List of practice Questions

A carnot engine having an efficiency of $\frac{1}{10} $ as heat engine, is used as a refrigerator. If the work done on the system is $10\,J$, the amount of energy absorbed from the reservoir at lower temperature is :
Which of the following is a sink for $CO$ ?
A resistance of $ 5 \Omega $ is connected in series with a capacitance of $ 1\,mF $ . The combination is connected to $ AC $ source of angular frequency $ 200 \, rad\, s ^{-1} $ . Then
$ Cu $ crystallizes as face centred cubic lattice with edge length of $ 3.56 \, ? $ . What will be the nearest distance between $ Cu $ atoms?
What is the probable free amino acid product formed when $ R^1CH(NH_2)CONHCHR^2COOH $ reacts with $ 1 $ -fluoro- $ 2,4 $ -dinitrobenzene in presence of $ NaHCO_3 $ followed by acid hydrolysis?
A body $ A $ thrown vertical upwards with a velocity v reaches a height of $ 200\, m $ . Another body $ B $ whose mass is twice that of $ A $ is thrown with a velocity $ 2v $ . Find the maximum height reached by $ B $ .
Which of the following statements is INCORRECT for pair of elements $Zr - Hf$ ?
The metal extracted by leaching with a cyanide is
If coefficient of variation is $60$ and standard deviation is $24$, then Arithmetic mean is

For which combination of working temperatures, the efficiency of Carnot's engine is the least ?

Which of the following represents order of 'Horse' ?
A particle performs linear $S.H.M.$ At a particular instant, velocity of the particle is $u$ and acceleration is $\alpha$ while at another instant velocity is $v$ and acceleration is $ \beta (0 < \alpha < \beta )$. The distance between the two positions is
If $z_1$ and $z_2$ are z co-ordinates of the points of trisection of the segment joining the points $A(2, 1, 4), B _1 + z_2 =$
Which of the following options gives the correct sequence of events during mitosis ?
If $\theta_1$ and $\theta_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by :
Consider the reactions :- Identify $A, X, Y$ and $Z$
Artificial selection to obtain cows yielding higher milk output represents :
DNA replication in bacteria occurs:
Which one is the most acidic compound ?
A particle executes linear simple harmonic motion with an amplitude of $3 \,cm$. When the particle is at $2\,cm$ from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is :
Good vision depends on adequate intake of carotene rich food : Select the best option from the following statements : (a) Vitamin A derivatives are formed from carotene (b) The photopigments are embedded in the membrane discs of the inner segment (c) Retinal is a derivative of Vitamin A (d) Retinal is a light absorbing part of all the visual photopigments
Which of the following reactions is appropriate for converting acetamide to methanamine ?
If $\theta_1$ and $\theta_2$ be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip $\theta$ is given by :
Which one is the correct order of acidity ?
The given electrical network is equivalent to :