List of practice Questions

Which one of the following isomeric amines has the highest boiling point?
When $H_2$ and $CO$ are reacted in the presence of $Cu$ catalyst, the product/s obtained is/are
In n- p-n transistor, the collector current is 10 mA. If 90% of the electrons emitted reach the collector, then
In a pure inductive AC circuit
A simple pendulum has a time period T in vacuum. Its time period when it is completely immersed in a liquid of density one-eighth of the density of material of the bob is
A car of mass $1500\,kg$ is lifted up a distance of $30\,m$ by crane $A$ in $0.5$ minutes. The second crane $B$ does the same job in 1 minute. The ratio of their power is
Six capacitors each of capacitance of $2 \mu F$ are connected as shown in the figure. The effective capacitance between A and B is
The following figure gives the movement of an object. Select the correct statement from the given choices.
To decrease the volume of a gas by 5% at constant temperature, the pressure should be
The velocity of sound is v at 273 K. The temperature at which it is 2v is
A given resistor has the following colour code of the various strips on it: Brown, black, green and silver. The value of its resistance in ohm is
The rate of forward reaction is two times that of the reverse reaction at a given temperature and identical concentration, K equilibrium is
Sea weeds are an important source of
A mass of $ 6 \,kg $ is suspended by a rope of length $ 2\, m $ from a ceiling. A force of $ 50 \,N $ in the horizontal direction is applied at the mid-point of the rope. The angle made by the rope with the vertical, in equilibrium is
An open organ pipe is closed suddenly with the result that the second overtone of the closed pipe is found to be higher in frequency by $ 100 $ than the first overtone of the original pipe. Then the fundamental frequency of the open pipe is
A particle is moving with constant acceleration from $A$ to $B$ in a straight line $AB$. If $u$ and $v$ are the velocities at $A$ and $B$ respectively then its velocity at the midpoint $C$ will be
A thin circular ring of mass m and radius R is rotating about its axis perpendicular to the plane of the ring with a constant angular velocity $\omega$. Two point particles each of mass M are attached gently to the opposite ends of a diameter of the ring. The ring now rotates with an angular velocity $\omega /2$. Then, the ratio m/M is
Two vessels of volumes $16.4\, L$ and $5\,L$ contain two ideal gases of molecular existence at the respective temperature of $27^?C$ and $227^?C$ and exert $1.5$ and $4.1$ atmospheres respectively. The ratio of the number of molecules of the former to that of the latter is
The major product of the reaction between tert-butyl chloride and sodium ethoxide is
An astronomical telescope has an angular magnification of magnitude $5$ for distant objects. The separation between the objective and the eye-piece is $36 \,cm$ and the final image is formed at infinity. The focal length $ {{f}_{o}} $ of the objective and $ {{f}_{e}} $ of the eye-piece are respectively
Electric charge is uniformly distributed along a long straight wire of radius $1\,mm$. The charge per cm length of the wire is $Q$ coulomb. Another cylindrical surface of radius $50 \,cm$ and length $1\, m$ symmetrically encloses the wire. The total electric flux passing through the cylindrical surface is
For a zero order reaction, the plot of concentration of reactant $vs$ time is (intercept refers to concentration axis)
How many amino acids are present in insulin?
How many molecules of $CO_2$ are formed when one milligram of $100\%$ pure $CaCO_3$ is treated with excess hydrochloric acid?
If a body of mass m has to be taken from the surface of earth to a height $h = R$, then the amount of energy required is ($R$ = radius of earth)