List of practice Questions

The emitter-base junction of a transistor is ............. biased while the collector-base junction is ............. biased.
The element which forms oxides in all oxidation states $+1$ to $+5$ is
The electrostatic force between two charges of $10\,\mu C$ and $20\,\mu C$ at a distance of $2m$ is to be halved. This can be effected by
The direction of Lorentz force can be found by:
The dipole moment is the highest for
The crystal system of a compound with unit cell dimensions $a = 0.387\, nm$, $b = 0.387\, nm$ and $c = 0.504 \,nm$ and $\alpha = \beta = 90^{\circ}$ and $\gamma$ = $120^{\circ}$ is
The correct order of bond angles (smallest first) in $H_2S, NH_3, BF_3$ and $SiH_4$ is
The conjugate base of $H_2PO_4^ -$ is
The compound formed in the positive test for nitrogen with the Lassaigne solution of an organic compound is
The compound formed on heating chlorobenzene with chloral in the presence concentrated sulphuric acid is
The compound having only primary hydrogen atoms is
The classical example of adaptive radiation in development of new species is
The $ BC{{l}_{3}} $ is a planar molecule whereas $ NC{{l}_{3}} $ is pyramidal, because:
The average osmotic pressure of human blood is $7.8$ bar at $37^{\circ}\, C$. What is the concentration of an aqueous $NaCl$ solution that could be used in the blood stream?
Swan neck flask experiment proved:
Ribosomes are made up of
Thomas slag is:
Which of the following Statements, about zero order reaction is not true?
The amount of $ {{\text{H}}_{\text{2}}}\text{S}\text{.} $ required to precipitate $ \text{1}\text{.69 g BaS} $ from $ \text{BaC}{{\text{l}}_{\text{2}}} $ solution is:
Representative elements are
Photosynthetically active radiation (PAR) represents the following range of wave length
Phospholipids are
''The addition of unsymmetrical reagents to unsymmetrical alkenes occurs in such a way that the negative part of the addendum goes to that carbon atom of the double bond which carries lesser number of hydrogen atoms'' is called by :
The molecule of $CO _{2}$ has angle $180^{\circ}$. It can be explained on the basis of :
Which of the following oxides of nitrogen is solid?