List of practice Questions

Which statement best explains why A is more acidic than B?
Choose the reagent to carry out the reaction. $ C{{H}_{3}}C\equiv CC{{H}_{3}}\xrightarrow[{}]{{}}\underset{cis\text{ }form}{\mathop{C{{H}_{3}}CH=CHC{{H}_{3}}}}\, $
Which of the following would not form upon electrolysis of aqueous solution of potassium propanoate?
Which of the following compounds can exist in enantiomeric (i.e., D and L) forms?
Among the following molecules or ions, which has the longest $ C-N $ bond?
lodoform test is not answered by:
The most extensively used bacteria in genetic engineering is
Which of the following is the correct electronic configuration of $Cr$?
Hydrogen peroxide is prepared in the laboratory by:
A gas has a vapour density $11.2$. The volume occupied by 1 gm of gas at NTP is:
A single slit Fraunhofer diffraction pattern is formed with white light. For what wavelength of light, the third secondary maximum in the diffraction pattern coincides with the second secondary maximum in the pattern for red light of wavelength $ 6500\, ?$ ?
Beyond which frequency, the ionosphere bends any incident electromagnetic radiation but do not reflect it back towards the earth?
A radioactive element has half-life period of $600$ yr. After $3000$ yr, what amount will remain?
A force of $6 \times 10^{6} Nm ^{-2}$ required for breaking a material. The density $\rho$ of the material is $3 \times 10^{3} kg m ^{-3}$. If the wire is to break under its own weight, the length of the wire made of that material should be (take $g=10 \,ms ^{-2}$ )
A force of $10 \,N$ acts on a body of mass $20 \,kg$ for $10$ seconds. The change in its momentum is:
A fighter plane is moving in a vertical circle of radius V. Its minimum velocity at the highest point A of the circle will be
A particle moves with ,a velocity $ (5\hat{i}-3\hat{j}+6\hat{k}) $ m/s under the influence of a constant force $ \vec{F}=10\hat{i}+10\hat{j}+12\hat{k}N. $ The instantaneous power applied to the particle is:
The potential energy of a particle of mass $5 kg$ moving in the $x-y$ plane is given by $U=(-7 x+24 y) J \cdot x \& y$ being in metre. If the particle starts from rest from origin, then speed of particle at $t=2 s$ is :
Find the velocity of centre of mass of the system shown in the figure?
The magnetic force on a point charge is $ \vec{F}=q(\vec{v}\times \vec{B}) $ Here, $ q= $ electric charge $ \vec{v}= $ velocity of point charge $ \vec{B}= $ magnetic field The dimensions of $\vec{B}$ is:
The first diffraction minimum due to single slit diffraction is $ \theta , $ for a light of wave length $ 5000\, ?$ . If the width of the slit is $ 1\times {{10}^{-4}}cm, $ then the value of $ \theta $ is:
A stone of mass $m$ tied to a string of length $l$ is rotated in a circle with the other end of the string as the centre. The speed of the stone is $ \upsilon $ . If the string breaks, the stone will:
A body of mass $2 \,kg$ is placed on rough horizontal plane. The coefficient of friction between body and plane is $0.2$. Then:
When a body moves with constant speed in a circular path, then:
Two stones are projected with same velocity $v$ at an angle $\theta \&(90-\theta) .$ If $H$ and $H_{1}$ are the greatest heights in the two paths, what is the relation between $R, H$ and $H_{1} ?$