List of practice Questions

Which of the following statements is correct? Dielectric constant of $ {{H}_{2}}{{O}_{2}} $
The electronic configuration of a dipositive ion $ {{M}^{2+}} $ is $2, 8, 14$ and its mass number is $56$. The number of neutrons present is
A heavy stone hanging from a massless string of length $15\,m$ is projected horizontally with speed $147 \,m/s$. The speed of the particle at the point where the tension in the string equals the weight of the particle is?
A hypothetical experiment conducted to determine Youngs formula $ Y=\frac{\cos \theta {{T}^{x}}.\tau }{{{l}^{3}}} $ . If Y = Youngs modulus, T = time period, t = Torque and $ l= $ length, then find the value of $ x $ .
The heat of formation of $ C{{O}_{2}} $ is $ -95\text{ }kcal $ . The amount of carbon which on burning will evolve 1000 kcal is
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 statement best explains why A is more acidic than B?
Among the following molecules or ions, which has the longest $ C-N $ bond?
Which of the following compounds can exist in enantiomeric (i.e., D and L) forms?
lodoform test is not answered by:
The most extensively used bacteria in genetic engineering is
Hydrogen peroxide is prepared in the laboratory by:
Which of the following is the correct electronic configuration of $Cr$?
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\, ?$ ?
A radioactive element has half-life period of $600$ yr. After $3000$ yr, what amount will remain?
Beyond which frequency, the ionosphere bends any incident electromagnetic radiation but do not reflect it back towards the earth?
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:
Find the velocity of centre of mass of the system shown in the figure?
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 :
A body of mass $2 \,kg$ is placed on rough horizontal plane. The coefficient of friction between body and plane is $0.2$. Then: