List of practice Questions

A force $F = 75\, N$ is applied on a block of mass $5\, kg$ along the fixed smooth incline as shown in figure. Here gravitational acceleration $g = 10m/s^2$. The acceleration of the block is

A particle enters uniform constant magnetic field region with its initial velocity parallel to the field direction. Which of the following statements about its velocity is correct? (neglect the effects of other fields)

A cell has terminal voltage $2\, V$ in open circuit and internal resistance of the given cell is $2O$. If $4\, A$ of current is flowing between points $P$ and $Q$ in the circuit and then the potential difference between $P$ and $Q$ is

Thermal decomposition of sodium azide gives

The $rms$ value of current in a $50 \,Hz$ $AC$ circuit is $6\,A$. The average value of $AC$ current over a cycle is

The relative ease of dehydration of alcohol is

The reagents used in Clemmensen reduction of aldehyde is/are

The geometry of complex ion $[ {Fe(CN)_6}]^{4-}$ is

The emf of a Daniel cell at 298 K is $E_{1}.\qquad$The cell is $Zn | ZnSO_{4} \left(0.01M\right)|| CuSO_{4} \left(1M\right) | CU$ When the concentration of $ZnSO_{4}$ is changed to 1M and that of $CuSO_{4}$ to 0.01M, the emf changes to E2.The relationship between $E_{1} and E_{2}$ will be

Select the correct statement

Palmau (Betla) National Park is situated in:

Ozone layer block the radiation of wavelength

Origin of first toothed birds and dominance of gymnosperms took place during

One liter of water ( molecular weight $ 18.06 $ ) weighs $ 0.9970 \,kg $ . The degree of ionisation of water is............if $ K_w = 1.10 \times 10^{-14} $ at $ 25^{\circ}C $

Of the following atoms, which one has the highest n/p ratio?

Most animals that live in deep oceanic waters are

Maltose on hydrolysis gives

A string fixed at both ends has a standing wave mode for which the distances between adjacent nodes is $18\, cm$. For the next consecutive standing wave mode distances between adjacent nodes is $16\, cm$. The minimum possible length of the string is

A small bead of mass $M$ slides on a smooth wire that is bent in a circle of radius $R$. It is released at the top of the circular part of the wire (point A in the figure) with a negligibly small velocity. Find the height H where the bead will reverse direction.

A Proton and an alpha particle both are accelerated through the same potential difference. The ratio of corresponding de-Broglie wavelengths is

A particle is moving in translatory motion. If momentum of the particle decreases by $10\%$, kinetic energy will decrease by

Which of the following reactions does not take place? $ {BF3 + F^{-} ->BF4^{-}}$$\quad\quad\quad\quad\quad\quad\quad\quad\ldots\left(I\right)$ $ {BF3 + 3F^{-} ->BF6^{3-}}$$\quad\quad\quad\quad\quad\quad\quad\ldots\left(II\right)$ $ {AlF3 + 3F^{-} ->AlF6^{3-}}$$\quad\quad\quad\quad\quad\quad\ldots\left(III\right)$

Which of the following species is not aromatic?

Which one of the following exhibits positive resonance effect (+R effect)?

Which one of the following is an achiral molecule?