The least distance of distinct vision of a person is 50 cm. He wants to read a book placed at 25 cm. The focal length of the spectacles would be :

A symmetric double convex lens of power 4D is cut in two halves by plane perpendicular to the principal axis. The power of each half is :

Eight charges having values as shown in figure are arranged symmetrically on a circle of radius 10 cm in air. The potential at the centre O is

When a dielectric material placed in uniform electric field, which of the following option is NOT CORRECT:

In the given circuit \( L = \frac{20}{\pi} \text{ H}, R = 2 \text{ k}\Omega \) and \( C = \frac{5}{\pi} \mu F \) are in series across a 220 V, 50 Hz ac source.

The peak voltage drop between A and B is:

The shortest wavelength in the Balmer series of a hydrogen atom is (Given: \(R=1.1 \times 10^7 m^{-1}\) )

The magnetic field lines are completely expelled from a material when ( \(\chi\) is the susceptibility and \(\mu_r\) is relative permeability)

In flowering plants, double fertilization results in the formation of:

Edema is caused by

If \(e^y(x+1)=1\) and \(\frac{d^2 y}{d x^2}=k\left(\frac{d y}{d x}\right)^2\), then \(k\) is equal to

The function \(f : R \rightarrow R\) defined by \(f(x)=\left\{\begin{array}{ll}x^2, & x \geq 1 \\ x, & x<1\end{array}\right.\) is

Read the passage carefully and answer the following questions
Aldehydes, carboxylic acids and ketones are widespread in the animal and plant kingdoms. They play a pivotal role in various biochemical processes of life. Their presence in nature adds fragrance and flavor. These compounds are widely used in food products, pharmaceuticals, paints, resins and other important product industries. These compounds are prepared by various laboratory methods, which mainly include oxidation, formylation, acylation and reduction. Due to the polar nature of the carbonyl group in aldehydes and ketones, they can exhibit different reactions like nucleophilic addition. They do exhibit redox and various condensation reactions which lead to the formation of various important compounds. On the other hand, the carboxylic acids are mainly prepared by oxidation and hydrolysis of different compounds. The carboxylic acid consists of a carbonyl group and the hydroxy group (attached to the carbonyl carbon atom). This makes it possible for the carboxylic acid to participate in various chemical reactions which involve cleavage of the C-OH bond and the O-H bond along with the reactions involving the complete - COOH group.
Identify the incorrect statement for Cannizaro reaction.

The equation of trend line for five years (2004-2008) for the profit of a company is \(y_t=150+8 x\)The predicted profit for the year 2011 is: