List of practice Questions

Two metallic spheres of radii 1 cm and 3 cm are are given charges of $ -1 \times 10^{-2} C $ and $5 \times 10^{-2} C $ , respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is
The maximum amount of electrolytes and water ($70 - 80$ percent) from the glomerular filtrate is reabsorbed in which part of the nephron?
The dimension of $\left(\mu_{0} \in_{0}\right)^{-1 / 2}$ are :
Ammonia undergoes self-dissociation according to the reaction, $2 NH _{3}(l) \rightleftharpoons NH _{4}^{+}{ }_{(a m)}^{+}+ NH _{2(a m)}^{-}$ where am, stands for ammoniated. When $1$ mole of $NH _{4} Cl$ is dissolved in $1\, kg$ of liquid ammonia, the b. p. at $760$ tour is observed at $-32^{\circ} C$ (Normal b.p. of $N H_{3(l)}$ is $-33.4^{\circ} C$ ). What conclusions are reached about the nature of the solution?
A solid cylinder of mass $3\, kg$ is rolling on a horizontal surface with velocity $4\, ms^{-1}$. It collides with a horizontal spring of force constant $200\, N\, m^{-1}$. The maximum compression produced in the spring will be
Standard enthalpy of vapourisation $\Delta_{\text {vap }} H ^{\Theta}$ for water at $100^{\circ} C$ is $40.66\, kJ\, mol ^{-1}$. The internal energy of vaporisation of water at $100^{\circ} C$ (in $kJmol ^{-1}$) is : (Assume water vapour to behave like an ideal gas)
Which one of the following statements regarding photochemical smog is not correct?
A $200\, W$ sodium street lamp emits yellow light of wavelength $0.6 \, \mu m. $ Assuming it to be $25 \% $ efficient in converting electrical energy to light, the number of photons of yellow light it emits per second is
Common cold differs from pneumonia in that Pneumonia
A car of mass $1000 \,kg$ negotiates a banked curve of radius $90\,m$ on a frictionless road. If the banking angle is $45^{\circ}$, the speed of the car is
Limiting molar conductivity of $NH_4OH $ $[i.e. \,\wedge^\circ {m (NH_4OH)}]$ is equal to
Two similar coils of radius $R$ are lying concentrically with their planes at right angles to each other. The currents flowing in them are $I$ and $2I$, respectively. The resultant magnetic field induction at the centre will be
Placentation in Tomato and lemon is
Gymnosperms are also called soft wood spermatophytes because they lack
Which one of the following is not a gaseous biogeochemical cycle in ecosystem?
How many organisms in the list given below are autotrophs ? Lactobacillus, Nostoc, Chara, Nitrosomonas, Nitrobacter Streptomyces, Saccharomyces, Trypanosoma, Porphyra, Wolffia
Select the correct statement about biodiversity
Cymose inflorescence is present in
Vexillary aestivation is characteristic of the family
The highest number of species in the world is represented by
Which is not a functional unit of an ecosystem
The gynoecium consists of many free pistils in flowers of
Which one of the following pairs is wrongly matched ?
As compared to a dicot root, a monocot root has
How many plants in the list given below belongs to the Fabaceae family? Mustard, Gram, Tulip, Asparagus, Arhar, Sun hemp, Chilli, Colchicine, Onion, Moong, Pea, Tobacco, Lupin, Trifolium, Sesbania