List of practice Questions

Calculate the ratio of $ rms $ speeds of oxygen gas molecules to that of hydrogen gas molecules kept at the same temperature.

Bag $I$ contains $3$ red and $4$ black balls, while another bag $II$ contains $5$ red and $6$ black balls. One ball is drawn at random from one of the bags and it is found to be black. The probability that it was drawn from bag $II$ is

Avalanche breakdown in a $ p $ - $ n $ junction diode is due to

Arrange the following in increasing order of their basic strength : $CH _{3} NH _{2}( I ),\left( CH _{3}\right)_{2} NH ( II ),\left( CH _{3}\right)_{3} N ( III )$, $C _{6} H _{5} CH _{2} NH _{2} (IV)$

Any digital circuit can be realised by repetitive use of only

An $n-p-n$ transistor is biased to work as an amplifier. Which of the following statements is false?

The synthesis of $3$-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and an alkyne. The bromoalkane and alkyne respectively are

The reagent(s) used for softening the temporary hardness of water is(are)

The ionisation isomer of $[Cr(H_2O )_4Cl(NO_2 )]Cl$ is

Assuming that Hund's rule is violated, the bond order and magnetic nature of the diatomic molecule $B_2$ is

Aleuroplasts in a cell stores

Which one of the following is not correct?

Cells divide and new cells are formed from pre-existing cells. This concept was given by

A typical nucleosome contains

Find the correct match.

Which of the following is not correctly paired?

Find the incorrect statement.

One of the following is not the characteristic feature of cyanobacteria.

Heterotrophic fungi can live as

A typical dicotyledonous embryo consists of

In the strict sense, animals that rely only on the heat from the environment rather than on metabolism to raise their body temperature are called as

A travelling wave is represented by the equation $y=\frac{1}{10} \sin (60 t+2 x)$, where $x$ and $y$ are in meter and $t$ is in second. This represents a wave 1. travelling with a velocity of $30\, ms ^{-1}$ 2. of frequency $\frac{30}{\pi} Hz$ 3. of wavelength $\pi$ meter 4. of amplitude $10\, cm$ 5. moving in the positive $x$-direction Pick out the correct statements from the above.

A thin uniform annular disc (see figure) of mass $M$ has outer radius $4R$ and inner radius $3R$. The work required to take a unit mass from point $P$ on its axis to infinity is

A student uses a simple pendulum of exactly $1 \,m$ length to determine $g$, the acceleration due to gravity. He uses a stopwatch with the least count of $1$ second for this and records $40$ seconds for $20$ oscillations. For this observation, which of the following statements is true ?

A square loop of wire, side length $ 10\,cm $ is placed at angle of $ 45^{\circ} $ with a magnetic field that changes uniformly from $ 0.1 \,T $ to zero in $ 0.7\, s $ . The induced current in the loopa (its resistance is $ 1\,\Omega $ ) is