List of practice Questions

Among the following monosomic aneuploid is:
The de Broglie wavelength of an electron in the first Bohr orbit is
A magnet is dropped down an infinitely long vertical copper tube. Then
Light appears to travel in straight line because
A whistle revolves in a circle with angular speed $\omega= 20 \,rad/sec$ using a string of length 50 cm. If the frequency of sound from the whistle is 385 Hz, then what is the minimum frequency heard by an observer which is far away from the centre :-$\left( V _{\text {sound }}=340 m / s \right)$
A wave travelling in positive X-direction with a = 0.2 mt., velocity = 360 mt/sec. and $\lambda= 60 \,mts, $ then correct expression for the wave is:-
A solid sphere of radius R is placed on smooth horizontal surface. A horizontal force F is applied at height h from the lowest point. For the maximum acceleration of centre of mass, which is correct?
Unit of Stefan's constant is
In the ideal double-slit experiment, when a glass-plate (refractive index 1.5) of thickness t is introduced in the path of one of the interfering beams (wavelength $\lambda$), the intensity at the position where the central maximum occurred previously remains unchanged. The minimum thickness of the glass-plate is
The number of neutrons in the element ${ }_{4} Be ^{9}$ is :
Two plane mirrors are inclined to each other ray of light incident on one face at $ 30{}^\circ $ after reflection from the second retraces the path. What is the angle between the mirrors?
Root germination is inhibited by:
Reason of fast speciation in present day crop plants is:
Insectivorous plants grow where soil deficient in:
Plants growing in acidic soil are termed as:
The genetic material in transduction is:
One end of a copper rod of length 1.0 m and area of cross-section $ {{10}^{-3}}{{m}^{2}} $ is immersed in boiling water and the other end in ice. If the coefficient of thermal conductivity of copper is $ 92\text{ }cal\text{/}m-s\text{ }{}^\circ C $ and the latent heat of ice is $ 8\times {{10}^{4}}cal\text{/}kg, $ then the amount of ice which will melt in one minute is:
A square, whose side is 2 m, has its corners cut away so as to form an octagon with all sides equal. Then the length of each side of the octagon, in metres, is:
This questions choose the word from the alternatives (a), (b), (c) and (d) that is opposite in meaning to the word given in capital letters.
PERTINENT
In this questions, a related pair of words is followed by four pairs of words (a), (b), (c) and (d). Choose the pair that best expressesa relationship similar to that expressed in the given pair.
DOE : STAG
A disc is placed on a surface of pond which has refractive index 5/3. A source of light is placed 4 m below the surface of liquid. The minimum radius of disc needed so that light is not coming out is
The distance between the tops of two trees 20 m and 28 m high is 17 m. The horizontal distance between the two trees is
\(\frac{{3}\pi}{5}\) radians is equal to
If Sin A : Cos A = 4 : 7 , then the value of \(\frac{(7sinA−3cosA)}{(7sinA+2cosA)}\) is 
A tree breaks due to storm and the broken part bends so that the top of the tree first touches the ground, making an angle of 30 with the horizontal. The distance from the foot of the tree to the point where the top touches the ground is 10 m. The height of the tree is