List of practice Questions

Two particles A and B, move with constant velocities $\vec{v_1}$ and $\vec{v_2}$. At the initial moment their position vectors are $\vec{r_1}$, and $\vec{r_2}$ respectively. The condition for particles A and B for their collision is
The angular momentum of electron in 'd' orbtial is equal to
The electric field in a certain region is acting radially outward and is given by E = Ar. A charge contained in a sphere of radius 'a' centred at the origin of the field, will be given by
Permanent hardness in water cannot be cured by :
Which one of the following alkaline earth metal sulphates has its hydration enthalpy greater than its lattice enthalpy?
The Young's modulus of steel is twice that of brass. Two wires of same length and of same area of cross section, one of steel and another of brass are suspended from the same roof. If we want the lower ends of the wires to be at the same level, then the weights added to the steel and brass wires must be in the ratio of
Solubility of the alkaline earth?? metal sulphates in water decreases in the sequence :
The reaction is called :
A technique of micropropagation is
Grafted kidney may be rejected in a patient due to
In an astronomical telescope in normal adjustment a straight black line of length $L$ is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is $I$ . The magnification of the telescope is
What is the mass of the precipitate formed when 50 mL of 16.9% solution of $AgNO_3$ is mixed with 50 mL of 5.8% $NaCl$ solution ? (Ag = 107.8, N = 14, O = 16, Na = 23, Cl =35.5)
Which of the following joints would allow no movements?
DNA is not present in
A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The centre of mass of the rod is at distance a from A. The normal reaction on A is
Which physical property of dihydrogen is wrong ?
Addition of phosphate fertilisers to water bodies causes :
In the long form of the periodic table, the valence shell electronic configuration of $5s^2 5p^4$ corresponds to the element present in :
Two springs of spring constant $1500\, Nm^{ - 1} \, and \, 3000\, Nm ^{-1}$ respectively are stretched with the same force. They will have potential energy in ratio
Flowers are unisexual in
is the floral formula of
Keel is the characteristic feature of flower of
Which one of the following statements is not true?
Which one of the following fruits is parthenocarpic?
The gametophyte is not an independent, free living generation in :