List of practice Questions

Phenomenon of organisms resembling others for escaping from enemies is
Minerals absorbed by root move to the leaf through
If $P = (1,0), Q = (-1,0)$ and $R= (2,0)$ are three given points, then locus of the points satisfying the relation $SQ^2 + SR^2 = 2SP^2,$ is
Which of the following is optically inactive?
The first ionisation potential of Na, Mg, Al and Si are in the
Two bodies M and N of equal masses are suspended from two separate massless springs of spring constants kx and k2 respectively. If the two bodies oscillate vertically such that their maximum velocities are equal, the ratio of the one amplitude of vibration of M to that of N is
In which mode of expression, the concentration of a solution remains independent of temperature?
The equivalent weight of MnSO$_4$ is half of its molecular weight, when it converts to
For the reaction , $ CO ( g) + H_2 O ( g) \rightleftharpoons \, CO_2 \, ( g) + H_2 \, ( g ) $ at a given temperature, the equilibrium amount of $CO_2 (g)$ can be increased by
A freshly prepared radioactive source of half-life 2 h emits radiation of intensity which is 64 times the permissible safe level. The minimum time after which it would be possible to work safely with this source is
The velocity of sound in any gas depends upon
According to fluid mosaic model, plasma membrane is composed of
Which one of the following is the true covalent oxide of iodine ?
Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are
The threshold frequency for photoelectric effect on sodium corresponds to a wavelength of $5000\, \mathring{A}.$ Its work function is
The energy of a photon of wavelength $?$ is
Silk thread is obtained from silk moth during
RNA does not possess
Keto-enol tautomerism is observed in
Calorific value is in order
Which one is formed when sodium phenoxide is heated with ethyl iodide?
Which meristem helps in increasing girth?
What is the weight of oxygen required for the complete combustion of 2.8 kg of ethylene?
Lucas reagent is
If formaldehyde and KOH are heated then we get