List of practice Questions

A heat engine absorbs heat $Q_1$ at temperature $T_1$ and heat $Q_2$ at temperature $T_2$. Work done by the engine is $(Q_1 + Q_2)$. This data
Blood calcium level is a resultant of how much dietary calcium is absorbed, how much calcium is lost in the urine, how much bone dissolves releasing calcium into the blood and how much calcium from blood enters tissues. A number of factors play an important role in these processes. Mark the one which has no role
Estradiol is
Extracellular hormone receptors are
Dihydrosterone is active form of
Exophthalmia or Graves disease is caused by
Secretory activity of digestive glands is checked by
Sex corticoids are secreted by
A halogen atom combines with another non-metal to form a compound with slight metallic lustre. The halogen atom is
A guitar string is $90\, cm$ long and has a fundamental frequency of $124\, Hz$. To produce a fundamental frequency of $186\, Hz$, the guitar should be pressed
A group of fungi with septate mycelium in which sexual reproduction is either unknown or lacking are classified under
A Grignard reagent may be made by reacting magnesium with
A group consists of $4$ girls and $7$ boys. In how many ways can a team of $5$ members be selected if the team has (i) no girls (ii) atleast one boy and one girl (iii) atleast three girls?
A glass is full of water at $4^{\circ}\,C$, when it is (a) cooled (b) heated then, which one of the following is correct
A glass slab of thickness 4 cm contains the same numbers of waves as 5 cm of water when both are traversed by the same monochromatic ray of light. The refractive index of water is 4/3, what is that for glass ?
A girl press her physics text book against a rough vertical wall with her hand. The direction of the frictional force on the book exerted by the wall is
A girl standing on a stationary lift (open from above) throws a ball upwards with initial speed $50 \,m \,s^{-1}$. The time taken by the ball to return to her hands is (Take $g= 10 \,m \,s^{-2}$)
A giant refracting telescope at an observatory has an objective lens of focal length $15\, m$. If an eye piece of focal length $.0 \,cm$ is used, what is the angular magnification of the telescope?
Who among the following was awarded the Nobel Prize for the development of PCR technique ?
A gaseous mixture of three gases A. B and C has a pressure of 10 atm. The total number of moles of all the gases is 10. If the partial pressures of Aand B are 3.0 and 1.0 atm respectively and if C has a mol/wt. of 2.0. What is the weight of C in g present in the mixture ?
The role of DNA ligase in the construction of a recombinant DNA molecule is
Which of the statements is correct in the context of observing DNA separated by agarose gel electrophoresis ?
While isolating DNA from bacteria, which of the following enzymes is not used ?
A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight therefore the ratio of their number of molecules is
A gas $(X)$ is obtained when copper reacts with dilute $HNO_3$. The gas thus formed reacts with oxygen to give brown fumes of $(Y)$. $(Y)$ when dissolved in water gives an important acid $(Z)$ and the gas $(X)$. $X$ , $Y$ and $Z$ respectively are