Two identical point charges placed at a distance 'r' apart exert a force F on each other. If each charge is halved and the distance between them is doubled, then the new force acting on each charge would be

A p-type semiconductor can be obtained by adding

A negatively charged object A is repelled by another charged object B. However, an object C is attracted to object B.
Which of the following is the most probable for the charge of object C?

A cell of emf 10 V and the internal resistance 1 \( \Omega \) is being charged by an external supply of 100 V. An external resistance of 8 \( \Omega \) is connected to the charging circuit. The current in the circuit is

Helium gas is filled in a transparent balloon which is kept in air. The balloon behaves as:

Read the following statements carefully and identify the correct statements.
(A) Most interference and diffraction effects exist even for longitudinal waves like sound in air
(B) Optical fibers work on the phenomenon of total internal reflection
(C) Optical density and mass density are the same
(D) Polarisation phenomena are specific to transverse waves like light waves
Choose the correct answer from the options given below:

In a galvanometer, there is a deflection of 10 divisions per mA. The resistance of the galvanometer is \( 60 \Omega \). If a shunt of \( 1 \Omega \) is connected to the galvanometer and there are 100 divisions in all, on the scale of the galvanometer, the maximum current that this galvanometer can read is

Observe the given figures and answer the question

Miller's experiment resulted in the acceptance that the formation of life was
preceded by:

A brown ring is formed in the ring test for \(NO _3^{-}\)ion. It is due to the formation of:

Read the following passage carefully and answer the given questions.
Productivity in the Ecosystem
The flow of energy through a terrestrial ecosystem starts with the harnessing of sunlight by autotrophs. The radiant energy is converted by photosynthesis to organic compounds is known as productivity. The productivity is expressed in units of energy per unit of area per unit time. The amount of organic matter present at any given time is biomass. The productivity of any ecosystem is affected by many parameters like weather conditions, nutrient availability etc. The productivity of any ecosystem does vary seasonally and yearly.
The unit for expressing productivity is -

Identify the incorrect statement about the human genome -

If the area of the triangle with vertices A(x, 4), B(-2, 4) and C(2,-6) is 35 sq units, then the values of 2 are:

The region where the body of the ovule fuses with funicle is known as: