List of practice Questions

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
Which aquatic fern performs nitrogen fixation
Anemophily type of pollination is found in
Which statement correct about centre of origin of plant
What is true for plasmid
What is the best pH of the soil for cultivation of plants
Enzyme first used for nitrogen fixation
What is true for cyanobacteria
When water moves through a semi permeable membrane then which of the following pressure develops?
Which pair is wrong
Proteinaceous pigment which control the activities concerned with light