length $ 2.5\,m $ carries a current of $ 3.5\,A $ . It is suspended in mid-air by a uniform horizontal magnetic field $B$. What is the magnitude of the magnetic field?

A solenoid of length $0.6 \,m$ has a radius of $1 \,cm$ and is made up of $600$ turns. It carries a current of $6 \,A$. What is the magnitude of the magnetic field inside the solenoid?

The bus moving with a speed of $42 \,km / h$ is brought to a stop by brakes after $6\, m$. If the same bus is moving at a speed of $90 \,km / h$, then the minimum stopping distance is

The Lenz's law is the consequence of the conservation of

The waves used for line-of-sight $(LOS)$ communication is

Which of the following processes will be most adversely affected if microorganisms are removed from a forest ecosystem?

Residual, persistent nucellus present in some seeds is known as

Which pair of plants placed in the family- Solanaceae?

$PAE$ stands for

Yeast is used for commercial production of

Microbe used as clot buster during myocardial infraction

$70 \,S $ ribosomes occur in

Atoms with identical atomic number but different atomic mass number are known as

The colour of transition metal compound is due to

What elements are present in $ f- $ block series?

Ethylene can be converted into alcohol by treatment of

In the formation of $ \pi - $ bond, the atomic orbitals overlap in such a way that

A liquid which decomposes at its boiling point can be purified by

Find wrong statement

What is the oxidation number of vanadium in $R b_{4} N a\left[H V_{10} O_{28}\right] ?$