List of practice Questions

Loading of phloem is related to
A human body required the 0.01 M activity of radioactive substance after 24 h. Half-life of radioactive substance is 6 h. Then, injection of maximum activity of radioactive substance that can be injected will be
During regeneration, modification of an organ to other organ is known as
The beans are cooked earlier in pressure cooker, because
In Negative operon
Which of the following cut the DNA from specific places
Most abundant organic compound on earth is
Due to discovery of which of the following in 1980, the evolution was termed as RNA world
Ratio of complementary genes is
The correct acidic order of following is
Specific volume of cylindrical virus particle is $6.02 \times 10^{-2}$ cc/g, whose radius and length are $7 \mathring{A} \, and \, 10\mathring{A}$ respectively. If $N_A = 6.023 \times 10^{23},$ find molecular weight of virus.
Half life of radioactive element is 12.5 Hour and its quantity is 256 gm. After how much time its quantity will remain 1 gm : -
A particle is thrown vertically upward. Its velocity at half of the height is 10 m/s. Then the maximum height attained by it (g = 10 m/s^2 )
Copper and silicon is cooled from 300 K to 60 K, the specific resistance
If specific resistance of a potentiometer wire is $10^{-7}\, \Omega m$ and current flow through it is 0.1 amp., cross-sectional area of wire is $10^{-6}\, m^2$ then potential gradient will be
With what velocity should a particle be projected so that its height becomes equal to radius of earth?
Which of the following is incorrect : -
obtained by chlorination of n-butane, will be
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
What is true for photolithotrophs?
Which hormone breaks dormancy of potato tuber?
What is B.O.D.
Before the European invader which vegetable was absent in India
Glycolate induces opening of stomata in
Cycas have two cotyledons but not included in angiosperms becuase of