A metal foil of negligible thickness is introduced between two plates of a capacitor at the centre.
The new Capacitance of the capacitor would be :

If focal length of a concave lens is 50 cm, then the power of the lens would be

Keeping the voltage of the charging source constant, the separation between the plates of the capacitor is decreased by 10%. The percentage change in the energy stored in the capacitor will be:

In an AC generator, a coil of 20 turns each with area \( 2 \times 10^{-2} \text{ m}^2 \) is rotated at 50 revolutions per sec in a uniform magnetic field of 2.5 T. The maximum induced emf produced is:

The frequencies of a.c. generator depends on :

The extraordinary sparkling of an appropriately cut diamond is due to

A Convex lens having a power of one dioptre is made of glass having refractive index 1.48. What will be the power of convex lens made of material with refractive index 1.6 and same dimension

Two point charges \( q_1 = 36 \text{ }\mu\text{C} \) and \( q_2 = -9 \text{ }\mu\text{C} \) are placed at a distance of 30 cm. The distance from \( q_1 \) where the net electric field is zero, will be :

An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of two wires are in the ratio of 4:3 and 2:3 respectively, the ratio of the currents in the wires will respectively be:

Read the passage carefully and answer the questions
The coordination compounds are of great importance. These compounds are widely present in the mineral, plants and animal world and are known to play many important functions in the area of analytical chemistry, metallurgy, biological systems, industry and medicine. For example, coordination compounds find use in many qualitative and quantitative chemical analysis. Some important metal extraction and purification make use of complex formation. Hardness of water can be estimated by stable complex formation of Ca\(^{2+}\) and Mg\(^{2+}\)
In photography undecomposed AgBr is removed as ___________

The number of moles of potassium dichromate needed to oxidize 3 moles of ferrous ions in acidic medium will be ___________

The projection of the vector \(\vec{a}=2 \hat{i}+3 \hat{j}+2 \hat{k}\) on the vector \(\vec{b}=\hat{i}+2 \hat{j}+\hat{k}\) is:

The seminal plasma is rich in:
(A) Fructose
(B) Amino acids
(C) Calcium
(D) Certain enzymes
Choose the correct answer from the options given below: