List of practice Questions

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 $R b_{4} N a\left[H V_{10} O_{28}\right] ?$
$ {{(1+i)}^{3}}+{{(1-i)}^{3}} $
Which of the following has higher bond angle?
First ionisation enthalpy of ${Al}$ is lower than that of ${Mg}$. This is because
Which one of the following kinds of animals are triploblastic?